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Nanomaterials
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Luminescence Properties of Nanomaterials and Nanocomposites
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Luminescence Properties of Nanomaterials and Nanocomposites

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

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 8966

Special Issue Editor

Prof. Dr. Marco Cannas

E-Mail Website
Guest Editor
Department of Physics and Chemistry, Palermo University, Palermo, Italy
Interests: structural and optical properties of nano-SiO2; nanoparticles produced by laser ablation in liquid; carbon-based materials (graphene, carbon dots); development of optical fiber based sensors for harsh environments; concentrated photovoltaics

Special Issue Information

Dear colleagues,

One of the most intriguing goals in the field of modern nanotechnologies is the development of materials with physical/chemical properties favorable for highly efficient and color-tunable light emission. In fact, the reduction of material size to the nanometer scale brings out new properties, different from those of the macroscopic component, mainly due to quantum confinement effects and the high specific surface. These unique characteristics introduced by material downsizing open an exceptionally wide range of applications that exploit several luminescence processes: exciton or band-to-band recombination and emission from surface defects. The current research is therefore stimulated towards increasingly ambitious challenges such as the precise control of the optical properties of nanomaterials and nanocomposites by engineering their size; altering their surface by doping and functionalization; and integrating them within specific devices in the fields of optoelectronics, photovoltaics, bioimaging, lasing, and sensing.

The purpose of this Special Issue is to include experimental and/or computational studies of luminescent nanosized materials, ranging from semiconductors to insulators, both pure and alloy. A relevant focus is to highlight the state of knowledge in the manufacturing and characterization of these systems in an effort to understand their remarkable emission properties at a fundamental level and advance their potential for upcoming optical applications.

Prof. Dr. Marco Cannas
Guest Editor

Manuscript Submission Information

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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

  • Semiconductor nanocomposites
  • Insulator nanocomposites
  • Manufacturing
  • Optical properties
  • Microscopy characterization
  • Quantum confinement effects
  • Exciton recombination
  • Surface defects

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Published Papers (3 papers)

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Research

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17 pages, 3106 KiB  
Article
Optoelectronic Properties of Atomically Thin MoxW(1−x)S2 Nanoflakes Probed by Spatially-Resolved Monochromated EELS
by Mario Pelaez-Fernandez, Yung-Chang Lin, Kazu Suenaga and Raul Arenal
Nanomaterials 2021, 11(12), 3218; https://doi.org/10.3390/nano11123218 - 26 Nov 2021
Cited by 9 | Viewed by 2798
Abstract
Band gap engineering of atomically thin two-dimensional (2D) materials has attracted a huge amount of interest as a key aspect to the application of these materials in nanooptoelectronics and nanophotonics. Low-loss electron energy loss spectroscopy has been employed to perform a direct measurement [...] Read more.
Band gap engineering of atomically thin two-dimensional (2D) materials has attracted a huge amount of interest as a key aspect to the application of these materials in nanooptoelectronics and nanophotonics. Low-loss electron energy loss spectroscopy has been employed to perform a direct measurement of the band gap in atomically thin MoxW(1−x)S2 nanoflakes. The results show a bowing effect with the alloying degree, which fits previous studies focused on excitonic transitions. Additional properties regarding the Van Hove singularities in the density of states of these materials, as well as high energy excitonic transition, have been analysed as well. Full article
(This article belongs to the Special Issue Luminescence Properties of Nanomaterials and Nanocomposites)
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14 pages, 1976 KiB  
Article
A Comparative Study of Top-Down and Bottom-Up Carbon Nanodots and Their Interaction with Mercury Ions
by Federico Bruno, Alice Sciortino, Gianpiero Buscarino, Maria Laura Soriano, Ángel Ríos, Marco Cannas, Franco Gelardi, Fabrizio Messina and Simonpietro Agnello
Nanomaterials 2021, 11(5), 1265; https://doi.org/10.3390/nano11051265 - 12 May 2021
Cited by 28 | Viewed by 3101
Abstract
We report a study of carbon dots produced via bottom-up and top-down routes, carried out through a multi-technique approach based on steady-state fluorescence and absorption, time-resolved fluorescence spectroscopy, Raman spectroscopy, infrared spectroscopy, and atomic force microscopy. Our study focuses on a side-to-side comparison [...] Read more.
We report a study of carbon dots produced via bottom-up and top-down routes, carried out through a multi-technique approach based on steady-state fluorescence and absorption, time-resolved fluorescence spectroscopy, Raman spectroscopy, infrared spectroscopy, and atomic force microscopy. Our study focuses on a side-to-side comparison of the fundamental structural and optical properties of the two families of fluorescent nanoparticles, and on their interaction pathways with mercury ions, which we use as a probe of surface emissive chromophores. Comparison between the two families of carbon dots, and between carbon dots subjected to different functionalization procedures, readily identifies a few key structural and optical properties apparently common to all types of carbon dots, but also highlights some critical differences in the optical response and in the microscopic mechanism responsible of the fluorescence. The results also provide suggestions on the most likely interaction sites of mercury ions at the surface of carbon dots and reveal details on mercury-induced fluorescence quenching that can be practically exploited to optimize sensing applications of carbon dots. Full article
(This article belongs to the Special Issue Luminescence Properties of Nanomaterials and Nanocomposites)
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Review

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18 pages, 1998 KiB  
Review
Synthesis and Luminescent Properties of Carbon Nanodots Dispersed in Nanostructured Silicas
by Andrii Vasin, Dmytro Kysil, Andriy Rusavsky, Oksana Isaieva, Alexander Zaderko, Alexei Nazarov and Volodymyr Lysenko
Nanomaterials 2021, 11(12), 3267; https://doi.org/10.3390/nano11123267 - 1 Dec 2021
Cited by 6 | Viewed by 2347
Abstract
Luminescent carbon nanoparticles are a relatively new class of luminescent materials that have attracted the increasing interest of chemists, physicists, biologists and engineers. The present review has a particular focus on the synthesis and luminescent properties of carbon nanoparticles dispersed inside nanostructured silica [...] Read more.
Luminescent carbon nanoparticles are a relatively new class of luminescent materials that have attracted the increasing interest of chemists, physicists, biologists and engineers. The present review has a particular focus on the synthesis and luminescent properties of carbon nanoparticles dispersed inside nanostructured silica of different natures: oxidized porous silicon, amorphous thin films, nanopowders, and nanoporous sol–gel-derived ceramics. The correlations of processing conditions with emission/excitation spectral properties, relaxation kinetics, and photoluminescence photodegradation behaviors are analyzed. Following the evolution of the photoluminescence (PL) through the “from-bottom-to-up” synthesis procedure, the transformation of molecular-like ultraviolet emission of organic precursor into visible emission of carbon nanoparticles is demonstrated. At the end of the review, a novel method for the synthesis of luminescent and transparent composites, in form of nanoporous silica filled with luminescent carbon nanodots, is presented. A prototype of white light emitting devices, constructed on the basis of such luminophores and violet light emitting diodes, is demonstrated. Full article
(This article belongs to the Special Issue Luminescence Properties of Nanomaterials and Nanocomposites)
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