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Title: Long-term stability assessment of AlGaN/GaN field effect transistors modified with peptides: Device characteristics vs. surface properties

AlGaN/GaN Field Effect Transistors (FETs) are promising biosensing devices. Functionalization of these devices is explored in this study using an in situ approach with phosphoric acid etchant and a phosphonic acid derivative. Devices are terminated on peptides and soaked in water for up to 168 hrs to examine FETs for both device responses and surface chemistry changes. Measurements demonstrated threshold voltage shifting after the functionalization and soaking processes, but demonstrated stable FET behavior throughout. X-ray photoelectron spectroscopy and atomic force microscopy confirmed peptides attachment to device surfaces before and after water soaking. Results of this work point to the stability of peptide coated functionalized AlGaN/GaN devices in solution and support further research of these devices as disposable, long term, in situ biosensors.
Authors:
; ; ; ;  [1]
  1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695 (United States)
Publication Date:
OSTI Identifier:
22492337
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 9; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM COMPOUNDS; ATOMIC FORCE MICROSCOPY; ELECTRIC POTENTIAL; FIELD EFFECT TRANSISTORS; GALLIUM NITRIDES; INTERFACES; PEPTIDES; PHASE STABILITY; PHOSPHONIC ACIDS; PHOSPHORIC ACID; SURFACE PROPERTIES; SURFACES; WATER; X-RAY PHOTOELECTRON SPECTROSCOPY