Large-Scale Fabrication of Boron Nitride Nanosheets and Their Utilization in Polymeric Composites with Improved Thermal and Mechanical Properties

Hydrothermal growth of ZnO nanostructures

ZnO nanowires (or nanorods) have been widely studied due to their unique material properties and remarkable performance in electronics, optics, and photonics. Recently, photocatalytic applications of ZnO nanowires are of increased interest in environmental protection applications. This paper presents a review of the current research of ZnO nanowires (or nanorods) with special focus on photocatalysis. We have reviewed the semiconducting photocatalysts and discussed a variety of synthesis methods of ZnO nanowires and their corresponding effectiveness in photocatalysis. We have also presented the characterization of ZnO nanowires from the literature and from our own measurements. Finally, a wide range of uses of ZnO nanowires in various applications is highlighted in this paper.

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Synthesis, characterization, and applications of ZnO nanowires

Effects of Ag doping on the crystallinity and optical properties of zinc oxide (ZnO) nanoparticles have been studied by x-ray diffraction, diffuse reflectance spectroscopy, micro-Raman, and photoluminescence spectroscopy. It has been observed that while Ag-doping at low concentration improves the optoelectronic properties of ZnO nanostructures, Ag-doping at high concentrations drastically modify the emission behavior and lattice vibrational characteristics of the nanostructures. High Ag content in ZnO nanostructures causes lattice deformation, induces silent vibrational modes in Raman spectra, and reduces excitonic UV emission due to concentration quenching.

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Photoluminescence and Raman Scattering in Ag-doped ZnO Nanoparticles

Organophosphates are one of the major constituent of herbicides, pesticides, insecticides and nerve gas. Azinophos-methyl, chlorpyrifos, diazinon, fonofos and disulfoton are well-known organophosph...

Toxicity, monitoring and biodegradation of organophosphate pesticides: A review

Resumen en: Optical properties of un-supported or powdered nanostructures are frequently determined through UV-Vis absorption spectroscopy of their dispersed solutio...

Use of diffuse reflectance spectroscopy for optical characterization of un-supported nanostructures

http://www.ifuap.buap.mx/~upal/assets/105.pdf

Indium doping in nanostructured ZnO through low-temperature hydrothermal process

Design and characterization of the structural, electronic, and magnetic properties of armchair boron-nitride, BN (B27N27H18), nanosheets were performed by means of density functional theory all-electron calculations. The HSEh1PBE-GGA method together with 6-31G(d) basis sets were used. Non-stoichiometric B30N24H18 and B24N30H18 compositions: rich in boron or nitrogen atoms, forming homonuclear B or N bonds, respectively, were chosen. The obtained results reveal that these BN nanosheets reach structural stability in the anionic form, where semiconductor and magnetic behaviors are promoted. Effectively, the HOMO-LUMO gap is of 2.03 and 2.39eV, respectively and the magnetic moments are of 1.0 magneton bohrs, coming from the boron atoms in both systems. The rich in boron nanosheets present high-polarity, either in the gas phase or embedded in aqueous mediums like water, as well as low chemical reactivity, signifying potential applicability in the transportation of pharmaceutical species in biological mediums. These systems are also promising for the design of electronic devices, because they possess low-work functions, mainly arising from the homonuclear boron or nitrogen bond formation.

Design of the magnetic homonuclear bonds boron nitride nanosheets using DFT methods

The characterization of the structural, electronic, and magnetic properties of octagraphene-like boron-nitride: BN (B32N32H24, B37N27H24, and B27N37H24), nanosheets were performed by means of densi...

Stability, electronic and magnetic properties of the Octagraphene-like boron nitride Nanosheets: In silico studies

Photoluminescence (PL) emission and excitation (EPL) spectra of un-doped and indium (1%) doped 1D zinc oxide nanostructures are studied at different temperatures. The nanostructures reveal a blue emission band attributed to localized donor states. Indium doping enhances the blue emission. While at low temperatures ( 100 K), defect related emissions in the visible range dominate over the excitonic emission. Temperature dependence measurements on the doped sample reveal that (D(0),X) emission energies obey the Varshni's formula with fitting constants alpha = 8.4 +/- 0.3 x 10(-4) eV/K and beta = 650 +/- 40 K. The (D(0),X) emission intensity decays exponentially with temperature.

http://www.ifuap.buap.mx/~upal/assets/131.pdf

A. Escobedo Morales

Papers

Use of diffuse reflectance spectroscopy for optical characterization of un-supported nanostructures

Indium doping in nanostructured ZnO through low-temperature hydrothermal process

Design of the magnetic homonuclear bonds boron nitride nanosheets using DFT methods

Stability, electronic and magnetic properties of the Octagraphene-like boron nitride Nanosheets: In silico studies

Low temperature photoluminescence characteristics of chemically synthesized indium doped zinc oxide nanostructures.