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Nanomaterials
Special Issues
New Growth of Nanostructures for Electrochemical Application and Electrocatalysts
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New Growth of Nanostructures for Electrochemical Application and Electrocatalysts

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (27 September 2023) | Viewed by 6077

Special Issue Editors

Prof. Dr. Md. Akhtaruzzaman Akhtar

E-Mail Website
Guest Editor
Solar Energy Research Institute, National University of Malaysia, Bangi 43600, Malaysia
Interests: rational design of organic/inorganic semiconductors; nano-materials for various applications, including dye-sensitized solar cells (DSSCs); perovskite thin film solar cell; light-emitting organic field-effect transistors (LE-OFETs); organic thin film transistors (OTFTs); chemical and biological sensors; nano-electronics and electroluminescence devices
Prof. Dr. Kamaruzzaman Sopian

E-Mail Website
Guest Editor
Solar Energy Research Institute (SERI), The National University of Malaysia, Bangi 43600, Selangor, Malaysia
Interests: solar energy technology
Dr. Vidhya Selvanthan

E-Mail Website
Guest Editor Assistant
Solar Energy Research Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
Interests: rational design of organic/inorganic semiconductors, nano-materials for various applications, including dye-sensitized solar cells (DSSCs); perovskite thin film solar cell; light-emitting organic field-effect transistors (LE-OFETs); organic thin film transistors (OTFTs); chemical and biological sensors; nano-electronics and electroluminescence devices

Special Issue Information

Dear Colleagues,

Nanostructures growth engineering is a highly prospective strategy adopted in the development of materials dedicated to various electrochemical applications including supercapacitors, electrocatalysts, lithium-ion batteries, photo-electrochemical cells, electrochemical sensors and photovoltaics. Fabrication of unique nanostructures with improved conductivity is a salient factor in facilitating charge transfer kinetics within an electrochemical reaction. By far, various experimental approaches such as solution processing, green chemistry techniques, thin-film processes and electrodeposition have been adopted to grow nanostructures of varied morphology, topology and orientation. Despite the competence of these nanostructures in elevating the overall electrochemical performances, maintaining the reproducibility, scalability, chemical and thermal stability of the nanostructure framework remains a challenge to date. In extension, for most of the applications, homogeneous growth of the nanostructures on the substrate surface is a prerequisite to achieve functional fabrication of electrochemical devices. In such cases, in-depth analysis of surface defects, nucleation mechanism and structure/substrate adhesion, is essential to achieve the desired assembly of nanostructures on the substrate.

The present Special Issue of Nanomaterials is dedicated to highlighting the contemporary strategies proposed by researchers for the growth of multi-dimensional nanostructured material aimed at electrochemical applications. The Special Issue intends to cover a broader spectrum of nanomaterials in terms of composition with emphasis on metals, metal oxides, semiconductors and composite materials. Elucidating the impact of morphological characteristics of these nanostructured materials on their physical, optical, electrical and ultimately the electrochemical properties can contribute to the collective knowledge of improving the efficiency of each electrochemical device

Prof. Dr. Md. Akhtaruzzaman Akhtar
Prof. Dr. Kamaruzzaman Sopian
Guest Editors

Dr. Vidhya Selvanthan
Guest Editor Assistant

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

  • nanostructures
  • nanoparticles
  • electrochemical devices
  • morphology engineering
  • nanostructured supercapacitors
  • nanostructured electrocatalysts
  • nanostructured electrochemical sensors
  • solar photovoltaics

Published Papers (4 papers)

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Research

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10 pages, 2840 KiB  
Article
Detach GaN-Based Film to Realize a Monolithic Bifunctional Device for Both Lighting and Detection
by Pan Dai, Ziwei Xu, Min Zhou, Min Jiang, Yukun Zhao, Wenxian Yang and Shulong Lu
Nanomaterials 2023, 13(2), 359; https://doi.org/10.3390/nano13020359 - 16 Jan 2023
Cited by 2 | Viewed by 1335
Abstract
Due to the emerging requirements of miniaturization and multifunctionality, monolithic devices with both functions of lighting and detection are essential for next-generation optoelectronic devices. In this work, based on freestanding (In,Ga)N films, we demonstrate a monolithic device with two functions of lighting and [...] Read more.
Due to the emerging requirements of miniaturization and multifunctionality, monolithic devices with both functions of lighting and detection are essential for next-generation optoelectronic devices. In this work, based on freestanding (In,Ga)N films, we demonstrate a monolithic device with two functions of lighting and self-powered detection successfully. The freestanding (In,Ga)N film is detached from the epitaxial silicon (Si) substrate by a cost-effective and fast method of electrochemical etching. Due to the stress release and the lightening of the quantum-confined Stark effect (QCSE), the wavelength blueshift of electroluminescent (EL) peak is very small (<1 nm) when increasing the injection current, leading to quite stable EL spectra. On the other hand, the proposed monolithic bifunctional device can have a high ultraviolet/visible reject ratio (Q = 821) for self-powered detection, leading to the excellent detection selectivity. The main reason can be attributed to the removal of Si by the lift-off process, which can limit the response to visible light. This work paves an effective way to develop new monolithic multifunctional devices for both detection and display. Full article
(This article belongs to the Special Issue New Growth of Nanostructures for Electrochemical Application and Electrocatalysts)
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19 pages, 6190 KiB  
Article
Effect of Calcination Temperature on Structural, Morphological and Optical Properties of Copper Oxide Nanostructures Derived from Garcinia mangostana L. Leaf Extract
by Yu Bin Chan, Vidhya Selvanathan, Lai-Hock Tey, Md. Akhtaruzzaman, Farah Hannan Anur, Sinouvassane Djearamane, Akira Watanabe and Mohammod Aminuzzaman
Nanomaterials 2022, 12(20), 3589; https://doi.org/10.3390/nano12203589 - 13 Oct 2022
Cited by 17 | Viewed by 1846
Abstract
Synthesis of copper oxide (CuO) nanostructures via biological approach has gained attention to reduce the harmful effects of chemical synthesis. The CuO nanostructures were synthesized through a green approach using the Garcinia mangostana L. leaf extract and copper (II) nitrate trihydrate as a [...] Read more.
Synthesis of copper oxide (CuO) nanostructures via biological approach has gained attention to reduce the harmful effects of chemical synthesis. The CuO nanostructures were synthesized through a green approach using the Garcinia mangostana L. leaf extract and copper (II) nitrate trihydrate as a precursor at varying calcination temperatures (200–600 °C). The effect of calcination temperatures on the structural, morphological and optical properties of CuO nanostructures was studied. The red shifting of the green-synthesized CuO nanoparticles’ absorption peak was observed in UV-visible spectrum, and the optical energy bandgap was found to decrease from 3.41 eV to 3.19 eV as the calcination temperatures increased. The PL analysis shown that synthesized CuO NPs calcinated at 500 °C has the maximum charge carriers separation. A peak located at 504–536 cm−1 was shown in FTIR spectrum that indicated the presence of a copper-oxygen vibration band and become sharper and more intense when increasing the calcination temperature. The XRD studies revealed that the CuO nanoparticles’ crystalline size was found to increase from 12.78 nm to 28.17 nm, and dislocation density decreased from 61.26 × 1014 cm−1 to 12.60 × 1014 cm−1, while micro strain decreased from 3.40 × 10−4 to 1.26 × 10–4. From the XPS measurement, only CuO single phase without impurities was detected for the green-mediated NPs calcinated at 500 °C. The morphologies of CuO nanostructures were examined using FESEM and became more spherical in shape at elevated calcination temperature. More or less spherical nanostructure of green-mediated CuO calcinated at 500 °C were also observed using TEM. The purity of the green-synthesized CuO nanoparticles was evaluated by EDX analysis, and results showed that increasing calcination temperature increases the purity of CuO nanoparticles. Full article
(This article belongs to the Special Issue New Growth of Nanostructures for Electrochemical Application and Electrocatalysts)
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17 pages, 3852 KiB  
Article
Investigation of Morphological, Optical, and Dielectric Properties of RF Sputtered WOx Thin Films for Optoelectronic Applications
by Samiya Mahjabin, Md. Mahfuzul Haque, K. Sobayel, Vidhya Selvanathan, M. S. Jamal, M. S. Bashar, Munira Sultana, Mohammad Ismail Hossain, Md. Shahiduzzaman, Merfat Algethami, Sami S. Alharthi, Nowshad Amin, Kamaruzzaman Sopian and Md. Akhtaruzzaman
Nanomaterials 2022, 12(19), 3467; https://doi.org/10.3390/nano12193467 - 04 Oct 2022
Cited by 11 | Viewed by 1630
Abstract
Tungsten oxide (WOx) thin films were synthesized through the RF magnetron sputtering method by varying the sputtering power from 30 W to 80 W. Different investigations have been conducted to evaluate the variation in different morphological, optical, and dielectric properties with [...] Read more.
Tungsten oxide (WOx) thin films were synthesized through the RF magnetron sputtering method by varying the sputtering power from 30 W to 80 W. Different investigations have been conducted to evaluate the variation in different morphological, optical, and dielectric properties with the sputtering power and prove the possibility of using WOx in optoelectronic applications. An Energy Dispersive X-ray (EDX), stylus profilometer, and atomic force microscope (AFM) have been used to investigate the dependency of morphological properties on sputtering power. Transmittance, absorbance, and reflectance of the films, investigated by Ultraviolet-Visible (UV-Vis) spectroscopy, have allowed for further determination of some necessary parameters, such as absorption coefficient, penetration depth, optical band energy gap, refractive index, extinction coefficient, dielectric parameters, a few types of loss parameters, etc. Variations in these parameters with the incident light spectrum have been closely analyzed. Some important parameters such as transmittance (above 80%), optical band energy gap (~3.7 eV), and refractive index (~2) ensure that as-grown WOx films can be used in some optoelectronic applications, mainly in photovoltaic research. Furthermore, strong dependencies of all evaluated parameters on the sputtering power were found, which are to be of great use for developing the films with the required properties. Full article
(This article belongs to the Special Issue New Growth of Nanostructures for Electrochemical Application and Electrocatalysts)
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Review

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29 pages, 11041 KiB  
Review
Combustion Synthesis of Materials for Application in Supercapacitors: A Review
by Narek Sisakyan, Gayane Chilingaryan, Aram Manukyan and Alexander S. Mukasyan
Nanomaterials 2023, 13(23), 3030; https://doi.org/10.3390/nano13233030 - 27 Nov 2023
Cited by 2 | Viewed by 938
Abstract
A supercapacitor is an energy storage device that has the advantage of rapidly storing and releasing energy compared to traditional batteries. One powerful method for creating a wide range of materials is combustion synthesis, which relies on self-sustained chemical reactions. Specifically, solution combustion [...] Read more.
A supercapacitor is an energy storage device that has the advantage of rapidly storing and releasing energy compared to traditional batteries. One powerful method for creating a wide range of materials is combustion synthesis, which relies on self-sustained chemical reactions. Specifically, solution combustion synthesis involves mixing reagents at the molecular level in an aqueous solution. This method allows for the fabrication of various nanostructured materials, such as binary and complex oxides, sulfides, and carbon-based nanocomposites, which are commonly used for creating electrodes in supercapacitors. The solution combustion synthesis offers flexibility in tuning the properties of the materials by adjusting the composition of the reactive solution, the type of fuel, and the combustion conditions. The process takes advantage of high temperatures, short processing times, and significant gas release to produce well crystalline nanostructured materials with a large specific surface area. This specific surface area is essential for enhancing the performance of electrodes in supercapacitors. Our review focuses on recent publications in this field, specifically examining the relationship between the microstructure of materials and their electrochemical properties. We discuss the findings and suggest potential improvements in the properties and stability of the fabricated composites based on the results. Full article
(This article belongs to the Special Issue New Growth of Nanostructures for Electrochemical Application and Electrocatalysts)
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