Article
Chemistry, Multidisciplinary
Yiyu Zhang, Dasari Venkatakrishnarao, Michel Bosman, Wei Fu, Sarthak Das, Fabio Bussolotti, Rainer Lee, Siew Lang Teo, Ding Huang, Ivan Verzhbitskiy, Zhuojun Jiang, Zhuoling Jiang, Jianwei Chai, Shi Wun Tong, Zi-En Ooi, Calvin Pei Yu Wong, Yee Sin Ang, Chit Siong Lau, Kuan Eng Johnson Goh
Summary: This study reports the use of large-area liquid-metal-printed ultrathin Ga2O3 dielectrics for 2D electronics and optoelectronics. The conformal nature of liquid metal printing enables atomically smooth Ga2O3/WS2 interfaces. The compatibility of atomic layer deposition with Ga2O3/HfO2 top-gate dielectric stacks on monolayer WS2 is demonstrated, achieving small equivalent oxide thicknesses and subthreshold swings. These results show that liquid-metal-printed oxides can fill a crucial gap in dielectric integration of 2D materials.
Article
Nanoscience & Nanotechnology
Binxi Liang, Anjian Wang, Jian Zhou, Shihao Ju, Jian Chen, Kenji Watanabe, Takashi Taniguchi, Yi Shi, Songlin Li
Summary: Device passivation through ultraclean hexagonal BN encapsulation is an effective method to construct high-quality atomically thin semiconductor devices. This study successfully integrates lithography-defined contacts into BN-encapsulated 2D FETs, resulting in device quality comparable to pure dry transfer processing. The electronic characterization shows low scanning hysteresis, low density of interfacial charged impurities, and high charge mobility in WSe2 and MoS2 channels.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
F. T. Vasko
Summary: 2D electrons trapped in vacuum near the atomically thin dielectric (ATD) are studied, showing that the polarizability effect of ATD is weak when N <= 5. Analysis of momentum and energy relaxation rates reveals significant variations in momentum relaxation times across different temperature and concentration ranges.
JOURNAL OF APPLIED PHYSICS
(2021)
Review
Chemistry, Multidisciplinary
Sejeong Kim
Summary: Two-dimensional materials have been widely used in various scientific research areas and the concept of constructing photonic devices exclusively from 2D materials has emerged. This review introduces photonic devices solely consisting of 2D materials, including photonic waveguides, lenses, and optical cavities. These devices enable the thinnest possible devices due to their high refractive index, and the unique characteristics of 2D materials may provide intriguing applications.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
Yoon-jeong Kim, Minsung Kang, Yang Hui Kim, Eun-Kyung Suh, Minseok Yang, Se Yeon Cho, Dae-Young Jeon, Jeung Gon Kim, Jungmo Kim, Seokhoon Ahn
Summary: This paper introduces contorted hexabenzocoronene (c-HBC) derivatives as a potential universal precursor for synthesis of carbon materials with dimensions ranging from 1-D to 3-D. By controlling the assembly dimensions and intermolecular interactions of c-HBC derivatives, carbon products with different dimensions and high crystallinity can be synthesized. The use of copper vapor allows further control of crystallinity, and the carbonization process of c-HBC enables the growth of graphene-like structures on arbitrary substrates.
Article
Engineering, Environmental
K. Harikrishnan, Gajendar Singh, Amisha Kushwaha, Varun Pratap Singh, Umesh Kumar Gaur, Manu Sharma
Summary: The presence of organic pollutants in the environment poses significant health risks, therefore, monitoring and controlling their levels is imperative. In this study, g-C3N4/BN nanocomposites were synthesized and used as a basis for an electrochemical sensor for detecting hazardous hydroquinone. The sensor demonstrated good sensitivity and practicality.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jinzhi Sheng, Qi Zhang, Minsu Liu, Zhiyuan Han, Chuang Li, Chongbo Sun, Biao Chen, Xiongwei Zhong, Ling Qiu, Guangmin Zhou
Summary: The use of an ultrathin hBN/PI layer on a commercial PP separator effectively suppresses dendrite growth in lithium-ion batteries and reduces active lithium consumption, while also providing good electrolyte wettability, mechanical strength, thermal conductivity, and high thermal stability. This modification results in stable battery capacity even after long cycling and at high temperatures.
Article
Chemistry, Physical
Joel I-J Wang, Megan A. Yamoah, Qing Li, Amir H. Karamlou, Thao Dinh, Bharath Kannan, Jochen Braumuller, David Kim, Alexander J. Melville, Sarah E. Muschinske, Bethany M. Niedzielski, Kyle Serniak, Youngkyu Sung, Roni Winik, Jonilyn L. Yoder, Mollie E. Schwartz, Kenji Watanabe, Takashi Taniguchi, Terry P. Orlando, Simon Gustavsson, Pablo Jarillo-Herrero, William D. Oliver
Summary: The dielectric loss of hexagonal boron nitride (hBN) thin films in the microwave regime was studied by measuring the quality factor of parallel-plate capacitors (PPCs) made of NbSe2-hBN-NbSe2 heterostructures integrated into superconducting circuits. The research findings showed that hBN can be a promising dielectric material for building high-coherence quantum circuits with substantially reduced footprint and reduced qubit cross-talk. The integration of hBN and NbSe2 parallel-plate capacitors with aluminium Josephson junctions can realize transmon qubits with coherence times reaching 25 µs.
Article
Nanoscience & Nanotechnology
Seyed Mehdi Sattari-Esfahlan, Hyoung Gyun Kim, Sang Hwa Hyun, Jun-Hui Choi, Hyun Sik Hwang, Eui-Tae Kim, Hyeong Gi Park, Jae-Hyun Lee
Summary: We successfully improved and stabilized the electrical properties of a graphene field effect transistor by fabricating a sandwiched amorphous boron nitride (a-BN)/graphene (Gr)/a-BN using a directly grown a-BN film. The a-BN film was grown via low-pressure chemical vapor deposition (LPCVD) at a low growth temperature of 250 degrees C and applied as a protection layer in the sandwiched structure. The stability of the device under exposure to ambient air was analyzed using Raman spectra.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
Junkai Ren, Plinio Innocenzi
Summary: Hexagonal boron nitride (h-BN) is a highly attractive 2D material due to its remarkable properties, and its combination with other components to form heterostructures shows great potential for developing advanced functional devices. High-quality 2D h-BN structures with fewer defects can maximize its intrinsic properties, while controlled introduction of multiple defects in 2D h-BN can create new properties and advanced functions. Engineering of heterojunctions, including interface bonding design, plays a crucial role in developing advanced applications based on h-BN heterostructures in the future.
Article
Materials Science, Multidisciplinary
Laith A. Algharagholy, Hatef Sadeghi, Amaal A. Al-Backri
Summary: Covalently bonded carbon and boron nitride heteronanotubes can selectively sense trinitrotoluene and triacetone triperoxide. By creating and tuning energy band gaps in the heteronanotubes, new resonances are formed for detection purposes. The presence of different compounds leads to specific Seebeck coefficients, enabling the selective sensing of these species.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Min Zhou, Shanrong Li, Sibo Wang, Zhifeng Jiang, Can Yang, Fangsong Guo, Xinchen Wang, Wing-kei Ho
Summary: Ultrathin boron carbon nitride (BCN) nanosheets, as a fascinating candidate for advanced photocatalysis, have limitations in catalytic efficiency due to slow kinetics of surface/interfacial photoexcitation charges and visible photons absorption. A hierarchically layered heterostructure BCN-ZnIn2S4 is designed and constructed to accelerate charge separation/mobility and provide more active sites. The optimized BCN-ZnIn2S4 composite shows significantly enhanced photo-redox efficiency under visible light.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Chemical
Jeong-Hwan Oh, Minseok Kim, Seung-Hyun Hong, Yong Hee Lee, Tae-Hee Kim, Sooseok Choi
Summary: In this study, c-BN nanoparticles were successfully synthesized using a thermal plasma jet system at atmospheric pressure. The average particle size was 22 nm, and the major crystal structure was cubic. A high production yield was achieved without requiring pre-and post-processing.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Optics
G. L. Whitworth, J. Jaramillo-Fernandez, J. A. Pariente, P. D. Garcia, A. Blanco, C. Lopez, C. M. Sotomayor-Torres
Summary: Passive daytime radiative cooling is a promising approach for addressing global energy demand associated with refrigeration technologies, by enhancing the emittance of polar dielectric surfaces. The use of self-assembled silica photonic crystals has shown potential in achieving significantly lower temperatures through outcoupling surface-phonon polaritons (SPhPs) into free-space. Additionally, the simulation of soda-lime glass micro-shells also suggests a considerable reduction in temperature below ambient levels.
Article
Chemistry, Multidisciplinary
Shuo Chen, Xiaohu Wu, Ceji Fu
Summary: Phonon polaritons in extremely anisotropic media with ultralow losses and high confinement have provided new possibilities for controlling light at the nanoscale. This study compares the differences in polaritons between 2D and 3D models for biaxial vdW slabs, and reveals the relationship between the difference and the inverse of the dielectric function along different crystal directions.
Article
Engineering, Mechanical
Mengyu Lin, Aneta Nemcova, Andrey A. Voevodin, Andras Korenyi-Both, Tomasz W. Liskiewicz, Nicolas Laugel, Allan Matthews, Aleksey Yerokhin
Summary: The duplex coatings on AA6082 alloy exhibited significant improvement in fretting wear resistance and friction reduction compared to single-layer coatings. By reducing contact pressure, the topcoat's lubricating behavior was retained, resulting in high wear resistance and elimination of fatigue damage after 10^4 cycles.
TRIBOLOGY INTERNATIONAL
(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
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
Engineering, Electrical & Electronic
Chukwudi E. Iheomamere, Corey L. Arnold, Jason Summers, Richard F. Reidy, Andrey A. Voevodin, Nigel D. Shepherd
Summary: RF magnetron sputtering of h-BN onto unheated substrates produced a-BOxNy films, with surface roughness improving and pinholes eliminated as deposition pressure increased. The a-BOxNy/ZnO interface transition from accumulation to inversion required about 2 V.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(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, Mechanical
E. Cairns, A. Ayyagari, C. McCoy, S. Berkebile, D. Berman, S. M. Aouadi, A. A. Voevodin
Summary: The tribological behavior of MoS2 and WS2 transition metal dichalcogenide (TMD) spray coatings in low-viscosity hydrocarbon environments was studied. The coatings reduced friction on steel surfaces across all test conditions, with the largest reductions observed in dry nitrogen and dodecane environments. The reduced oxidation and uninhibited sliding of TMD sheets were identified as the main reasons for the friction reductions in dodecane.
TRIBOLOGY INTERNATIONAL
(2023)
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.
