Investigation of temperature dependency of electrical resistance changes for structural management of graphite/polymer composite

Takahashi, Kosuke; Hahn, Hoh‐Gyu

doi:10.1177/0021998311416683

Cited by 45 publications

(34 citation statements)

References 36 publications

(44 reference statements)

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“…For the device with GMs, it is interesting that the α value is of ≈0.17 × 10 −3 K −1 , which is one order of magnitude smaller than that of Cu CFs. According to literatures, the resistivity of graphite decreases with increasing temperature with a temperature coefficient of ≈−1 × 10 −3 K −1 . This means the lower α of the Cu/a‐C/GMs/Ni device could be attributed to the existence of the GMs, furthermore, indicating the Cu CFs preferred to grow along the GMs.…”

mentioning

confidence: 73%

Graphite Microislands Prepared for Reliability Improvement of Amorphous Carbon Based Resistive Switching Memory

Ding

Tao

et al. 2018

Physica Rapid Research Ltrs

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Uniform graphite microislands (GMs) are prepared through catalytic graphitization of amorphous carbon (a-C) thin film. Taking advantage of the specific structural feature of the GMs, we demonstrate an effective approach to improve the reliability of amorphous carbon based resistive random access memory devices. Through investigating the temperature dependence of the high/low resistance states (HRS/LRS), it is verified that the conductive filaments (CFs) prefer to grow along the GMs. The enhancement of localelectric-field around the GMs can not only induce a lower forming/set voltage to largely avoid CFs overgrowth, but also simplify the CFs morphology. As a result, the relative fluctuation of HRS/LRS resistance reduces from 82.8%/ 46.3% to 27.4%/18.8%, respectively. In addition, the memory devices with GMs structure exhibit a low cycling degradation and good retention (>10 4 s at 85 C).Resistive random access memory (RRAM) devices possess various superior performance including fast programming speed, low power consumption and high density, which makes it a promising candidate for next-generation non-volatile memory and neuromorphic computing. [1][2][3][4] A great many materials have been explored as switching media for RRAMs over the past decades, such as oxides, [5] nitrides, [6] chalcogenides, [7] organics, [8] and others. [9,10] It is widely accepted that the formation and rupture of conductive filaments (CFs) accounts for the physical mechanism of resistive switching (RS). [11][12][13] Thus, the location, diameter, and geometrical morphology of CFs could have a strong impact on RS parameters, even on memory devices performance. [14][15][16] However, the specific features of CFs are uncontrollable, because the migration of metal (electrochemical metallization mechanism, ECM) or oxygen (valence change mechanism, VCM) ions is highly random in the condition of uniform electric-field. [17,18] This would result in a large fluctuation of RS parameters, such as high/low resistance state (HRS/LRS) and switching voltages (V set /V reset ), which is a main obstacle for practical applications. [19][20][21] Therefore, controlling CFs is the core topic for improving the performance of RRAM devices.Based on the current understanding on the working mechanism of RRAM, the redox process during the formation and rupture process of CFs is closely dependent on the electric field. [22] While, the electric-field is uniform near the planar electrode/insulating layer interface, leading to the equal opportunity of ions migration, which is the physical reason of the CFs uncontrollability. Thus, electric-field localization has been proposed as an effective method for controlling CFs. Many attempts have been made to enhance the local electric field (LEF), such as inserting metal nanodots, [23] introducing nanoinsulators, [24] or using tip electrode. [13,25] These approaches effectively controlled the conductive filament growth, obtaining better RS performance. However, it is still necessary to apply multiple function materials develop mo...

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confidence: 73%

Graphite Microislands Prepared for Reliability Improvement of Amorphous Carbon Based Resistive Switching Memory

Ding

Tao

et al. 2018

Physica Rapid Research Ltrs

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“…where R is the electrical resistance (Ω), R 0 the electrical resistance at room temperature conditions, (T 0 =20 0 C), a the CTE (10 -6 / 0 C for carbon fibre) and T the temperature ( 0 C). Takahashi et al [60] examined the dependency of the electrical resistance of a graphite /epoxy polymer on temperature.…”

Section: Current Injection Thermographymentioning

confidence: 99%

Current injection phase thermography for low-velocity impact damage identification in composite laminates

et al. 2014

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An innovative non-destructive evaluation (NDE) technique is presented based on current stimulated thermography. Modulated electric current is injected to Carbon Fibre Reinforced Plastics (CFRP) laminates as an external source of thermal excitation. Pulsed Phase Thermography (PPT) is concurrently employed to identify low velocity impact induced (LVI) damage. The efficiency of the proposed method is demonstrated for both plain and with Carbon Nanotubes (CNTs) modified laminates, which are subjected to low-velocity impact damaged composite laminates at different energy levels. The presence of the nano reinforcing phase is important in achieving a uniform current flow along the laminate, as it improves the through thickness conductivity. The acquired thermographs are compared with optical PPT, C-scan images and Computer Tomography (CT)representations. The typical energy input for successful damage identification with current injection is three to four orders of magnitude less compared to the energy required for optical PPT.

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“…(e-mails: catherine.e.jones@strath.ac.uk; patrick.norman@strath.ac.uk; stuart.galloway@strath.ac.uk; graeme.burt@strath.ac.uk) A. W Hamilton, A. Cleary, R. C. Atkinson, C. Michie, I. Andonovic and C. Tachtatzis are with the Centre for Intelligent Dynamic Communications properties of CFRP compared to metallic structures [2,3], has had a significant influence on how the EPS is integrated with composite aero-structures.…”

Section: Introductionmentioning

confidence: 99%

A Novel Methodology for Macroscale, Thermal Characterization of Carbon Fiber-Reinforced Polymer for Integrated Aircraft Electrical Power Systems

Jones

Hamilton

Norman

et al. 2019

IEEE Trans. Transp. Electrific.

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Carbon fibre reinforced polymer (CFRP) is increasingly used for aero-structure applications due to their high strength-to-weight ratio. The integration of the on-board electrical power system (EPS) with CFRP is challenging due to the requirement to thermally and electrically isolate these systems to meet existing safety standards. By capturing the thermal characteristics of CFRP at a macro (component) scale for CFRP components, it is possible to understand, and design for, the increased integration of the EPS into CFRP aero-components. A significant challenge is to develop a macroscale characterisation of CFRP which is not only of an appropriate fidelity for compatibility with systems level models of an EPS, but can be used to represent different geometries of CFRP components. This paper presents a novel methodology for capturing a transient, macro-scale thermal characterisation of CFRP with regards to component lay-up and geometry (thickness). The methodology uses experimentally derived thermal responses of specific resin and ply orientation CFRP samples to create generalised relationship for the prediction of thermal transfer in other sample thicknesses of same material type. This methodology can be used to characterise thermal gradients across CFRP components in aircraft EPS integration applications, ultimately informing the optimised integration of the EPS with CFRP.

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Investigation of temperature dependency of electrical resistance changes for structural management of graphite/polymer composite

Cited by 45 publications

References 36 publications

Graphite Microislands Prepared for Reliability Improvement of Amorphous Carbon Based Resistive Switching Memory

Graphite Microislands Prepared for Reliability Improvement of Amorphous Carbon Based Resistive Switching Memory

Current injection phase thermography for low-velocity impact damage identification in composite laminates

A Novel Methodology for Macroscale, Thermal Characterization of Carbon Fiber-Reinforced Polymer for Integrated Aircraft Electrical Power Systems

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