Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26651
Title: Photoresponse of polyaniline-functionalized graphene quantum dots
Authors: Lai, SK
Luk, CM
Tang, L
Teng, KS
Lau, SP 
Issue Date: 2015
Publisher: Royal Society of Chemistry
Source: Nanoscale, 2015, v. 7, no. 12, p. 5338-5343 How to cite?
Journal: Nanoscale 
Abstract: Polyaniline-functionalized graphene quantum dots (PANI-GQD) and pristine graphene quantum dots (GQDs) were utilized for optoelectronic devices. The PANI-GQD based photodetector exhibited higher responsivity which is about an order of magnitude at 405 nm and 7 folds at 532 nm as compared to GQD-based photodetectors. The improved photoresponse is attributed to the enhanced interconnection of GQD by island-like polymer matrices, which facilitate carrier transport within the polymer matrices. The optically tunable current-voltage (I-V) hysteresis of PANI-GQD was also demonstrated. The hysteresis magnifies progressively with light intensity at a scan range of ±1 V. Both GQD and PANI-GQD devices change from positive to negative photocurrent when the bias reaches 4 V. Photogenerated carriers are excited to the trapping states in GQDs with increased bias. The trapped charges interact with charges injected from the electrodes which results in a net decrease of free charge carriers and a negative photocurrent. The photocurrent switching phenomenon in GQD and PANI-GQD devices may open up novel applications in optoelectronics.
URI: http://hdl.handle.net/10397/26651
ISSN: 2040-3364
EISSN: 2040-3372
DOI: 10.1039/c4nr07565j
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