多壁碳纳米管/金属异质结的热电效应和红外光电效应  

Thermoelectric and infrared optoelectronic effects in multi-walled carbon nanotube/metal heterojunctions

作　　者：孙家林[1] 

机构地区：[1]清华大学物理系,北京100084

出　　处：《黑龙江大学工程学报》2011年第3期102-106,共5页Journal of Engineering of Heilongjiang University

基　　金：国家自然科学基金项目(No.10711120167);教育部科学技术研究重大项目(No.306020);科技部"973"计划项目(2007CB511904)

摘　　要：在无序多壁碳纳米管(MWCNT)压片的上表面涂敷金属薄层,构成"无序多壁碳纳米管/金属"异质结。通过实验测试,详细研究了该异质结的热电效应和红外光电效应。作为参比实验,同时对前期设计的"有序多壁碳纳米管/金属"异质结的热电效应和红外光电效应进行了同样测量。结果表明:在两种异质结中,其热致电流和红外光致电流都具有相同的流向。当采用CO2激光(λ=10.6μm)辐照异质结时,"无序多壁碳纳米管/金属"异质结的光致电流强度与光功率呈非线性关系,而在"有序多壁碳纳米管/金属"异质结器件中,光致电流强度与光功率几乎是线性相关的。对于两种异质结,其红外光致电流响应曲线均具有两个特征时间,说明红外光电效应中包含光响应和热响应两种物理过程。此外,基于热电效应和红外光电效应,设计并构建了红外光电传感器和热电传感器原型,为拓展"多壁碳纳米管/金属"异质结的应用奠定了实验基础。Thermoelectric and infrared optoelectronic effects in multi-walled carbon nanotube （MWC- NT） /metal heterojunctions have been investigated. The directions of both the thermoinduced and infrared photoinduced currents in the disordered （or ordered） MWCNT/metal heterojunctions are the same. Moreover, the infrared photoinduced current in the disordered MWCNT/metal heterojunction under the irradiation of a CO2 laser （2 = 10. 6μm） shows a quadratic dependence on the power, while it in the ordered MWCNT/metal heterojunction shows an almost linear dependence. For both junctions, the infrared photoinduced currents have two characteristic response times. Infrared optoelectronic effects are composed of both photoelectric and thermoelectric process. Based on their thermoelectric and infrared optoelectronie effects, the prototypes of infrared optoelectronic and thermoelectric sensors have been constructed for the applications of the MWCNT/metal heterojunctions.

关 键 词：多壁碳纳米管(MWCNT) 异质结 热电效应 红外光电效应 

分 类 号：O469[理学—凝聚态物理]