Wang, Jianwei Singh, Budhi Park, Jin-Hyung Rathi, Servin Lee, In-yeal Maeng, Sunglyul Joh, Han-Ik Lee, Cheol-Ho Kim, Gil-Ho 2024-01-20T10:02:47Z 2024-01-20T10:02:47Z 2021-09-05 2014-04 0925-4005 https://pubs.kist.re.kr/handle/201004/126930 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&apos;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 (V-pp), 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 V-pp = 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. (C) 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA CARBON NANOTUBES THIN-FILMS NANOPARTICLES REDUCTION Dielectrophoresis of graphene oxide nanostructures for hydrogen gas sensor at room temperature Article 10.1016/j.snb.2013.12.009 1 SENSORS AND ACTUATORS B-CHEMICAL, v.194, pp.296 - 302 SENSORS AND ACTUATORS B-CHEMICAL 194 296 302 scie scopus 000331575400040 2-s2.0-84892752175 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article CARBON NANOTUBES THIN-FILMS NANOPARTICLES REDUCTION Graphene oxide Dielectrophoresis Hydrogen gas sensor