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Journal of Nanomaterials
Volume 2016 (2016), Article ID 5849018, 6 pages
http://dx.doi.org/10.1155/2016/5849018
Research Article

Synthesis and Characterization of Polymeric Graphene Quantum Dots Based Nanocomposites for Humidity Sensing

1University of Engineering and Technology, Vietnam National University Hanoi, 144 Xuan Thuy, Hanoi 10000, Vietnam
2Ho Chi Minh City Vocational College, 38 Tran Khanh Du, District 1, Ho Chi Minh City 10001, Vietnam
3University of Natural Science, Vietnam National University, Ho Chi Minh City, 227 Nguyen Van Cu Road, District 5, Ho Chi Minh City 10001, Vietnam

Received 22 January 2016; Accepted 27 March 2016

Academic Editor: Mingqiang Li

Copyright © 2016 Lam Minh Long et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Graphene quantum dots (GQDs) were synthesized and incorporated with polyethylenedioxythiophene:poly(4-styrenesulfonate) (PEDOT:PSS) and carbon nanotube (CNT) to form a composite that can be used for humidity sensors. The 600 nm thick composite films contained bulk heterojunctions of CNT/GQD and CNT/PEDOT:PSS. The sensors made from the composites responded well to humidity in a range from 60 to 80% at room temperature and atmospheric pressure. With a CNT content of 0.4 wt.% (GPC-1) to 0.8 wt.% (GPC-2) and 1.2 wt.% (GPC-3), the sensitivity of the humidity sensing devices based on CNT-doped graphene quantum dot-PEDOT:PSS composites was increased from 4.5% (GPC-1) to 9.0% (GPC-1) and 11.0% (GPC-2), respectively. The fast response time of the GPC sensors was about 20 s and it was much improved due to CNTs doping in the composites. The best value of the recovery time was found to be of 40 s, for the GPC composite film doped with 1.2 wt.% CNT content.