Dielectrophoresis of graphene oxide nanostructures for hydrogen gas sensor at room temperature

Title
Dielectrophoresis of graphene oxide nanostructures for hydrogen gas sensor at room temperature
Authors
Jianwei WangBudhi SinghJin-Hyung ParkServin RathiIn-yeal LeeSunglyul Maeng조한익이철호Gil-Ho Kim
Keywords
Graphene oxide; Dielectrophoresis; Hydrogen gas sensor; Reduced graphene oxide
Issue Date
2014-04
Publisher
Sensors and actuators. B, Chemical
Citation
VOL 194, 296-302
Abstract
Hydrogen gas sensors based on graphene oxide (GO) nanostructures have been fabricated using ac dielectrophoresis (DEP) process. The GO nanostructures synthesized by an improved Hummer's method were first characterized by atomic force microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. GO nanostructures were assembled into gold electrodes using DEP process by varying parameters such as frequency, peak-to-peak voltage (Vpp), and processing time (t). The devices were investigated by scanning electron microscopy, current-voltage measurement, and hydrogen sensing experiment at room temperature. It was found that the optimum DEP parameters that manipulates GO nanostructures in precise manner for hydrogen gas sensing were Vpp = 10 V, frequency = 500 kHz, and t = 30 s. The optimized device was proved to be an effective and better hydrogen gas sensor over a typical drop-dried device with a good sensing response of 5%, fast response time (<90 s), and fast recovery time (<60 s) for 100 ppm hydrogen gas concentration at room temperature.
URI
http://pubs.kist.re.kr/handle/201004/47109
ISSN
09254005
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE