AC phase sensing of graphene FETs for chemical vapors with fast recovery and minimal baseline drift
AC phase sensing of graphene FETs for chemical vapors with fast recovery and minimal baseline drift
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DOI：
10.1016/j.snb.2018.01.244
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Huiliang Liu;Yumeng Liu;Yao Chu;Takeshi Hayasaka;Nirav Joshi;Yong Cui;Xiaohao Wang;Zheng You;Liwei Lin
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文献类型：
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作者：
Huiliang Liu;Yumeng Liu;Yao Chu;Takeshi Hayasaka;Nirav Joshi;Yong Cui;Xiaohao Wang;Zheng You;Liwei Lin
这项工作利用化学蒸气的AC相位感测方法来实现石墨烯基场效应晶体管（FET）上的最小基线漂移和快速恢复。在室温下，以化学气相沉积（CVD）石墨烯作为沟道材料制成的缺陷丰富的FET上，以超快的恢复速度（± 10 s）检测沟道电阻和栅极电压之间的相位滞后信号，而没有表面功能化。当暴露于水、甲醇和乙醇蒸气时的相变的响应显示出比常规DC电阻测量快至少十倍的恢复速度，具有最小的基线漂移、大的动态范围和良好的稳定性。研究了相对湿度对甲醇和乙醇气体响应特性的影响。因此，AC相位感测方案可以开辟气体传感器中的一类新的研究，以提高感测速度和基线稳定性。
This work utilizes an AC phase sensing approach of chemical vapors to achieve minimal baseline drift and fast recovery on graphene-based field effect transistors (FETs). Phase lag signals between channel resistance and gate voltage are detected with ultrafast recovery speed (∼10 s) on defect-rich FETs made of chemical vapor deposition (CVD) graphene as the channel materials without surface functionalization at room temperature. The responses of the phase change upon exposure to water, methanol and ethanol vapors show at least ten times faster recovery speed than those of the conventional DC resistance measurements with minimal baseline drift, large dynamic range, and good stability. The effects of relative humidity on methanol and ethanol gas response properties are also studied. As such, the AC phase sensing scheme could open up a new class of research in gas sensors for improved sensing speed and baseline stability.