Issue 30, 2019

An ultrasensitive label-free photoelectrochemical sensor based on Ag2O-sensitized WO3/TiO2 acicular composite for AFB1 detection

Abstract

Tungsten trioxide (WO3) nanoplates (NPs) were modified on fluorine-doped SnO2 transparent conductive glass (FTO) electrodes by the wet chemical route, and oriented titanium dioxide (TiO2) nanoprickles were tightly and uniformly synthesized on the surface of WO3 by the chemical bath deposition (CBD) method to obtain the WO3/TiO2 composite. Thereafter, Ag2O nanoparticles were formed on the surface of the WO3/TiO2 composite by an in situ growth method. With glutathione (GSH) as the electron donor and visible-light excitation, the WO3/TiO2/Ag2O composite exhibited a worthwhile photoelectric signal, reaching about 56 μA. Therefore, the label-free PEC sensor was successfully prepared for the supersensitive detection of aflatoxin B1 (AFB1). When the concentration of AFB1 was within 0.005–0.4 ng mL−1, the photocurrents showed a linear downward trend with a detection limit of 1.67 pg mL−1. Moreover, AFB1 was satisfactory in the selectivity tests involving zearalenone (ZEN), vomitoxin (DON), and ochratoxin A (OTA). Furthermore, the PEC sensor exhibited the characteristics of stability and good reproducibility, which has broad application prospects in the detection of other toxic small molecules as well as in the preparation of a photoelectric material.

Graphical abstract: An ultrasensitive label-free photoelectrochemical sensor based on Ag2O-sensitized WO3/TiO2 acicular composite for AFB1 detection

Supplementary files

Article information

Article type
Paper
Submitted
16 شوال 1440
Accepted
09 ذو القعدة 1440
First published
09 ذو القعدة 1440

Anal. Methods, 2019,11, 3890-3897

An ultrasensitive label-free photoelectrochemical sensor based on Ag2O-sensitized WO3/TiO2 acicular composite for AFB1 detection

X. Liu, D. Fan, S. Duan, C. Bao, H. Wang, X. Wang, X. Sun and Q. Wei, Anal. Methods, 2019, 11, 3890 DOI: 10.1039/C9AY01277J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements