Humidity Sensors Realized via Negative Photoconductivity Effect in Nanodiamonds
Jinxu Qin, Xigui Yang, Xigui Yang, Chaofan Lv, Yizhe Li, Xue-Xia Chen, Zhenfeng Zhang, Jinhao Zang, Xun Yang, Xun Yang, Kai-Kai Liu, Lin Dong, Chongxin Shan
Abstract
Herein, the negative photoconductivity (NPC) effect has been observed in nanodiamonds (NDs) for the first time, and with illumination under a 660 nm laser lamp, the conductivity of the NDs decreases significantly. The NPC effect has been attributed to the trapping of carriers by the absorbed water molecules on the ND surfaces. A humidity sensor has been constructed based on the NPC effect of the NDs, and the sensitivity of the sensor can reach 106%, which is the highest value ever reported for carbon-based humidity sensors.
Topics & Concepts
PhotoconductivityHumidityMaterials scienceOptoelectronicsConductivityCarbon fibersChemistryComposite materialPhysicsMeteorologyPhysical chemistryComposite numberDiamond and Carbon-based Materials ResearchAnalytical Chemistry and SensorsGraphene research and applications