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Chemosensors
Special Issues
Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures
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Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Applied Chemical Sensors".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 11659

Special Issue Editor

Prof. Dr. Gang Lu

E-Mail Website
Guest Editor
Institute of Advanced Materials, Nanjing Tech University, Nanjing, China
Interests: surface-enhanced Raman scattering; molecular detection; plasmon-enhanced photochemistry

Special Issue Information

Dear Colleagues,

Surface plasmon is a unique optical phenomenon and has been widely used in chemical and biological sensing. By utilizing plasmonic nanostructures in various sensing platforms, high sensitivity and high selectivity can be realized in the sensing of many molecular compounds and biological substances. Therefore, the field of plasmonic nanostructure-based sensing has been growing rapidly.

The Special Issue will provide a forum for the latest research activities in the field of plasmonic nanostructure-based chemical and biological sensing. We welcome both review and research articles in, not limited to, following topics.

  • New concepts of bio-chemical sensors based on plasmonic nanostructures;
  • New sensing mechanisms based on plasmonic nanostructures;
  • New plasmonic materials/nanostructures for bio-chemical sensing;
  • Techniques to fabricate the sensing platforms based on plasmonic nanostructures;
  • Integration of plasmonic nanostructures with other sensing platforms;
  • Applications of plasmonic nanostructure-based sensors.

Due to the unique properties of surface plasmon, various plasmonic nanostructures have been utilized in the sensing of molecular compounds and biological substances with very high sensitivity and sometimes high selectivity. In addition, many new sensing mechanisms have been developed based on plasmonic nanostructures. Therefore, this Special Issue will be a perfect fit in the journal of Chemosensors.

Prof. Dr. Gang Lu
Guest Editor

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. Chemosensors 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

  • New concepts of bio-chemical sensors based on plasmonic nanostructures;
  • New sensing mechanisms based on plasmonic nanostructures;
  • New plasmonic materials/nanostructures for bio-chemical sensing;
  • Techniques to fabricate the sensing platforms based on plasmonic nanostructures;
  • Integration of plasmonic nanostructures with other sensing platforms;
  • Applications of plasmonic nanostructure-based sensors

Published Papers (5 papers)

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Research

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12 pages, 1754 KiB  
Article
Exploiting the Advantages of Ag/ITO/Enzyme Trapped Gel Layers to Develop a Highly Sensitive and Selective Fiber Optic Plasmonic Urea Sensor
by Sonika Sharma and Satyendra K. Mishra
Chemosensors 2023, 11(8), 421; https://doi.org/10.3390/chemosensors11080421 - 26 Jul 2023
Cited by 8 | Viewed by 1262
Abstract
The fabrication and characterization of a surface plasmon resonance (SPR)-based urea biosensor, with thin silver (Ag), ITO (In2O3: SnO2), and enzyme-trapped gel over an unclad portion of plastic-clad silica fiber as a sensing element, is represented. The [...] Read more.
The fabrication and characterization of a surface plasmon resonance (SPR)-based urea biosensor, with thin silver (Ag), ITO (In2O3: SnO2), and enzyme-trapped gel over an unclad portion of plastic-clad silica fiber as a sensing element, is represented. The working principle is to identify changes in the refractive index of the enzyme (urease) entrapped gel layer following the interaction with the incoming analyte. This interaction causes swelling and shrinkage of the gel layer, which alters the effective refractive index of the sensing layer. The wavelength interrogation method is used, and the optimized sensor probe is characterized by urea samples having different pH values. Scanning electron microscopy confirmed the uniformity of the silver layer over the unclad core of the fiber. The sensor operates from 0 to 160 mM of urea concentrations to cover the physiological concentration range of blood urea normally present in the human body. The sensitivity and limit of detection (LOD) offered by the sensor are marked 0.59387 nm/mM near zero concentration of the urea sample and 0.56 mM, respectively, along with the provisions of high stability, remote sensing, and online monitoring of urea. The proposed sensor has proven to be one of a kind due to its fast response time. Full article
(This article belongs to the Special Issue Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures)
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6 pages, 1409 KiB  
Communication
A Turn-Off Fluorescent Strategy for Calprotectin Detection Based on the Inhibitory Effect of Calprotectin upon the Activity of Zn(Ⅱ)-Dependent DNAzyme
by Jingyi Si, Wei Zhou, Da Zhou, Ying Fang, Xizhong Shen and Changfeng Zhu
Chemosensors 2022, 10(12), 495; https://doi.org/10.3390/chemosensors10120495 - 22 Nov 2022
Cited by 1 | Viewed by 1121
Abstract
Calprotectin (CP) is an established biomarker that allows the noninvasive evaluation of inflammation levels in the gastrointestinal tract of patients with inflammatory bowel disease and is helpful for the diagnosis and management of the disease. Herein, we demonstrate that CP can effectively suppress [...] Read more.
Calprotectin (CP) is an established biomarker that allows the noninvasive evaluation of inflammation levels in the gastrointestinal tract of patients with inflammatory bowel disease and is helpful for the diagnosis and management of the disease. Herein, we demonstrate that CP can effectively suppress the activity of 17E DNAzyme (17E) by chelating Zn(Ⅱ), which is the cofactor of 17E. As the inhibition efficiency of CP on the DNAzyme is proportional to the concentration of CP, the detection of CP can be readily achieved by assessing the activity of 17E. Full article
(This article belongs to the Special Issue Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures)
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11 pages, 2419 KiB  
Article
Plasmonic Sensing of Glucose Based on Gold–Silver Core–Shell Nanoparticles
by Junjie Wang, Xiaoping Yue, Yulong Zhang, Chengcheng Zhu, Xing Kang, Hai-Dong Yu and Gang Lu
Chemosensors 2022, 10(10), 404; https://doi.org/10.3390/chemosensors10100404 - 8 Oct 2022
Cited by 5 | Viewed by 1878
Abstract
Developing a simple and convenient approach for glucose sensing is crucially important in disease diagnosis and health monitoring. In this work, a glucose sensor based on plasmonic nanostructures was developed using gold–silver core–shell nanoparticles as the sensing platform. Based on the oxidative etching [...] Read more.
Developing a simple and convenient approach for glucose sensing is crucially important in disease diagnosis and health monitoring. In this work, a glucose sensor based on plasmonic nanostructures was developed using gold–silver core–shell nanoparticles as the sensing platform. Based on the oxidative etching of the silver shell, the concentration of hydrogen peroxide and glucose could be determined quantitatively via the spectral change. This spectral change could also be observed with the naked eye or with a phone camera, realizing colorimetric sensing. To demonstrate this, glucose solutions at different concentrations were quantitatively detected in a wide concentration range of 0–1.0 mM using this colorimetric sensor. Importantly, shell thickness could significantly affect the sensitivity of our colorimetric sensor. This work provides a deeper understanding of the plasmonic sensing of glucose, which will help to realize its real applications. Based on this strategy, the non-invasive sensing of metabolites may be realized for disease diagnosis and health monitoring. Full article
(This article belongs to the Special Issue Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures)
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Review

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29 pages, 4093 KiB  
Review
Plasmonic Nanosensors and Metasensors Based on New Physical Mechanisms
by Qiaoyu Li, Xiongbin Wu and Yongjin Zhou
Chemosensors 2022, 10(10), 397; https://doi.org/10.3390/chemosensors10100397 - 29 Sep 2022
Cited by 1 | Viewed by 1847
Abstract
Plasmonics can bind light to their surface while increasing its intensity. The confinement and enhancement of light allows high–density, independent, subwavelength sensor elements to be constructed in micrometer–sized arrays. Plasmonic nanostructures have been widely used in the sensing field because of their fast, [...] Read more.
Plasmonics can bind light to their surface while increasing its intensity. The confinement and enhancement of light allows high–density, independent, subwavelength sensor elements to be constructed in micrometer–sized arrays. Plasmonic nanostructures have been widely used in the sensing field because of their fast, real–time and label–free characteristics. Numerous plasmonic metasensors have been configured for next–generation technologies since the emergence of metamaterials and metasurfaces. Among these applications, the development of high–sensitivity sensors based on new physical mechanisms has received tremendous interest recently. This review focuses on high–sensitivity plasmonic nanosensors and metasensors based on new physical mechanisms, especially based on Fano resonance and the exceptional point (EP). The asymmetric Fano resonance generated by the interference of different resonance modes has a narrower bandwidth, while an EP occurs whenever two resonant modes coalesce both in their resonant frequency and their rate of decay or growth. Both physical mechanisms could tremendously improve the sensitivity of the plasmonic sensors. We summarize the working principles, the latest development status and the development trends of these plasmonic nanosensors and metasensors. It is believed that these new sensing mechanisms can inspire more fruitful scientific research. Full article
(This article belongs to the Special Issue Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures)
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34 pages, 41037 KiB  
Review
How Surface-Enhanced Raman Spectroscopy Could Contribute to Medical Diagnoses
by Aleksandra Szaniawska, Kinga Mazur, Dominika Kwarta, Edyta Pyrak and Andrzej Kudelski
Chemosensors 2022, 10(5), 190; https://doi.org/10.3390/chemosensors10050190 - 19 May 2022
Cited by 5 | Viewed by 3865
Abstract
In the last decade, there has been a rapid increase in the number of surface-enhanced Raman scattering (SERS) spectroscopy applications in medical research. In this article we review some recent, and in our opinion, most interesting and promising applications of SERS spectroscopy in [...] Read more.
In the last decade, there has been a rapid increase in the number of surface-enhanced Raman scattering (SERS) spectroscopy applications in medical research. In this article we review some recent, and in our opinion, most interesting and promising applications of SERS spectroscopy in medical diagnostics, including those that permit multiplexing within the range important for clinical samples. We focus on the SERS-based detection of markers of various diseases (or those whose presence significantly increases the chance of developing a given disease), and on drug monitoring. We present selected examples of the SERS detection of particular fragments of DNA or RNA, or of bacteria, viruses, and disease-related proteins. We also describe a very promising and elegant ‘lab-on-chip’ approach used to carry out practical SERS measurements via a pad whose action is similar to that of a pregnancy test. The fundamental theoretical background of SERS spectroscopy, which should allow a better understanding of the operation of the sensors described, is also briefly outlined. We hope that this review article will be useful for researchers planning to enter this fascinating field. Full article
(This article belongs to the Special Issue Advanced Bio-Chemical Sensors Based on Plasmonic Nanostructures)
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