Article
Materials Science, Multidisciplinary
Zengqiang Cao, Xiaoyu Huang, Yanqing Wang, Chaoyang Zhang, Xianggui Xue, Guansong He, Hongyan Wang, Yuxiang Ni
Summary: In this study, the thermal stability of explosive HMX was improved by grafting different functional groups (hydroxyl, carboxyl, and butyl) on the surface of graphene. Molecular dynamics simulations were used to study the thermal transport across the graphene-HMX interface. The results showed that a covalent functionalization coverage rate of less than 7.5% was not beneficial for heat transfer, but increasing the coverage rate significantly enhanced the interfacial thermal conductance (ITC). Among the functional groups studied, butyl had the greatest impact on ITC, increasing it by 48.5% compared to pristine graphene-HMX. The results from molecular dynamics simulations were also used to predict the effective thermal conductivity of graphene-HMX composites using an effective medium theory-based model, and the major factors influencing the composite thermal conductivity were identified. This study enhances the understanding of heat transport in HMX composites and provides guidance for the structural design of thermally conductive HMX-based explosives.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Physics, Applied
M. Oleszko, A. Felix, R. Tomala, M. Chaika, W. Strek
Summary: This study investigates the effect of vacuum level on laser induced white emission (LIWE) of graphene foam and compares it with the electric incandescence of tungsten wire. The increase in pressure inside the dynamic vacuum chamber reduces the emission intensity of LIWE, while it has no effect on the emission of the electrically driven tungsten wire. A similar dependency is observed in the case of field emission (FE) of carbon cathodes. This analogy confirms that white emission and FE are coincident processes occurring during laser excitation of graphene foam.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Michael Davidovich, Igor S. Nefedov, Olga E. Glukhova, Michael M. Slepchenkov
Summary: A static model is proposed for calculating tunneling current in vacuum resonant tunneling triodes and tetrodes with control grids. The model allows for the inclusion of one or two grids in the structure, particularly those under the same voltage. It demonstrates the possibility of high current densities up to 10^(13) A/m(2) in structures with double quantum wells.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Bruno Lepetit
Summary: A new time-independent perturbative quantum method was used to quantitatively study electron field emission from two dimensional materials, showing that emission from graphene follows a modified FN law with a low current level mostly resulting from defects in the material. Our study provides insight into the emission mechanism in graphene.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Polymer Science
Santosh Kumar, Abir Saha
Summary: The study found that adding a relatively low concentration of graphene nanoplatelets can significantly enhance the physical, mechanical, thermal, and fracture properties of microwood particle-reinforced epoxy composites, while higher wood particle loading can cause agglomeration and weaken the bonding with the epoxy matrix, leading to decreased properties.
IRANIAN POLYMER JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Girish Rughoobur, Lay Jain, Akintunde Akinwande
Summary: Experimental demonstration of electron transmission through suspended graphene layers with significant increase in current, possibly due to generation of secondary electrons by primary electrons. Monolayer graphene shows highest output current at approximately 90 eV, up to 1.7 times the incident current, offering potential for low-voltage field emission electron sources in less stringent vacuum environments.
Article
Physics, Applied
Yang Zhou, Peng Zhang
Summary: This study investigates photoelectron emission from metal surfaces with laser wavelengths ranging from 200 to 1200 nm using a quantum model. It shows that non-equilibrium electron heating from intense sub-picosecond laser pulses can nonlinearly increase quantum efficiency, which is strongest when the cathode work function is a multiple of the laser photon energy. By reproducing previous experimental results, the quantum model with laser heating effects validates the importance of laser heating in electron emission mechanisms.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Bruno Lepetit
Summary: In this study, a simple quantum perturbative full dimensionality model based on the Bardeen transfer Hamiltonian formalism is presented to investigate the field emission from a graphene blade. The electronic wavefunction of the material is obtained using a multidimensional square well potential that is specifically designed to reproduce the Fermi level and the shape of the emitting orbitals. The wavefunction in the vacuum region between the electrodes is obtained using a close coupling method. The model provides the emitted current density as a function of the applied field, allowing for the discrimination of different functional forms used to fit the Fowler-Nordheim emission curves. Additionally, the model provides information on emission patterns and computes the electron total energy distributions for different field intensities, which are compared with theoretical and experimental results.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Tianzeng Hong, Chan Guo, Yu Zhang, Runze Zhan, Peng Zhao, Baohong Li, Shaozhi Deng
Summary: This study investigates the nucleation and growth mechanism of vertical few-layer graphene (VFLG) on different substrates and finds that the properties of substrates have a significant impact on the initial nucleation and growth of VFLG. The quality of VFLG is less related to the substrate and more influenced by growth conditions. Additionally, the study shows that the conductivity of VFLG is similar on different substrates, but the interfacial contact resistance varies greatly. Stainless-steel substrate is found to be the most favorable for electrical applications.
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Nikolay Kurochitsky, Pavel Pivovarov, Maxim Rybin, Elena Obraztsova
Summary: A new method for fabricating graphene field emitters on various substrates at room temperature and in ambient environment is presented. The desired shape and orientation of graphene flakes along the field are achieved through blister-based laser-induced forward transfer of high-quality single-layer graphene synthesized by chemical vapor deposition. This technique allows the formation of emitting crumpled graphene patterns without compromising the quality of initially synthesized graphene.
Article
Chemistry, Multidisciplinary
Anna Kuzmina, Markus Parzefall, Patrick Back, Takashi Taniguchi, Kenji Watanabe, Achint Jain, Lukas Novotny
Summary: By controlled stacking of graphene layers, the limitation of single-layer graphene as a material for light-emitting devices has been overcome, enabling twist-controlled resonant light emission. Experimental findings show light emission irrespective of the crystallographic alignment between the graphene electrodes, with a spectrally tunable resonant peak in the near-infrared range.
Article
Engineering, Chemical
Abqaat Naseer, Faiz Ahmad, Saad Ali, Waseem Haider
Summary: The challenges of inhomogeneous distribution, poor interfacial interaction, and agglomeration of graphene sheets in sintered metal composites were addressed by grafting metal oxides on graphene nanoplatelets. The grafted nanoparticles improved the dispersion and interaction with the copper matrix, resulting in restricted agglomeration and improved distribution of graphene in the copper matrix. This bridged interaction between bulk copper and graphene in sintered samples has significant implications for enhancing the mechanical and physical properties.
Article
Engineering, Electrical & Electronic
M. I. Ghouri, E. Ahmed, Absar Ali, M. Ramzan, Muhammad Irfan
Summary: The research focused on developing a highly efficient visible light responsive photocatalyst to enhance the hydrogen generation rate from water splitting. The synthesized heterostructure compositions showed improved light absorption, separation of charge carriers, and enhanced photocatalytic activity. The intimate interfacial contacts and synergism between different components contributed to the effective migration of photo-generated electrons, inhibiting charge recombination and enhancing photoactivity.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Energy & Fuels
Rui Zhang, Huan Pang
Summary: Graphene, with its distinguished structure and excellent physicochemical properties, has great application potential as electrode material in supercapacitors. Recent research has reviewed the synthesis and application of porous electrode graphene materials in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Environmental Sciences
Prateekshya Suman Sahu, Ravi Prakash Verma, Chetna Tewari, Nanda Gopal Sahoo, Biswajit Saha
Summary: This study proposed a two-step method for synthesizing EDTA@Fe3O4@GO as a chelating agent, demonstrating its high adsorption efficiency and reusability, providing new insights into large-scale wastewater treatment.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Chemistry, Multidisciplinary
Vishakha Kaushik, Jaehong Lee, Juree Hong, Seulah Lee, Sanggeun Lee, Jungmok Seo, Chandreswar Mahata, Taeyoon Lee
Article
Materials Science, Multidisciplinary
Vishakha Kaushik, A. K. Shukla, V. D. Vankar
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2014)
Article
Materials Science, Multidisciplinary
Vishakha Kaushik, H. Sharma, P. Girdhar, A. K. Shukla, V. D. Vankar
MATERIALS CHEMISTRY AND PHYSICS
(2011)
Article
Materials Science, Multidisciplinary
Himani Sharma, V. Kaushik, P. Girdhar, V. N. Singh, A. K. Shukla, V. D. Vankar
Article
Materials Science, Multidisciplinary
Vishakha Kaushik, A. K. Shukla, V. D. Vankar
Article
Materials Science, Multidisciplinary
Vishakha Kaushik, Himani Sharma, A. K. Shukla, V. D. Vankar
Article
Chemistry, Multidisciplinary
Vivek Kumar, Shailendra K. Saxena, Vishakha Kaushik, Kapil Saxena, A. K. Shukla, Rajesh Kumar
Article
Chemistry, Multidisciplinary
Vishakha Kaushik, Shunhe Wu, Hoyoung Jang, Je Kang, Kyunghoon Kim, Ji Won Suk
Article
Materials Science, Multidisciplinary
Vishakha Kaushik, Sachin Pathak, H. Sharma, A. K. Shukla, V. D. Vankar
Article
Chemistry, Physical
Vishakha Kaushik, Hardik L. Kagdada, Dheeraj K. Singh, Sachin Pathak
Summary: The study explores hybrid SERS substrates prepared by coating silver nanoparticles on graphene layers, utilizing both chemical and electromagnetic enhancement mechanisms for remarkable SERS intensities. The experiment and theory demonstrate substantial enhancement in electronic and vibrational properties of graphene fragments through interactions with small silver clusters, leading to enhanced G-band intensity. This research contributes to the understanding of mechanisms and the development of high-performance SERS substrates for sensing applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Condensed Matter
Vishakha Kaushik, Sachin Pathak, H. Sharma, S. Sachdev, S. Anwer, C. Prakash
Summary: A theoretical approach using first-principle calculations of the density of states (DOS) of functionalized carbon nanotubes (CNTs) is carried out to understand their enhanced electron field emission (FE) properties. The study reveals that edge functionalization of CNTs leads to significant changes in the band structure, DOS, and work functions, impacting the field emission properties.
PHYSICA B-CONDENSED MATTER
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
P. Bamola, A. Bhoumik, C. Dwivedi, V Kaushik, H. Sharma
MATERIALS TODAY-PROCEEDINGS
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
C. V. Dharinadhikari, S. K. Kolekar, Kaushik Vishakha, V. D. Vankar, S. P. Patole, J. B. Yoo
2014 27TH INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE (IVNC)
(2014)
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.
