Issue 46, 2018

Fluorescence enhancement of carbon dots by graphene for highly sensitive detection of tetracycline hydrochloride

Abstract

In this study, fluorescence of self-assembled multilayers (SAMs) of carbon dots (CDs) was found to be enhanced by graphene. The number of polyelectrolyte layers can be tuned to control the distance between CDs and graphene in SAMs. The enhanced fluorescence efficiency was found to be dependent on graphene concentration, degree of graphene reduction, and the distance between CDs and graphene surface. When graphene concentration and polyelectrolyte bilayer number were set to 0.005 mg mL−1 and 3 layers, respectively, fluorescence intensity of CDs could be increased up to 3.2 times. Tetracycline hydrochloride (Tc) could be detected by the established SAMs in the presence of graphene as the sensitivity was 2 orders higher than that of SAMs in the absence of graphene. Limit of detection of this sensing system was 0.9284 nM, which is 1–3 orders of magnitude lower than those of most of reported fluorescence sensors. This method could be successfully applied to detect trace Tc in milk samples.

Graphical abstract: Fluorescence enhancement of carbon dots by graphene for highly sensitive detection of tetracycline hydrochloride

Supplementary files

Article information

Article type
Paper
Submitted
29 5月 2018
Accepted
03 7月 2018
First published
23 7月 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 26212-26217

Fluorescence enhancement of carbon dots by graphene for highly sensitive detection of tetracycline hydrochloride

W. He, X. Sun, W. Weng and B. Liu, RSC Adv., 2018, 8, 26212 DOI: 10.1039/C8RA04581J

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