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Room temperature pH-dependent ammonia gas sensors using graphene quantum dots

Title
Room temperature pH-dependent ammonia gas sensors using graphene quantum dots
Author
김태환
Keywords
Graphene quantum dots; MWCNTs; Ammonia gas sensor
Issue Date
2016-01
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 222, Page. 763-768
Abstract
We report a simple solution-process route to realize ammonia (NH3) gas sensor based on graphene quantum dots (GQDs). Transmission electron microscopy analysis confirmed that the 8-10nm GQDs were formed from multi-walled carbon nanotubes by using ultrasonication treatment. The as-fabricated gas sensor showed promising selectivity response when expose to NH3 ambient at room temperature. It is indicated that by adjusting the pH value of the aqueous GQDs in acidic and neutral, two types of gas sensors with contrary current responses could be obtained, which might be resulted from quantum confinement, edge effects and presence of functional groups on GQDs. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0925400515303099?via%3Dihubhttp://hdl.handle.net/20.500.11754/31476
ISSN
0925-4005
DOI
10.1016/j.snb.2015.09.002
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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