期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 187, 期 -, 页码 45-49出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.09.033
关键词
Graphene field-effect transistors; Potassium; Sodium; Selective ion sensors; Ionophore; Valinomycin
资金
- New Energy and Industrial Technology Development Organization (NEDO)
- Core Research for Evolutional Science and Technology (CREST) from the Japan Science and Technology Agency (JST)
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [24310105]
- Management Expenses Grants for National University Corporations from MEXT
- Japan Society for the Promotion of Science Core-to-Core Program
Electrolyte-gated graphene field-effect transistors (FETs) were fabricated to demonstrate highly sensitive electrical detection of K or Na ions in a solution. Moreover, selective K ion sensors were fabricated by modifying graphene FETs with valinomycin, a selective K ionophore. The valinomycin-modified graphene FETs demonstrated highly sensitive, selective electrical detection of K ions in electrolytes. The K ions bound to the valinomycin in the graphene channel and affected the electrical potential of the channel. The transfer curves were shifted in a negative direction as the K ion concentration increased, indicating that K ions in solution were effectively detected over a wide concentration range, from 10 nM to 1.0 mM. The addition of Na ions did not cause any change in the transfer characteristics. We have thus demonstrated the potential utility of graphene FETs as highly sensitive, selective K ion sensors. (C) 2012 Elsevier B. V. All rights reserved.
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