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Nanomaterials and Quantum Dots: Advancements in Photocatalysis and Optoelectronics
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Nanomaterials and Quantum Dots: Advancements in Photocatalysis and Optoelectronics

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (20 March 2024) | Viewed by 2827

Special Issue Editors

Dr. Kasimayan Uma

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Guest Editor
Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Interests: nanomaterial; photocatalyst
Prof. Dr. Ramalinga Viswanathan Mangalaraja

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Guest Editor
Faculty of Engineering and Sciences, Universidad Adolfo Ibáñez (UAI), Santiago, Chile
Interests: materials science; two-dimensional (2D) materials; solar cells; supercapacitors; electrocatalysts; hydrogen energy; fuel cells; environmental sustainability
Special Issues, Collections and Topics in MDPI journals
Dr. Arunachalam Arulraj

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Guest Editor
Department of Electrical, Faculty of Engineering, Universidad Tecnológica Metropolitana (UTEM), Santiago, Chile
Interests: renewable energy; two-dimensional (2D) materials; electrocatalysts; electrochemical energy storage; hydrogen energy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recent attention has been increasingly drawn to nanomaterials or quantum dots owing to their exceptional physical and chemical activity. Consequently, these materials have found extensive applications in various fields, including solar cells, batteries, sensors, and optoelectronic devices. Quantum dots or nanoparticles are gaining significant attention as exceptional materials for the optoelectronic field, attributed to their outstanding characteristics, including a prolonged carrier lifetime, high charge carrier mobility, and a remarkable photoluminescence quantum yield. Their quantum confinement effect, resulting from the quantum size effect, confines excitons to a small region, leading to enhanced charge dissociation in photovoltaics and enabling the precise control of optical absorption across the various wavelength regions, thus optimizing solar energy harvesting. Nanomaterials, especially metal oxides and core–shell nanocomposites, play an indispensable role in enabling crucial processes, including CO2 reduction, gas sensing, and supercapacitors. Remarkably, nanoparticles facilitate the enhancement of electron generation, consequently resulting in the creation of additional OH radicals that substantially elevate the efficiency of the photocatalytic process.

This Special Issue aims to highlight the cutting-edge advancements in the synthesis of nanomaterials and quantum dots for application in light-emitting diodes (LEDs), photocatalysis, and biological systems. Additionally, the Issue aims to advance our understanding of systematically derived nanomaterials and quantum dots, elucidating their excitonic properties, growth morphologies, and exceptional performance in the field of energy, the environment and biological applications.

Dr. Kasimayan Uma
Prof. Dr. Ramalinga Viswanathan Mangalaraja
Dr. Arunachalam Arulraj
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 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. Materials 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 2600 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

  • nanomaterials
  • quantum dots
  • light-emitting diode
  • photocatalyst
  • 2D materials
  • porous structures
  • photocatalytic activity
  • solar cells
  • sensors
  • biological activity

Published Papers (3 papers)

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Research

12 pages, 3605 KiB  
Article
Hot-Injection Synthesis of Cesium Lead Halide Perovskite Nanowires with Tunable Optical Properties
by Jiazhen He, Hang Li, Chengqi Liu, Xiaoqian Wang, Qi Zhang, Jinfeng Liu, Mingwei Wang and Yong Liu
Materials 2024, 17(10), 2173; https://doi.org/10.3390/ma17102173 - 7 May 2024
Viewed by 419
Abstract
Metal halide perovskite semiconductors have emerged as promising materials for various optoelectronic applications due to their unique crystal structure and outstanding properties. Among different forms, perovskite nanowires (NWs) offer distinct advantages, including a high aspect ratio, superior crystallinity, excellent light absorption, and carrier [...] Read more.
Metal halide perovskite semiconductors have emerged as promising materials for various optoelectronic applications due to their unique crystal structure and outstanding properties. Among different forms, perovskite nanowires (NWs) offer distinct advantages, including a high aspect ratio, superior crystallinity, excellent light absorption, and carrier transport properties, as well as unique anisotropic luminescence properties. Understanding the formation mechanism and structure–property relationship of perovskite NWs is crucial for exploring their potential in optoelectronic devices. In this study, we successfully synthesized all-inorganic halide perovskite NWs with high aspect ratios and an orthorhombic crystal phase using the hot-injection method with controlled reaction conditions and surface ligands. These NWs exhibit excellent optical and electrical properties. Moreover, precise control over the halogen composition through a simple anion exchange process enables the tuning of the bandgap, leading to fluorescence emission, covering a wide range of colors across the visible spectrum. Consequently, these perovskite NWs hold great potential for efficient energy conversion and catalytic applications in photoelectrocatalysis. Full article
(This article belongs to the Special Issue Nanomaterials and Quantum Dots: Advancements in Photocatalysis and Optoelectronics)
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12 pages, 6101 KiB  
Article
Microwave-Assisted Synthesis of Flower-like MnMoO4 Nanostructures and Their Photocatalytic Performance
by Muthamizh Selvamani, Arulvarman Kesavan, Arunachalam Arulraj, Praveen C. Ramamurthy, Mostafizur Rahaman, Saravanan Pandiaraj, Muthu Thiruvengadam, Elisban Juani Sacari Sacari, Elmer Marcial Limache Sandoval and Mangalaraja Ramalinga Viswanathan
Materials 2024, 17(7), 1451; https://doi.org/10.3390/ma17071451 - 22 Mar 2024
Viewed by 1070
Abstract
This article describes an affordable method for the synthesis of MnMoO4 nanoflowers through the microwave synthesis approach. By manipulating the reaction parameters like solvent, pH, microwave power, and irradiation duration along this pathway, various nanostructures can be acquired. The synthesized nanoflowers were [...] Read more.
This article describes an affordable method for the synthesis of MnMoO4 nanoflowers through the microwave synthesis approach. By manipulating the reaction parameters like solvent, pH, microwave power, and irradiation duration along this pathway, various nanostructures can be acquired. The synthesized nanoflowers were analyzed by using a powder X-ray diffractometer (XRD), field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), and UV–vis diffuse reflectance spectroscopy (UV–DRS) to determine their crystalline nature, morphological and functional group, and optical properties, respectively. X-ray photoelectron spectroscopy (XPS) was performed for the examination of elemental composition and chemical states by qualitative and quantitative analysis. The results of the investigations demonstrated that the MnMoO4 nanostructures with good crystallinity and distinct shape were formed successfully. The synthesized MnMoO4 nanoflowers were tested for their efficiency as a photocatalyst in the degradation studies of methylene blue (MB) as model organic contaminants in an aqueous medium under visible light, which showed their photocatalytic activity with a degradation of 85%. Through the band position calculations using the electronegative value of MnMoO4, the photocatalytic mechanism of the nanostructures was proposed. The results indicated that the effective charge separation, and transfer mechanisms, in addition to the flower-like shape, were responsible for the photocatalytic performance. The stability of the recovered photocatalyst was examined through its recyclability in the degradation of MB. Leveraging MnMoO4’s photocatalytic properties, future studies may focus on scaling up these processes for practical and large-scale environmental remediation. Full article
(This article belongs to the Special Issue Nanomaterials and Quantum Dots: Advancements in Photocatalysis and Optoelectronics)
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8 pages, 3167 KiB  
Communication
Efficient CsPbBr3 Quantum-Dot Light-Emitting Diodes Using Sputtered NiO Films as Hole Injection Layers
by Pao-Hsun Huang, Sih-An Chen, Li-Wei Chao, Jia-Xun Xie, Ching-Yu Liao, Zong-Liang Tseng and Sheng-Hui Chen
Materials 2023, 16(17), 6060; https://doi.org/10.3390/ma16176060 - 4 Sep 2023
Cited by 2 | Viewed by 902
Abstract
Perovskite quantum dots (QDs) have showed excellent optoelectronic properties to extend the application range of novel solid-state lighting, such as perovskite QD based LEDs (QD-LEDs). However, the traditional device structure of perovskite QD-LEDs employed PEDOT:PSS as a hole inject layer (HIL), which impairs [...] Read more.
Perovskite quantum dots (QDs) have showed excellent optoelectronic properties to extend the application range of novel solid-state lighting, such as perovskite QD based LEDs (QD-LEDs). However, the traditional device structure of perovskite QD-LEDs employed PEDOT:PSS as a hole inject layer (HIL), which impairs stability due to acidic surface characteristics. This study proposes the sputtered NiO films as an HIL to replace acidic PEDOT:PSS. The NiO films with significantly different characteristics were prepared by controlling the sputtering parameters to investigate the devices’ performance of NiO-based CsPbBr3 QD-LEDs. The optimized device showed an excellent performance with maxima luminescence of 20,118 cd/m2 and an external quantum efficiency (EQE) up to 3.63%. Full article
(This article belongs to the Special Issue Nanomaterials and Quantum Dots: Advancements in Photocatalysis and Optoelectronics)
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