Special Issue "Graphene and 2D Materials for Flexible Electronics"

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

Deadline for manuscript submissions: 31 August 2020.

Special Issue Editor

Prof. Dr. Irina V. Antonova
Website
Guest Editor
Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian
Interests: graphene; fluorinated graphene; printed and flexible devices

Special Issue Information

Dear Colleagues,

The rapid growth of the popularity of the Internet of Things and flexible, wearable, and stretchable electronics in the past decade has resulted in strong progress in flexible electronics. It is expected that flexible electronics in the near future will take a significant place in our daily life, in the fileds of health care, computation and memory, gadgets, touch screens and displays, energy storage and generation, electronic textile, human activities, and more. Two-dimensional layered crystals are believed to be the most promising candidates for flexible electronics applications, owing to their well-known features including the ultimate thickness scalability down to atomic thin, high flexibility and intrinsic strain limit. But the investigation of mechanical properties of 2D materials, its derivatives and composites remain incomplete or for some materials they are simply unknown. Another important item is the design of structures or devices (the combination of the layers, their configuration, and so on) focused on the wide spectrum of applications. In the present Issue, we hope to discuss the new results of the mechanical properties of 2D materials. The planned Issue welcomes the studies of new 2D materials, structures, and devices.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Irina V. Antonova
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 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 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 2000 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

  • graphene
  • 2D materials
  • mechanical properties
  • wearable and stretchable materials
  • new trends
  • structures and devices

Published Papers (2 papers)

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Research

Open AccessArticle
Flexibility of Fluorinated Graphene-Based Materials
Materials 2020, 13(5), 1032; https://doi.org/10.3390/ma13051032 - 25 Feb 2020
Abstract
The resistivity of different films and structures containing fluorinated graphene (FG) flakes and chemical vapor deposition (CVD)-grown graphene of various fluorination degrees under tensile and compressive strains due to bending deformations was studied. Graphene and multilayer graphene films grown by means of the [...] Read more.
The resistivity of different films and structures containing fluorinated graphene (FG) flakes and chemical vapor deposition (CVD)-grown graphene of various fluorination degrees under tensile and compressive strains due to bending deformations was studied. Graphene and multilayer graphene films grown by means of the chemical vapor deposition (CVD) method were transferred onto the flexible substrate by laminating and were subjected to fluorination. They demonstrated a weak fluorination degree (F/C lower 20%). Compressive strains led to a strong (one-two orders of magnitude) decrease in the resistivity in both cases, which was most likely connected with the formation of additional conductive paths through fluorinated graphene. Tensile strain up to 3% caused by the bending of both types of CVD-grown FG led to a constant value of the resistivity or to an irreversible increase in the resistivity under repeated strain cycles. FG films created from the suspension of the fluorinated graphene with a fluorination degree of 20–25%, after the exclusion of design details of the used structures, demonstrated a stable resistivity at least up to 2–3% of tensile and compressive strain. The scale of resistance changes ΔR/R0 was found to be in the range of 14–28% with a different sign at the 10% tensile strain (bending radius 1 mm). In the case of the structures with the FG thin film printed on polyvinyl alcohol, a stable bipolar resistive switching was observed up to 6.5% of the tensile strain (bending radius was 2 mm). A further increase in strain (6.5–8%) leads to a decrease in ON/OFF current ratio from 5 down to 2 orders of magnitude. The current ratio decrease is connected with an increase under the tensile strain in distances between conductive agents (graphene islands and traps at the interface with polyvinyl alcohol) and thickness of fluorinated barriers within the active layer. The excellent performance of the crossbar memristor structures under tensile strain shows that the FG films and structures created from suspension are especially promising for flexible electronics. Full article
(This article belongs to the Special Issue Graphene and 2D Materials for Flexible Electronics)
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Open AccessArticle
Graphene-PEDOT: PSS Humidity Sensors for High Sensitive, Low-Cost, Highly-Reliable, Flexible, and Printed Electronics
Materials 2019, 12(21), 3477; https://doi.org/10.3390/ma12213477 - 24 Oct 2019
Cited by 1
Abstract
A comparison of the structure and sensitivity of humidity sensors prepared from graphene (G)-PEDOT: PSS (poly (3,4-ethylenedioxythiophene)) composite material on flexible and solid substrates is performed. Upon an increase in humidity, the G: PEDOT: PSS composite films ensure a response (a linear increase [...] Read more.
A comparison of the structure and sensitivity of humidity sensors prepared from graphene (G)-PEDOT: PSS (poly (3,4-ethylenedioxythiophene)) composite material on flexible and solid substrates is performed. Upon an increase in humidity, the G: PEDOT: PSS composite films ensure a response (a linear increase in resistance versus humidity) up to 220% without restrictions typical of sensors fabricated from PEDOT: PSS. It was found that the response of the examined sensors depends not only on the composition of the layer and on its thickness but, also, on the substrate used. The capability of flexible substrates to absorb the liquid component of the ink used to print the sensors markedly alters the structure of the film, making it more porous; as a result, the response to moisture increases. However, in the case of using paper, a hysteresis of resistance occurs during an increase or decrease of humidity; that hysteresis is associated with the capability of such substrates to absorb moisture and transfer it to the sensing layer of the sensor. A study of the properties of G: PEDOT: PSS films and test device structures under deformation showed that when the G: PEDOT: PSS films or structures are bent to a bending radius of 3 mm (1.5% strain), the properties of those films and structures remain unchanged. This result makes the composite humidity sensors based on G: PEDOT: PSS films promising devices for use in flexible and printed electronics. Full article
(This article belongs to the Special Issue Graphene and 2D Materials for Flexible Electronics)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Graphene–PEDOT: PSS humidity sensors for high sensitive, low-cost, highly-reliable flexible and printed electronics

Vasiliy I. Popov, Igor A. Kotin , Nadezhda A. Nebogatikova , Svetlana A. Smagulova, Irina V. Antonova

A comparison of the structure and sensitivity of humidity sensors prepared from 16 graphene (G) - PEDOT:PSS composite material on flexible and solid substrates is 17 performed. Upon an increase of humidity, the G:PEDOT:PSS composite films ensure a 18 response (a linear increase in resistance versus humidity) up to 220% without restrictions 19 typical of sensors fabricated from PEDOT:PSS. It was found that the response of the 20 examined sensors depends not only on the composition of the composite layer and on its 21 thickness but, also, on the substrate used. The capability of flexible substrates to absorb the 22 liquid component of the ink used to print the sensors markedly alters the structure of the 23 film, making it more porous; as a result, the response to moisture increases. However, in 24 the case of using paper, a hysteresis of resistance occurs during an increase or decrease of 25 humidity; that hysteresis is associated with the capability of such substrates to absorb 26 moisture and transfer it to the sensing layer of the sensor. A study of the properties of 27 G:PEDOT:PSS films and test device structures under deformation showed that, when the 28 G:PEDOT:PSS films or structures are bent to a bending radius of 3 mm (1.5% strain), the 29 properties of those films and structures remain unchanged. This result makes the 30 composite humidity sensors based on G:PEDOT:PSS films promising devices for use in 31 flexible and printed electronics.

 

2.Flexibility of the fluorinated graphene based materials and composites

A.I. Ivanov, I.I. Kurkina, N.A. Nebogatikova, I.A. Kotin, I.V. Antonova

Abstract:

 

3. Chemresistive properties of imprinted fluorinated graphene films

Vitalii I. Sysoev, Mikhail O. Bulavskii, Kirill V. Gurin, Lyubov G.Bulusheva, Alexander V. Okotrub

We demonstrated a flexible gas sensor based on fluorinated graphene film reduced using low-temperature annealing. Fluorinated graphites with different composition were uniformly suspended in toluene and filtered through nitrocellulose membrane. Depending on the functional composition, powders have different dispersion ability, which affects the average size and thickness of the flakes. The obtained fluorinated graphene films were transferred to different substrates including SiO2/Si, glass and using simple imprinting method. The FG films were partially reduced via low-temperature annealing in vacuum. The obtained conductive films were tested towards a low concentration of nitrogen dioxide at room temperature. The difference in the sensor response of films was found to be related with the flake size, which is defined by the chosen fraction and functional composition of initial fluorinated graphites.

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