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Graphene Composites: Optoelectronic Properties and Applications in Chemical Sensing

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 28 February 2025 | Viewed by 764

Special Issue Editors

School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
Interests: functional polymer; polymer composites; sensing; graphene
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Guest Editor
Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Singapore
Interests: polymers; thin films and nanotechnology; nanomaterials; material characterization

Special Issue Information

Dear Colleagues,

Graphene composites have received widespread attention in the field of chemical sensing due to their excellent electron mobility, large surface area, high optical transparency, and excellent mechanical strength. This special issue aims to provide new insights and achievements on graphene-based chemical sensors, which are not limited to changes in physical and chemical properties of light or electricity.

Due to graphene’s high electronic conductivity and surface reactivity, its application scenarios are widely found in biomolecules, such as glucose, cholesterol, DNA, proteins, etc; environmental pollutants, such as heavy metals, organic compounds, pH changes in water sources, and trace amounts of explosives; monitoring levels of various medications to help health professionals tailor appropriate drug dosages to patients.

All these applications of graphene composites in chemical sensing are not exhaustive and are growing as research advances in the field continue to reveal new discoveries of potential uses.

Dr. Hong Chi
Dr. FuKe Wang
Guest Editors

Manuscript Submission Information

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Keywords

  • graphene
  • composites
  • nanomaterials
  • chemical sensing

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Published Papers (1 paper)

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Research

13 pages, 2143 KiB  
Article
Evolution of Oxygen Content of Graphene Oxide for Humidity Sensing
by Xue Zhang, Guocheng Zhang, FuKe Wang and Hong Chi
Molecules 2024, 29(16), 3741; https://doi.org/10.3390/molecules29163741 - 7 Aug 2024
Viewed by 632
Abstract
Graphene oxide (GO) has shown significant potential in humidity sensing. It is well accepted that the oxygen-containing functional groups in GO significantly influence its humidity sensing performance. However, the relationship between the content of these groups and the humidity sensing capability of GO-based [...] Read more.
Graphene oxide (GO) has shown significant potential in humidity sensing. It is well accepted that the oxygen-containing functional groups in GO significantly influence its humidity sensing performance. However, the relationship between the content of these groups and the humidity sensing capability of GO-based sensors remains unclear. In the present work, we investigate the role of oxygen-containing functional groups in the humidity sensing performance by oxidizing graphite with mesh numbers 80–120, 325, and 8000 using the Hummers method, resulting in GO-80, GO-325, and GO-8000. Infrared spectroscopy (IR) and X-ray photoelectron spectroscopy (XPS) were used to identify the types and quantification of oxygen-containing functional groups. Molecular dynamics simulation is used to simulate the adsorption energy, intercalation dynamics, and hydrogen bonding of water molecules. Electrochemical tests were used to compare the adsorption/desorption time and response sensitivity of graphene oxide to humidity. It is proposed that hydroxyl and carboxyl groups are the main contributing groups to humidity sensing. GO-8000 shows a relatively fast response time, but the large number of carboxyl groups will hinder intercalation of water molecules, thus exhibiting lower sensitivity. This research provides a reference for the future development of graphene-based sensors, catalysts, and environmental materials. Full article
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