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瞬态光电导谱研究Pt的负载对TiO_2光生载流子寿命的影响 被引量:3
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作者 张雯 王绪绪 付贤智 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2005年第10期1861-1864,共4页
采用瞬态光电导谱研究了TiO2的光电导衰减曲线,通过计算机拟合得到光生载流子的寿命,并考察了Pt的负载量对TiO2光生载流子有效寿命的影响.结果表明,增大Pt的负载量,可延缓光电导的衰减趋势,从而延长TiO2光生载流子的有效寿命,有效地降... 采用瞬态光电导谱研究了TiO2的光电导衰减曲线,通过计算机拟合得到光生载流子的寿命,并考察了Pt的负载量对TiO2光生载流子有效寿命的影响.结果表明,增大Pt的负载量,可延缓光电导的衰减趋势,从而延长TiO2光生载流子的有效寿命,有效地降低了光生载流子的复合率. 展开更多
关键词 瞬态光电导谱 TIO2 PT/TIO2
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用微波光电导谱研究半导体薄片的少子扩散长度和表面复合速度 被引量:2
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作者 褚幼令 王宗欣 +1 位作者 刘瑞林 左文德 《Journal of Semiconductors》 EI CAS CSCD 北大核心 1990年第10期751-758,共8页
当半导体薄片同时受到微波和光照射时,通过样品的微波传输系数与光的波长有关,当光的波长连续地变化时,微波传输系数也连续地变化。本文分析了在半导体薄片中的少子扩散长度、少子寿命及表面复合速度与上述微波传输系数的变化△T之间的... 当半导体薄片同时受到微波和光照射时,通过样品的微波传输系数与光的波长有关,当光的波长连续地变化时,微波传输系数也连续地变化。本文分析了在半导体薄片中的少子扩散长度、少子寿命及表面复合速度与上述微波传输系数的变化△T之间的关系,并通过测量半导体薄片的微波光电导谱计算这些参数。研究表明,可以从微波光电导谱中的△T的峰值位置直接算出少子扩散长度。这是一种无接触、无损伤的快速测试方法,测试区域是直径为3mm的一个圆斑,样品可以在测试台上自由移动。本方法的测试结果与其它方法所得的结果是较为一致的。 展开更多
关键词 半导体薄片 光电导谱 扩散长度
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碲镉汞杂质缺陷的红外磁光电导谱
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作者 刘普霖 陆卫 +7 位作者 陆晓峰 陈张海 石晓红 史国良 龚海梅 胡晓宁 徐国森 沈杰 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 1996年第5期358-362,共5页
测量了n-Hg1-xCdxTe(x=0.2-0.3)在4.2K下的磁光电导光谱,观察到与杂质、缺陷有关的光电导峰,研究了它们随磁场的变化。
关键词 HGCDTE 杂质 缺陷 红外磁光电导谱
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硅价带自旋-轨道分裂的高分辨率光电导谱测定
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作者 俞志毅 黄叶肖 沈学础 《Journal of Semiconductors》 EI CAS CSCD 北大核心 1989年第5期399-402,共4页
采用高分辨率光电导谱观察到高纯区熔硅单晶中剩余硼受主从基态到各共振激发态的p<sub>1/2</sub>系列跃迁谱线.考虑裂开P<sub>1/2</sub>价带的非抛物线性,精确得到了硼杂质从基态到P<sub>1/2</sub>... 采用高分辨率光电导谱观察到高纯区熔硅单晶中剩余硼受主从基态到各共振激发态的p<sub>1/2</sub>系列跃迁谱线.考虑裂开P<sub>1/2</sub>价带的非抛物线性,精确得到了硼杂质从基态到P<sub>1/2</sub>价带的电离能E<sub>1</sub><sup>*</sup>(硼)=88.45±0.01meV,进而获得硅价带的自旋-轨道分裂为△<sub>o</sub>=42.62±0.01meV. 展开更多
关键词 光电导谱 价带自旋 轨道分裂
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硅中浅杂质A^+态的远红外光电导谱
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作者 张兵临 K.Kangarlu H.R.Chandrakhar 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 1990年第3期16-17,35,共3页
用Fourier变换光谱仪测定了Si:B,Si:Al,及Si:Ga诸样品的A^+态远红外光电导谱,并首次测得了电场对A^+态的影响。对实验结果及A^+态产生机制进行了讨论。
关键词 杂质 远红外 光电导谱 半导体
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Si_(1-x)Ge_x合金的浅杂质光电导谱
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作者 石晓红 陈忠辉 +3 位作者 黄醒良 史国良 刘普霖 沈学础 《Journal of Semiconductors》 EI CAS CSCD 北大核心 1995年第8期632-635,共4页
在4.2—50K温度范围内研究了直拉法生长的富含Si的Si(1-x)Gex合金的浅杂质光电导谱,首次观察到了锗硅合金中从硼受主杂质基态到p3/2价带的光电离跃迁过程及硼受主杂质的与自旋-轨道分裂带(p1/2价带)相联... 在4.2—50K温度范围内研究了直拉法生长的富含Si的Si(1-x)Gex合金的浅杂质光电导谱,首次观察到了锗硅合金中从硼受主杂质基态到p3/2价带的光电离跃迁过程及硼受主杂质的与自旋-轨道分裂带(p1/2价带)相联系折光电导过程,并由此确定了硼杂质的电离能.结果表明,低锗组分下,Si(1-x)Gex合金中浅受主杂质电离能随合金组分线性变化. 展开更多
关键词 硅锗合金 半导体材料 光电导谱 杂质
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硅薄膜材料的光电导谱分析
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作者 郝会颖 李伟民 《光谱实验室》 CAS CSCD 北大核心 2011年第1期282-285,共4页
利用甚高频等离子体增强化学气相沉积法(VHF-PECVD),通过改变氢稀释比制备出一系列硅薄膜样品。由弱光条件下光电导谱分析了材料的吸收系数及缺陷态密度,结果表明随着氢稀释比的增加,材料的长波响应增大,缺陷态密度(NS)逐渐减小,当大于1... 利用甚高频等离子体增强化学气相沉积法(VHF-PECVD),通过改变氢稀释比制备出一系列硅薄膜样品。由弱光条件下光电导谱分析了材料的吸收系数及缺陷态密度,结果表明随着氢稀释比的增加,材料的长波响应增大,缺陷态密度(NS)逐渐减小,当大于16.7时,NS开始增加,这是杂质与晶粒间界相互作用的结果。 展开更多
关键词 硅薄膜 光电导谱 缺陷态密度
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硅中浅杂质的激光感应光电导谱
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作者 张兵临 A. KANGARLU H. R. CHANDKASEKHAR 《光学学报》 EI CAS CSCD 北大核心 1989年第12期1115-1118,共4页
首次采用光子能量小于硅中浅受主杂质电离能的可调谐远红外激光器作为激发源,获得了硅中浅受主杂质的光电导谱.可调谐半导体远红外激光器的调谐范围为380~500cm^(-1),光子流密度约10^(18)/cm^2·sec,用双光子跃迁对光电导谱进行了... 首次采用光子能量小于硅中浅受主杂质电离能的可调谐远红外激光器作为激发源,获得了硅中浅受主杂质的光电导谱.可调谐半导体远红外激光器的调谐范围为380~500cm^(-1),光子流密度约10^(18)/cm^2·sec,用双光子跃迁对光电导谱进行了解释.对于Si:Al样品,光电导谱中的双峰分别相应于2P^1和2P^2中间态的双光子共振跃迁.也观察到了双光子透明的反共振现象. 展开更多
关键词 光电导谱 杂质 半导体 激光感应
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有机/无机复合结构光电导型器件的光激发机制 被引量:5
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作者 靳辉 滕枫 +4 位作者 刘俊峰 孟宪国 徐征 侯延冰 徐叙瑢 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2004年第8期918-921,共4页
制备了PVK/ZnS有机无机复合的光电导型器件 ,器件结构分别为Glass/ITO/PVK/Al;Glass/ITO/ZnS/Al;Glass/ITO/ZnS/PVK/Al。通过研究此复合器件在外加电场作用下的稳态光电导激发谱 ,得到了基本光激发过程。把PVK/ZnS的吸收谱和器件的光电... 制备了PVK/ZnS有机无机复合的光电导型器件 ,器件结构分别为Glass/ITO/PVK/Al;Glass/ITO/ZnS/Al;Glass/ITO/ZnS/PVK/Al。通过研究此复合器件在外加电场作用下的稳态光电导激发谱 ,得到了基本光激发过程。把PVK/ZnS的吸收谱和器件的光电导谱进行比较 ,知道虽然两者的吸收对器件光电流都有贡献 ,但有效部分在PVK和ZnS的界面处。 展开更多
关键词 有机/无机复合结构光电导型器件 光激发机制 激发态过程 稳态光电导谱 吸收谱 场致猝灭谱
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MgZnO薄膜的制备及其光电特性
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作者 邬小鹏 傅竹西 《功能材料》 EI CAS CSCD 北大核心 2011年第9期1653-1656,共4页
采用射频磁控溅射用x=0.00~0.45的MgxZn1-xO陶瓷靶在Si(100)和石英衬底上生长一系列的MgxZn1-xO薄膜。用XRD、XPS、透射谱和光电导谱对样品进行表征。结果表明用MgxZn1-xO薄膜在x≤0.325时具有单一(002)取向的六方结构,其禁带宽度Eg随... 采用射频磁控溅射用x=0.00~0.45的MgxZn1-xO陶瓷靶在Si(100)和石英衬底上生长一系列的MgxZn1-xO薄膜。用XRD、XPS、透射谱和光电导谱对样品进行表征。结果表明用MgxZn1-xO薄膜在x≤0.325时具有单一(002)取向的六方结构,其禁带宽度Eg随x增加而增大,在薄膜表面入射光能量大于禁带宽度时有光电响应,并且在x=0.325时得到了禁带宽度为4.90eV的MgxZn1-xO薄膜。在x≥0.40时出现立方相结构,禁带宽度有所减小,说明此时已为混相薄膜。 展开更多
关键词 MGXZN1-XO XRD XPS 透射谱 光电导谱
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无接触法测量多晶硅材料的少子扩散长度
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作者 褚幼令 王宗欣 《固体电子学研究与进展》 CAS CSCD 北大核心 1992年第4期353-356,共4页
用微波光电导谱仪无接触、非破坏性地测量了多晶硅的微波光电导谱,推导了由光电导谱计算多晶硅样品的少子扩散长度和表面复合速度的计算方法,并由此算得了样品的少子扩散长度和表面复合速度。测试区域是一个直径为3mm的圆斑。这是一种... 用微波光电导谱仪无接触、非破坏性地测量了多晶硅的微波光电导谱,推导了由光电导谱计算多晶硅样品的少子扩散长度和表面复合速度的计算方法,并由此算得了样品的少子扩散长度和表面复合速度。测试区域是一个直径为3mm的圆斑。这是一种简便而又准确的测试方法。这样的方法还适用于GaAs薄片材料少子扩散长度的测量和计算。 展开更多
关键词 多晶硅 扩散 载流子 光电导谱
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光谱与光谱理论
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《中国光学》 EI CAS 1996年第3期11-11,共1页
O433.5 96031468二维Hubbard模型光电导谱的研究=Study ofphotoconductive spectra of two-dimensionalHubbard model[刊,中]/陈锋,应和平,李文铸(浙江大学物理系.浙江,杭州(310027))//低温物理学报.-1995,17(4).-313-317用巨正则量子... O433.5 96031468二维Hubbard模型光电导谱的研究=Study ofphotoconductive spectra of two-dimensionalHubbard model[刊,中]/陈锋,应和平,李文铸(浙江大学物理系.浙江,杭州(310027))//低温物理学报.-1995,17(4).-313-317用巨正则量子蒙特卡洛和最大熵方法研究了二维正方格点上Hubbard模型光电导谱。在半满条件下,光电导谱呈现一能隙区。掺杂后,光电导谱在w=0处出现Drude峰,在能隙区出现一新峰。 展开更多
关键词 光电导谱 低温物理学 蒙特卡洛 方法研究 同时谱 能隙 巨正则 模型 浙江大学 苯乙烯等离子体
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Laser-induced Fluorescence and Dispersed Fluorescence Spectroscopy of NiB: Identification of a New 2П State in 19000-22100 cm^-1
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作者 甄军峰 王莉 +2 位作者 秦成兵 张群 陈旸 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第6期626-629,745,共5页
The laser-induced fluorescence excitation spectra of jet-cooled NiB radicals have been recorded in the energy range of 19000-22100 cm-1. Eleven bands have been assigned to the [20.77]2П-X2∑+ transition system for t... The laser-induced fluorescence excitation spectra of jet-cooled NiB radicals have been recorded in the energy range of 19000-22100 cm-1. Eleven bands have been assigned to the [20.77]2П-X2∑+ transition system for the first time. The dispersed fluorescence spectra related to most of these bands have been investigated. Vibrationally excited levels of the ground electronic state, with v" up to 6, have been observed. In addition, the lifetimes for almost all the observed bands have also been measured. 展开更多
关键词 NIB Laser-induced fluorescence Dispersed fluorescence Direct cm'rent discharge
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Resonance and Antiresonance in Electronic Transport Process Through a T-Shaped Quantum Waveguide
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作者 GAO Wen-Zhu ZHENG Yi-Song GONG Wei-Jiang SUN Lang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第4期1039-1044,共6页
By means of the transfer matrix approach, the linear conductance spectrum for electronic transport through a T-shaped quantum waveguide is calculated. The resonant peaks and the antiresonant dips in the conductance sp... By means of the transfer matrix approach, the linear conductance spectrum for electronic transport through a T-shaped quantum waveguide is calculated. The resonant peaks and the antiresonant dips in the conductance spectrum are mainly focused. The previous prediction about their positions by other theoretical approaches is checked. In addition, a function of spin filtering is suggested based on the interplay of the resonance and antiresonance in this T-shaped quantum waveguide. 展开更多
关键词 transfer matrix method linear conductance spectrum electronic transport quantum waveguide
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Measurement of Deep Energy Level in InP: Fe by the Method of OTCS
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作者 SHAO Limei (Jilin Polytechnic University, Changchun 130022, CHN) YANG Wei YANG Ming YAN Ruhui (Technology Academy of Armor Force of P. L. A., Changchun 130117, CHN ) 《Semiconductor Photonics and Technology》 CAS 1998年第2期78-83,共6页
We have measured the deep energy level of the InP: Fe which is semi -insulator through the method of OTCS. The effect of light intensity on OTCS measurement is mainly discussed. There are electron trap of E_T =0.34 eV... We have measured the deep energy level of the InP: Fe which is semi -insulator through the method of OTCS. The effect of light intensity on OTCS measurement is mainly discussed. There are electron trap of E_T =0.34 eV and hole trap of E_T = 1.13 eV in InP: Fe under the strong light and low temperature. The location of the OTCS peak of electron trap (E_T = 0.34 eV) moves towards the direction of high temperaturer, when the light intensity was increased, E_T is different under different light intensity. It is corrected in terms of theory that the stuff ratio of the deep energy level is affected by the light intensity. The experiments show that the error is decreased greatly with the correction. 展开更多
关键词 Impurity Level Measurement Optical Transient Current Spectroscopy Semiconductor Materials
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Gold (III) Complexes with Thiolactate and bis-(1,4-Sodiumthiolactate) Butane Ligands
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作者 Buttrus Nabeel Hadi Al-Asalli Saba Momtaz Saeed Farah Tariq 《Journal of Chemistry and Chemical Engineering》 2013年第6期495-501,共7页
The new ligand bis-(1,4-sodium thiolactate) butane (L)-O2CCH3S-(CH2)4SCHCH3CO2- has been prepared from the reaction of disodium salt of thiolactic acid and 1,4-dichlorobutane, while the disodium thiolactate was ... The new ligand bis-(1,4-sodium thiolactate) butane (L)-O2CCH3S-(CH2)4SCHCH3CO2- has been prepared from the reaction of disodium salt of thiolactic acid and 1,4-dichlorobutane, while the disodium thiolactate was prepared instanteously through the reaction of thiolactic acid with NaOH. Mono and dinuclear complexes were obtained by direct reaction of the above ligands with H[AuCI4] in 1 : 1, 2:1, 1:2, 2:2 and 3:1 ligands to metal molar ratio. The prepared complexes were characterized by elemental analysis, spectral studies FTIR (Fourier transform Infrared) and UV-Vis, magnetic measurement, conductivity measurement and IHNMR for the ligand (L) and some of the complexes. The conductance data indicate that the complexes of the formulas Na[Au(SCH3CHCOO)2], Na[Au(SCH3CHCOO)(OOCCHCH3SH)2] and [Au(L)]Cl are 1:1 electrolyte. Electronic spectra and magnetic moment values indicate the presence of square planner geometry around Au(III) ions. 展开更多
关键词 Gold complexes thiolactate ligand bis-(1 4-sodium thiolactate) butane.
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Dielectric properties and relaxation dynamics in PbF_2-TeO_2-B_2_O3-Eu_2O_3 glasses
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作者 Akshatha WAGH Y.RAVIPRAKASH Sudha D.KAMATH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第8期2637-2645,共9页
Frequency and temperature dependent dielectric dispersion of 20PbF2?20TeO2?(60?x)B2O3?xEu2O3(x=0 to 2.5, mole fraction, %) glasses prepared by the melt?quenching technique were investigated in the frequency r... Frequency and temperature dependent dielectric dispersion of 20PbF2?20TeO2?(60?x)B2O3?xEu2O3(x=0 to 2.5, mole fraction, %) glasses prepared by the melt?quenching technique were investigated in the frequency range 1 Hz?10 MHz and temperature range 313?773 K. Dielectric relaxation dynamics was analyzed based on the electric modulus behavior. Dielectric losses (tanδ) are found to be negligibly small in the temperature range 313?523 K, proving good thermal stability of the glasses. The present Eu2O3-doped oxyfluroborate glasses showed low dielectric loss at higher frequency and lower temperature, proving their suitability for nonlinear optical materials. 展开更多
关键词 doped glass dielectric spectroscopy electric modulus AC conductivity activation energy Arrhenius equation
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Laser-induced Fluorescence Excitation Spectrum of NiS in 15500-17200 cm^-1
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作者 Jun-feng Zhen Li Wang +2 位作者 Cheng-bing Qin Qun Zhang Yang Che 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第6期668-672,J0002,I0003,共7页
The laser-induced fluorescence excitation spectrum of jet-cooled NiS molecule has been recorded in the energy range of 15500 17200 cm-1. Fifteen bands have been assigned as three transition progressions:[15.65]^3Ⅱ1... The laser-induced fluorescence excitation spectrum of jet-cooled NiS molecule has been recorded in the energy range of 15500 17200 cm-1. Fifteen bands have been assigned as three transition progressions:[15.65]^3Ⅱ1(v′=0-4)-X^3∑0^-(v″=0),[15.69]^3∑0^-(v′=0-4)-X^3∑0^-(v″=0),and [15.81]^3Ⅱ1(v′=0-4)-X^3∑0^-(v″=0).Spectroscopic constants for the three newly identified electronically excited states have been determined for the first time. In addition,the lifetimes for most observed vibronic bands have also been measured. 展开更多
关键词 NIS Laser-induced fluorescence spectrum DC discharge
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Effect of Sample Temperature on Radiation Characteristics of Nanosecond Laser-Induced Soil Plasma
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作者 Li Wang Yu Zhou +3 位作者 Yuan-xia Fu Li Xu Hao Gong Rong-long 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第6期760-764,I0003,共6页
An Nd:YAG single pulse nanosecond laser of 532 nm wavelength with an 8 ns pulse width was projected on the soil samples collected from the campus of Bengbu College under 1 standard atmospheric pressure. Laser-induced ... An Nd:YAG single pulse nanosecond laser of 532 nm wavelength with an 8 ns pulse width was projected on the soil samples collected from the campus of Bengbu College under 1 standard atmospheric pressure. Laser-induced breakdown spectroscopy at different sample temperatures was achieved. The intensity and signal-to-noise ratio (SNR) changes of different characteristic spectral lines could be analyzed when the sample temperature changes.The evolution of plasma electron temperature and electron density with the sample temperature was analyzed through Boltzmann oblique line method and Stark broadening method.The cause of the radiation enhancement of laser-induced metal plasma was discussed. Experimental results demonstrated that the spectral intensity, SNR, the electron temperature and electron density of plasma are positively related to the sample temperature, and reach saturation at 100℃. 展开更多
关键词 Sample temperature Spectral intensity Signal-to-noise ratio SOIL Electron temperature Electron density Laser-induced breakdown spectroscopy
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Surface Structure, Spectroscopic and Photocatalytic Activity Study of Polyaniline/TiO2 Nanocomposites
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作者 Maksim Zagorny Igor Bykov +5 位作者 Andrey Melnyk Tatyana Lobunets Alexander Zhygotsky Anatoliy Pozniy Alexander Shirokov Andrey Ragulya 《Journal of Chemistry and Chemical Engineering》 2014年第2期118-127,共10页
PANI (polyaniline) as a promising conducting polymer and photosensitizer has been used to prepare PANI/TiO2 (polyaniline/TiO2) nanocomposite as photocatalyst. TiO2 nanoparticles with size of 5-100 nm were encapsul... PANI (polyaniline) as a promising conducting polymer and photosensitizer has been used to prepare PANI/TiO2 (polyaniline/TiO2) nanocomposite as photocatalyst. TiO2 nanoparticles with size of 5-100 nm were encapsulated by PANI via the "in situ" polymerization of aniline on the surface of TiO2 nanoparticles. IR, SEM, EPR techniques were used to characterize the mechanism of electron interaction in PANI/TiO2 nanocomposite. The resulting PANI-modified TiO2 composites exhibit significantly higher photocatalytic activity than that of neat PANI on degradation of MB (methylen blue) aqueous solution under UV irradiation. 展开更多
关键词 PHOTOCATALYST TiQ nanoparticle POLYANILINE conducting polymer nanocomposite.
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