Advances in Properties of Thin Film Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: 30 October 2024 | Viewed by 466

Special Issue Editor


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Guest Editor
Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
Interests: solar spectrum absorption coating; piezoelectric coating; nanocrystalline hard coating; Ion source design

Special Issue Information

Dear Colleagues,

The idea of thin film deposition emerged to solve the problem of cutting the weight and cost of bulk materials. Thin films deposited on solids can improve their surface properties such as optical, mechanical, electrical, and magnetic properties. Thin films are used to form chemical and thermal surface barriers. Depositing the thin film makes it possible to achieve properties that are not easily attainable in bulk solid states. One recent fruitful idea in thin film technology was the concept of a multilayer thin film of different materials. This approach allows us to obtain multiple properties in one thin film simultaneously, for example, in optical and mechanical applications. Another recent advance of thin film and coating technology is the synthesis of high-entropy alloys possessing five or more elements. The main feature of high-entropy alloys is the formation of single-phase thermodynamically stable and high-strength solid solutions. High mixing entropy results in the stability of solid solutions and the prevention of intermetallic phases during the crystallization process. The diversity of high-entropy alloy element composition endows it with many useful properties such as high-temperature strength, wear and corrosion resistance, high hardness, and ductility. These characteristics greatly expand the application range of compound thin film and coatings.

Dr. Vasiliy Pelenovich
Guest Editor

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Keywords

  • thin solid films
  • thin film deposition
  • physical vapor deposition
  • chemical vapor deposition
  • nanocomposites
  • multilayered thin films
  • high-entropy alloys
  • optical filters
  • hard coatings

Published Papers (1 paper)

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Research

13 pages, 2036 KiB  
Article
Influence of DMSO Non-Toxic Solvent on the Mechanical and Chemical Properties of a PVDF Thin Film
by António Diogo André, Ana Margarida Teixeira and Pedro Martins
Appl. Sci. 2024, 14(8), 3356; https://doi.org/10.3390/app14083356 - 16 Apr 2024
Viewed by 296
Abstract
Piezoelectric materials such as PVDF and its copolymers have been widely studied in different areas and with promising applications, such as haptic feedback actuators or deformation sensors for aided-mobility scenarios. To develop PVDF-based solutions, different protocols are reported in the literature; however, a [...] Read more.
Piezoelectric materials such as PVDF and its copolymers have been widely studied in different areas and with promising applications, such as haptic feedback actuators or deformation sensors for aided-mobility scenarios. To develop PVDF-based solutions, different protocols are reported in the literature; however, a toxic and harmful solvent is commonly used (dymethilformamide (DMF)). In the present study, a non-toxic solvent (dymethilsulfoxide (DMSO)) is used to dissolve PVDF powder, while a specific ionic liquid (IL), [PMIM][TFSI], is used to enhance piezoelectric properties. A PVDF/IL thin film is characterized. The physical material characterization is based on optical analysis (to ensure the sample’s homogeneity) and on mechanical linear behaviour (Young’s modulus of 144 MPa and yield stress of 9 MPa). Meanwhile, a chemical analysis focuses on the phase modifications introduced by the addition of IL (β phase increase to 80% and a degree of crystallinity, χ, of 30%). All the results obtained are in good agreement with the literature, which indicates that the proposed experimental protocol is suitable for producing PVDF-based thin films for biomedical applications. Full article
(This article belongs to the Special Issue Advances in Properties of Thin Film Materials)
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