Graphene-amplified electrogenerated chemiluminescence of CdTe quantum dots for H2O2 sensing

Luminescence : the Journal of Biological and Chemical Luminescence
Zhonghui WangYi Lv

Abstract

Electrogenerated chemiluminescence (ECL) of thiol-capped CdTe quantum dots (QDs) in aqueous solution was greatly enhanced by PDDA-protected graphene (P-GR) film that were used for the sensitive detection of H2 O2 . When the potential was cycled between 0 and -2.3 V, two ECL peaks were observed at -1.1 (ECL-1) and -1.4 V (ECL-2) in pH 11.0, 0.1 M phosphate buffer solution (PBS), respectively. The electron-transfer reaction between individual electrochemically-reduced CdTe nanocrystal species and oxidant coreactants (H2 O2 or reduced dissolved oxygen) led to the production of ECL-1. While mass nanocrystals packed densely in the film were reduced electrochemically, assembly of reduced nanocrystal species reacted with coreactants to produce an ECL-2 signal. ECL-1 showed higher sensitivity for the detection of H2 O2 concentrations than that of ECL-2. Further, P-GR film not only enhanced ECL intensity of CdTe QDs but also decreased its onset potential. Thus, a novel CdTe QDs ECL sensor was developed for sensing H2O2. Light intensity was linearly proportional to the concentration of H2 O2 between 1.0 × 10(-5) and 2.0 x 10(-7) mol L(-1) with a detection limit of 9.8 x 10(-8) mol L(-1). The P-GR thin-film modified glassy carbon electrod...Continue Reading

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Citations

Feb 6, 2014·Scientific Reports·Guiqing WenZhiliang Jiang
Jul 6, 2013·Materials Science & Engineering. C, Materials for Biological Applications·Małgorzata Geszke-Moritz, Michał Moritz
Apr 27, 2016·Analytical and Bioanalytical Chemistry·Rebekah RussellLynn Dennany
Feb 19, 2013·Luminescence : the Journal of Biological and Chemical Luminescence·Tao LiuYi Lv
Jan 29, 2019·Luminescence : the Journal of Biological and Chemical Luminescence·Huifeng XuGuonan Chen
Jun 28, 2019·Luminescence : the Journal of Biological and Chemical Luminescence·Fang Xin HuQianghai Rao
Sep 21, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Ke Li LinCheng Zhi Huang
May 27, 2020·Luminescence : the Journal of Biological and Chemical Luminescence·Mingxia SunYi Lv
Oct 4, 2018·Analytical Chemistry·Alasdair J StewartLynn Dennany

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