Journal
BIOSENSORS & BIOELECTRONICS
Volume 41, Issue -, Pages 103-109Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2012.07.059
Keywords
Label-free detection; Liquid-gated transistors; DNA sensing; CVD graphene; Gold-transfer method
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Funding
- National Science Council Taiwan [NSC-99-2112-M-001-021-MY3, 99-2738-M-001-001]
- Academia Sinica (IAMS)
- NCTU Taiwan
- Academia Sinica (Nano program)
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The high transconductance and low noise of graphene-based field-effect transistors based on large-area monolayer graphene produced by chemical vapor deposition are used for label-free electrical detection of DNA hybridization. The gate materials, buffer concentration and surface condition of graphene have been optimized to achieve the DNA detection sensitivity as low as 1 pM (10(-12) M), which is more sensitive than the existing report based on few-layer graphene. The graphene films obtained using conventional PMMA-assisted transfer technique exhibits PMMA residues, which degrade the sensing performance of graphene. We have demonstrated that the sensing performance of the graphene samples prepared by gold-transfer is largely enhanced (by 125%). (C) 2012 Elsevier B.V. All rights reserved.
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