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Biosensors
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2D Materials (Graphene, Carbon Nitride and MXenes, etc.) Based Advanced...
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2D Materials (Graphene, Carbon Nitride and MXenes, etc.) Based Advanced Functional Catalysts for Biosensor and Biofuel Cell Applications

A special issue of Biosensors (ISSN 2079-6374). This special issue belongs to the section "Biosensor Materials".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 2876

Special Issue Editor

Dr. Khursheed Ahmad

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Yeungnam University, Gyeongsan, Republic of Korea
Interests: 2D materials; sensors; biosensors; photovoltaics; smart windows; electrochromic device
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recently, two dimensional (2D) materials such as graphitic carbon nitride, graphene, transition metal dichalcogenides (TMDs), black phosphorus (phosphorene), and metal carbides/nitrides MXenes have received enormous attention because of their excellent optoelectronic and physiochemical properties. These 2D materials are composed of a single layer or a few layers of atoms arranged in a two-dimensional structure. The high surface area of 2D materials expands their potential applications for various electrochemical-related devices such as energy storage, biosensors, glucose biofuel cells, dye-sensitized solar cells, and hydrogen/oxygen evolution reactions. These 2D materials have been widely used as conductive supports to improve the conductivity and catalytic properties of poorly semiconducting materials. Hybrid composites consisting of 2D materials may have boosted electro-catalytic properties and have been widely used as electro-catalytic materials for the fabrication of biosensors, sensors (of glucose, dopamine, phenol, nitrophenol, hydrazine, urea, ascorbic acid, nitride, hydrogen peroxide, nitrobenzene, biomolecules, and other toxic compounds), and biofuel cells. This Special Issue is focused on 2D materials for sensors, biosensors, biofuel cells, and other electrochemical-related applications. Original research articles (theoretical or experimental) and review articles addressing recent advances in the field of 2D materials-based electrochemical- and energy-related applications are welcome.

Dr. Khursheed Ahmad
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. 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

  • 2D materials
  • graphene
  • titanium carbide
  • dye sensitized solar cells
  • biosensors
  • sensors
  • HER
  • OER
  • biofuel cells
  • electrochemical devices

Published Papers (2 papers)

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Research

13 pages, 6664 KiB  
Article
Fabrication of an Azithromycin Sensor
by Theophile Niyitanga, Mohd Quasim Khan, Khursheed Ahmad and Rais Ahmad Khan
Biosensors 2023, 13(11), 986; https://doi.org/10.3390/bios13110986 - 16 Nov 2023
Viewed by 1299
Abstract
Azithromycin (AZY) is a well-known top-prioritized antibiotic and is used by humans in strong concentrations. However, the side effects of the AZY antibiotic may cause some serious and significant damage to humans and the environment. Thus, there is a need to develop effective [...] Read more.
Azithromycin (AZY) is a well-known top-prioritized antibiotic and is used by humans in strong concentrations. However, the side effects of the AZY antibiotic may cause some serious and significant damage to humans and the environment. Thus, there is a need to develop effective and sensitive sensors to monitor accurate concentrations of AZY. In the last decade, electrochemistry-based sensors have received enormous attention from the scientific community because of their high sensitivity, selectivity, cost-effectiveness, fast response, rapid detection response, simple fabrication, and working principle. It is important to mention that electrochemical sensors rely on the properties of electrode modifiers. Hence, the selection of electrode materials is of great significance when designing and developing efficient and robust electrochemical sensors. In this study, we fabricated an AZY sensor by utilizing a molybdenum disulfide/titanium aluminum carbide (MoS2@Ti3AlC2) composite as the electrode material. The MoS2@Ti3AlC2 composite was synthesized via a simple sonication process. The synthesized MoS2@Ti3AlC2 composite was characterized using a powder X-ray diffraction (XRD) method to examine the phase purity and formation of the MoS2@Ti3AlC2 composite. Scanning electron microscopy (SEM) was used to study the surface morphological features of the prepared MoS2@Ti3AlC2 composite, whereas energy dispersive X-ray spectroscopy (EDAX) was adopted to determine the elemental composition of the prepared MoS2@Ti3AlC2 composite. The glassy carbon (GC) electrode was modified with the prepared MoS2@Ti3AlC2 composite and applied as the AZY sensor. The sensing performance of the MoS2@Ti3AlC2 composite-modified GC electrode was studied using linear sweep voltammetry. The sensor demonstrated excellent performance when determining AZY and showed a good detection limit of 0.009 µM with a sensitivity of 6.77 µA/µM.cm2. Full article
(This article belongs to the Special Issue 2D Materials (Graphene, Carbon Nitride and MXenes, etc.) Based Advanced Functional Catalysts for Biosensor and Biofuel Cell Applications)
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14 pages, 6338 KiB  
Article
MoS2/S@g-CN Composite Electrode for L-Tryptophan Sensing
by Theophile Niyitanga, Aarti Pathak, Archana Chaudhary, Rais Ahmad Khan and Haekyoung Kim
Biosensors 2023, 13(11), 967; https://doi.org/10.3390/bios13110967 - 02 Nov 2023
Viewed by 1286
Abstract
L-tryptophan (L-TRP) is an essential amino acid responsible for the establishment and maintenance of a positive nitrogen equilibrium in the nutrition of human beings. Therefore, it is vital to quantify the amount of L-tryptophan in our body. Herein, we report the MoS2 [...] Read more.
L-tryptophan (L-TRP) is an essential amino acid responsible for the establishment and maintenance of a positive nitrogen equilibrium in the nutrition of human beings. Therefore, it is vital to quantify the amount of L-tryptophan in our body. Herein, we report the MoS2/S@g-CN-modified glassy carbon electrode for the electrochemical detection of L-tryptophan (L-TRP). The MoS2/S@g-CN composite was successfully synthesized using an efficient and cost-effective hydrothermal method. The physical and chemical properties of the synthesized composite were analyzed using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray analysis (EDX). The crystallite size of the composite was calculated as 39.4 nm, with porous balls of MoS2 decorated over the S@g-CN surface. The XPS spectrum confirmed the presence of Mo, S, O, C, and N elements in the sample. The synthesized nanocomposite was further used to modify the glassy carbon (GC) electrode (MoS2/S@g-CN/GC). This MoS2/S@g-CN/GC was used for the electrochemical detection of L-TRP using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. For the purpose of comparison, the effects of the scanning rate and the concentration of L-TRP on the current response for the bare GC, S@g-CN/GC, MoS2/GC, and MoS2/S@g-CN/GC were studied in detail. The MoS2/S@g-CN-modified GC electrode exhibited a rational limit of detection (LoD) of 0.03 µM and a sensitivity of 1.74 µA/ µMcm2, with excellent stability, efficient repeatability, and high selectivity for L-TRP detection. Full article
(This article belongs to the Special Issue 2D Materials (Graphene, Carbon Nitride and MXenes, etc.) Based Advanced Functional Catalysts for Biosensor and Biofuel Cell Applications)
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