School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China.
Nanoscale. 2013 Feb 7;5(3):1153-8. doi: 10.1039/c2nr32641h. Epub 2013 Jan 4.
The near-infrared photoresponse of a single suspended carbon nanocoil (CNC) is investigated. Under the irradiation of a 785 nm laser beam, the photoresponse is generated in the voltage-biased CNC. At a voltage of 50 mV, the ratio of the conductance change to the initial conductance, which is defined as the sensitivity in this paper, can reach 22% and the typical response time is 5 ms. It is found from the changes of photoresponse with pressure and with the laser power that the photoresponse of the CNC is mainly attributed to the bolometric effect. Because of the increase of Joule heating, the sensitivity reduces with the elevation of the bias voltage. However, the responsivity increases with the increase of the bias voltage, which is opposite to the change of the sensitivity. The maximum responsivity of the single CNC IR sensor is 0.22 A W(-1).
研究了单个悬空碳纳米线圈（CNC）的近红外光响应。在 785nm 激光束的辐照下，在偏置电压的 CNC 中产生光响应。在 50mV 的电压下，电导变化与初始电导的比值，即本文定义的灵敏度可达 22%，典型的响应时间为 5ms。通过光响应随压力和激光功率的变化发现，CNC 的光响应主要归因于量热效应。由于焦耳加热的增加，灵敏度随偏置电压的升高而降低。然而，响应度随偏置电压的增加而增加，这与灵敏度的变化相反。单个 CNC 红外传感器的最大响应率为 0.22AW(-1)。
