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Recent Advances in Photoelectrochemical Sensors
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Recent Advances in Photoelectrochemical Sensors

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 2114

Special Issue Editors

Dr. Jian Wang

E-Mail Website
Guest Editor
Department of Biophysics, School of Basic Medical Sciences, Xi’an Jiaotong University, Xi’an 710061, China
Interests: photoelectrochemistry; single-cell imaging; multiplexed sensing; biosensors; semiconductors; spatial resolution; light-addressable electrochemical sensors
Dr. Liping Du

E-Mail Website
Guest Editor
Institute of Medical Engineering, School of Basic Medical Sciences, Xi’an Jiaotong University, Xi’an 710061, China
Interests: chemical sensors; biomimetic olfactory biosensors; odor discrimination; bioelectronic nose; olfac-tory organoid
Special Issues, Collections and Topics in MDPI journals
Dr. Wei Chen

E-Mail Website
Guest Editor
Department of Biophysics, School of Basic Medical Sciences, Xi’an Jiaotong University, Xi’an, China
Interests: biosensors; bacterial cellulose; polymer composite; electrochemical sensors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Photoelectrochemical (PEC) sensing is an analytical technique that combines the principles of photoelectrochemistry and traditional sensing methods to detect and quantify bio(chemical) substances. It leverages the interaction between light and materials to generate an electrical signal, which is correlated with the concentration of the analyte. PEC sensors typically involve a photoactive material, such as a semiconductor, that absorbs light and generates charge carriers (electrons and holes). These carriers participate in redox reactions at the electrode surface, thus producing a measurable current. The method offers high sensitivity due to the unique setup consisting of two separate energy forms, that is, using light as the excitation source and electricity as the detection signal. Applications of PEC sensing are diverse, ranging from environmental monitoring and food safety to clinical diagnostics and biochemical analysis.

This Special Issue will cover the system, instruments, methods, and photoactive and bio-sensitive materials used to construct PEC sensors with various bio(chemical) sensing applications, such as investigations of living cells, organoids, or tissues, as well as detections of ions, bio(chemical) molecules, or metabolites.

Dr. Jian Wang
Dr. Liping Du
Dr. Wei Chen
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. Sensors is an international peer-reviewed open access semimonthly 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 2600 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

  • light-addressable electrochemical sensors
  • light addressability
  • photocurrent
  • photoactive materials
  • bio-sensitive materials
  • photoelectrochemistry
  • multiplexed detection
  • bio(chemical) imaging
  • bio(chemical) sensing

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Published Papers (2 papers)

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16 pages, 3466 KiB  
Article
High-Performance Self-Powered Photodetector Enabled by Te-Doped GeH Nanostructures Engineering
by Junting Zhang, Jiexin Chen, Shuojia Zheng, Da Zhang, Shaojuan Luo and Huixia Luo
Sensors 2025, 25(8), 2530; https://doi.org/10.3390/s25082530 - 17 Apr 2025
Viewed by 196
Abstract
Two-dimensional (2D) Xenes, including graphene where X represents C, Si, Ge, and Te, represent a groundbreaking class of materials renowned for their extraordinary electrical transport properties, robust photoresponse, and Quantum Spin Hall effects. With the growing interest in 2D materials, research on germanene-based [...] Read more.
Two-dimensional (2D) Xenes, including graphene where X represents C, Si, Ge, and Te, represent a groundbreaking class of materials renowned for their extraordinary electrical transport properties, robust photoresponse, and Quantum Spin Hall effects. With the growing interest in 2D materials, research on germanene-based systems remains relatively underexplored despite their potential for tailored optoelectronic functionalities. Herein, we demonstrate a facile and rapid chemical synthesis of tellurium-doped germanene hydride (Te-GeH) nanostructures (NSs), achieving precise atomic-scale control. The 2D Te-GeH NSs exhibit a broadband optical absorption spanning ultraviolet (UV) to visible light (VIS), which is a critical feature for multifunctional photodetection. Leveraging this property, we engineer photoelectrochemical (PEC) photodetectors via a simple drop-casting technique. The devices deliver excellent performance, including a high responsivity of 708.5 µA/W, ultrafast response speeds (92 ms rise, 526 ms decay), and a wide operational bandwidth. Remarkably, the detectors operate efficiently at zero-bias voltage, outperforming most existing 2D-material-based PEC systems, and function as self-powered broadband photodetectors. This work not only advances the understanding of germanene derivatives but also unlocks their potential for next-generation optoelectronics, such as energy-efficient sensors and adaptive optical networks. Full article
(This article belongs to the Special Issue Recent Advances in Photoelectrochemical Sensors)
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13 pages, 3459 KiB  
Article
A Photoelectrochemical Biosensor Mediated by CRISPR/Cas13a for Direct and Specific Detection of MiRNA-21
by Yang Zhang, Pei Miao, Jingyuan Wang, Yan Sun, Jing Zhang, Bin Wang and Mei Yan
Sensors 2024, 24(18), 6138; https://doi.org/10.3390/s24186138 - 23 Sep 2024
Viewed by 1524
Abstract
Direct detection of miRNA is currently limited by the complex amplification and reverse transcription processes of existing methods, leading to low sensitivity and high operational demands. Herein, we developed a CRISPR/Cas13a-mediated photoelectrochemical (PEC) biosensing platform for direct and sensitive detection of miRNA-21. The [...] Read more.
Direct detection of miRNA is currently limited by the complex amplification and reverse transcription processes of existing methods, leading to low sensitivity and high operational demands. Herein, we developed a CRISPR/Cas13a-mediated photoelectrochemical (PEC) biosensing platform for direct and sensitive detection of miRNA-21. The direct and specific recognition of target miRNA-21 by crRNA-21 eliminates the need for pre-amplification and reverse transcription of miRNA-21, thereby preventing signal distortion and enhancing the sensitivity and precision of target detection. When crRNA-21 binds to miRNA-21, it activates the trans-cleavage activity of CRISPR/Cas13a, leading to the non-specific cleavage of biotin-modified DNA with uracil bases (biotin-rU-DNA). This cleavage prevents the biotin-rU-DNA from being immobilized on the electrode surface. As a result, streptavidin cannot attach to the electrode via specific biotin binding, reducing spatial resistance and causing a positively correlated increase in the photocurrent response. This Cas-PEC biosensor has good analytical capabilities, linear responses between 10 fM and 10 nM, a minimum detection limit of 9 fM, and an excellent recovery rate in the analysis of real human serum samples. This work presented an innovative solution for detecting other biomarkers in bioanalysis and clinical diagnostics. Full article
(This article belongs to the Special Issue Recent Advances in Photoelectrochemical Sensors)
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