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RISS 인기검색어
- 검색키워드
- 저자 : C.W. Zou (검색결과 7 건)
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C.W. Zou,J. Wang,F. Liang,W. Xie,L.X. Shao,D. J. Fu 한국물리학회 2012 Current Applied Physics Vol.12 No.5
Thermal evaporation was carried out in a horizontal quartz tube under an oxygen flow of about 50 ml/min and the influence of reaction time and temperature on the microstructure of the CuO nanowires (CNWs) is examined. The magnetic susceptibilities of the as-synthesized CNWs in the 5e300 K range were studied. It is interesting to note that the CNWs with a much larger diameter than 10 nm exhibit anomalous ferromagnetic behavior which has never been reported previously, demonstrating the effect of their peculiar morphology. The saturation magnetization (MS) and coercive field (Hc) of CNWs grown at 700 ℃ are 2.39 × 10-4 emu and 48 Oe, respectively. We fabricated gas sensors based on p-type single CNWs and demonstrate that CuO nanowires could be a promising candidate for a gas sensor with good performance. The reaction between the reducing gas and O leads to a decrease of the hole density in the surface charge layer and an increase of the CuO resistance.
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Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures
Zou, C.W.,Gao, W. The Korean Institute of Electrical and Electronic 2010 Transactions on Electrical and Electronic Material Vol.11 No.1
This is an overview paper reporting our most recent work on processing and microstructure of nano-structured oxides and their photoluminescence and photo-catalysis properties. Zinc oxide and related transition metal oxides such as vanadium pentoxide and titanium dioxide were produced by a combination of magnetron sputtering, hydrothermal growth and atmosphere controlled heat treatment. Special morphology and microstructure were created including nanorods arrays, core-brushes, nano-lollipops and multilayers with very large surface area. These structures showed special properties such as much enhanced photoluminescence and chemical reactivity. The photo-catalytic properties have also been promoted significantly. It is believed that two factors contributed to the high reactivity: the large surface area and the interaction between different oxides. The transition metal oxides with different band gaps have much enhanced photoluminescence under laser stimulation. Use of these complex oxide structures as electrodes can also improve the energy conversion efficiency of solar cells. The mixed oxide complex may provide a promising way to high-efficiency photo emitting materials and photo-catalysts.
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Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures
C. W. Zou,W. Gao 한국전기전자재료학회 2010 Transactions on Electrical and Electronic Material Vol.11 No.1
This is an overview paper reporting our most recent work on processing and microstructure of nano-structured oxides and their photoluminescence and photo-catalysis properties. zinc oxide and related transition metal oxides such as vanadium pentoxide and titanium dioxide were produced by a combination of magnetron sputtering, hydrothermal growth and atmosphere controlled heat treatment. Special morphology and microstructure were created including nanorods arrays, core-brushes, nano-lollipops and multilayers with very large surface area. These structures showed special properties such as much enhanced photoluminescence and chemical reactivity. The photo-catalytic properties have also been promoted significantly. It is believed that two factors contributed to the high reactivity: the large surface area and the interaction between different oxides. The transition metal oxides with different band gaps have much enhanced photoluminescence under laser stimulation. Use of these complex oxide structures as electrodes can also improve the energy conversion efficiency of solar cells. The mixed oxide complex may provide a promising way to high-efficiency photo emitting materials and photo-catalysts.
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Hydrogen storage in Ca-decorated, B-substituted metal organic framework
Zou, X.,Cha, M.H.,Kim, S.,Nguyen, M.C.,Zhou, G.,Duan, W.,Ihm, J. Pergamon Press ; Elsevier Science Ltd 2010 International journal of hydrogen energy Vol.35 No.1
The feasibility to store hydrogen in calcium-decorated metal organic frameworks (MOFs) is explored by using first-principles electronic structure calculations. We show that substitution of boron atoms into the benzene ring of the MOF linker substantially enhances the Ca binding energy to the linker as well as the H<SUB>2</SUB> binding energy to Ca. The Kubas interaction between H<SUB>2</SUB> molecules and Ca added in the MOF gives rise to a large number of bound H<SUB>2</SUB>'s (8H<SUB>2</SUB>'s per linker) with the binding energy of 20 kJ/mol, which makes the system suitable for reversible hydrogen storage under ambient conditions.
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Multilocus Sequence Typing and Virulence Factors Analysis of Escherichia coli O157 Strains in China
Xiao W. Ji,Ya L. Liao,Ye F. Zhu,Hai G. Wang,Ling Gu,Jiang Gu,Chen Dong,Hong L. Ding,Xu H. Mao,Feng C. Zhu,Quan M. Zou 한국미생물학회 2010 The journal of microbiology Vol.48 No.6
Escherichia coli O157:H7, an important food-borne pathogen, has become a major public health concern worldwide. The aim of this study was to investigate the molecular epidemiologic feature of E. coli O157:H7strains in China. 105 E. coli O157:H7 isolates were collected from various hosts and places over 9 years. A multilocus sequence typing scheme (MLST) was applied for bacteria genotyping and polymerase chain reaction (PCR) was used for virulence factor identification. Seven new MLST sequence types (STs), namely ST836, ST837, ST838, ST839, ST840, ST841, and ST842 were identified, which grouped into two lineages. Phylogenetic analysis suggested that the most two frequent STs in China, ST837 and ST836, may be the derivatives of E. coli O157:H7 Sakai or E. coli O157:H7 EDL933. Geographical diversity and host variety of E. coli O157:H7 were observed in China. In addition, the different distribution of tccp was detected. The data presented herein provide new insights into the molecular epidemiologic feature of E. coli O157:H7, and aid in the investigation of the transmission regularity and evolutionary mechanism of E. coli O157:H7.
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GaN films prepared by middle frequency magnetron sputtering
M. Li,C. W. Zou,M. L. Yin,C. S. Liu,L. P. Guo,D. J. Fu 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
A middle-frequency (MF) sputter system was developed for the growth of GaN films. The key part of the system is dish-shape twin targets back cooled by refrigerated water and powered by a 40-kHz MF power supply. GaN films prepared on Si(111) by this system were hexagonal in structure. The X-ray diffraction pattern shows (002) as the preference orientation. GaN films produced under optimal conditions have an almost 1:1 N:Ga ratio as determined by energy-dispersive spectroscopy. We obtained a band gap of 3.2 eV by extrapolating absorption plots for GaN films deposited on glass substrate under standard conditions. A middle-frequency (MF) sputter system was developed for the growth of GaN films. The key part of the system is dish-shape twin targets back cooled by refrigerated water and powered by a 40-kHz MF power supply. GaN films prepared on Si(111) by this system were hexagonal in structure. The X-ray diffraction pattern shows (002) as the preference orientation. GaN films produced under optimal conditions have an almost 1:1 N:Ga ratio as determined by energy-dispersive spectroscopy. We obtained a band gap of 3.2 eV by extrapolating absorption plots for GaN films deposited on glass substrate under standard conditions.
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