Showing papers on "Transmission electron microscopy published in 2008"
TL;DR: The shape and size distribution of crystalline nanoparticles resulting from the sulfuric acid hydrolysis of cellulose from cotton, Avicel, and tunicate were investigated using transmission electron microscopy and atomic force microscopy as well as small- and wide-angle X-ray scattering.
1,050 citations
TL;DR: In this article, the synthesis of very thin sheets (between a few and ten atomic layers) of hexagonal boron nitride (h-BN), prepared either on a SiO2 substrate or freely suspended, is described.
Abstract: We describe the synthesis of very thin sheets (between a few and ten atomic layers) of hexagonal boron nitride (h-BN), prepared either on a SiO2 substrate or freely suspended. Optical microscopy, atomic force microscopy, and transmission electron microscopy have been used to characterize the morphology of the samples and to distinguish between regions of different thicknesses. Comparison is made to previous studies on single- and few-layer graphene. This synthesis opens the door to experimentally accessing the two-dimensional phase of boron nitride.
909 citations
TL;DR: TEM analysis of a high-surfactant-concentration sample enables us to construct a plausible mechanism for decrease in CNT dispersion at high surfactant concentration, consistent with the UV-vis observations.
657 citations
TL;DR: On a clean single-layer graphene membrane, adsorbates such as atomic hydrogen and carbon can be seen as if they were suspended in free space, and directly image such individual adatoms, along with carbon chains and vacancies, and investigate their dynamics in real time, opening a way to reveal dynamics of more complex chemical reactions or identify the atomic-scale structure of unknown adsorbate.
Abstract: Scanning tunnelling microscopes made it possible to image atomic-scale features on a solid-state surface. But they have limitations in terms of sample conductivity, cleanliness and data acquisition rate. An older technology, the transmission electron microscope (TEM), meanwhile evolved to be able to image individual heavy atoms. But lighter atoms remained beyond its range because of their low contrast. Enter graphene, the one-atom-thick sheet of carbon atoms packed in a dense two-dimensional honeycomb lattice. Meyer et al. show that atoms as small as carbon and even hydrogen adsorbed onto graphene can be imaged using standard TEM technology. Ultrathin graphene is an ideal support, either invisible or, if the lattice is resolved at high resolution, its contribution to the imaging signal is easily removed. This approach brings atomic resolution to biomolecules as well as to graphene itself. The cover shows hydrogen atoms (purple) on a graphene sheet (red), with a carbon atom (yellow tipped) near left centre. Yellow peaks are amorphous carbon. Detecting individual low-atomic-number atoms is extremely challenging using conventional transmission electron microscopy. This paper reports the direct imaging in a transmission electron microscope (TEM) of atomic carbon and hydrogen using graphene as a substrate which provides a near-invisible background. The approach could be used for the direct study at the atomic level of organic species such as biomolecules. Observing the individual building blocks of matter is one of the primary goals of microscopy. The invention of the scanning tunnelling microscope1 revolutionized experimental surface science in that atomic-scale features on a solid-state surface could finally be readily imaged. However, scanning tunnelling microscopy has limited applicability due to restrictions in, for example, sample conductivity, cleanliness, and data acquisition rate. An older microscopy technique, that of transmission electron microscopy (TEM)2,3, has benefited tremendously in recent years from subtle instrumentation advances, and individual heavy (high-atomic-number) atoms can now be detected by TEM4,5,6,7 even when embedded within a semiconductor material8,9. But detecting an individual low-atomic-number atom, for example carbon or even hydrogen, is still extremely challenging, if not impossible, via conventional TEM owing to the very low contrast of light elements2,3,10,11,12. Here we demonstrate a means to observe, by conventional TEM, even the smallest atoms and molecules: on a clean single-layer graphene membrane, adsorbates such as atomic hydrogen and carbon can be seen as if they were suspended in free space. We directly image such individual adatoms, along with carbon chains and vacancies, and investigate their dynamics in real time. These techniques open a way to reveal dynamics of more complex chemical reactions or identify the atomic-scale structure of unknown adsorbates. In addition, the study of atomic-scale defects in graphene may provide insights for nanoelectronic applications of this interesting material.
502 citations
01 Jan 2008
TL;DR: In this article, the commercial TiO2 nanopowder and micropowder of anatase phase and rutile phase have been characterized by x-ray diffraction and transmission electron microscopy (TEM).
Abstract: In this study, the commercial TiO2 nanopowder and micropowder of anatase phase and rutile phase have been characterized by x-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD patterns of nano-TiO2 in rutile and anatase phases exhibit broad peaks whereas both phases of micro-TiO2 demonstrate very sharp peaks. TEM images show that the grain size of TiO2 micropowders and TiO2 nanopowders are 0.3-0.7 ∝m and 10 nm, respectively. The selected-area electron diffraction patterns of TiO2 nanopowders in rutile and anatase phases are consistent with XRD results.
390 citations
TL;DR: To integrate vertical InAs nanowires on Si by modifying initial Si(111) surface in selective-area metal-organic vapor phase epitaxy with flow-rate modulation mode at low temperature is achieved.
Abstract: We report on control of growth directions of InAs nanowires on Si substrate. We achieved to integrate vertical InAs nanowires on Si by modifying initial Si(111) surface in selective-area metal-organic vapor phase epitaxy with flow-rate modulation mode at low temperature. Cross-sectional transmission electron microscope and Raman scattering showed that misfit dislocation with local strains were accommodated in the interface.
347 citations
TL;DR: In this paper, the authors used a transmission electron microscope (TEM) for both imaging and chemical analysis, and measured ~8000 particles (25 samples) with aerodynamic diameters from 0.05 to 0.3 μm.
Abstract: Soot particles, which are aggregated carbonaceous spherules with graphitic structures, are major aerosol constituents that result from burning of fossil fuel, biofuel, and biomass. Their properties commonly change through reaction with other particles or gases, resulting in complex internal mixtures. Using a transmission electron microscope (TEM) for both imaging and chemical analysis, we measured ~8000 particles (25 samples) with aerodynamic diameters from 0.05 to 0.3 μm that were collected in March 2006 from aircraft over Mexico City (MC) and adjacent areas. Most particles are coated, consist of aggregates, or both. For example, almost all analyzed particles contain S and 70% also contain K, suggesting coagulation and condensation of sulfates and particles derived from biomass and biofuel burning. In the MC plumes, over half of all particles contained soot coated by organic matter and sulfates. The median value of the soot volume fraction in such coated particles is about 15%. In contrast to the assumptions used in many climate models, the soot particles did not become compact even when coated. Moreover, about 80% by volume of the particles consisting of organic matter with sulfate also contained soot, indicating the important role of soot in the formation of secondary aerosol particles. Coatings on soot particles can amplify their light absorption, and coagulation with sulfates changes their hygroscopic properties, resulting in shorter lifetimes. Through changes in their optical and hygroscopic properties, internally mixed soot particles have a greater effect on the regional climate of MC than uncoated soot particles.
288 citations
TL;DR: In this article, the structure of magnetic powders were characterized by X-ray diffraction diffractometer (XRD), field emission scanning electron microscopy (FE-SEM), TEM, thermal gravity analysis (TGA) and differential thermal analysis (DTA) analysis, XPS, and Fourier transform infrared spectra (FTIR) techniques.
263 citations
TL;DR: A novel method was developed for preparing high specific surface area one-dimensional TiO(2) nanostructures co-doped with C, N and S by the nano-confinement effect, and results indicated that the anatase nanowires grew along the [101] direction.
Abstract: A novel method was developed for preparing high specific surface area (156.2 m2 g−1) one-dimensional TiO2 nanostructures co-doped with C, N and S by the nano-confinement effect. A nonmetal doping source (thiourea) was first intercalated into the inner space of H-titanate nanotubes prepared by the hydrothermal method, and then calcined at 450 °C for 2 h in air. The as-prepared C, N and S co-doped TiO2 nanowires exhibited high visible light and enhanced UV–vis activities in photocatalytic degradation of toluene in the gas phase. The samples were characterized by x-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, fast Fourier transform analysis, x-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectra and photoluminescence. The results indicated that the anatase nanowires grew along the [101] direction. Doping TiO2 nanowires with C, N and S could not only broaden the light adsorption spectra into the visible region (400–600 nm), but also inhibit the recombination of photo-induced carriers. A mechanism is proposed to elucidate the nano-confinement effect of H-titanate nanotubes in the formation of C, N and S co-doping. Based on this mechanism, the effect of C, N and S co-doping on the band structure of TiO2 nanowires is also discussed.
257 citations
TL;DR: The magnetite (Fe3O4) nanoparticles (MNPs) coated with PEG diacid via covalent bonds were prepared for magnetic resonance imaging (MRI).
251 citations
TL;DR: In this paper, the flux pinning properties of BaZrO3-doped YBa2Cu3O7−x and BaSnO3doped yBa2C3O 7−x films were studied.
Abstract: We studied the flux pinning properties of BaZrO3-doped YBa2Cu3O7−x and BaSnO3-doped YBa2Cu3O7−x films. We found that BaSnO3-doped films showed very high global pinning forces, Fp, of 28.3 GN m−3 (77 K, ) and 103 GN m−3 (65 K, ), twice that of BaZrO3-doped films. Transmission electron microscopy analysis showed that, in both films, nanorods of the dopant phase were incorporated. The BaSnO3 nanorods were nearly straight but the BaZrO3 nanorods became curved with the increasing film thickness.
TL;DR: In this paper, single-crystal tetragonal α-MnO2 nanotubes have been successfully synthesized by a facile hydrothermal treatment of KMnO4 in the hydrochloric acid solution.
Abstract: Single-crystal tetragonal α-MnO2 nanotubes have been successfully synthesized by a facile hydrothermal treatment of KMnO4 in the hydrochloric acid solution. The sample has been characterized by X-ray powder diffraction, field emission scanning electron microscopy, transmission electron microscopy, and orientation dependent Raman spectroscopy, which indicates the nanotubes have high-quality crystalline and shape-dependent optical properties. The morphology evolution of the sample reveals that the nanotubes are formed via the solid nanorod by a chemical etching process.
TL;DR: A series of Zn1−xMgxO samples with dopant content ranging from x = 0 to 0.10 were prepared by a novel rheological phase reaction route as discussed by the authors.
Abstract: A series of Zn1−xMgxO samples with dopant content ranging from x = 0 to 0.10 were prepared by a novel rheological phase reaction route. All Zn1−xMgxO samples were investigated by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, inductive coupled plasma optical emission spectroscopy, infrared and UV−vis absorption spectroscopy, and the Barrett−Emmett−-Teller technique. The effects of Mg2+ doping in ZnO on the electronic structures and photogradation of methylene blue dye solution were investigated experimentally and theoretically. All Zn1−xMgxO samples exhibit high photoactivities comparable to Degussa P-25, which first increased with the Mg doing content up to x = 0.05, and then slightly decreased with further doping of Mg to x = 0.10. Density function theory calculations revealed that the substitutions of Mg for Zn ions in the wurtzite ZnO structure largely affected the conduction band, but left the valence band nearly unchanged. The bottom of the conduction band shifted...
TL;DR: In this paper, a combination of sol−gel process and electrospinning was used to combine one-dimensional YVO4:Ln and quasi-one-dimensional VO4-Ln nanofibers.
Abstract: One-dimensional YVO4:Ln and Y(V, P)O4:Ln nanofibers and quasi-one-dimensional YVO4:Ln microbelts (Ln = Eu3+, Sm3+, Dy3+) have been prepared by a combination method of sol−gel process and electrospinning. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric and differential thermal analysis (TG−DTA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL), low-voltage cathodoluminescence (CL), and time-resolved emission spectra as well as kinetic decays were used to characterize the resulting samples. Due to an efficient energy transfer from vanadate groups to dopants, YVO4:Ln phosphors showed their strong characteristic emission under ultraviolet excitation (280 nm) and low-voltage electron beam excitation (1−3 kV). The energy transfer process was further studied by the time-resolved emission spectra as well as kinetic decay curves of Eu3+ upon excitation into the VO4...
TL;DR: In this article, X-ray diffraction (XRD) analysis revealed broad pattern for fcc crystal structure of copper metal and particle size by use of Debye-Scherrer's equation was calculated to be about 40nm.
TL;DR: Simulation of the diffraction patterns, employing the structural factors of graphene, confirms the existence of AA graphite and creates a new graphite crystal structure containing AA(') graphene layers.
Abstract: Stacked AA graphite has been synthesized using a high-density dc plasma in hydrogen-methane mixtures. Graphene layers have been grown epitaxially with 2-1 registration between the AA graphitic edges and the (111) surface of diamond. In addition, a new graphite crystal structure containing AA′ graphene layers, where alternate planes are translated by half the hexagon width, is formed by 1-1 registry. The resulting interplanar distances of the AA graphite at the interface range from 2.20A for the 1-1 registration to 4.40A for the 2-1 registration and have been measured directly by high-resolution transmission electron microscopy (TEM). The appearance of the characteristic d-spacings, 3.55, 2.15, 1.80, 1.75 (not fully resolved), and 1.25A in the selective area diffraction patterns from the TEM, are consistent with reflections from the (001), (100), (102), (002), and (110) planes of the AA graphite. Simulation of the diffraction patterns, employing the structural factors of graphene, confirms the existence of...
TL;DR: In this article, an amorphous MnO 2 was synthesized at ambient condition by reduction of potassium permanganate with aniline and the as-prepared MnO2 contained particles of 5-10 nm diameter, which attained crystalline α-phase with a concomitant change in morphology.
Abstract: Nanostructured MnO 2 was synthesized at ambient condition by reduction of potassium permanganate with aniline. Powder X-ray diffraction, thermal analysis (thermogravimetric and differential thermal analysis), Brunauer-Emmett-Teller surface area, and infrared spectroscopy studies were carried out for physical and chemical characterization. The as-prepared MnO 2 was amorphous and contained particles of 5-10 nm diameter. Upon annealing at temperatures >400°C, the amorphous MnO 2 attained crystalline α-phase with a concomitant change in morphology. A gradual conversion of nanoparticles to nanorods is evident from scanning electron microscopy and transmission electron microscopy (TEM) studies. High-resolution TEM images suggested that nanoparticles and nanorods grow in different crystallographic planes. Capacitance behavior was studied by cyclic voltammetry and galvanostatic charge-discharge cycling in a potential range from -0.2 to 1.0 V vs SCE in 0.1 M sodium sulfate solution. Specific capacitance of about 250 F g -1 was obtained at a current density of 0.5 mA cm -2 (0.8 A g -1 ).
TL;DR: In this article, the authors provided evidence of polymer transcrystallinity in the presence of carbon nanotubes (CNTs) by means of polarized optical microscopy, wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and transmission electron microscope (TEM).
TL;DR: In this paper, the core-shell SDC (Ce0.8Sm0.2O1.9)/amorphous Na2CO3 nanocomposite was prepared for the first time.
TL;DR: Using a homogeneous precipitation method in an ultrasound field, this paper synthesized nanosized, plate-like hydroxyapatite (HAp), which consists of specifically oriented and laterally connected nanorods.
Abstract: Using a homogeneous precipitation method in an ultrasound field, we synthesized nanosized, platelike hydroxyapatite (HAp). The internal structure of these platelike formations consists of specifically oriented and laterally connected nanorods. The synthesized HAp nanorods have a length of about 500 nm and a diameter of about 100 nm. A closer inspection of the microstructure of a single nanorod revealed a highly regular and defect-free lattice with unique crystallographic plane orientations. The obtained structure was related to the influence of the ultrasound on the growth mechanism. The samples were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).
TL;DR: The alloy nanoparticles with widely varying Co/Fe ratio are kept as active as Co for the H 2 production from NH 3 decomposition and the stability of Co was significantly improved by alloying with Fe.
Abstract: We report the synthesis, characterization, and catalytic performance of Fe−Co alloy nanoparticles inside the tubular channel of carbon nanotubes. The homogeneous distributions of Fe and Co in the isolated nanoparticles were evidenced confidentially by bulk and surface structural and compositional characterizations, that is, scanning electron microscopy, high-resolution transmission electron microscope in combination with elemental mapping by energy dispersive X-ray spectroscopy and electron energy-loss spectroscopy, powder X-ray diffraction, and X-ray photoelectron spectroscopy. We also demonstrate for the first time an unusual synergism in alloy catalysis. The alloy nanoparticles with widely varying Co/Fe ratio are kept as active as Co for the H2 production from NH3 decomposition. The stability of Co was significantly improved by alloying with Fe. We expect our experimental method to be a general approach to elucidate the synergism phenomenon in alloy catalysis.
TL;DR: In this article, a facile synthetic route of cobalt ferrite nanocrystals with narrow size distribution was reported, which involved a very rapid mixing of reducible metal cations with sodium borohydride and simultaneous reduction in a colloid mill, which was followed by a slow oxidation in a separate hydrothermal treatment.
Abstract: In this paper, a facile synthetic route of cobalt ferrite nanocrystals with narrow size distribution was reported. The key feature of this method involved a very rapid mixing of reducible metal cations with sodium borohydride and simultaneous reduction in a colloid mill, which is followed by a slow oxidation in a separate hydrothermal treatment. The microstructural and magnetic characteristics of the materials were characterized by powder X-ray diffraction (XRD), chemical analysis, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), Mossbauer spectroscopy, and magnetometry. The results unambiguously indicated that the obtained products consisted of CoFe2O4 nanocrystals with good monodispersity and high stoichiometry and that, especially, a 9 nm sample exhibited room-temperature superparamagnetism. The formation mechanism of nanocrystals was proposed. It is believed that the extreme forces, to which ...
TL;DR: In this paper, two-dimensional (2D) single-crystalline bismuth oxyhalides (BiOX, X = Cl, Br) micro-and nanostructures, such as nanoplates, nanosheets, and microsheets, were synthesized in a large scale by a simple wet chemistry approach of hydrogen peroxide (H2O2) direct oxidation of bulk metal Bismuth (Bi) particles in a mixed solution followed by a hydrothermal treatment.
Abstract: In this article, for the first time, two-dimensional (2D) single-crystalline bismuth oxyhalides (BiOX, X = Cl, Br) micro- and nanostructures, such as nanoplates, nanosheets, and microsheets, were synthesized in a large scale by a simple wet chemistry approach of hydrogen peroxide (H2O2) direct oxidation of bulk metal bismuth (Bi) particles in a mixed solution followed by a hydrothermal treatment, instead of previous coprecipitation of Bi salts route. The in-plane size and thickness of the 2D products can be conveniently tailored by varying the temperature and the concentrations of the Bi precursor. The products were characterized by a range of methods, such as X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission microscopy, energy-dispersive X-ray spectroscopy, selected area electron diffraction, thermogravimetric analysis, Fourier transform infrared spectra, and UV−vis diffuse reflectance spectra. The BiOBr nanoplates, nanosheets, and micr...
TL;DR: Selective targeting of the DC-SPIONs to KB cancer cells in vitro was demonstrated and quantified using two distinct and complementary imaging modalities: UV-visible and X-ray fluorescence; confocal microscopy confirmed internalization.
Abstract: Organic-coated superparamagnetic iron oxide nanoparticles (OC-SPIONs) were synthesized and characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. OC-SPIONs were transferred from organic media into water using poly(amidoamine) dendrimers modified with 6-TAMRA fluorescent dye and folic acid molecules. The saturation magnetization of the resulting dendrimer-coated SPIONs (DC-SPIONs) was determined, using a superconducting quantum interference device, to be 60 emu/g Fe versus 90 emu/g Fe for bulk magnetite. Selective targeting of the DC-SPIONs to KB cancer cells in vitro was demonstrated and quantified using two distinct and complementary imaging modalities: UV–visible and X-ray fluorescence; confocal microscopy confirmed internalization. The results were consistent between the uptake distribution quantified by flow cytometry using 6-TAMRA UV–visible fluorescence intensity and the cellular iron content determined using X-ray fluorescence microscopy.
TL;DR: In this article, an alkali precipitation method was used to synthesize zinc oxide (ZnO) and aluminium doped ZnO nanoparticles with grain size in the nanometer range.
TL;DR: In this article, a one-dimensional hybrid nanostructure was designed by introducing small amounts of Au species (0.9 wt %) dispersed over the amorphous tin oxide overlayers uniformly supported on coaxial carbon nanotubes as electrode materials for application in lithium ion battery.
Abstract: By using a facile one-pot synthetic route, we designed a one-dimensional hybrid nanostructure by introducing small amounts of Au species (0.9 wt %) dispersed over the amorphous tin oxide overlayers uniformly supported on coaxial carbon nanotubes as electrode materials for application in lithium ion battery. The as-synthesized CNT@SnO2−Au nanocables were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping, and X-ray photoelectron spectroscopy; such hybrid nanostructure markedly improves electrode performance, especially for the rate performance. The capacities of 467 and 392 mA h g−1 were obtained at rates of 3.6 A g−1 and 7.2 A g−1, respectively.
TL;DR: The porous ZnIn2S4 product showed an enhancing visible-light photocatalytic activity for methyl orange degradation and may have potential applications in solar energy conversion, environmental remediation, and advanced optical/electric nanodevices.
Abstract: Porous ZnIn2S4 microspheres have been successfully synthesized by means of a facile thermal solution method at 353 K. This method was a simple route that involved low temperature, no templates, no catalysts, no surfactants, or organic solvents. Scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, nitrogen sorption analysis, and a UV-vis spectrophotometer were used to characterize the products. The results demonstrated that the microspheres, which were composed of many ZnIn2S4 single crystal nanosheets, underwent the Oswald ripening and self-assembly processes. A morphology formation mechanism has been proposed and discussed. The porous ZnIn2S4 product showed an enhancing visible-light photocatalytic activity for methyl orange degradation. The as-grown architectures may have potential applications in solar energy conversion, environmental remediation, and advanced optical/electric nanodevices.
TL;DR: In this paper, the microstructural evolution of atomised U-7-wt%Mo alloy fuel under irradiation was investigated by transmission electron microscopy on material from the experimental fuel plates used in the FUTURE irradiation.
TL;DR: In this article, the structural and chemical stability of the as-deposited oxide nanocrystals were investigated using wavelength dispersive spectroscopy (WDS), X-ray photoelectron spectroscope (XPS), and transmission electron microscopy (TEM).
Abstract: Mn−Co−O nanocrystals, with a defective rock salt-type structure, were prepared by anodic electrodeposition. The structural and chemical stability of the as-deposited oxide nanocrystals were investigated using wavelength dispersive spectroscopy (WDS), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The rock salt−spinel structural transformation occurred in the oxide nanocrystals annealed at a temperature of 500 °C. A cubic Fd3m spinel-type structure was obtained in the Co-rich, Mn−Co−O oxide nanocrystals, while a distorted tetragonal-type spinel phase with a space group of I41/amd, induced by the Jahn–Teller effect, formed in their Mn-rich counterparts. It is noted that the structural transformation involves the migration of Mn/Co cations from the octahedral interstices to the tetrahedral interstices, which is accompanied by the reduction of Mn/Co cations and oxygen evolution. A novel mechanism for the structural transformation and reaction scheme is proposed in this work.
TL;DR: In this article, the formation mechanism of the flower-like CuO was proposed and explained, and the chemiluminescence (CL) and catalysis properties of the plant-like nanostructures were also investigated.
Abstract: The flower-like CuO nanostructures were hydrothermally synthesized without using any template. The influences of hydrothermal temperature and time on the growth of nanostructures were investigated. The samples were characterized by means of scanning electron microscope (SEM), X-ray powder diffraction (XRD), transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), selected area electron diffraction (ED), and N2 adsorption isotherm. Interestingly, these architectures are made of three-order structures. The formation mechanism of the flower-like CuO was proposed and explained. Furthermore, the chemiluminescence (CL) and catalysis properties of the flower-like CuO were also investigated. The flower-like nanostructures showed the high-CL intensities and reactive activities for CO oxidation. The flower-like CuO can be used to fabricate a highly sensitive CL detector. This CL mode is a rapid and effective method for the selection of new catalysts from thousands of materials.