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Raman scattering and photoluminescence of Fe-doped ZnO nanocantilever arrays

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Chinese Science Bulletin 2008年第11期53卷 1639-1643页

作者： ZHANG Bin ZHOU ShaoMin WANG HaiWei du zuliang Key Laboratory for Special Functional Materials Henan University Kaifeng 475004 China

Single crystalline Fe-doped ZnO nanocantilever arrays have been synthesized by thermal evaporating amorphous Zn-Fe-C-O composite powder. The characterizations of composition, structure and phonon spectrum properties of the nanocantilevers have been performed. Arrays of uniform, perfectly aligned and single-crystal nanowires have been observed by electron microscopy. The results of the X-ray photo-electric spectra and the Raman spectrum provide the evidence that Fe is incorporated into the ZnO lattice at Zn site. Abnormally, the room temperature UV emission band of Fe-doped ZnO nanocan-tilevers disappears and the green one has a large red-shift, and the intensity of the green emission is strongly quenched because the Fe3+ enters the ZnO crystal lattice.

关键词：纳米线阵列氧化锌铁掺杂喇曼散射光致发光

CuInSe_2 thin films obtained by pulse-plating electrodeposition technique with novel pulse wave

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Chinese Science Bulletin 2010年第18期55卷 1854-1858页

作者： WANG XiaoLi WANG GuangJun TIAN BaoLi WAN ShaoMing du zuliang Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 China

CuInSe2 films were electrodeposited onto indium tin oxide(ITO) substrate in constant current mode using bell-like wave modulated square wave in aqueous *** films obtained at different pulse frequencies were characterized by scanning electron microscopy(SEM),X-ray energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD).UV-Vis-NIR absorption spectro scopy was used to study the optical properties of these *** results showed that the chalcopyrite phase CuInSe2 films with a smooth surface and stoichiometric composition could be obtained at appropriate pulse *** crystallinity of CuInSe2 films could be further improved after annealing *** this,we also found that the films obtained using the pulse-plating electrodeposition technique had a faster deposition rate and better film adhesion ability than that using the traditional CIS electrodeposition technique,which is significant to the low-cost CIS thin film solar cell production.

关键词： CuInSe2薄膜脉冲电镀技术 CulnSe2 脉冲波扫描电子显微镜近红外吸收光谱脉冲频率铟锡氧化物

Fabrication of metal oxide nanostructures based on Atomic Force Microscopy lithography

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Science China(Physics,Mechanics & Astronomy) 2008年第10期51卷 1448-1454页

作者： ZHU XiaoYang CHENG Gang WANG ShuJie DAI ShuXi WAN ShaoMing ZHANG XingTang du zuliang Key Laboratory for Special Functional Materials Henan UniversityKaifeng 475004China

Atomic Force Microscopy (AFM) mechanical lithography is a simple but significant method for nanofabrication. In this work, we used this method to construct nanos- tructures on Pt/Cu bilayer metal electrodes under ambient conditions in air. The influence of various scratch parameters, such as the applied force, scan velocity and circle times, on the lithography patterns was investigated. The Pt-Cu-CuxO-Cu-Pt nanostructure was constructed by choosing suitable scratch parameters and oxidation at room temperature. The properties of the scratched regions were also investigated by friction force microscopy and conductive AFM (C-AFM). The I-V curves show symmetric and linear properties, and Ohmic contacts were formed. These results indicate that AFM mechanical lithography is a powerful tool for fabricating novel metal-semiconductor nanoelectronic devices.

关键词： Atomic Force Microscopy mechanical lithography nanostructures Pt/Cu films

Fabrication of gold nanoelectrodes based on nanolithography electrochemically through a conductive AFM tip

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Chinese Science Bulletin 2005年第22期50卷 2560-2564页

作者： LI Tianfeng ZHANG Xingtang JIANG Xiaohong LI Yuncai du zuliang Key Laboratory for Special Function Materials Henan UniversityKaifeng 475001. China

Gold nanoelectrodes were fabricated by ap- proach of combining surface self-assembly with nanolitho- graphy electrochemically through a conductive AFM tip. The controllable structure with width and distance in nanometer as a template was constructed by nanolithography patterning process, which was accomplished by a conductive AFM tip on certain highly ordered long-tail organosilane monolayers. Then through adsorption of Cd2+ and exposure of the Cd2+-loaded surface to gaseous H2S, CdS nanowires were generated in a template-controlled self-assembly process. Finally, metallic gold nanowires were conversed from CdS nanowires by treatment with the aqueous solution of HAuCl4 via a redox chemical process, which had good conductivity proved by C-AFM.

关键词： OTS 自集合薄膜纳米电极传导性电化学

Solvothermal synthesis of CdS nanorods and photovoltaic characteristics of CdS/PVK composite system

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Chinese Science Bulletin 2008年第1期53卷 46-52页

作者： JI YanLing CHENG Ke ZHANG HongMei ZHANG XingTang LI YunCai du zuliang Key Lab for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 China

Large quantities of CdS nanorods are successfully synthesized through Cd(CH3COO)2·2H2O reacting with Na2S·9H2O and EDA in aqueous solution. XRD result shows that the sample is of hexagonal structure. And TEM result shows that the morphologies of the resulting CdS are mainly in three-armed rod-like structure with a diameter of 10―15 nm and a length of 100 nm. The nanocomposites of CdS/PVK with different molar ratios are prepared by spin coating method on tin-doped indium oxide (ITO) substrate. A notable decrease of photoluminescence (PL) efficiency and a significant enhance-ment of surface photovoltage signal have been observed in CdS/PVK composites when the molar frac-tion of CdS increases. We interpret these results as the energy level matching between CdS and PVK in nanocomposites. This energy level matching facilitates fast interfacial charge transfer then increases the separation efficiency of electron-hole pairs and the carrier generation efficiency. The detailed charge transfer process has also been demonstrated.

关键词：复合材料光电特性纳米杆载荷传输

Preparation of sodium titanate nanotubes modified by CdSe quantum dots and their photovoltaic characteristics

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Science China Chemistry 2008年第10期51卷 976-982页

作者： ZHANG HongMei CHENG Ke JI YanLing LIU XiaoLan LI LinSong ZHANG XingTang du zuliang Key Lab for Special Functional Materials of Ministry of Education Henan UniversityKaifeng 475004China

Sodium titanate nanotubes have been prepared and modified chemically with CdSe quantum dots (QDs) using bifunctional modifiers (HS-COOH). Their photovoltaic characteristics have also been studied. The results indicate that the surface photovoltage response of nanotubes extends to the visible light region, and the intensity of surface photovoltage is enhanced after modification with CdSe QDs. The field-induced surface photovoltage spectroscopy (FISPS) shows that sodium titanate nanotubes have different photovoltaic response before and after modification. That is, the surface photovoltaic re-sponse of pure sodium titanate nanotubes increases with the enhancement of positive applied bias and decreases with the enhancement of negative applied bias. Meanwhile, the surface photovoltaic re-sponse of CdSe modified sodium titanate nanotubes is different from that of the pure sodium titanate nanotubes. The whole spectrum increases with the enhancement of applied bias at the first stage. However, when the applied bias reaches a certain value, the surface photovoltage response keeps in-creasing in some spectrum regions, while decreasing in other spectrum regions. This novel phe-nomenon is explained by using an electric field induced dipole model.

关键词： sodium titanate nanotube CdSe surface photovoltage spectroscopy diffusion mechanism drift mechanism

Investigation of tribological properties of composite C_(60)-LB films

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Chinese Science Bulletin 2006年第15期51卷 1811-1817页

作者： YANG Guanghong ZHANG Xingtang XUN Jun JIANG Xiaohong ZHANG Pingyu du zuliang Key Laboratory for Special Functional Materials Henan University Kaifeng 475001 China

Composite C60-LB films were fabricated by the Langmuir-Blodgett (LB) technique, their micro- structures, micro- and macro-tribological properties were investigated using atomic force microscope/ friction force microscope (AFM/FFM). The results showed that in the confined C60-LB films there were two kinds of structures for the special C60 assembly: grain diameters of one kind were in the range of 150 -230 nm; the other was smaller than 20 nm. Mi- cro-tribological studies showed that topographical images of tiny C60 aggregates (duced. Tiny C60 aggregates were mainly the lubri- cating agents. Friction coefficients of composite C60-LB films gradually reduced with loads increasing having the same friction coefficient-load relations with boundary lubrication films.

关键词： C60-LB 复合薄膜聚合摩擦性能棘轮机构

Synthesis and characterization of BiFeO_3 nanotube arrays and Y-junction BiFeO_3 nanotubes

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Chinese Science Bulletin 2009年第5期54卷 719-722页

作者： LI ChunYang LIU Bing ZHAO JianPo WANG JiangFeng HU BinBin du zuliang Key Laboratory for Special Functional Materials Henan University Kaifeng 475004 China

Multiferroic BiFeO3 (BFO) nanotube arrays (～100 nm in diameter and ～50 μm in length) were synthesized by the sol-gel method utilizing the anodic aluminum oxide (AAO) membrane technique. The micro-structure and chemical components of the BFO nanotubes were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectrometer (XPS). The BFO nanotubes exhibited polycrystalline microstructures. The novel Y-junction BFO nano-tubes were simultaneously fabricated.

关键词：氧化铝模板技术铁酸铋纳米管阵列溶胶-凝胶法

Chemical modification and the photoluminescence stabilization of titanic acid nanotubes

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Science China Chemistry 2006年第2期49卷 155-161页

作者： ZHANG Xingtang WANG Yumei ZHANG Chunmei JIANG Xiaohong TIAN Baoli LI Yuncai HUANG Yabin du zuliang Key Laboratory for Special Functional Materials Henan UniversityKaifeng 457001China

Titanic acid nanotubes(H_(2)Ti_(2)O_(4)(OH)_(2))were surface-modified with cetyl alcohol through dehydration reaction because of existence of Ti–*** modified nanotubes were characterized by transmission electron microscopy(TEM),Fourier Transform Infrared(FT-IR)spectrometry and pho-toluminescence(PL)*** results indicate that the modified nanotubes can be easily dis-persed into organic solvent such as chloroform and toluene in contrast with the unmodified nanotubes,which makes it easier to be assembled by LB ***,the Ti-O-CH_(2)(CH_(2))_(14)CH_(3) on the surface of the nanotubes can hinder the adsorption of water and consequently the photoluminescence property of the nanotubes can be *** though kept in humid condition or in air for a long time,the modified nanotubes also maintain the special photoluminescence property in the visible region.

关键词： titanic acid nanotubes surface-modification photoluminescence