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Special Issue "Advances in Bendable and Soft Material Film"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Biomaterials".

Deadline for manuscript submissions: closed (31 August 2016)

Special Issue Editors

Guest Editor
Prof. Fu Hsiang Ko

Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
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Interests: soft material; biosensor fabrication; flexible transistor; wound dressing material
Guest Editor
Dr. Jian-Guo Zheng

Irvine Materials Research Institute, University of California, Irvine, CA 92697, USA
Website | E-Mail
Interests: electron probe instrumentation; materials characterization; electron microscopy
Guest Editor
Prof. Dr. Chih-Feng Wang

Department of Materials Science and Engineering, I-Shou University, Kaohsiung, Taiwan 84001, ROC
Website | E-Mail
Interests: surface properties of soft matter; surface anisotropic wettability; oil water separation

Special Issue Information

Dear Colleagues,

The dream of building easy processing, low cost, low temperature manufacturing, low energy consumption, lightweight, fast, conformal and rugged devices, which serve for bendable electronic field or soft wound dressing biomaterial field is becoming more and more feasible with regards to the incredible advances made in drug carrier and flexible transistor in past few years. Advances in bendable and soft material film inspire versatile new fields, such as regenerative medicine, tissue engineering and drug delivery, as well as flexible display, radio frequency identification tag, and organic thin film transistor.

It is my pleasure to invite you to submit original research papers within the scope of this Special Issue. Short communication and state-of-the-art reviews will also be greatly appreciated.

Prof. Dr. Fu-Hsiang Ko
Prof. Dr. Jian-Guo Zheng
Prof. Dr. Chih-Feng Wang
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 papers will be 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 monthly 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 1500 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

  • bendable material
  • soft matter
  • flexible devices and electronics
  • wound dressing material
  • wearable sensor material
  • soft transduction medium or structure
  • sol-gel material
  • soft hydrated and porous materials

Published Papers (5 papers)

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Research

Open AccessArticle Low-Temperature, Solution-Processed, Transparent Zinc Oxide-Based Thin-Film Transistors for Sensing Various Solvents
Materials 2017, 10(3), 234; doi:10.3390/ma10030234
Received: 28 July 2016 / Revised: 28 July 2016 / Accepted: 22 February 2017 / Published: 26 February 2017
PDF Full-text (5354 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A low temperature solution-processed thin-film transistor (TFT) using zinc oxide (ZnO) film as an exposed sensing semiconductor channel was fabricated to detect and identify various solution solvents. The TFT devices would offer applications for low-cost, rapid and highly compatible water-soluble detection and could
[...] Read more.
A low temperature solution-processed thin-film transistor (TFT) using zinc oxide (ZnO) film as an exposed sensing semiconductor channel was fabricated to detect and identify various solution solvents. The TFT devices would offer applications for low-cost, rapid and highly compatible water-soluble detection and could replace conventional silicon field effect transistors (FETs) as bio-sensors. In this work, we demonstrate the utility of the TFT ZnO channel to sense various liquids, such as polar solvents (ethanol), non-polar solvents (toluene) and deionized (DI) water, which were dropped and adsorbed onto the channel. It is discussed how different dielectric constants of polar/non-polar solvents and DI water were associated with various charge transport properties, demonstrating the main detection mechanisms of the thin-film transistor. Full article
(This article belongs to the Special Issue Advances in Bendable and Soft Material Film)
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Open AccessCommunication Mechanical Fatigue Behavior of Flexible Printed Organic Thin-Film Transistors under Applied Strain
Materials 2017, 10(1), 18; doi:10.3390/ma10010018
Received: 12 October 2016 / Revised: 28 November 2016 / Accepted: 16 December 2016 / Published: 28 December 2016
Cited by 1 | PDF Full-text (3303 KB) | HTML Full-text | XML Full-text
Abstract
We report on the mechanical fatigue behavior of printed, organic, thin-film transistors (OTFTs) based on a polymer semiconductor, investigated by repeatedly applying strain to the flexible OTFT devices and assessing their electrical characteristics after 60,000 bending cycles. As part of our investigation, we
[...] Read more.
We report on the mechanical fatigue behavior of printed, organic, thin-film transistors (OTFTs) based on a polymer semiconductor, investigated by repeatedly applying strain to the flexible OTFT devices and assessing their electrical characteristics after 60,000 bending cycles. As part of our investigation, we established that the rates of reduction in source/drain currents in the OTFT device depended on bending directions. Our improved understanding of the mechanical fatigue behavior of the flexible printed OTFT devices provides valuable insights into their employment in practical flexible electronics applications. Full article
(This article belongs to the Special Issue Advances in Bendable and Soft Material Film)
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Open AccessArticle Flexural Capability of Patterned Transparent Conductive Substrate by Performing Electrical Measurements and Stress Simulations
Materials 2016, 9(10), 850; doi:10.3390/ma9100850
Received: 31 August 2016 / Revised: 4 October 2016 / Accepted: 14 October 2016 / Published: 19 October 2016
Cited by 1 | PDF Full-text (3034 KB) | HTML Full-text | XML Full-text
Abstract
The suitability of stacked thin films for next-generation display technology was analyzed based on their properties and geometrical designs to evaluate the mechanical reliability of transparent conducting thin films utilized in flexural displays. In general, the high bending stress induced by various operation
[...] Read more.
The suitability of stacked thin films for next-generation display technology was analyzed based on their properties and geometrical designs to evaluate the mechanical reliability of transparent conducting thin films utilized in flexural displays. In general, the high bending stress induced by various operation conditions is a major concern regarding the mechanical reliability of indium–tin–oxide (ITO) films deposited on polyethylene terephthalate (PET) substrates; mechanical reliability is commonly used to estimate the flexibility of displays. However, the pattern effect is rarely investigated to estimate the mechanical reliability of ITO/PET films. Thus, this study examined the flexible content of patterned ITO/PET films with two different line widths by conducting bending tests and sheet resistance measurements. Moreover, a stress–strain simulation enabled by finite element analysis was performed on the patterned ITO/PET to explore the stress impact of stacked film structures under various levels of flexural load. Results show that the design of the ITO/PET film can be applied in developing mechanically reliable flexible electronics. Full article
(This article belongs to the Special Issue Advances in Bendable and Soft Material Film)
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Open AccessArticle Study of Different Sol-Gel Coatings to Enhance the Lifetime of PDMS Devices: Evaluation of Their Biocompatibility
Materials 2016, 9(9), 728; doi:10.3390/ma9090728
Received: 20 July 2016 / Revised: 12 August 2016 / Accepted: 23 August 2016 / Published: 25 August 2016
PDF Full-text (6871 KB) | HTML Full-text | XML Full-text
Abstract
A study of PDMS (polydimethylsiloxane) sol-gel–coated channels fabricated using soft lithography and a laser direct writing technique is presented. PDMS is a biocompatible material that presents a high versatility to reproduce several structures. It is widely employed in the fabrication of preclinical devices
[...] Read more.
A study of PDMS (polydimethylsiloxane) sol-gel–coated channels fabricated using soft lithography and a laser direct writing technique is presented. PDMS is a biocompatible material that presents a high versatility to reproduce several structures. It is widely employed in the fabrication of preclinical devices due to its advantages but it presents a rapid chemical deterioration to organic solvents. The use of sol-gel layers to cover the PDMS overcomes this problem since it provides the robustness of glass for the structures made with PDMS, decreasing its deterioration and changing the biocompatibility of the surface. In this work, PDMS channels are coated with three different kinds of sol-gel compositions (60MTES/40TEOS, 70MTES/30TISP and 80MTES/20TISP). The endothelial cell adhesion to the different coated devices is evaluated in order to determine the most suitable sol-gel preparation conditions to enhance cellular adhesion. Full article
(This article belongs to the Special Issue Advances in Bendable and Soft Material Film)
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Open AccessArticle Bio-Inspired Supramolecular Chemistry Provides Highly Concentrated Dispersions of Carbon Nanotubes in Polythiophene
Materials 2016, 9(6), 438; doi:10.3390/ma9060438
Received: 7 April 2016 / Revised: 17 May 2016 / Accepted: 27 May 2016 / Published: 2 June 2016
PDF Full-text (4826 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In this paper we report the first observation, through X-ray diffraction, of noncovalent uracil–uracil (U–U) dimeric π-stacking interactions in carbon nanotube (CNT)–based supramolecular assemblies. The directionally oriented morphology determined using atomic force microscopy revealed highly organized behavior through π-stacking
[...] Read more.
In this paper we report the first observation, through X-ray diffraction, of noncovalent uracil–uracil (U–U) dimeric π-stacking interactions in carbon nanotube (CNT)–based supramolecular assemblies. The directionally oriented morphology determined using atomic force microscopy revealed highly organized behavior through π-stacking of U moieties in a U-functionalized CNT derivative (CNT–U). We developed a dispersion system to investigate the bio-inspired interactions between an adenine (A)-terminated poly(3-adeninehexyl thiophene) (PAT) and CNT–U. These hybrid CNT–U/PAT materials interacted through π-stacking and multiple hydrogen bonding between the U moieties of CNT–U and the A moieties of PAT. Most importantly, the U···A multiple hydrogen bonding interactions between CNT–U and PAT enhanced the dispersion of CNT–U in a high-polarity solvent (DMSO). The morphology of these hybrids, determined using transmission electron microscopy, featured grape-like PAT bundles wrapped around the CNT–U surface; this tight connection was responsible for the enhanced dispersion of CNT–U in DMSO. Full article
(This article belongs to the Special Issue Advances in Bendable and Soft Material Film)
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