Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 3200 North Cramer Street, Milwaukee, Wisconsin 53211, USA.
ACS Nano. 2011 Feb 22;5(2):1154-64. doi: 10.1021/nn102803q. Epub 2011 Jan 4.
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 NO(2) 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.
由于其出色的物理和化学特性，石墨烯在化学传感和生物传感方面值得评估。我们首先报告了使用背栅场效应晶体管平台制造和表征气体传感器的情况，该平台的导电通道为化学还原的氧化石墨烯（R-GO）。与我们之前报道的热还原氧化石墨烯传感器相比，当暴露于空气中的 100 ppm NO（2）时，这些传感器的响应增加了 360％。然后，我们提出了一种新的信号处理/数据解释方法，该方法解决了（i）具有较长恢复时间的传感设备（例如，这些 R-GO 传感器用于感测气体所需的时间）以及（ii）设备间变化的问题。理论分析说明了在传感设备恢复缓慢且接触电阻不可忽略的情况下使用新的信号处理方法的重要性。我们建议，这里报告的工作（包括传感器信号处理方法和器件制造的固有简单性）是朝着基于石墨烯的化学传感器在实际应用迈出的重要一步。
