Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4916341
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Funding
- National Institutes of Health [1DP3 DK101085-01]
- China Scholarship Council [201206250034, 201206200032]
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This letter presents a graphene field effect transistor (GFET) nanosensor that, with a solid gate provided by a high-kappa dielectric, allows analyte detection in liquid media at low gate voltages. The gate is embedded within the sensor and thus is isolated from a sample solution, offering a high level of integration and miniaturization and eliminating errors caused by the liquid disturbance, desirable for both in vitro and in vivo applications. We demonstrate that the GFET nanosensor can be used to measure pH changes in a range of 5.3-9.3. Based on the experimental observations and quantitative analysis, the charging of an electrical double layer capacitor is found to be the major mechanism of pH sensing. (C) 2015 AIP Publishing LLC.
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