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Special Issue "Graphene-Based Materials for Biomedical and Environmental Applications"

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

Deadline for manuscript submissions: 30 November 2020.

Special Issue Editors

Dr. Stela-Maria Pruneanu
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Guest Editor
National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, RO-400293, Cluj-Napoca, Romania
Interests: graphene; graphene-modified electrodes; electrochemical detection of biomolecules
Special Issues and Collections in MDPI journals
Prof. Dr. Cecilia CRISTEA
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Guest Editor
Analytical Chemistry Department, Faculty of Pharmacy "Iuliu Haţieganu" University of Medicine and Pharmacy 4, Louis Pasteur St., Cluj-Napoca, Cluj 400349, Romania
Interests: electrochemical and optical sensors; graphene; nanomaterials based electrodes; bioanalysis
Special Issues and Collections in MDPI journals
Dr. Mihaela Tertis
Website
Guest Editor
Analytical Chemistry Department, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy 4, Louis Pasteur St., Cluj-Napoca, Cluj 400349, Romania
Interests: analytical chemistry; electrochemistry, electrochemical (bio)sensors; graphene; composite materials for electrode functionalization; biomedical and environmental applications

Special Issue Information

Graphene is a planar sheet of carbon atoms and has numerous advantages compared to other materials in the construction of sensors and biosensors. The large surface area and the easiness in the transfer of electrons make such material highly sensitive towards interface changes, thus contributing to the fabrication of improved sensor/biosensor devices. In addition, graphene can be easily functionalized with various biomolecules (DNA, proteins, peptides) by π–π stacking and hydrophobic interactions or with metal/metal oxide nanoparticles, forming composites desirable in biomedical and environmental applications.

This Special Issue is addressed to all types of sensors/biosensors using graphene and functionalized graphene, designed for biomedical and environmental analysis.

Dr. Stela-Maria Pruneanu
Prof. Dr. Cecilia Cristea
Dr. Mihaela Tertis
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 papers will be 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 2000 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

  • graphene
  • nitrogen-doped graphene
  • sulfur-doped graphene
  • graphene–metal/metal oxide nanoparticle composites
  • sensors
  • biosensors
  • biomedical applications
  • environmental applications

Published Papers (1 paper)

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Research

Open AccessFeature PaperArticle
Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate
Sensors 2020, 20(7), 1815; https://doi.org/10.3390/s20071815 - 25 Mar 2020
Abstract
Three nitrogen-doped graphene samples were synthesized by the hydrothermal method using urea as doping/reducing agent for graphene oxide (GO), previously dispersed in water. The mixture was poured into an autoclave and placed in the oven at 160 °C for 3, 8 and 12 [...] Read more.
Three nitrogen-doped graphene samples were synthesized by the hydrothermal method using urea as doping/reducing agent for graphene oxide (GO), previously dispersed in water. The mixture was poured into an autoclave and placed in the oven at 160 °C for 3, 8 and 12 h. The samples were correspondingly denoted NGr-1, NGr-2 and NGr-3. The effect of the reaction time on the morphology, structure and electrochemical properties of the resulting materials was thoroughly investigated using scanning electron microscopy (SEM) Raman spectroscopy, X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), elemental analysis, Cyclic Voltammetry (CV) and electrochemical impedance spectroscopy (EIS). For NGr-1 and NGr-2, the nitrogen concentration obtained from elemental analysis was around 6.36 wt%. In the case of NGr-3, a slightly higher concentration of 6.85 wt% was obtained. The electrochemical studies performed with NGr modified electrodes proved that the charge-transfer resistance (Rct) and the apparent heterogeneous electron transfer rate constant (Kapp) depend not only on the nitrogen doping level but also on the type of nitrogen atoms found at the surface (pyrrolic-N, pyridinic-N or graphitic-N). In our case, the NGr-1 sample which has the lowest doping level and the highest concentration of pyrrolic-N among all nitrogen-doped samples exhibits the best electrochemical parameters: a very small Rct (38.3 Ω), a large Kapp (13.9 × 10−2 cm/s) and the best electrochemical response towards 8-hydroxy-2′-deoxyguanosine detection (8-OHdG). Full article
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