Article
Chemistry, Multidisciplinary
Georgy Fedorov, Roohollah Hafizi, Vyacheslav Semenenko, Vasili Perebeinos
Summary: In this study, the effect of metal deformations on the gate voltage dependence of the conductance of metallic armchair and zigzag carbon nanotube field effect transistors (FETs) was investigated. It was found that the current-voltage characteristics of these FET devices are different from those expected for metallic carbon nanotubes. The gate-voltage dependence of the conductance in armchair CNTFETs shows an ON/OFF ratio of about a factor of two, nearly independent of temperature, attributed to deformation-induced modification of the band structure.
Article
Polymer Science
Stepan V. V. Lomov, Iskander S. S. Akmanov, Qiang Liu, Qi Wu, Sergey G. G. Abaimov
Summary: The temperature dependence of the electrical conductivity/resistivity of CNT networks is observed to be negative, especially for aligned CNTs (A-CNTs). This study investigates the role of three phenomena, namely the temperature dependence of the intrinsic conductivity of CNTs, the tunnelling resistance of their contacts, and thermal expansion of the network, on the temperature coefficient of resistance (TCR). The results show that the TCR of the CNTs themselves is the main factor influencing the TCR of the film, while the TCR of the tunnelling contacts and film thermal expansion have marginal effects.
Article
Materials Science, Composites
Saddiqa Begum, Hameed Ullah, Irfan Ahmed, Yiqiang Zhan, Ayesha Kausar, Muhammad Adeel Aleem, Saeed Ahmad
Summary: Oxidized and grafted multi-walled carbon nanotubes in PVDF matrix showed improved dispersion and enhanced electrical properties, making them suitable for various energy applications. The nanocomposites exhibited well crystalline structure and uniform distribution of nanotubes, leading to the formation of beta-phase and improved electrical conductivity.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Materials Science, Characterization & Testing
Seyed Rasoul Mousavi, Sara Estaji, Hediyeh Kiaei, Mohammad Mansourian-Tabaei, Sasan Nouranian, Seyed Hassan Jafari, Holger Ruckdaeschel, Mohammad Arjmand, Hossein Ali Khonakdar
Summary: This article provides an overview of the recent advances in research on improving the thermal and electrical conductivities of EP resin systems modified with CNT, Gr, their derivatives, and hybrids. Surface modification of these reinforcements is also discussed as a means to enhance the dispersion of nanofillers in EP resins.
Article
Materials Science, Composites
Shengfei Hu, Bingfeng Xu, Yang Zhao, Xudong Fu, Qingting Liu, Rong Zhang
Summary: Conductive and thermal conductive polymer composites with segregated network structures were prepared by the Pickering emulsion method. The inclusion of carbon nanotubes (CNTs) as bridges improved the conductivity and thermal conductivity of the composites. This study provides a convenient and time-saving approach for the study of segregated structural thermally conductive composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Kamil Dydek, Paulina Latko-Duralek, Agata Sulowska, Michal Kubis, Szymon Demski, Paulina Kozera, Bogna Sztorch, Anna Boczkowska
Summary: The study found that increasing MWCNT content leads to higher complex viscosity, storage modulus, and loss modulus, while decreasing the agglomerates' areal ratio; in terms of thermal properties, higher MWCNT content results in improved stability and crystallinity, with no significant impact from processing temperature.
Article
Chemistry, Physical
Slawomir Boncel, Jaroslaw Kaluzny, Jacek Rozanski, Beata Strzemiecka, Tomasz Runka, Lukasz Wojciechowski, Joanna Kujawa, Emil Korczeniewski, Artur P. Terzyk, Paulina Blaszkiewicz, Adam A. Marek, Anna Kolanowska, Rafal G. Jedrysiak, Szymon Ruczka, Grzegorz Dzido, Tomasz Gizewski
Summary: This study demonstrates the successful formation of stable and multifunctional CNT-PAO greases by using two types of multi-wall carbon nanotubes as thickeners and thermo- and electro-active agents. The mechanisms governing fast-thickening behavior and CNT-PAO affinities are analyzed, and the multifunctionality of CNT-PAO greases is revealed.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Taiyo Shimizu, Hideaki Nakajima, Kazufumi Kobashi, Takeo Yamada, Kenji Hata
Summary: The study focuses on controlling the electrical conductivities of CNT buckypapers by utilizing mixed dispersions of different types of CNTs, achieving seamless transitions between two sole counterparts. Additionally, an intriguing correlation between electrical conductivities and thermal diffusivities of the obtained buckypapers was discovered. This finding could provide valuable insights for applications involving both electrical and thermal conduction by CNTs.
Article
Engineering, Multidisciplinary
Yuan Fang, Long-yuan Li, Jean-Baptiste Mawule Dassekpo, Sung-Hwan Jang
Summary: An analytical prediction model for the heat transfer analysis of two-phase composite materials is developed, taking into account various factors influencing the effective properties of composite materials. The validation of the model using experimental data demonstrates the accuracy and reliability of the model.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Lin Qiu, Fengcheng Li, Ning Zhu, Yanhui Feng, Xiaoliang Zhang, Xiaohua Zhang
Summary: The poor heat conduction between carbon nanotubes (CNTs) has been a major obstacle in thermal management. In this study, a resonance mechanism was proposed to improve the heat conductance by exciting low-frequency vibrations through adding soft long-chain polymers to the contacted sites of CNTs. This research has significant implications for the development of advanced CNT-based thermal functional materials.
Article
Nanoscience & Nanotechnology
Chengfeng Zhang, Zhenghai Tang, Xinglong An, Shifeng Fang, Siwu Wu, Baochun Guo
Summary: By constructing segregated structures in sulfur-cured rubbers, polymer composites with high conductivity and good mechanical properties can be prepared, improving electrical conductivity while also enhancing modulus and stretchability.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Multidisciplinary
Gabriela Uribe-Riestra, Pedro Ayuso-Faber, Miguel Rivero-Ayala, Javier Cauich-Cupul, Fidel Gamboa, Francis Aviles
Summary: A method based on changes of electrical resistance was used to evaluate non-visible damage in multiscale hierarchical composites subjected to bending loads. Damage sensing was achieved by placing electrodes close to the specimens and correlated to strain fields measured by digital image correlation. The technique allowed the detection of initial damage and progression under cyclic loading and impact.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
R. Vignesh Babu, S. Kanagaraj
Summary: The performance of copper can be enhanced by the addition of carbon nanotubes as reinforcement, resulting in Cu/CNT composite materials with improved properties, particularly in terms of thermal conductivity. Through a special processing technique, such as molecular level mixing, cold isostatic pressing, and microwave sintering, the composites exhibit superior characteristics compared to conventional processing methods, showcasing promising potential for industrial applications.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Bihan Zhang, Leilei Zhang, Zhongkai Wang, Qian Gao
Summary: An innovative wood-derived carbon-carbon nanotubes-pyrolytic carbon composite material with significant compressive strength, excellent electrical conductivity, thermal stability, and mechanical properties was successfully fabricated. This material opens up a new approach for efficiently fabricating high-performance electronic device composites in high-temperature fields.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Engineering, Manufacturing
Jianwei Zhou, Zhongxun Yu, Yarong Lv, Ce Wang, Ping Hu, Yong Liu
Summary: This study proposes a novel strategy to construct thermally conductive networks using boron nitride nanosheets-multiwalled carbon nanotubes/poly(vinyl alcohol) nanocomposites. The resulting nanocomposites exhibit excellent in-plane thermal conductivity and heat dissipation capacity, providing inspiration for the preparation of composites with high thermal conductivity.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Physics, Applied
Hattan Abuzaid, Nicholas X. Williams, Aaron D. Franklin
Summary: Research in semiconducting 2D materials, particularly transition metal dichalcogenides, has shown promising potential in competing with silicon in various application areas. Despite the benefits, 2D materials still face challenges such as poor reliability, performance variability, and limited scalability in fabrication. Continuous research efforts and appropriate benchmarking are crucial for further development of 2D materials in future technologies.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Chen Shen, Shiheng Lu, Zhenhua Tian, Shujie Yang, Jorge A. Cardenas, Junfei Li, Xiuyuan Peng, Tony Jun Huang, Aaron D. Franklin, Steven A. Cummer
Summary: A structure featuring a thin-film transistor configuration is proposed to achieve electrically tunable SAW propagation based on conductivity tuning. The use of carbon nanotubes and crystalline nanocellulose as the channel and gate materials results in high tuning capacity and low gate voltage requirement. The proposed device exhibits a 2.5% phase velocity tuning and near 10 dB on/off switching of the signals.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Energy & Fuels
Mostafa Abuseada, Chuyu Wei, R. Mitchell Spearrin, Timothy S. Fisher
Summary: We report a process that converts methane to high-value graphitic carbon and hydrogen gas using simulated solar irradiation. The process involves capturing solid carbon in an easily extractable form through localized solar heating, while maintaining active deposition site density until flow is blocked. This method achieves high methane conversion and hydrogen yield.
Article
Engineering, Electrical & Electronic
Shulin Ye, Nicholas X. Williams, Aaron D. Franklin
Summary: This study demonstrates the printing of SU-8 with an aerosol jet printer as a viable passivation layer for conductive silver lines in ionic solutions. Extending the SU-8 film beyond the electrodes significantly reduced leakage current and improved stability. This research provides useful progress towards fully printed, stable electronic biosensing devices.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Thermodynamics
Akshay Bharadwaj Krishna, Kaiyuan Jin, Portonovo S. Ayyaswamy, Ivan Catton, Timothy S. Fisher
Summary: Heat exchangers are essential in supercritical CO2 Brayton cycles for waste heat recovery. These cycles operate at high temperatures and pressures to achieve higher energy density and thermal efficiency. Accurate estimation of heat exchanger performance is crucial for the design and optimization of sCO2 systems.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2022)
Article
Thermodynamics
Akshay Bharadwaj Krishna, Kaiyuan Jin, Portonovo S. Ayyaswamy, Ivan Catton, Timothy S. Fisher
Summary: This paper focuses on the performance modeling and correlations of heat exchangers in high-temperature supercritical CO2 Brayton cycles. The developed correlations for heat transfer and friction characteristics offer superior accuracy and versatility. The study validates the correlations using experimental and computational fluid dynamics data and demonstrates their applicability to supercritical CO2 heat exchangers.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2022)
Article
Thermodynamics
Yuan Hu, Mostafa Abuseada, Abdalla Alghfeli, Saurin Holdheim, Timothy S. Fisher
Summary: This study presents a method for measuring the thermal diffusivity of thin disk samples at high temperatures using a modified angstrom ngstrom's method, along with nondestructive temperature measurements using an infrared camera. The results demonstrate excellent agreement with reference values obtained by other methods, validating the accuracy of the proposed method.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2022)
Article
Physics, Fluids & Plasmas
Majed A. Alrefae, Gayathri Shivkumar, Alina A. Alexeenko, Sergey O. Macheret, Timothy S. Fisher
Summary: In this study, nanocrystalline graphitic films were successfully deposited on Cu foil in a roll-to-roll plasma-enhanced chemical vapor deposition system. The influence of discharge modes on the synthesis of graphitic films was investigated, and electrical and spectroscopic characterizations supported with modeling were performed. It was found that by adjusting the discharge modes, different qualities of nanocrystalline graphitic films could be produced without supplemental heating.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Instruments & Instrumentation
Abuseada Mostafa, Alghfeli Abdalla, Timothy S. Fisher
Summary: The paper presents a method for characterizing the output radiative flux of a solar simulator using an inverse mapping technique and custom instruments. This method allows for practical characterization of solar irradiation and provides a cost-effective means of monitoring the performance of solar sources over time.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Correction
Instruments & Instrumentation
Mostafa Abuseada, Abdalla Alghfeli, Timothy S. Fisher
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Materials Science, Multidisciplinary
Mostafa Abuseada, Abdalla Alghfeli, Timothy S. Fisher
Summary: This paper introduces a method to enhance heat spreading capabilities by synthesizing thin graphitic layers on organic substrates through a vacuum deposition process. The use of a light source that can be replaced with solar power enables rapid heating and improves growth rates over larger areas compared to laser processing, mitigating the issue of porosity in graphitic layers. Analysis of the enhanced organic substrates confirms graphitic conversion.
Article
Engineering, Electrical & Electronic
Abdalla Alghfeli, Mostafa Abuseada, Timothy S. Fisher
Summary: This study explores the use of solar-thermal energy to reduce greenhouse gas emissions in industrial processes. Through a solar simulator and a chemical vapor deposition system, high-quality graphene films are synthesized automatically. The results demonstrate the ability of the system to produce high-value products directly from renewable energy sources, and with process control and automation.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2022)
Article
Chemistry, Physical
Mostafa Abuseada, R. Mitchell Spearrin, Timothy S. Fisher
Summary: This article introduces a new solar-thermal methane pyrolysis process that produces hydrogen gas and high-value graphitic carbon product in a fibrous carbon medium. The process reaches steady-state operation quickly and the graphitic product can be easily extracted from the solar reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Multidisciplinary
Yuan Hu, Mostafa Abuseada, Abdalla Alghfeli, Saurin Holdheim, Timothy S. Fisher
Summary: This study proposes a Bayesian analysis method that uses a parametric surrogate model in the form of polynomial chaos to accelerate the thermal diffusivity physical model for high-temperature determination. The No-U-Turn sampler is employed to improve the efficiency of the MCMC sampler.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Energy & Fuels
Mostafa Abuseada, Timothy S. Fisher
Summary: This study presents a scalable route for continuous solar-thermal methane pyrolysis, using a roll-to-roll mode of operation with a fibrous carbon substrate. It converts natural gas into hydrogen and high-quality carbon product with virtually no CO2 emission, offering a promising solution to decarbonize fossil fuels.
