Journal
ANALYTICA CHIMICA ACTA
Volume 853, Issue -, Pages 258-264Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2014.10.021
Keywords
Graphene quantum dot; TiO2 nanoparticle; Synergistic effect; Photoelectrochemical sensor; Dopamine
Categories
Funding
- National Natural Science Foundation of China [21175061, 21375050, 21405063]
- Key Laboratory of Modern Agriculture Equipment and Technology [NZ201109]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [PAPD-2014-37]
- Natural Science Foundation of Jiangsu province [BK20130481]
Ask authors/readers for more resources
We have demonstrated a facile approach for fabricating graphene quantum dots-TiO2 (GQDs-TiO2) nanocomposites by a simple physical adsorption method. Compared with pure GQDs and TiO2 nanoparticles (NPs), the as-prepared GQDs-TiO2 nanocomposites showed enhanced photoelectrochemical (PEC) signal under visible-light irradiation. The photocurrent of GQDs-TiO2/GCE was nearly 30-fold and 12-fold enhancement than that of GQDs/GCE and TiO2/GCE, respectively, which was attributed to the synergistic amplification between TiO2 NPs and GQDs. More interestingly, the photocurrent of GQDs-TiO2 nanocomposites was selectively sensitized by dopamine (DA), and enhanced with the increasing of DA concentration. Further, a new PEC methodology for ultrasensitive determination of DA was developed, which showed linearly enhanced photocurrent by increasing the DA concentration from 0.02 to 105 mu M with a detection limit of 6.7 nM (S/N = 3) under optimized conditions. This strategy opens up a new avenue for the application of GQDs-based nanocomposites in the field of PEC sensing and monitoring. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available