期刊
IEEE SENSORS JOURNAL
卷 14, 期 5, 页码 1459-1466出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2013.2295302
关键词
Graphene; sensor; wireless; quantum capacitance; varactor
资金
- Minnesota Partnership for Biotechnology and Medical Genomics Decade of Discovery Initiative
- University of Minnesota Nanofabrication and Characterization Facilities through the National Science Foundation
A wireless vapor sensor based on the quantum capacitance effect in graphene is demonstrated. The sensor consists of a metal-oxide-graphene variable capacitor (varactor) coupled to an inductor, creating a resonant oscillator circuit. The resonant frequency is found to shift in proportion to water vapor concentration for relative humidity (RH) values ranging from 1% to 97% with a linear frequency shift of 5.7 kHz/% RH +/- 0.3 kHz/% RH. The capacitance values extracted from the wireless measurements agree with those determined from capacitance-voltage measurements, providing strong evidence that the sensing arises from the variable quantum capacitance in graphene. These results represent a new sensor transduction mechanism and pave the way for graphene quantum capacitance sensors to be studied for a wide range of chemical and biological sensing applications.
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