Journal
ACS NANO
Volume 3, Issue 2, Pages 301-306Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn800593m
Keywords
hydrazine; micro hot plate; nitrogen dioxide; ammonia; 2,4-dinitrotoluene
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Funding
- National Science Foundation [DMR 0507294]
- Microelectronics Advanced Research Corp. FCRP FENA Center
- Aerospace Corporation's Independent Research and Development Program
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We report the development of useful chemical sensors from chemically convened graphene dispersions using spin coating to create single-layer films on interdigitated electrode arrays. Dispersions of graphene in anhydrous hydrazine are formed from graphite oxide. Preliminary results are presented on the detection of NO2, NH3, and 2,4-dinitrotoluene using this simple and scalable fabrication method for practical devices. Current versus voltage curves are linear and ohmic in all cases, studied independent of metal electrode or presence of analytes. The sensor response is consistent with a charge transfer mechanism between the analyte and graphene with a limited role of the electrical contacts. A micro hot plate sensor substrate is also used to monitor the temperature dependence of the response to nitrogen dioxide. The results are discussed in light of
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