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A mechanism for enhanced photocatalytic activity of nano-size silver particle modified titanium dioxide thin films

Science China(Technological Sciences) 2010年第11期53卷 3027-3032页

作者： MENG FanMing LU Fei sun zhaoqi LüJianGuo School of Physics and Materials Science Anhui UniversityHefei 230039China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China Anhui Key Laboratory of Information Materials and Devices Anhui UniversityHefei 230039China Department of Physics and Electronic Engineering Hefei Normal UniversityHefei 230061China

Ag-TiO2 nanostructured thin films with silver volume fraction of 0–20% were deposited on silicon and quartz substrates by RF magnetron sputtering and annealed in ambient air at 950°C for 1 h. The phase structure and surface topography of the films were characterized by X-ray diffractometer and transmission electron microscope. Photocatalytic activity of the films was evaluated by light induced degradation of methyl orange (C14H14N3NaO3S) solution using a high pressure mercury lamp as lamp-house. The relation of photocatalytic activity and silver content was studied in detail. It was found that silver content influences phase structure of TiO2 thin films, and silver in the films is metallic Ag (Ag0). With increasing silver content from 0 to 20 vol%, photocatalytic activity of the films increases first and then decreases. A suitable amount (2.5–5 vol%) silver addition can significantly enhance the photocatalytic activity of TiO2 films. The enhanced photocatalytic activity was mainly attributed to the extension of visible light absorption region of the films, the presence of anatase phase, the increase of oxy-gen anion radicals O2? and reactive center of surface Ti3+, and the better separation between electrons and holes on the films surface.

关键词： silver nanoparticle TiO2 thin film photocatalytic activity RF magnetron sputtering methyl orange

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A facile hydrothermal preparation and photoluminescence study of ZnO micro/nanostructures on Zn foils

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Science China Chemistry 2011年第10期54卷 1547-1551页

作者： WU MingZai LU XiangHua LIU YanMei MA YongQing sun zhaoqi LIU XianSong ZHANG LiDe IAnhui Key Laboratory o fin formation Materials and Devices Anhui University HeJei 230039 China CAS Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

ZnO micro/nanostructures with various morphologies were grown via hydrothermal etching of Zn *** the reaction temperature and time,rod-like,pencil-like,tube-like and flowerlike ZnO micro/nanostructures could be prepared directly on the Zn foil surface at temperatures 100-180℃ with excellent reproducibility.X-ray diffraction patterns indicated that these ZnO micro/nanostructures were *** mechanisms for the variation of morphology are ***,photoluminescence spectra of the as-grown samples revealed that all of them consist of UV emission band at around 392 nm.

关键词： crystal morphology hydrothermal photoluminescence

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Interfacial thermal stability and electrical properties of AlOxNy/Si gate stacks grown by new CVD chemistry

Interfacial thermal stability and electrical properties of A...

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TFC'11全国薄膜技术学术研讨会

作者：何刚 zhaoqi sun Shiwei shi Xueping Song School of Physics and Materials Science Anhui Key Laboratory of Information Materials and DevicesAnhui University

Compared to other precursors,dimethylaluminumhydride [(CH)AlH,DMAH] has a high vapor pressure of 2 Torr at room temperature and the ability to form AlO films with low carbon contamination through a disproportionation ***,the low deposition temperature of DMAH effectively prevents the formation of low-k interfacial layers during CVD.

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Modification of electrical properties and carrier transportation mechanism of ALD-derived HfO2/Si gate stacks by Al2O3 incorporation

Modification of electrical properties and carrier transporta...

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安徽省第四届（2016年）“卓凌杯”真空科技青年创新大赛暨学术研讨会

作者： Juan Gao Gang He zhaoqi sun Dongqi Xiao School of physics and Materials Science Radiation Detection Materials & Devices Lab Anhui University School of Sciences Anhui University of Science and Technology

Effect of AlO incorporation on the electrical properties and carrier transportation of atomic-layer-deposited(ALD) Hf Al O high-k gate dielectrics on Si substrates have been investigated. Electrical analyses indicate that interfacial properties of Hf Al O/Si gate stack has been is improved and leakage current is reduced after AlO incorporation into HfO. Additionally,the Hf Al O/n-Si sample with precursor ratio of 4:2 exhibits the lowest interface charge density( D)of 3.6×10cme V, the lowest border trapped oxide charge density( N) of 2.4×10cm, the lower density of oxide charge( Q) of 0.9×10cm, and the lowest frequency dispersion of 0.15%. In addition, the carrier transportation mechanism for both HfO and HfAlO has been investigated systematically. Based on the analysis, it can be concluded that that Poole-Frenkle(P-F) emission is main conduction mechanism at the low electric field, and direct tunneling(D-T)dominates the conduction mechanism at the high field, respectively.

关键词： High-k gate dielectric Atomic-layer-deposition Electrical properties Carrier transportation mechanism Incorporation

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Enhanced Photoelectronic Properties by CdS Nanoparticles Selectively Deposited on {101} Facets of Single Crystal TiO2 Nanosheet Array Films

Enhanced Photoelectronic Properties by CdS Nanoparticles Sel...

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安徽省第四届（2016年）“卓凌杯”真空科技青年创新大赛暨学术研讨会

作者： Lei Yang Miao Zhang Jianguo Lv Gang He zhaoqi sun School of Physics & Material Science Anhui University Army officer academy School of Electronic & Information Engineering Hefei Normal University

Single crystal TiO nanosheet array films with dominant {001} Facets were synthesized on FTO by a hydrothermal method. A simple strategy for the selective deposition of Cd S nanoparticles on the low energy {101} facets by controlling F content on the surface of Ti O2 nanosheets is developed. For CdS/TiO, under light irradiation, the photo-generated electrons flow from {001} to {101} facets,meanwhile, the photo-generated electrons transfer from Cd S nanoparticles to the TiO nanosheets. The deposition of Cd S nanoparticles on the {101} facets will shorten the path-ways that electron must travel. Herein, the synergistic effect of selective deposition of Cd S nanoparticles on the {101} facets of Ti O2 nanosheets combined with the different band edge positions of {001} and {101} facets, which would facilitate the spatial separation of electrons and holes on different facets, leading to enhanced photoelectronic performance.

关键词： TiO2 nanosheet array {101} facets Selective deposition CdS nanoparticles Photoelectronic property

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Microstructure, Optical Properties and Catalytic Performance of Cu2O-modified ZnO Nanorods Prepared by Electrodeposition

Microstructure, Optical Properties and Catalytic Performance...

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安徽省第三届（2014年）“万瑞杯”真空科技青年创新大赛暨学术研讨会

作者： Xishun Jiang Miao Zhang Shiwei Shi Gang He Xueping Song zhaoqi sun School of Physics and Materials Science Anhui University

Cu2O-modified ZnO nanorods are prepared by two-step electrodeposition method on ITO substrates and the deposition time of Cu2O is 0, 1, 5 and 10 min, respectively. Field-emission scanning electron microscope(SEM) results indicate that Cu2O particles are embedded in the interspaces of the Zn O nanorods and the amounts of the Cu2O particles increase obviously when the deposition time lasts longer. X-ray diffractometer(XRD) shows that the peaks corresponding to Zn O nanorods and Cu2O particles are detected. UV-vis absorption spectra measurements have shown the band gaps of Zn O nanorods shift from 3.22 to 2.75 e V due to the introduction of Cu2O particles. X-ray photoelectron spectroscopy(XPS) measurement confirms that the sample contains Cu+ rather than Cu2+ or Cu. The MO concentration can be reduced to around 15% in 100 min with Cu2O electrodeposition time for 10 min.

关键词： Cu2O-modified ZnO nanorods Microstructure Optical properties Catalytic Performance

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Study on transmittance spectra of ITO thin films by ellipsometric method

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Science China(Technological Sciences) 2010年第7期53卷 1893-1896页

作者： sun zhaoqi1, CAO ChunBin123, CAI Qi1 & SONG XuePing1 1 School of Physics and Material Science, Anhui University, Hefei 230039, China 2 School of Sciences, Anhui Agricultural University, Hefei 230036, China 3 Key Laboratory of Opto-electronic Information Acquisition and Manipulation, Ministry of Education, Hefei 230036, China 1. School of Physics and Material Science Anhui University Hefei 230039 China2. School of Sciences Anhui Agricultural University Hefei 230036 China3. Key Laboratory of Opto-electronic Information Acquisition and Manipulation Ministry of Education Hefei 230036 China

ITO films with thicknesses (134+8) nm, grown on glass substrates by sputtering method, were post-annealed at the temperatures of 100, 200, 300 and 400°C for 1 h, respectively. The as-deposited ITO film was amorphous, but crystallized with annealing at elevated temperatures, as demonstrated by X-ray diffraction. The transmittance spectra of all samples were obtained and subsequently simulated by means of spectroscopic ellipsometry. The optical constants n and k of the films were extracted. With the annealing temperature increasing, the optical constants n and k of the films firstly decreased then increased in the whole investigated wavelength range. The optical band gaps of all films were evaluated and they varied between 3.74 and 3.93 eV.

关键词： ITO films optical constants transmittance spectra spectroscopic ellipsometry analysis

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不同改性过程对氧化锌薄膜的光学及亲水性能的影响

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真空科学与技术学报 2015年第3期35卷 276-280页

作者：朱旭石市委夏茹孙兆奇安徽大学化学化工学院合肥230601 绿色高分子材料安徽省重点实验室合肥230601 安徽大学物理与材料科学学院合肥230601 安徽大学微弱信号感测材料及器件集成协同创新研究中心合肥230601

采用溶胶-凝胶的方法在玻璃基片上制备了纳米ZnO薄膜,利用月桂酸钠、硅烷偶联剂对ZnO薄膜进行改性以研究不同改性过程对ZnO薄膜光学及亲水性能的影响。利用接触角测试、扫描电镜、紫外可见光光度计、荧光光谱仪等方法研究了改性后的纳... 详细信息

采用溶胶-凝胶的方法在玻璃基片上制备了纳米ZnO薄膜,利用月桂酸钠、硅烷偶联剂对ZnO薄膜进行改性以研究不同改性过程对ZnO薄膜光学及亲水性能的影响。利用接触角测试、扫描电镜、紫外可见光光度计、荧光光谱仪等方法研究了改性后的纳米氧化锌薄膜的微结构、光学性能及亲水疏水性等。结果表明,采用不同的改性剂或不同的改性剂并用体系可以使氧化锌薄膜表面的施主缺陷浓度不同,从而导致氧化锌薄膜的光学性能及表面亲水疏水性随改性过程的不同而呈现一定的变化规律。

关键词： ZnO薄膜表面改性溶胶-凝胶亲水疏水性

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氧化铟锡薄膜的椭偏光谱研究

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光学学报 2008年第2期28卷 403-408页

作者：孙兆奇曹春斌宋学萍蔡琪安徽大学物理与材料科学学院

用溅射法在Si片上制备了厚度为140nm的氧化铟锡（ITO）薄膜。X射线衍射研究表明所制备的薄膜为多晶结构。在1．5～4．5eV范围内对ITO薄膜进行了椭偏测量。分别用德鲁德-洛伦茨谐振子（Drude4-Lorenzoscillators）模型、层进模型结合有... 详细信息

用溅射法在Si片上制备了厚度为140nm的氧化铟锡（ITO）薄膜。X射线衍射研究表明所制备的薄膜为多晶结构。在1．5～4．5eV范围内对ITO薄膜进行了椭偏测量。分别用德鲁德-洛伦茨谐振子（Drude4-Lorenzoscillators）模型、层进模型结合有效介质近似模型对椭偏参量ψ、△进行了拟合，得到ITO薄膜的折射指数n的变化范围在1.8～2.6之间，可见光范围内消光系数k接近于零，在350nm波长附近开始明显变化，且随着波长的减小k迅速增加。计算得到直接和间接光学带隙分别是3．8eV和4．2eV。并在1．5～4．5eV段给出一套较为可靠的、具有实用价值的ITO介电常量和光学常量。

关键词：薄膜光学椭圆偏振术光学常量测量椭偏建模及解谱 ITO薄膜

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新型耐高温聚酰亚胺改性环氧粘合剂的研制

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绝缘材料 2017年第10期50卷 6-9页

作者：虞鑫海孙兆琪东华大学应用化学系上海201620

以环氧树脂JP-80、聚酰亚胺树脂与活性稀释剂和固化剂为原料,制得了一种新型耐高温聚酰亚胺改性环氧粘合剂,并通过对黏度-温度依赖性、凝胶化时间-温度依赖性、高低温下的拉伸剪切强度跟踪,对粘合剂的耐热性能、力学性能等进行了研究。... 详细信息

以环氧树脂JP-80、聚酰亚胺树脂与活性稀释剂和固化剂为原料,制得了一种新型耐高温聚酰亚胺改性环氧粘合剂,并通过对黏度-温度依赖性、凝胶化时间-温度依赖性、高低温下的拉伸剪切强度跟踪,对粘合剂的耐热性能、力学性能等进行了研究。结果表明:此种粘合剂在200℃的拉伸剪切强度达到最高(21.45 MPa),表观活化能Ea为69.9 k J/mol,黏度性能较好。

关键词：环氧树脂聚酰亚胺粘合剂改性耐高温

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