V_(2)O_(5)/MWCNT纳米复合薄膜的制备及其光电特性  

Preparation and Photoelectric Properties of V_(2)O_(5)/MWCNT Nanocomposite Films

作　　者：彭玮烨 李毅[1,2] 何伟业 张皓婷 薛畅 王伟[1] 刘红薇 施张庆 PENG Weiye;LI Yi;HE Weiye;ZHANG Haoting;XUE Chang;WANG Wei;LIU Hongwei;SHI Zhangqing(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Modern Optical System,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]上海市现代光学系统重点实验室,上海200093

出　　处：《光子学报》2025年第2期189-198,共10页Acta Photonica Sinica

基　　金：国家高技术研究发展计划(No.2006AA03Z348);教育部科学技术研究重点项目(No.207033);上海市科学技术委员会科技攻关计划(No.06DZ11415);上海市教育委员会科技创新重点项目(No.10ZZ94);上海领军人才培养计划(No.2011-026)。

摘　　要：选用99.99%纯度的V_(2)O_(5)粉末和多壁碳纳米管,采用溶胶凝胶法和后退火工艺在石英基底上制备了V_(2)O_(5)与多壁碳纳米管的纳米复合薄膜。通过场发射扫描电子显微镜、拉曼光谱仪、X射线衍射仪和X射线光电子能谱仪等表征了复合薄膜的表面形貌、结构、化学组成和元素,利用分光光度计等测试分析了复合薄膜的光电特性。结果表明,多壁碳纳米管的掺入使V_(2)O_(5)薄膜的带隙变宽,当温度从室温升至270℃时,其电阻从52.38 MΩ下降到0.97 MΩ,有近两个数量级的变化;在600~1200 nm波长范围内,复合薄膜的平均透过率达58%,相变前后的透过率变化达2%,在0~7 V的电压调控下透过率随电压的增大而升高。复合薄膜经过多次高低温循环测试,其光电特性具有较好的可逆热致光电特性和稳定性,有望在新型光电器件和传感器等领域得以应用。V_(2)O_(5)has the highest oxygen state in vanadium-oxygen systems and is the most stable member of the series of vanadium oxides.V_(2)O_(5)is an n-type semiconductor at room temperature with wide bandgap between 2.2 eV and 2.4 eV,high absorption coefficient,and unique orthorhombic layered structure.Multi-walled carbon nanotubes have unique high mechanical strength,high electrical conductivity,high thermal stability and good electrochemical properties,usually considered as a p-type semiconductor.The synthesis of p-type multi-walled carbon nanotubes with n-type V_(2)O_(5)will form p-n heterojunction,which increases the Schottky barrier,mobility and quantum effect,and can achieve excellent optoelectronic properties which is conducive to the preparation of optoelectronic devices,such as ultra-high-speed switches,high-frequency and high-speed components,and solar cells.Ions have been doped into V_(2)O_(5)thin films to improve their optical and electrical properties,and the results show that doping other elemental ions to fill gaps or replace atoms in the lattice can effectively enhance the optical and electrical properties of thin films by forming additional donors or acceptors to facilitate the interband jumps of the phase transition process.In this paper,V_(2)O_(5)/MWCNT nanocomposite films were prepared on quartz substrates by sol-gel method and post-annealing process due to its advantages of being environmental friendly,inexpensive,and requiring simple fabrication.Firstly,0.5 g V_(2)O_(5)and 0.33 g MWCNT power were progressively added to the 40 ml H2O2 solution at room temperature while the solution was continuously stirred.After stirring for 3 hours,continued stirring in 75℃water bath until the exothermic reaction was complete,the multi-walled carbon nanotubes were ultrasonically dispersed in the solution at a certain molar ratio of V_(2)O_(5)to multi-walled carbon nanotubes for 0.5 hour.The solution was continued to be stirred in the water bath for more than 1 hour until the composite gel was formed.Finally,th

关 键 词：复合薄膜 V_(2)O_(5) 多壁碳纳米管 溶胶凝胶 光电特性 

分 类 号：TB383.2[一般工业技术—材料科学与工程]