Double Photosystems-Based 'Z-Scheme' Photoelectrochemical Sensing Mode for Ultrasensitive Detection of Disease Biomarker Accompanying Three-Dimensional DNA Walker

Analytical Chemistry
Shuzhen LvDianping Tang

Abstract

A new double photosystems-based 'Z-scheme' photoelectrochemical (PEC) sensing platform is designed for ultrasensitive detection of prostate-specific antigen (PSA) by coupling with a three-dimensional (3D) DNA walker. Two photosystems consist of CdS quantum dots (photosystem I; PS I) and BiVO4 photoactive materials (photosystem II; PS II), whereas gold nanoparticles (AuNPs) photodeposited on high-active {010} facets of BiVO4 are used as the electron mediators to promote electron transfer from conduction band of PS II to valence band of PS I. 3D DNA walker-based amplification strategy is carried out between hairpin DNA1 conjugated onto the AuNP, hairpin DNA2 labeled with CdS quantum dot (QD-H2), and DNA walker complementary with the PSA aptamer modified to a magnetic bead (Apt-MB). Upon addition of target, DNA walker strand is displaced from DNA walker/Apt-MB to open hairpin DNA1 on AuNP@BiVO4. In the presence of QD-H2, DNA walker induces the hybridization of DNA1 with DNA2 on the gold nanoparticles step by step, thereby resulting in the assembly of CdS QDs on the AuNP@BiVO4 to form Z-scheme double photosystems with strong photocurrent. Under optimum conditions, the Z-scheme PEC sensing system exhibits good photocurrent responses...Continue Reading

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Citations

Jul 10, 2019·Chemistry : a European Journal·Chaoqun WangYi Lv
Mar 13, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Zhenli Qiu, Dianping Tang
Aug 9, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Liwei YangDanny K Y Wong
Nov 7, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Qian Zhou, Dianping Tang
Dec 28, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Ruijin ZengDianping Tang
Oct 22, 2018·Biosensors & Bioelectronics·Meng XuVamsi K Yadavalli
Mar 28, 2021·Biosensors & Bioelectronics·Yahui WangTianli Yue
Dec 11, 2019·Talanta·Ruchita ShandilyaPradyumna Kumar Mishra
Jul 15, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Sheng ZhangHua Wang

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