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Physical Synthesis, Properties and Applications of Nanoparticles

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

Deadline for manuscript submissions: 20 October 2024 | Viewed by 2357

Special Issue Editor


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Guest Editor
Dipartimento di Scienze Fisiche, Informatiche e Matematiche and Università di Modena e Reggio Emilia, CNR-NANO, 41125 Modena, Italy
Interests: plasmonic nanoparticles; ultrathin films; synchrotron radiation spectroscopies

Special Issue Information

Dear Colleagues,

This is an invitation to contribute to this Special Issue of Materials focused on nanoparticles (NPs) realized with physical synthesis, in particular, with gas phase synthesis, physical vapor deposition, pulsed laser ablation, supersonic cluster beam methods, mechanical grinding and others. NPs can now be considered an essential aspect of contemporary technology. Their application spans from drug delivery, medical imaging, plasmonics and photocatalysis to the realization of wide-screen TV sets. Most NP production methods are based on chemical synthesis. However, the physical methods can present some important advantages in fundamental studies on the properties of nanosized objects. In particular, the gas phase synthesis of NPs is attracting considerable attention in the scientific community due to its characteristics that make it particularly well suited for these studies [1]. Since its early developments in the 1990s when this bottom-up synthesis method was used to generate beams of clusters in ultra-high vacuum, this technology and its variants have been used for the generation of bigger nanoparticles. The nanoparticle sources, also known as ion cluster sources or gas aggregation sources (GAS), are being used by an increasing number of research groups and also in some limited industrial applications. This physical method of generating NPs represents an interesting alternative to the chemical methods where a “fine tuning” of the NPs' properties is required. Physical synthesis can be single-step and ligand-free, which results in a more accurate analysis of the NPs' structure and of their electronic, optical and magnetic behavior. In this Special Issue, contributions regarding the physical synthesis of NPs and their properties are welcome. Theoretical papers on this vast subject will also be taken into consideration.

Dr. Sergio D’Addato
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. 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

  • physical synthesis of nanoparticles
  • plasmonic nanoparticles
  • magnetic nanoparticles
  • structure of nanoparticles
  • oxide nanoparticles
  • core–shell architecture of nanoparticles
  • applications of nanoparticles
  • photocatalysis
  • quantum dots

Published Papers (3 papers)

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Research

12 pages, 5116 KiB  
Article
Vibration Sensors on Flexible Substrates Based on Nanoparticle Films Grown by Physical Vapor Deposition
by Evangelos Aslanidis, Savvas Sarigiannidis, Evangelos Skotadis and Dimitris Tsoukalas
Materials 2024, 17(7), 1522; https://doi.org/10.3390/ma17071522 - 27 Mar 2024
Viewed by 489
Abstract
Flexible electronics have gained a lot of attention in recent years due to their compatibility with soft robotics, artificial arms, and many other applications. Meanwhile, the detection of acoustic frequencies is a very useful tool for applications ranging from voice recognition to machine [...] Read more.
Flexible electronics have gained a lot of attention in recent years due to their compatibility with soft robotics, artificial arms, and many other applications. Meanwhile, the detection of acoustic frequencies is a very useful tool for applications ranging from voice recognition to machine condition monitoring. In this work, the dynamic response of Pt nanoparticles (Pt NPs)-based strain sensors on flexible substrates is investigated. the nanoparticles were grown in a vacuum by magnetron-sputtering inert-gas condensation. Nanoparticle sensors made on cracked alumina deposited by atomic layer deposition on the flexible substrate and reference nanoparticle sensors, without the alumina layer, were first characterized by their response to strain. The sensors were then characterized by their dynamic response to acoustic frequency vibrations between 20 Hz and 6250 Hz. The results show that alumina sensors outperformed the reference sensors in terms of voltage amplitude. Sensors on the alumina layer could accurately detect frequencies up to 6250 Hz, compared with the reference sensors, which were sensitive to frequencies up to 4250 Hz, while they could distinguish between two neighboring frequencies with a difference of no more than 2 Hz. Full article
(This article belongs to the Special Issue Physical Synthesis, Properties and Applications of Nanoparticles)
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12 pages, 8794 KiB  
Article
Fabrication of Ultra-Fine Ag NPs on TiO2 Thin Films by Alcohol-Assisted Photodeposition Process for Photocatalysis-Related Applications
by Salih Veziroglu
Materials 2024, 17(6), 1354; https://doi.org/10.3390/ma17061354 - 15 Mar 2024
Viewed by 424
Abstract
Noble metal/semiconductor nanocomposites have been synthesized using various methods, including precipitation and hydrothermal and electrochemical processes. Among these, the photodeposition method stands out for its simplicity, without the need for high temperatures, redox agents, or complex steps. This method facilitates the control over [...] Read more.
Noble metal/semiconductor nanocomposites have been synthesized using various methods, including precipitation and hydrothermal and electrochemical processes. Among these, the photodeposition method stands out for its simplicity, without the need for high temperatures, redox agents, or complex steps. This method facilitates the control over noble metal nanoparticle size by adjusting parameters such as metal precursor concentration, irradiation time, and power. However, understanding the interaction between solid and liquid interfaces, particularly the role of solution viscosity in the growth process, remains a challenge. This knowledge is crucial for precise control over nanoparticle size and distribution. Our study highlights the influence of viscosity, manipulated through different alcohols, on the formation of Ag nanostructures on TiO2 thin films via photodeposition, offering insights into optimizing nanocomposite synthesis. Full article
(This article belongs to the Special Issue Physical Synthesis, Properties and Applications of Nanoparticles)
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19 pages, 2391 KiB  
Article
Tuning the Refractive Index Sensitivity of LSPR Transducers Based on Nanocomposite Thin Films Composed of Noble Metal Nanoparticles Dispersed in TiO2
by Diogo Costa, Marco S. Rodrigues, Eduardo Alves, Nuno P. Barradas, Joel Borges and Filipe Vaz
Materials 2023, 16(23), 7355; https://doi.org/10.3390/ma16237355 - 26 Nov 2023
Cited by 2 | Viewed by 771
Abstract
This work reports on the development of nanoplasmonic thin films consisting of Au, Ag, or Au-Ag nanoparticles dispersed in a TiO2 matrix and the optimization of the deposition parameters to tune their optical response. The thin films were produced by reactive DC [...] Read more.
This work reports on the development of nanoplasmonic thin films consisting of Au, Ag, or Au-Ag nanoparticles dispersed in a TiO2 matrix and the optimization of the deposition parameters to tune their optical response. The thin films were produced by reactive DC magnetron sputtering of a Ti target with Au and/or Ag pellets placed on the erosion zone. The thicknesses (50 and 100 nm) of the films, the current density (75 and 100 A/m2) applied to the target (titanium), and the number of pellets placed on its surface were the deposition conditions that were used to tailor the optical (LSPR) response. The total noble metal content varied between 13 and 28 at.% for Au/TiO2 films, between 22 and 30 at.% for Ag/TiO2 films, and 8 to 29 at% for the Au-Ag/TiO2 systems with 1:1, 1:1.5, and 1:2 Au:Ag atomic ratios. After thermal annealing at 400 and 600 °C, LSPR bands were found for all films concerning the Au-TiO2 and Au-Ag/TiO2, while for Ag/TiO2, only for thin films with 28 and 30 at.% of Ag concentration. Refractive index sensitivity (RIS) was evaluated for Au and Au-Ag/TiO2 thin films. It was found that for bimetallic nanoparticles, the sensitivity can increase up to five times when compared to a monometallic nanoplasmonic system. Using Au-Ag/TiO2 thin films can decrease the cost of fabrication of LSPR transducers while improving their sensitivity. Full article
(This article belongs to the Special Issue Physical Synthesis, Properties and Applications of Nanoparticles)
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