scholarly journals Reversible Nonlinear I-V Behavior of ZnO-Decorated Graphene Nanoplatelets/Epoxy Resin Composites

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 951 ◽  
Author(s):  
Yang Yuan ◽  
Zhaoming Qu ◽  
Qingguo Wang ◽  
Xiaoning Sun ◽  
Erwei Cheng
Keyword(s):  
Epoxy Resin ◽  
Threshold Voltage ◽  
Weight Ratio ◽  
Graphene Nanoplatelets ◽  
Switching Threshold ◽  
Solution Blending ◽  
Measurement Results ◽  
Conducting Mechanism ◽  
Significant Attention ◽  
Switching Threshold Voltage

With the more serious threats from complex electromagnetic environments, composites composed of conductive or semiconductive fillers and polymeric matrices could exhibit excellent nonlinear I-V characteristics, and have drawn significant attention in the field of overvoltage protection. In this research, graphene nanoplatelets (GNPs) are decorated by ZnO and mixed into an epoxy resin (ER) matrix via solution blending to prepare composites. A characterization analysis and the I-V measurement results of the GNPs/ER composites indicate that ZnO nanoparticles are well bonded with GNPs and exhibit obvious nonlinear I-V behavior under proper applied voltage with high nonlinear coefficients. The switching threshold voltage and nonlinear coefficients could be controlled by adjusting the weight ratio of GNPs and ZnO of the filler. Moreover, compared with the poor recoverability of pure GNP-filled ER in previous research, the GNP-ZnO/ER composites exhibited excellent reversibility of nonlinear I-V behavior under multiple repetitive I-V measurements. And compared with different composites, the sample with a 1:8 weight ratio of GO to Zn(Ac)2 presents the smallest variation of switching threshold voltage at 158 V, with a standard deviation of 1.27% from among 20 measurements, which indicates the best reversibility. Finally, the conducting mechanism of the reversible nonlinear I-V characteristic is investigated and analyzed.

scholarly journals Nonlinear Conductive Characteristics of ZnO-Coated Graphene Nanoplatelets-Carbon Nanotubes/Epoxy Resin Composites

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1634
Author(s):  
Yang Yuan ◽  
Zhaoming Qu ◽  
Qingguo Wang ◽  
Xiaoning Sun
Keyword(s):  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Zno Nanoparticles ◽  
Filler Content ◽  
Electronic Devices ◽  
Weight Ratio ◽  
Graphene Nanoplatelets ◽  
Electromagnetic Environment ◽  
Solution Blending ◽  
Switching Threshold Voltage

With the increasing threats arising from the electromagnetic environment, polymeric composites which could exhibit nonlinear conductive characteristics are highly required in the protection of electronic devices against overvoltage. In this research, ZnO nanoparticles are coated onto graphene nanoplatelets (GNPs)-carbon nanotubes (CNTs) hybrid, and then it is embedded in epoxy resin (ER) matrix via solution blending. Based on the characterization results, CNTs are well dispersed across the GNPs which prevent the restacking of GNPs and CNTs. At the same time, ZnO nanoparticles are well-bonded to the surfaces of GNPs-CNTs hybrid. During repeated conductive characteristic measurements, GNPs-CNTs-ZnO/ER composite is able to demonstrate distinctly reversible nonlinear conductive behavior, with high nonlinear coefficients. Especially, the filler content in GNPs-CNTs-ZnO/ER composite is only 12.5% of that in GNPs-ZnO/ER composite reported in our previous work. Moreover, it is shown that the nonlinear coefficients and switching threshold voltage can be modified by controlling the weight ratios of GNPs, CNTs, and ZnO. Finally, the samples with 1:1 weight ratio of GO to MWCNTs (A-6.67 and A-10) exhibit the best reversible nonlinear conductive behavior.

Low switching-threshold-voltage zinc oxide nanowire array resistive random access memory

2016 ◽  
Vol 618 ◽  
pp. 90-94 ◽  
Author(s):  
Guan-Hung Shen ◽  
Andrew Ronaldi Tandio ◽  
Mei-Yu Lin ◽  
Gao-Feng Lin ◽  
Kai-Huang Chen ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Threshold Voltage ◽  
Nanowire Array ◽  
Random Access ◽  
Random Access Memory ◽  
Resistive Random Access Memory ◽  
Access Memory ◽  
Switching Threshold ◽  
Zinc Oxide Nanowire ◽  
Switching Threshold Voltage

Conductive switching behavior of epoxy resin/micron-aluminum particles composites

e-Polymers ◽  
2018 ◽  
Vol 18 (1) ◽  
pp. 85-89 ◽  
Author(s):  
Pin Lu ◽  
Zhaoming Qu ◽  
Qingguo Wang ◽  
Yan Wang ◽  
Wei Cheng
Keyword(s):  
Epoxy Resin ◽  
Threshold Voltage ◽  
Applied Voltage ◽  
Volume Fraction ◽  
Switching Behavior ◽  
Spherical Particles ◽  
Constant Voltage ◽  
Aluminum Particles ◽  
Great Potential Application ◽  
Switching Threshold Voltage

AbstractEpoxy resin (ER)/micron-aluminum particles (MP) composites with different filling concentration of spherical particles were fabricated. The nonlinear conductive behavior of ER/MP composites under increasing applied voltage using the improved V-I method was investigated. Under sufficient high intensity applied constant voltage, the obvious conductive switching behavior of samples with volume fraction 12.7%, 16.9% and 18.9% was found. The conductivity of ER/MP composites increase up to 3–4 orders of magnitude when the conductor-insulator transition occurs. The switching threshold voltage decreases with the increase of volume fraction of MP in the composites. The results show that the ER/MP composites with conductive switching properties are of great potential application in electromagnetic protection of electron devices and systems.

Synthesis of tetranitro-oxacalix[4]arene with oligoheteroacene groups and its nonvolatile ternary memory performance

2014 ◽  
Vol 1 (4) ◽  
pp. 446-451 ◽  
Author(s):  
Pei-Yang Gu ◽  
Junkuo Gao ◽  
Cai-Jian Lu ◽  
Wangqiao Chen ◽  
Chengyuan Wang ◽  
...  
Keyword(s):  
Threshold Voltage ◽  
Memory Performance ◽  
Memory Devices ◽  
Switching Threshold ◽  
Switching Threshold Voltage

Memory devices based on 4N4OPz exhibit excellent ternary memory behavior with high ON2/ON1/OFF current ratios and low switching threshold voltage.

scholarly journals A novel h-BN–RGO hybrids for epoxy resin composites achieving enhanced high thermal conductivity and energy density

RSC Advances ◽  
2017 ◽  
Vol 7 (38) ◽  
pp. 23355-23362 ◽  
Author(s):  
Tao Huang ◽  
Xiaoliang Zeng ◽  
Yimin Yao ◽  
Rong Sun ◽  
Fanling Meng ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Composite Materials ◽  
Energy Density ◽  
Epoxy Resin ◽  
High Thermal Conductivity ◽  
Resin Composites ◽  
Epoxy Resin Composites ◽  
Significant Attention

In recent decades, significant attention has been focused on developing composite materials with high thermal conductivity utilizing h-BN, which has outstanding thermal conductivity.

scholarly journals Preparation of high antistatic HDPE/polyaniline encapsulated graphene nanoplatelet composites by solution blending

RSC Advances ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 2796-2803 ◽  
Author(s):  
Quan Wang ◽  
Yuming Wang ◽  
Qingguo Meng ◽  
Tinglan Wang ◽  
Weihong Guo ◽  
...  
Keyword(s):  
Graphene Nanoplatelets ◽  
Graphene Nanoplatelet ◽  
Solution Blending

High antistatic HDPE composites were firstly prepared by solution blending with polyaniline encapsulated graphene nanoplatelets nanocomposites.

Morphological changes on graphene nanoplatelets induced during dispersion into an epoxy resin by different methods

2015 ◽  
Vol 72 ◽  
pp. 199-205 ◽  
Author(s):  
R. Moriche ◽  
S.G. Prolongo ◽  
M. Sánchez ◽  
A. Jiménez-Suárez ◽  
M.J. Sayagués ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Morphological Changes ◽  
Graphene Nanoplatelets

Enhanced Thermal Conductivity for Graphene Nanoplatelets/Epoxy Resin Composites

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Dahai Zhu ◽  
Yu Qi ◽  
Wei Yu ◽  
Lifei Chen ◽  
Mingzhu Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Epoxy Resin ◽  
Mass Fraction ◽  
Great Influence ◽  
Graphene Nanoplatelets ◽  
Resin Matrix ◽  
Heat Conducting ◽  
Factors Affecting ◽  
Molding Method ◽  
Ep Matrix

Graphene nanoplatelets (GNPs) have excellent thermal conductivity. It can significantly improve the heat-conducting property of epoxy resin (EP) matrix. In this paper, the GNPs/EP composites were successfully prepared by using ultrasonication and the cast molding method. The prepared GNPs/EP composites were systematically characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermal conductivity analyzer. Some factors affecting the thermal transfer performance of the composites were discussed. The defoamation has great influence on the thermal conductivity of composite. There is a nearly linear relationship between the mass fraction and the thermal conductivity of composite when the mass fraction of GNPs is below 4.3%. The results show that when the mass fraction of GNPs is 4.3% with crushing time of 2 s, the thermal conductivity of GNPs/EP composite is up to 0.99 W/m K. The thermal conductivity is increased by 9.0% compared with that without pulverization treatment (0.91 W/m K). When it is ground three times, the thermal conductivity of composite reaches the maximum (1.06 W/m K) and it is increased by 307.7% compared with that of epoxy resin matrix.

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