Special Issue "Functional Nanomaterials for Optoelectronics and Photocatalysis"

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

Deadline for manuscript submissions: 31 May 2022 | Viewed by 4859

Special Issue Editors

Prof. Dr. Protima Rauwel
E-Mail Website
Guest Editor
Institute of technology, Estonian University of Life Sciences, Kreutzwaldi 56/1, 51014 Tartu, Estonia
Interests: nanoparticles; thin films; carbon-based hybrid materials; photovoltaics; LED; photocatalysis; electron microscopy; water purification
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Erwan Rauwel
E-Mail Website
Guest Editor
Estonian University of Life Science, Institute of Technology, Kreutzwaldi 56/1, 51014 Tartu, Estonia
Interests: metal oxide thin film deposition; atomic layer deposition; nanomaterial synthesis; metal nanoparticles; metal oxide nanoparticles; water purification; nanomedicine; photovoltaics; hybrid nanocomposites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Energy efficient devices are the need of the hour. In this regard, functional and energy efficient nanomaterials with high-end applications such as optoelectronic devices, which encompass diode lasers, light emitting diode (LED) and photovoltaics (PV), have gained much attention. In addition, semiconducting nanomaterials also find applications in photocatalysis. In such nanomaterials, surface states as well as quantum effects influence their optoelectronic as well as photocatalytic activities. Metal nanoparticles exhibiting surface plasmon resonance (SPR) such as Ag, Cu and Au, further enhance their properties. Nanomaterial-based devices present several advantages such as ease of fabrications and low cost. Moreover, conformal coating of nanomaterials on flexible substrates produce more versatile and lightweight devices.

This Special Issue invites all researchers in the field to submit relevant publications in optoelectronics and photocatalysis. These include organic, inorganic, and hybrid (organic-inorganic) nanomaterials. Additionally, publications that report on device fabrication using these nanomaterials are also actively sought.

Prof. Dr. Protima Rauwel
Prof. Dr. Erwan Rauwel
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. 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 2400 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

  • thin films
  • nanoparticles
  • polymers
  • hybrid nanomaterials
  • carbon based nanomaterials
  • quantum effect
  • surface plasmon resonance
  • photovoltaics
  • laser diodes
  • light emitting diodes
  • photocatalysis and device fabrication

Published Papers (5 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Article
Construction of Chemically Bonded Interface of Organic/Inorganic g-C3N4/LDH Heterojunction for Z-Schematic Photocatalytic H2 Generation
Nanomaterials 2021, 11(10), 2762; https://doi.org/10.3390/nano11102762 - 18 Oct 2021
Cited by 2 | Viewed by 817
Abstract
The design and synthesis of a Z-schematic photocatalytic heterostructure with an intimate interface is of great significance for the migration and separation of photogenerated charge carriers, but still remains a challenge. Here, we developed an efficient Z-scheme organic/inorganic g-C3N4/LDH [...] Read more.
The design and synthesis of a Z-schematic photocatalytic heterostructure with an intimate interface is of great significance for the migration and separation of photogenerated charge carriers, but still remains a challenge. Here, we developed an efficient Z-scheme organic/inorganic g-C3N4/LDH heterojunction by in situ growing of inorganic CoAl-LDH firmly on organic g-C3N4 nanosheet (NS). Benefiting from the two-dimensional (2D) morphology and the surface exposed pyridine-like nitrogen atoms, the g-C3N4 NS offers efficient trap sits to capture transition metal ions. As such, CoAl-LDH NS can be tightly attached onto the g-C3N4 NS, forming a strong interaction between CoAl-LDH and g-C3N4 via nitrogen–metal bonds. Moreover, the 2D/2D interface provides a high-speed channel for the interfacial charge transfer. As a result, the prepared heterojunction composite exhibits a greatly improved photocatalytic H2 evolution activity, as well as considerable stability. Under visible light irradiation of 4 h, the optimal H2 evolution rate reaches 1952.9 μmol g−1, which is 8.4 times of the bare g-C3N4 NS. The in situ construction of organic/inorganic heterojunction with a chemical-bonded interface may provide guidance for the designing of high-performance heterostructure photocatalysts. Full article
(This article belongs to the Special Issue Functional Nanomaterials for Optoelectronics and Photocatalysis)
Show Figures

Figure 1

Article
Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties
Nanomaterials 2021, 11(10), 2611; https://doi.org/10.3390/nano11102611 - 04 Oct 2021
Viewed by 579
Abstract
This research work describes the synthesis of ZnO nanostructures doped with Ho3+ ions using a conventional sol–gel synthesis method. The nanostructured produced exhibited a wurtzite hexagonal structure in both ZnO and ZnO:Ho3+ (0.25, 0.5, 0.75 mol%) samples. The change in morphology [...] Read more.
This research work describes the synthesis of ZnO nanostructures doped with Ho3+ ions using a conventional sol–gel synthesis method. The nanostructured produced exhibited a wurtzite hexagonal structure in both ZnO and ZnO:Ho3+ (0.25, 0.5, 0.75 mol%) samples. The change in morphology with addition of Ho3+ dopants was observed, which was assigned to Ostwald ripening effect occurring during the nanoparticles’ growth. The photoluminescence emission properties of the doped samples revealed that Ho3+ was emitting through its electronic transitions. Moreover, reduced surface defects were observed in the Holmium doped samples whose analysis was undertaken using an X-ray Photoelectron Spectroscopy (XPS) technique. Finally, enhanced room temperature ferromagnetism (RT-FM) for Ho3+-doped ZnO (0.5 mol%) samples with a peak-to-peak line width of 452 G was detected and found to be highly correlated to the UV–VIS transmittance results. Full article
(This article belongs to the Special Issue Functional Nanomaterials for Optoelectronics and Photocatalysis)
Show Figures

Figure 1

Communication
Synthesis of Group II-VI Semiconductor Nanocrystals via Phosphine Free Method and Their Application in Solution Processed Photovoltaic Devices
Nanomaterials 2021, 11(8), 2071; https://doi.org/10.3390/nano11082071 - 15 Aug 2021
Cited by 3 | Viewed by 811
Abstract
Solution-processed CdTe semiconductor nanocrystals (NCs) have exhibited astonishing potential in fabricating low-cost, low materials consumption and highly efficient photovoltaic devices. However, most of the conventional CdTe NCs reported are synthesized through high temperature microemulsion method with high toxic trioctylphosphine tellurite (TOP-Te) or tributylphosphine [...] Read more.
Solution-processed CdTe semiconductor nanocrystals (NCs) have exhibited astonishing potential in fabricating low-cost, low materials consumption and highly efficient photovoltaic devices. However, most of the conventional CdTe NCs reported are synthesized through high temperature microemulsion method with high toxic trioctylphosphine tellurite (TOP-Te) or tributylphosphine tellurite (TBP-Te) as tellurium precursor. These hazardous substances used in the fabrication process of CdTe NCs are drawing them back from further application. Herein, we report a phosphine-free method for synthesizing group II-VI semiconductor NCs with alkyl amine and alkyl acid as ligands. Based on various characterizations like UV-vis absorption (UV), transmission electron microscope (TEM), and X-ray diffraction (XRD), among others, the properties of the as-synthesized CdS, CdSe, and CdTe NCs are determined. High-quality semiconductor NCs with easily controlled size and morphology could be fabricated through this phosphine-free method. To further investigate its potential to industrial application, NCs solar cells with device configuration of ITO/ZnO/CdSe/CdTe/Au and ITO/ZnO/CdS/CdTe/Au are fabricated based on NCs synthesized by this method. By optimizing the device fabrication conditions, the champion device exhibited power conversion efficiency (PCE) of 2.28%. This research paves the way for industrial production of low-cost and environmentally friendly NCs photovoltaic devices. Full article
(This article belongs to the Special Issue Functional Nanomaterials for Optoelectronics and Photocatalysis)
Show Figures

Figure 1

Article
Optimizing the PMMA Electron-Blocking Layer of Quantum Dot Light-Emitting Diodes
Nanomaterials 2021, 11(8), 2014; https://doi.org/10.3390/nano11082014 - 06 Aug 2021
Cited by 1 | Viewed by 880
Abstract
Quantum dots (QDs) are promising candidates for producing bright, color-pure, cost-efficient, and long-lasting QD-based light-emitting diodes (QDLEDs). However, one of the significant problems in achieving high efficiency of QDLEDs is the imbalance between the rates of charge-carrier injection into the emissive QD layer [...] Read more.
Quantum dots (QDs) are promising candidates for producing bright, color-pure, cost-efficient, and long-lasting QD-based light-emitting diodes (QDLEDs). However, one of the significant problems in achieving high efficiency of QDLEDs is the imbalance between the rates of charge-carrier injection into the emissive QD layer and their transport through the device components. Here we investigated the effect of the parameters of the deposition of a poly (methyl methacrylate) (PMMA) electron-blocking layer (EBL), such as PMMA solution concentration, on the characteristics of EBL-enhanced QDLEDs. A series of devices was fabricated with the PMMA layer formed from acetone solutions with concentrations ranging from 0.05 to 1.2 mg/mL. The addition of the PMMA layer allowed for an increase of the maximum luminance of QDLED by a factor of four compared to the control device without EBL, that is, to 18,671 cd/m2, with the current efficiency increased by an order of magnitude and the turn-on voltage decreased by ~1 V. At the same time, we have demonstrated that each particular QDLED characteristic has a maximum at a specific PMMA layer thickness; therefore, variation of the EBL deposition conditions could serve as an additional parameter space when other QDLED optimization approaches are being developed or implied in future solid-state lighting and display devices. Full article
(This article belongs to the Special Issue Functional Nanomaterials for Optoelectronics and Photocatalysis)
Show Figures

Figure 1

Article
Enhancing the UV Emission in ZnO–CNT Hybrid Nanostructures via the Surface Plasmon Resonance of Ag Nanoparticles
Nanomaterials 2021, 11(2), 452; https://doi.org/10.3390/nano11020452 - 10 Feb 2021
Cited by 1 | Viewed by 1035
Abstract
The crystal quality and surface states are two major factors that determine optical properties of ZnO nanoparticles (NPs) synthesized through nonaqueous sol–gel routes, and both are strongly dependent on the growth conditions. In this work, we investigate the influence of the different growth [...] Read more.
The crystal quality and surface states are two major factors that determine optical properties of ZnO nanoparticles (NPs) synthesized through nonaqueous sol–gel routes, and both are strongly dependent on the growth conditions. In this work, we investigate the influence of the different growth temperatures (240 and 300 °C) on the morphology, structural and crystal properties of ZnO NP. The effects of conjoining ZnO NP with carbon nanotubes (CNT) and the role of surface states in such a hybrid nanostructure are studied by optical emission and absorption spectroscopy. We demonstrate that depending on the synthesis conditions, activation or passivation of certain surface states may occur. Next, silver nanoparticles are incorporated into ZnO–CNT nanostructures to explore the plasmon–exciton coupling effect. The observed enhanced excitonic and suppressed defect-related emissions along with blue-shifted optical band gap suggest an intricate interaction of Burstein–Moss, surface plasmon resonance and surface band-bending effects behind the optical phenomena in hybrid ZnO–CNT–Ag nanocomposites. Full article
(This article belongs to the Special Issue Functional Nanomaterials for Optoelectronics and Photocatalysis)
Show Figures

Graphical abstract

Back to TopTop