材料科学
光电子学
量子点
晶体管
调制(音乐)
薄膜晶体管
薄膜
纳米技术
电压
图层(电子)
电气工程
物理
声学
工程类
作者
Yanting Tang,Bowen Zhou,Jing‐yao Liu,Xinyi Chen,Haizhen Wang,Zhixiang Hu,Rongyu Mao,Yingying Xing,Hua‐Yao Li,Dehui Li,Huan Liu
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2024-12-24
卷期号:10 (1): 320-328
标识
DOI:10.1021/acssensors.4c02517
摘要
Mastering the surface chemistry of quantum dots (QDs) has enabled a remarkable gas-sensing response as well as impressive air stability. To overcome the intrinsic receptor-transducer mismatch of QDs, PbS QDs used as sensitive NO2 receptors are spin-coated on top of a few-layer MoS2 and incorporated into a thin-film transistor (TFT) gas sensor. This architecture enables the separation of the electron transduction function from the chemical reception function. A comparison study through size engineering of QDs combined with TFT device modeling suggests a unique dual-gate modulation related to the capacitance coupling effect of QDs. The favorable increase in sensor output current by 3 orders of magnitude is ascribed to the high mobility of the few-layer MoS2. The optimal sensor exhibits a sensitive (LOD ∼ 0.6 ppb), selective, and recoverable response at room temperature. Because of the dual-gate modulation, the sensor performance is further optimized by varying the gate voltage (a two-fold increase in response to 1 ppm of NO2).
科研通智能强力驱动
Strongly Powered by AbleSci AI