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Biosensors
Special Issues
Advanced Photoelectrochemical Biosensors
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Advanced Photoelectrochemical Biosensors

A special issue of Biosensors (ISSN 2079-6374). This special issue belongs to the section "Optical and Photonic Biosensors".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 1452

Special Issue Editors

Dr. Yanhu Wang

E-Mail Website
Guest Editor
Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
Interests: functional materials based biosensors; chemiluminescence; electrochemiluminescence; photoelectrochemical biosensors
Dr. Chaomin Gao

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China
Interests: photocatalytic; nanomaterials; biosensors; biomarker detection

Special Issue Information

Dear Colleagues,

Increasing evidence has shown that specific biomarkers are helpful for the early detection, prognosis, and efficient evaluation of cancer. Highly sensitive sensing technologies (based on biomarkers derived from cerebrospinal fluid, blood, saliva, urine, or tissues and organs) can effectively measure and identify changes in clinically meaningful outcomes. Photoelectrochemical (PEC) detection, as a promising and burgeoning technique, has gained much attention in the analytical community by inheriting the advantages of both electrochemical and optical techniques. The photodriven electrochemical response is an essential part of PEC analysis, making it indispensable in amplifying the corresponding PEC signals for sensitive detection. This Special Issue’s, entitled “Advanced Photoelectrochemical Biosensors”, topics include, but are not limited to, the following: design and engineering photoactive materials, label-free and label-based PEC bioassays, PEC sensing devices, and detection modes.

Dr. Yanhu Wang
Dr. Chaomin Gao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Biosensors is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • photoelectrochemical biosensor
  • photoelectrochemical sensing
  • surface sensitization
  • charge separation and transfer
  • heterojunction construction
  • nanostructure engineering
  • photoactive material
  • light harvesting
  • semiconductor
  • environmental pollution
  • food safety
  • biomarker detection

Published Papers (1 paper)

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Research

12 pages, 4804 KiB  
Article
Insights into Chemical Bonds for Eliminating the Depletion Region and Accelerating the Photo-Induced Charge Efficient Separation toward Ultrasensitive Photoelectrochemical Sensing
by Shuai Wang, Haihan Yu, Shenguang Ge, Yanhu Wang, Chaomin Gao and Jinghua Yu
Biosensors 2023, 13(11), 984; https://doi.org/10.3390/bios13110984 - 13 Nov 2023
Viewed by 1242
Abstract
The empty-space-induced depletion region in photoelectrodes severely exacerbates the recombination of electron–hole pairs, thereby reducing the photoelectrochemical (PEC) analytical performance. Herein, the chemical bond that can suppress the potential barrier and overcome the high energy barrier of out-of-plane Ohmic or Schottky contact is [...] Read more.
The empty-space-induced depletion region in photoelectrodes severely exacerbates the recombination of electron–hole pairs, thereby reducing the photoelectrochemical (PEC) analytical performance. Herein, the chemical bond that can suppress the potential barrier and overcome the high energy barrier of out-of-plane Ohmic or Schottky contact is introduced into the PEC sensor to eliminate the depletion region and dramatically promote the separation of electron–hole pairs. Specifically, three-dimensional (3D) hierarchically wheatear-like TiO2 (HWT) nanostructures featuring a large surface area to absorb incident light are crafted as the substrate. The facile carbonized strategy is further employed to engineer the Ti-C chemical bond, serving as the touchstone. The average PL lifetime of HWT-C (4.14 ns) is much shorter than that of the 3D HWT (8.57 ns) due to the promoting effect of the chemically bonded structure on carrier separation. Consequently, the 3D HWT-C covalent photoelectrode (600 μA/cm2) exhibits a 3.6-fold increase in photocurrent density compared with the 3D HWT (167 μA/cm2). Ultimately, the model analyte of the tumor marker is detected, and the linear range is 0.02 ng/mL–100 ng/mL with a detection limitation of 0.007 ng/mL. This work provides a basic understanding of chemical bonds in tuning charge separation and insights on strategies for designing high-performance PEC sensors. Full article
(This article belongs to the Special Issue Advanced Photoelectrochemical Biosensors)
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