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Nanomaterials
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Electrochemical Properties and Applications of Nanomaterials
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Electrochemical Properties and Applications of Nanomaterials

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

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 12263

Special Issue Editor

Prof. Dr. Claudia Espro

E-Mail Website
Guest Editor
Department of Engineering, University of Messina, Messina, Italy
Interests: heterogeneous catalysis; catalytic conversion of renewable biomass for the production of bulk chemicals; development of innovative catalytic materials for sensing applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the last decade, the extent of effort dedicated in the field of nanomaterials has grown exponentially. This interest is due to their excellent electrical, optical, thermal, and catalytic properties and strong mechanical strength, ensuring that in recent years various nanomaterials (e.g., carbon nanotubes, gold nanoparticles, silicon nanowires, and quantum dots) have been extensively explored as innovative electrode materials for environmental and electrochemical sensing applications. The use of nanoparticles as transducers, parts of electrochemical sensors for antioxidant detection, adsorbents, analyte carriers, and markers in electrochemical immunosensors continues to arouse considerable interest due to their ability to detect and measure toxic metal ions, toxic gases, pesticides, and hazardous industrial chemicals with high performance in terms of sensitivity, selectivity, and simplicity. At the same time, there has been a growing need for more sensitive, reliable, and affordable sensors and detectors for applications from industrial monitoring to homeland security. This Special Issue on “Electrochemical Properties and Applications of Nanomaterials” will attempt to cover the most recent advances in nanostructures, concerning not only their synthesis and characterization, but especially their functional and smart properties to be applied in advanced sensing and detecting applications. The articles presented in this Special Issue will cover various topics, ranging from different techniques for their synthesis and morphological modification to the preparation of electrochemical sensors and their use in several areas of interest, such as environmental, industrial, and health-medical monitoring and sensing applications. Therefore, this Special Issue welcomes contributions from all researchers working on nanomaterials and their application in electrochemical sensing.

The Special Issue will cover, but will not be limited to, the following topics:

  • Nanomaterial-enabled sensors;
  • Multifunctional materials;
  • Enzymatic biosensors;
  • Metallic nanoparticles as sensors;
  • Electrochemical and optical properties of nanomaterials;
  • Sensors for environmental monitoring.

It is our pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are welcome.

Accepted papers are published in the joint Special Issue in Nanomaterials or Nanomanufacturing (https://0-www-mdpi-com.brum.beds.ac.uk/journal/nanomanufacturing/special_issues/electro_nano).

Prof. Dr. Claudia Espro
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 (QDs)
  • metal nanoparticles
  • carbonaceous nanomaterials
  • nanostructured metal oxides for sensing
  • nanomaterials for biosensing
  • healthcare applications
  • environmental monitoring
  • new fields of application

Published Papers (4 papers)

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Research

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13 pages, 4527 KiB  
Article
Highly Sensitive and Stable Humidity Sensor Based on the Bi-Layered PVA/Graphene Flower Composite Film
by Sheik Abdur Rahman, Shenawar Ali Khan, Muhammad Muqeet Rehman and Woo-Young Kim
Nanomaterials 2022, 12(6), 1026; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12061026 - 21 Mar 2022
Cited by 24 | Viewed by 3109
Abstract
Two-dimensional (2D) materials and their composites have gained significant importance as the functional layer of various environmental sensors and nanoelectronics owing to their unique properties. This work reports for the first time a highly sensitive, fast, and stable humidity sensor based on the [...] Read more.
Two-dimensional (2D) materials and their composites have gained significant importance as the functional layer of various environmental sensors and nanoelectronics owing to their unique properties. This work reports for the first time a highly sensitive, fast, and stable humidity sensor based on the bi-layered active sensing area composed of graphene flower (GF) and poly (vinyl alcohol) PVA thin films for multifunctional applications. The GF/PVA humidity sensor exhibited stable impedance response over 15 days, for a relative humidity (RH) range of (40–90% RH) under ambient operating conditions. The proposed bi-layered humidity sensor also exhibited an ultra-high capacitive sensitivity response of the 29 nF/%RH at 10 kHz and fast transient response of 2 s and 3.5 s, respectively. Furthermore, the reported sensor also showed a good response towards multi-functional applications such as non-contact skin humidity and mouth breathing detection. Full article
(This article belongs to the Special Issue Electrochemical Properties and Applications of Nanomaterials)
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13 pages, 3231 KiB  
Article
Electrochemical and Fluorescent Properties of Crown Ether Functionalized Graphene Quantum Dots for Potassium and Sodium Ions Detection
by Daniela Iannazzo, Claudia Espro, Angelo Ferlazzo, Consuelo Celesti, Caterina Branca and Giovanni Neri
Nanomaterials 2021, 11(11), 2897; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11112897 - 29 Oct 2021
Cited by 25 | Viewed by 2559
Abstract
The concentration of sodium and potassium ions in biological fluids, such as blood, urine and sweat, is indicative of several basic body function conditions. Therefore, the development of simple methods able to detect these alkaline ions is of outmost importance. In this study, [...] Read more.
The concentration of sodium and potassium ions in biological fluids, such as blood, urine and sweat, is indicative of several basic body function conditions. Therefore, the development of simple methods able to detect these alkaline ions is of outmost importance. In this study, we explored the electrochemical and optical properties of graphene quantum dots (GQDs) combined with the selective chelating ability of the crown ethers 15-crown-5 and 18-crown-6, with the final aim to propose novel composites for the effective detection of these ions. The results obtained comparing the performances of the single GQDs and crown ethers with those of the GQDs-15-crown-5 and GQDs-18-crown-6 composites, have demonstrated the superior properties of these latter. Electrochemical investigation showed that the GQDs based composites can be exploited for the potentiometric detection of Na+ and K+ ions, but selectivity still remains a concern. The nanocomposites showed the characteristic fluorescence emissions of GQDs and crown ethers. The GQDs-18-crown-6 composite exhibited ratiometric fluorescence emission behavior with the variation of K+ concentration, demonstrating its promising properties for the development of a selective fluorescent method for potassium determination. Full article
(This article belongs to the Special Issue Electrochemical Properties and Applications of Nanomaterials)
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15 pages, 3321 KiB  
Article
Self Standing Mats of Blended Polyaniline Produced by Electrospinning
by Antonio Fotia, Angela Malara, Emilia Paone, Lucio Bonaccorsi, Patrizia Frontera, Giulia Serrano and Andrea Caneschi
Nanomaterials 2021, 11(5), 1269; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11051269 - 12 May 2021
Cited by 13 | Viewed by 2374
Abstract
Conducting nanofibers of polyaniline (PANI) doped with camphor-10-sulfonic acid (HCSA) and blended with different polymers, such as polymethyl methacrylate (PMMA) and polyvinyl acetate (PVAc), have been fabricated using the electrospinning technique. Scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA) were utilized to [...] Read more.
Conducting nanofibers of polyaniline (PANI) doped with camphor-10-sulfonic acid (HCSA) and blended with different polymers, such as polymethyl methacrylate (PMMA) and polyvinyl acetate (PVAc), have been fabricated using the electrospinning technique. Scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA) were utilized to characterize the morphology and the thermal stability of PANI-blended fibers. An extensive study was performed to understand the copolymer influence on both the structural and surface properties of the realized conductive thin films. Samples main electrical characteristics, as conductivity, specific capacitance and electrochemical performances were tested. The better mats were obtained with the use of PVAc copolymer, which showed a conductivity value two orders of magnitude higher than the PMMA system. Aiming at further improving the electrochemical features of these blended mats, hybrid fibers based on PANI/PVAc/graphene oxide and PANI/PVAc/iron oxide were also produced and characterized. The obtained mats were potentially addressed to numerous practical fields, including sensors, health applications, smart devices and multifunctional textile materials. Full article
(This article belongs to the Special Issue Electrochemical Properties and Applications of Nanomaterials)
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Review

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27 pages, 3318 KiB  
Review
Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives
by Viviana Bressi, Angelo Ferlazzo, Daniela Iannazzo and Claudia Espro
Nanomaterials 2021, 11(5), 1120; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11051120 - 26 Apr 2021
Cited by 61 | Viewed by 6429
Abstract
The continuous decrease in the availability of fossil resources, along with an evident energy crisis, and the growing environmental impact due to their use, has pushed scientific research towards the development of innovative strategies and green routes for the use of renewable resources, [...] Read more.
The continuous decrease in the availability of fossil resources, along with an evident energy crisis, and the growing environmental impact due to their use, has pushed scientific research towards the development of innovative strategies and green routes for the use of renewable resources, not only in the field of energy production but also for the production of novel advanced materials and platform molecules for the modern chemical industry. A new class of promising carbon nanomaterials, especially graphene quantum dots (GQDs), due to their exceptional chemical-physical features, have been studied in many applications, such as biosensors, solar cells, electrochemical devices, optical sensors, and rechargeable batteries. Therefore, this review focuses on recent results in GQDs synthesis by green, easy, and low-cost synthetic processes from eco-friendly raw materials and biomass-waste. Significant advances in recent years on promising recent applications in the field of electrochemical sensors, have also been discussed. Finally, challenges and future perspectives with possible research directions in the topic are briefly summarized. Full article
(This article belongs to the Special Issue Electrochemical Properties and Applications of Nanomaterials)
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