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Nanostructures and Nanocomposites for Sensing Application: Biological, Food, and Environmental...
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Nanostructures and Nanocomposites for Sensing Application: Biological, Food, and Environmental Analysis

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 3712

Special Issue Editor

Prof. Dr. Yap Wing Fen

E-Mail Website
Guest Editor
1. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
2. Functional Nanotechnology Devices Laboratory, Institute of Nanoscience and Nanotechnology (ION2), Universiti Putra Malaysia, Serdang 43400, Malaysia
Interests: optical sensor; structural and optical studies; nanomaterials; thin film; surface plasmon resonance
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The study of various nanostructures and nanocomposites for sensing applications has received a tremendous amount of attention from the scientific community in recent years. The incorporation of different nanomaterials with various types of sensors (including biosensors, chemical sensors, physical sensors, and optical sensors) can enhance sensing performance in terms of sensitivity and detection limits. Nanomaterials-based sensors can be applied to various fields, ranging from medical diagnosis to environmental monitoring.

This Special Issue will cover various topics, ranging from synthesis and characterization to sensing application of various types of nanostructures, nanomaterials. or nanocomposites. The Special Issue will cover, but not be limited to, the following sensing applications:

  • Biochemical substances;
  • Virus or bacteria;
  • Medical diagnosis;
  • Biomedicine;
  • Environmental pollutants;
  • Ions;
  • Biomolecules;
  • Organic compounds.

Biosensors, chemical sensors, physical sensors, and optical sensors based on different types of nanomaterials are welcomed.

Prof. Dr. Yap Wing Fen
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. Nanomaterials 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 2900 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

  • quantum dots
  • nanoparticles
  • carbon-based nanostructures
  • biosensors
  • chemical sensors
  • optical sensors
  • gas sensors
  • surface plasmon resonance
  • environmental monitoring
  • biological and food analysis

Published Papers (2 papers)

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Research

17 pages, 8391 KiB  
Article
Structural and Optical Properties of Graphene Quantum Dots−Polyvinyl Alcohol Composite Thin Film and Its Potential in Plasmonic Sensing of Carbaryl
by Nurul Illya Muhamad Fauzi, Yap Wing Fen, Faten Bashar Kamal Eddin and Wan Mohd Ebtisyam Mustaqim Mohd Daniyal
Nanomaterials 2022, 12(22), 4105; https://doi.org/10.3390/nano12224105 - 21 Nov 2022
Cited by 6 | Viewed by 2132
Abstract
In this study, graphene quantum dots (GQDs) and polyvinyl alcohol (PVA) composite was prepared and then coated on the surface of gold thin film via the spin coating technique. Subsequently, Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and ultraviolet-visible spectroscopy (UV–Vis) [...] Read more.
In this study, graphene quantum dots (GQDs) and polyvinyl alcohol (PVA) composite was prepared and then coated on the surface of gold thin film via the spin coating technique. Subsequently, Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and ultraviolet-visible spectroscopy (UV–Vis) were adopted to understand the structure, surface morphology, and optical properties of the prepared samples. The FT-IR spectral analysis revealed important bands, such as O–H stretching, C=O stretching, C-H stretching, and O=C=O stretching vibrations. The surface roughness of the GQDs-PVA composite thin film was found to be increased after exposure to carbaryl. On the other hand, the optical absorbance of the GQDs-PVA thin film was obtained and further analysis was conducted, revealing a band gap Eg value of 4.090 eV. The sensing potential of the thin film was analyzed using surface plasmon resonance (SPR) spectroscopy. The findings demonstrated that the developed sensor’s lowest detection limit for carbaryl was 0.001 ppb, which was lower than that previously reported, i.e., 0.007 ppb. Moreover, other sensing performance parameters, such as full width at half maximum, detection accuracy, and signal-to-noise ratio, were also investigated to evaluate the sensor’s efficiency. Full article
(This article belongs to the Special Issue Nanostructures and Nanocomposites for Sensing Application: Biological, Food, and Environmental Analysis)
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17 pages, 3723 KiB  
Article
Direct and Sensitive Detection of Dopamine Using Carbon Quantum Dots Based Refractive Index Surface Plasmon Resonance Sensor
by Faten Bashar Kamal Eddin, Yap Wing Fen, Nurul Illya Muhamad Fauzi, Wan Mohd Ebtisyam Mustaqim Mohd Daniyal, Nur Alia Sheh Omar, Muhammad Fahmi Anuar, Hazwani Suhaila Hashim, Amir Reza Sadrolhosseini and Huda Abdullah
Nanomaterials 2022, 12(11), 1799; https://doi.org/10.3390/nano12111799 - 25 May 2022
Cited by 7 | Viewed by 2643
Abstract
Abnormality of dopamine (DA), a vital neurotransmitter in the brain’s neuronal pathways, causes several neurological diseases. Rapid and sensitive sensors for DA detection are required for early diagnosis of such disorders. Herein, a carbon quantum dot (CQD)-based refractive index surface plasmon resonance (SPR) [...] Read more.
Abnormality of dopamine (DA), a vital neurotransmitter in the brain’s neuronal pathways, causes several neurological diseases. Rapid and sensitive sensors for DA detection are required for early diagnosis of such disorders. Herein, a carbon quantum dot (CQD)-based refractive index surface plasmon resonance (SPR) sensor was designed. The sensor performance was evaluated for various concentrations of DA. Increasing DA levels yielded blue-shifted SPR dips. The experimental findings revealed an excellent sensitivity response of 0.138°/pM in a linear range from 0.001 to 100 pM and a high binding affinity of 6.234 TM−1. The effects of varied concentrations of DA on the optical characteristics of CQD thin film were further proved theoretically. Increased DA levels decreased the thickness and real part of the refractive index of CQD film, according to fitting results. Furthermore, the observed reduction in surface roughness using AFM demonstrated that DA was bound to the sensor layer. This, in turn, explained the blue shift in SPR reflectance curves. This optical sensor offers great potential as a trustworthy solution for direct measurement due to its simple construction, high sensitivity, and other sensing features. Full article
(This article belongs to the Special Issue Nanostructures and Nanocomposites for Sensing Application: Biological, Food, and Environmental Analysis)
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