Toward Practical Gas Sensing with Highly Reduced Graphene Oxide: A New Signal Processing Method To Circumvent Run-to-Run and Device-to-Device Variations
Toward Practical Gas Sensing with Highly Reduced Graphene Oxide: A New Signal Processing Method To Circumvent Run-to-Run and Device-to-Device Variations
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DOI：
10.1021/nn102803q
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发表时间：
2011-02-01
期刊：
影响因子：
17.1
通讯作者：
Chen, Junhong
中科院分区：
文献类型：
--
作者：
Lu, Ganhua;Park, Sungjin;Chen, Junhong
石墨烯具有优异的物理化学性质，在化学传感和生物传感方面具有重要的应用价值。我们首先报道了使用化学还原氧化石墨烯(R-GO)作为导电通道的背栅极场效应晶体管平台的气体传感器的制备和表征。这些传感器在空气中暴露在100ppm的NO2中时，与我们之前报道的热还原氧化石墨烯传感器相比，响应增加了360%。然后，我们提出了一种新的信号处理/数据解释方法，它解决了(I)具有长恢复周期的感测设备(如使用这些R-GO传感器感测气体所需的)以及(Ii)设备到设备的差异。通过理论分析，说明了在传感器件恢复缓慢和接触电阻不可忽略的情况下，采用新的信号处理方法的重要性。我们认为，本文所报道的工作(包括传感器信号处理方法和器件制造的固有简单性)是迈向石墨烯化学传感器实际应用的重要一步。
Graphene is worth evaluating for chemical sensing and biosensing due to its outstanding physical and chemical properties. We first report on the fabrication and characterization of gas sensors using a back-gated field-effect transistor platform with chemically reduced graphene oxide (R-GO) as the conducting channel. These sensors exhibited a 360% increase in response when exposed to 100 ppm NO2 in air, compared with thermally reduced graphene oxide sensors we reported earlier. We then present a new method of signal processing/data interpretation that addresses (i) sensing devices with long recovery periods (such as required for sensing gases with these R-GO sensors) as well as (ii) device-to-device variations. A theoretical analysis is used to Illuminate the importance of using the new signal processing method when the sensing device suffers from slow recovery and non-negligible contact resistance. We suggest that the work reported here (including the sensor signal processing method and the Inherent simplicity of device fabrication) Is a significant step toward the real-world application of graphene-based chemical sensors.