Journal ArticleDOI
Optical properties of well-crystallized and size-tuned ZnO quantum dots
Keigo Suzuki,Hiroyuki Kondo,Masashi Inoguchi,Nobuhiko Tanaka,Keisuke Kageyama,Hiroshi Takagi +5 more
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TLDR
In this article, a well-crystallized and size-tuned ZnO quantum dots (QDs) were prepared by pulsed laser ablation and following size classification using a differential mobility analyzer.Abstract:
Well-crystallized and size-tuned ZnO quantum dots (QDs) were prepared by pulsed laser ablation and following size classification using a differential mobility analyzer. Photoluminescence (PL) spectra of the ZnO QDs showed predominant ultraviolet (UV) emission. The finely size-tuned ZnO QDs allowed us to precisely evaluate the quantum confinement effect, i.e., the size-driven color-tunable behavior in the UV emission range. The faint green luminescence found in the PL spectra and the low Stokes shifts of several tens meV demonstrated that the present QDs are almost free from defects. These features are quite favorable for use in future optoelectronic devices.read more
Citations
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Planar-defect-rich zinc oxide nanoparticles assembled on carbon nanotube films as ultraviolet emitters and photocatalysts
TL;DR: A rapid and low-temperature deposition method to fabricate planar-defect-rich ZnO nanoparticles on freestanding and aligned carbon nanotube films, different from common treatments which remove structural defects as many as possible.
Journal ArticleDOI
Construction of a direct Z-scheme ZnS quantum dot (QD)-Fe2O3 QD heterojunction/reduced graphene oxide nanocomposite with enhanced photocatalytic activity
Qianyu Liu,Qianyu Liu,Jian Cao,Yuan Ji,Xin Li,Weijun Li,Yukun Zhu,Xiaoyan Liu,Junzhi Li,Jinghai Yang,Yang Yang +10 more
TL;DR: In this article, a direct Z-scheme ZnS quantum dot (QD)-Fe2O3 QD heterojunction/reduced graphene oxide (rGO) (GZxFy) nanocomposite was successfully synthesized by a simple hydrothermal method.
Journal ArticleDOI
Fabrication of single crystalline WO3 nano-belts based photoelectric gas sensor for detection of high concentration ethanol gas at room temperature
Hua-Liang Yu,Jun Wang,Biao Zheng,Bingwen Zhang,Li-Qin Liu,Ying-Wu Zhou,Cheng Zhang,Xiao-Ling Xue +7 more
TL;DR: WO3 nano-particles (NBs) have been used to detect high concentration of C2H5OH at room temperature by comparing and analysing the UV-vis absorption spectra.
Journal ArticleDOI
Zinc oxide micro- and nanoparticles: Synthesis, structure and optical properties
TL;DR: In this paper, the formation of ZnO with hexagonal wurtzite phase on the hexagonal Zn substrate with growth of the znO microparticles along the [1 − 0 − 1] direction.
Journal ArticleDOI
Ultraviolet photoluminescence of ZnO quantum dots sputtered at room-temperature
Gillian Kiliani,Reinhard Schneider,Dimitri Litvinov,Dagmar Gerthsen,Mikhail Fonin,Ulrich Rüdiger,Alfred Leitenstorfer,Rudolf Bratschitsch +7 more
TL;DR: This work paves the way for cheap nanooptical devices in the ultraviolet which are fabricated in a single sputtering run and shows a shift of ultraviolet emission and absorption of the dots compared to bulk ZnO material.
References
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Journal ArticleDOI
Mechanisms behind green photoluminescence in ZnO phosphor powders
Karel Vanheusden,William L. Warren,Carleton H. Seager,David R. Tallant,J. A. Voigt,Bruce E. Gnade +5 more
TL;DR: In this article, the authors explore the interrelationships between the green 510 nm emission, the free-carrier concentration, and the paramagnetic oxygen vacancy density in commercial ZnO phosphors by combining photoluminescence, optical absorption, and electron paramagnetic resonance spectroscopies.
Journal ArticleDOI
Highly monodisperse polymer-capped ZnO nanoparticles: Preparation and optical properties
TL;DR: In this article, the authors reported the preparation of highly monodisperse ZnO nanoparticles using poly(vinyl pyrrolidone) (PVP) as the capping molecules.
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Behind the weak excitonic emission of ZnO quantum dots: ZnO/Zn(OH)2 core-shell structure
Huijuan Zhou,H. Alves,Detlev M. Hofmann,W. Kriegseis,Bruno K. Meyer,G. Kaczmarczyk,Axel Hoffmann +6 more
TL;DR: The structure of ZnO quantum dots prepared via the wet chemical method was studied in this article, and the effect of the change in the structure of the dots on their luminescence properties was investigated.
Journal ArticleDOI
Spectroscopic and structural characterization of electrochemically grown ZnO quantum dots
TL;DR: In this article, a method for the synthesis of stable, OH free zinc oxide quantum dots, using an electrochemical route, was reported, and the optical properties of these quantum dots were studied at room temperature, by taking the optical absorption and luminescence spectra.
Journal ArticleDOI
Monolithic multichannel ultraviolet detector arrays and continuous phase evolution in MgxZn1−xO composition spreads
Ichiro Takeuchi,W. Yang,Kao-Shuo Chang,M. A. Aronova,T. Venkatesan,R. D. Vispute,Leonid A. Bendersky +6 more
TL;DR: In this paper, the authors used a scanning x-ray microdiffractometer and transmission electron microscopy (TEM) to map the phase evolution across the spread and discovered a unique growth relationship between cubic and hexagonal MgxZn1−xO where their basal planes are coincident in the phase-separated region of the phase diagram.