One-step preparation of graphene oxide–poly(3,4 ethylenedioxythiophene) composite films for nonvolatile rewritable memory devices

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16340-16347 ◽  
Author(s):  
Yongming Li ◽  
Xiuyuan Ni
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Composite Films ◽  
Memory Devices ◽  
One Step

A nonvolatile rewritable memory composite film consisting of PEDOT and GO has been prepared by using GO-initiated photopolymerization.

Achieving ultrahigh volumetric performance of graphene composite films by an outer–inner dual space utilizing strategy

2020 ◽  
Vol 8 (19) ◽  
pp. 9661-9669 ◽  
Author(s):  
Cong Huang ◽  
Qunli Tang ◽  
Qiushui Feng ◽  
Yanhua Li ◽  
Yali Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Dual Space ◽  
Composite Films ◽  
Oxide Composite ◽  
Graphene Composite ◽  
Reduced Graphene

An outer–inner dual space utilizing strategy is reported for the fabrication of an ultrahigh volumetric performance polydopamine-coated dopamine/reduced graphene oxide composite film.

scholarly journals Theanine-Modified Graphene Oxide Composite Films for Neural Stem Cells Proliferation and Differentiation

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Zhiping Qi ◽  
Xue Chen ◽  
Wenlai Guo ◽  
Chuan Fu ◽  
Su Pan
Keyword(s):  
Graphene Oxide ◽  
Composite Materials ◽  
Composite Film ◽  
Composite Films ◽  
Clinical Problem ◽  
Nerve Tissue ◽  
Cns Injury ◽  
Modified Graphene Oxide ◽  
Proliferation And Differentiation ◽  
Modified Graphene

The central nervous system (CNS) injury has been a worldwide clinical problem for regenerative medicine. Nerve tissue engineering is a new strategy for CNS injury. Among kinds of biomaterials, graphene oxide (GO)-based degradable composite materials are considered to be promising in the field of neurogenesis. In this study, GO and L-theanine (TH) were combined by chemical grafting to prepare a new PLGA/GO-TH composite material. X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier-transform infrared spectra (FTIR), contact angle testers, and mechanical testers were performed to obtain characterization of composite materials. The protein adsorption efficiency of the PLGA/GO-TH films was then evaluated. Next, the effect of the composite films on neural stem cell (NSC) survival, proliferation, and differentiation was investigated. Our results indicated that L-theanine was successfully grafted onto GO. PLGA/GO-TH composite film can significantly improve NSC survival, proliferation, and neuronal differentiation. Our results demonstrated that the neurogenesis function of a novel PLGA/GO-TH composite film and its potential as a carrier for the further application in the CNS injury.

scholarly journals Impact of the Incorporation of Nano-Sized Cellulose Formate on the End Quality of Polylactic Acid Composite Film

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Yidong Zhang ◽  
Chao Liu ◽  
Meiyan Wu ◽  
Zhenqiu Li ◽  
Bin Li
Keyword(s):  
Composite Film ◽  
Polylactic Acid ◽  
Composite Films ◽  
Crystallinity Index ◽  
Regenerated Cellulose ◽  
Fundamental Study ◽  
One Step ◽  
Hydrolysis Of ◽  
Better Than

Polylactic acid (PLA) films with good sustainable and biodegradable properties have been increasingly explored recently, while the poor mechanical property of PLA limits its further application. Herein, three kinds of nano-sized cellulose formate (NCF: cellulose nanofibril (CNF), cellulose nanocrystal (CNC), and regenerated cellulose formate (CF)) with different properties were fabricated via a one-step formic acid (FA) hydrolysis of tobacco stalk, and the influence of the properties of NCF with different morphologies, crystallinity index (CrI), and degree of substitution (DS) on the end quality of PLA composite film was systematically compared. Results showed that the PLA/CNC film showed the highest increase (106%) of tensile strength compared to the CNF- and CF-based films, which was induced by the rod-like CNC with higher CrI. PLA/CF film showed the largest increase (50%) of elongation at the break and more even surface, which was due to the stronger interfacial interaction between PLA and the CF with higher DS. Moreover, the degradation property of PLA/CNF film was better than that of other composite films. This fundamental study was very beneficial for the development of high-quality, sustainable packaging as an alternative to petroleum-based products.

Flexible electrothermal polymer film based on reduced graphene oxide–water polyurethane

2020 ◽  
Vol 34 (25) ◽  
pp. 2050265 ◽  
Author(s):  
Ke Wang ◽  
Zhimin Zhou ◽  
Yuehui Wang
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Rapid Heating ◽  
Tape Casting ◽  
Composite Films ◽  
Low Input ◽  
Reduced Graphene

In this paper, waterborne polyurethane (WPU) conductive films incorporated with reduced graphene oxide (RGO) as conductive fillers were prepared by solution blending and tape casting method. The electrical conductivity, thermal conductivity and microstructures of the composite films were systematically investigated. The experimental results demonstrate that the electrical conductivity and thermal conductivity of the RGO–WPU composite films first increased then decreased with the increase of the RGO content. The resistivity of composite film with 7% RGO reaches to the smallest that is about [Formula: see text], and the thermal conductivity of the composite film with 7% graphene was about 0.29 W.m.K[Formula: see text], which an increase of 70% compared with pure WPU. The electrical conductivity of the composite film decreased with the increase of the original concentration of WPU solution and thickness of the composite film. As film heater, the composite film displayed effective and rapid heating at low input voltages owing to the good conductivity. With an input voltage was in the range of 10–24 V, the film took less than 30s to reach a steady-state temperature, demonstrating the fast response of the composite film heater and suitable for applications in the field of the fast temperature switching with low input voltages as flexible electrothermal heater.

scholarly journals The Fabrication of Cassava Silk Fibroin-Based Composite Film with Graphene Oxide and Chitosan Quaternary Ammonium Salt as a Biodegradable Membrane Material

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Shuqiang Zhao ◽  
Pibo Ma ◽  
Ailan Wan ◽  
Jiwei Huang ◽  
Houyong Yu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Silk Fibroin ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Breaking Strength ◽  
Composite Films ◽  
The Novel ◽  
Membrane Material

AbstractA novel and excellent composite film was fabricated by simply casting cassava silk fibroin (CSF), chitosan quaternary ammonium salt (HACC), and graphene oxide (GO) in an aqueous solution. Scanning electron microscope images showed that when GO was dispersed in the composite films, the surface of CSF-based composite film became rough, and a wrinkled GO structure could be found. When the content of GO was 0.8%, the film displayed a higher change with respect to the breaking strength and elongation, respectively, up to 97.69 ± 3.69 and 79.11 ± 1.48 MPa, keeping good thermal properties because of the incorporation of GO and HACC. Furthermore, the novel CSF/HACC/GO composite film demonstrates a lower degradation rate, implying the improvement of the resistance to the enzyme solution. Especially in the film with 0.8 wt% GO, the residual mass arrived at 64.35 ± 1.1% of the primary mass after 21 days compared with the CSF/HACC film. This would reclaim the application of silk-based composite films in the biomaterial field.

One-Step Electrofabrication of Reduced Graphene Oxide/Poly(N-methylthionine) Composite Film for High Performance Supercapacitors

2020 ◽  
Vol 167 (8) ◽  
pp. 085501 ◽  
Author(s):  
Zhengyang Gan ◽  
Nannan Song ◽  
Hui Zhang ◽  
Zhen Ma ◽  
Yinzhu Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Reduced Graphene ◽  
One Step

scholarly journals Thermally Reduced Graphene Oxide/Carbon Nanotube Composite Films for Thermal Packaging Applications

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 317 ◽  
Author(s):  
Guang-jie Yuan ◽  
Jie-Fei Xie ◽  
Hao-Hao Li ◽  
Bo Shan ◽  
Xiao-Xin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Annealing Temperature ◽  
Composite Films ◽  
Reduced Graphene

Thermally reduced graphene oxide/carbon nanotube (rGO/CNT) composite films were successfully prepared by a high-temperature annealing process. Their microstructure, thermal conductivity and mechanical properties were systematically studied at different annealing temperatures. As the annealing temperature increased, more oxygen-containing functional groups were removed from the composite film, and the percentage of graphene continuously increased. When the annealing temperature increased from 1100 to 1400 °C, the thermal conductivity of the composite film also continuously increased from 673.9 to 1052.1 W m−1 K−1. Additionally, the Young’s modulus was reduced by 63.6%, and the tensile strength was increased by 81.7%. In addition, the introduction of carbon nanotubes provided through-plane thermal conduction pathways for the composite films, which was beneficial for the improvement of their through-plane thermal conductivity. Furthermore, CNTs apparently improved the mechanical properties of rGO/CNT composite films. Compared with the rGO film, 1 wt% CNTs reduced the Young’s modulus by 93.3% and increased the tensile strength of the rGO/CNT composite film by 60.3%, which could greatly improve its flexibility. Therefore, the rGO/CNT composite films show great potential for application as thermal interface materials (TIMs) due to their high in-plane thermal conductivity and good mechanical properties.

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