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Crystals
Special Issues
Advances in Hybrid and Composite Materials Based on Micro/Nanofibers
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Advances in Hybrid and Composite Materials Based on Micro/Nanofibers

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 2875

Special Issue Editors

Dr. Mihaela Beregoi

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Guest Editor
National Institute of Materials Physics, Multifunctional Materials and Structures Laboratory, 077125 Bucarest-Magurele, Romania
Interests: functional materials; electrospun fibers; nanotechnology; electrospinning; conducting polymers; biomimetic materials; actuators; emerging materials; nanocomposites; thin film technology; metal oxides; PVD depostions
Dr. Raluca-Florentina Negrea

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Guest Editor
National Institute of Materials Physics, Atomic Structures and Defects in Advanced Materials Laboratory, 077125 Bucharest-Magurele, Romania
Interests: transmission electron microscopy; atomic resolution; annular bright field; electron diffraction; EELS; thin film; structural characterization; extended defects
Dr. Corina Ciobotaru

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Guest Editor
National Institute of Materials Physics, Atomic Structures and Defects in Advanced Materials Laboratory, 077125 Bucharest-Magurele, Romania
Interests: organometallic; current-voltage; OLED; photoluminescence; organic electronics

Special Issue Information

Dear Colleagues,

Over the years, designing and developing hybrid materials and composites based on micro/nanofibers has progressively increased. These are a special class of materials widely used in various applications (e.g. sensors, actuators, tissue substituents, supercapacitors, water purification or photocatalytic systems and so on). This because of their versatile properties, especially for great active surface translated into high functionality. A wide range of precursors were used for obtaining polymer micro/nanofibers (classic or conducting polymers), organic-inorganic hybrids (e.g. polymers-metal oxides) or inorganic composites (e.g. metal oxides). A lot of preparation methods have been promoted in order to remove the shortcomings of using micro/nanofibers based materials (e.g. mechanical stability or reproducibility) such as electrospinning, chemical and electrochemical synthesis or combined routes. However, there is still a lot of work to be done for obtaining materials with ideal characteristics.

The aim of this Special Issue is to bring together the recent studies on preparation, characterization and integration of micro/nanofibers based materials in devices with improved features. Regarding the preparation, all king of methods and precursors are accepted. An important step in developing functional hybrid and composite materials is their rigorous characterization utilizing advanced and complementary techniques. A device characterization or a potential application should be targeted. Therefore, we invite researchers to submit their work to this multidisciplinary topic, contributing to the technological progress of these unique materials.

Dr. Mihaela Beregoi
Dr. Raluca-Florentina Negrea
Dr. Corina Ciobotaru
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. Crystals 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 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

  • composites based micro/nanofibers
  • organic-inorganic hybrids
  • micro/nanofibers based materials
  • crystalline micro/nanofibers
  • decorated micro/nanofibers
  • metal oxides, conducting polymers, etc.
  • micro/nanofibers growth
  • electrospinning
  • structure-properties relationships

Published Papers (1 paper)

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Research

19 pages, 4732 KiB  
Article
Surface Enhanced Infrared Absorption Studies of SiO2–TiO2–Ag Nanofibers: Effect of Silver Electrodeposition Time on the Amplification of Signals
by Blanca Selenis Cabello-Ribota, Rurik Farías and Simón Yobanny Reyes-López
Crystals 2021, 11(5), 563; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11050563 - 19 May 2021
Cited by 9 | Viewed by 2046
Abstract
Surface Enhanced on Infrared Absorption (SEIRAS) and Raman Spectroscopy (SERS) are nondestructive analytic techniques used to detect low concentrations and recognize the fingerprints of molecules. The recognition of the absorption from samples by conventional infrared spectroscopy (IR) via Attenuated Total Reflection (ATR) is [...] Read more.
Surface Enhanced on Infrared Absorption (SEIRAS) and Raman Spectroscopy (SERS) are nondestructive analytic techniques used to detect low concentrations and recognize the fingerprints of molecules. The recognition of the absorption from samples by conventional infrared spectroscopy (IR) via Attenuated Total Reflection (ATR) is difficult for molecules with a low signal strength. However, developed structures with SERS and SEIRAS effect present problems such as high cost, low stability, and low compatibility. Research into new media to obtain greater amplification is largely based on the creation of nanoscale structures with symmetrical arrangements and reproducible distances, resulting in aggregates of nanoparticles that help generate hot spots which are active for amplification. The sol-gel and electrospinning method for the obtention of ceramics provides an alternative means by which to produce said substrates. Fibers of nanometric scale provide an increase of surface area which allows more contact to occur with analytes. Consequently, in this study, a silica-titania-silver nanostructured support that amplifies signal intensity for Raman and infrared spectroscopy was developed. The silica-titania support was developed by sol-gel and electrospinning techniques, and the as spun fibers were treated at 800 °C. Then, the ceramic fibrous membrane was placed on conductive indium tin oxide plastic to be doped with silver using an electroplating technique, varying the silver nitrate concentration (5, 10 and 20 mM), as well as electrodeposition times (1, 2, 5 and 10 min), with a constant voltage (1 V). Twelve different supports were obtained that showed amplification. The enhancement of infrared signals from pyridine and crystal violet molecules adsorbed on silica-titania-silver (SiO2–TiO2–Ag) nanofibers was studied in situ by Attenuated Total Reflection-Fourier Transformed Infrared Spectroscopy (ATR-FTIR). The highest amplification was obtained by the support doped at 10 min in a 10 mM concentration, with an amplification factor of 2.74 in the band localized at 3301 cm−1. In Raman spectroscopy, the highest amplification factor was 27.03, on the support doped for 5 min at a concentration of 5 mM. Full article
(This article belongs to the Special Issue Advances in Hybrid and Composite Materials Based on Micro/Nanofibers)
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