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.
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
Multidisciplinary Sciences
Suman Kumar Chakraborty, Baisali Kundu, Biswajeet Nayak, Saroj Prasad Dash, Prasana Kumar Sahoo
Summary: Two-dimensional materials and heterostructures have great potential for future electronics, optoelectronics, and quantum technologies. They provide a unique way to control various physical phenomena, and the controlled fabrication of electronic grade 2D heterojunctions is crucial. However, challenges such as device-to-device variations, reliability, stability, and performance need to be addressed, and further research is required for real-world applications of novel devices based on 2D heterostructures.
Article
Multidisciplinary Sciences
Sheng Wang, Seokjae Yoo, Sihan Zhao, Wenyu Zhao, Salman Kahn, Dingzhou Cui, Fanqi Wu, Lili Jiang, M. Iqbal Bakti Utama, Hongyuan Li, Shaowei Li, Alexander Zibrov, Emma Regan, Danqing Wang, Zuocheng Zhang, Kenji Watanabe, Takashi Taniguchi, Chongwu Zhou, Feng Wang
Summary: Surface plasmons in mixed-dimensional heterostructures can be highly modulated with electrostatic gating, possibly due to plasmon hybridization. The ability to modulate plasmon wavelengths and retain high figures of merit in the 1D-2D heterostructure suggests potential for diverse designs of tunable plasmonic nanodevices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Ghulam Hussain, Mazia Asghar, Muhammad Waqas Iqbal, Hamid Ullah, Carmine Autieri
Summary: Based on first-principles calculations, this study investigates the structural stability, electronic structures, and thermal properties of monolayer XSi2N4 and its lateral and vertical heterostructures. The results show that these heterostructures are energetically and dynamically stable, and possess semiconductor properties with good heat retention ability. Therefore, they are potential candidates for nanoelectronics and thermoelectric applications.
APPLIED SURFACE SCIENCE
(2022)
Review
Nanoscience & Nanotechnology
Qinghua Hao, Hongwei Dai, Menghao Cai, Xiaodie Chen, Yuntong Xing, Hongjing Chen, Tianyou Zhai, Xia Wang, Jun-Bo Han
Summary: This article reviews the recent progress in emergent 2D magnetic heterostructures and spintronic devices, introducing the methods for constructing and characterizing these structures, summarizing the compositions of various magnetic heterostructures and the device performance of spintronic devices.
ADVANCED ELECTRONIC MATERIALS
(2022)
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)
Article
Chemistry, Multidisciplinary
Wei Wang, Lijun Zhou, Sheng Hu, Konstantin S. Novoselov, Yang Cao
Summary: This study reports a technique for mapping piezoelectric potential on 2D materials bubbles, successfully visualizing strain-induced piezoelectric potential profiles on the bubbles. Factors affecting these piezoelectric properties are discussed, providing insights for designing piezoelectric nanodevices based on 2D nanobubbles.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Yunpeng Qu, Jianzhe Sun, Mengfei Xue, Debo Hu, Bin Wu, Chi Li, Jianing Chen, Mengkun Liu, Zhipei Sun, Yunqi Liu, Peining Li, Shanhui Fan, F. Javier Garcia de Abajo, Qing Dai
Summary: In this study, we report a topological transition in the isofrequency dispersion contours of hybrid polaritons supported by a two-dimensional heterostructure consisting of graphene and alpha-phase molybdenum trioxide. By chemically changing the doping level of graphene, we observed a transformation of the topology of polariton isofrequency surfaces. Moreover, when the substrate was changed, the dispersion contour became dominated by flat profiles at the topological transition, thus supporting tunable diffractionless polariton propagation.
NATURE NANOTECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Minsu Kim, Kyung Yeol Ma, Hyeongjoon Kim, Yeonju Lee, Jong Hyun Park, Hyeon Suk Shin
Summary: With advances in flexible electronics, innovative foldable, rollable, and stretchable displays have been developed to maintain their performance under various deformations. These flexible devices can develop more innovative designs than conventional devices due to their light weight, high space efficiency, and practical convenience. However, developing flexible devices requires material innovation because the devices must be flexible and exhibit desirable electrical insulating/semiconducting/metallic properties. Recently, emerging 2D materials such as graphene, hexagonal boron nitride, and transition metal dichalcogenides have attracted considerable research attention because of their outstanding electrical, optical, and mechanical properties, which are ideal for flexible electronics. This review discusses the recent progress and challenges of 2D material growth and display applications, and provides perspectives for exploring 2D materials for display applications.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Junwei Chu, Yang Wang, Xuepeng Wang, Kai Hu, Gaofeng Rao, Chuanhui Gong, Chunchun Wu, Hao Hong, Xianfu Wang, Kaihui Liu, Chunlei Gao, Jie Xiong
Summary: The emergence of 2D polarized materials has demonstrated unique quantum behaviors at atomic scales and their applications in information storage and processing have developed significantly in recent years. This review focuses on the basic 2D polarized materials system and their applications in spintronics, valleytronics, and electronics, highlighting the underlying physical mechanisms, symmetry broken theory, and modulation process through heterostructure engineering. These summarized works will continue to enrich the understanding of 2D quantum systems and promising practical applications.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xinhou Chen, Hangtian Wang, Haijiang Liu, Chun Wang, Gaoshuai Wei, Chan Fang, Hanchen Wang, Chunyan Geng, Shaojie Liu, Peiyan Li, Haiming Yu, Weisheng Zhao, Jungang Miao, Yutong Li, Li Wang, Tianxiao Nie, Jimin Zhao, Xiaojun Wu
Summary: Developing atomically thin, ultracompact, and ultrafast spintronic devices is crucial for future low-dissipation quantum computation, high-speed storage, and on-chip communication applications. This study successfully realizes optical THz spin-current bursts at room temperature in the 2D van der Waals ferromagnetic Fe3GeTe2 integrated with a topological insulator, providing a foundation for achieving all-optical generation of ultrafast THz spin currents in room-temperature 2D magnetism.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Sangkha Borah, Dinesh Yadav, Maxim Trushin, Fabian Pauly
Summary: This study presents a comprehensive ab initio investigation of the hot carrier dynamics at the h-BN/graphene interface. The results show that there is a weak coupling between low-energy optical phonons and electrons at the h-BN/graphene interface, leading to a reduced thermalization bottleneck effect compared to other bilayer and multilayer structures.
Article
Chemistry, Multidisciplinary
Leining Zhang, Peng Peng, Feng Ding
Summary: The study reveals that the step density on high-index surfaces plays a crucial role in the epitaxial growth of 2D single crystals, while surface roughness and alignment of step edges are important factors affecting the orientation of hBN. High-index surfaces with large step density are robust for templating the epitaxial growth of 2D single crystals.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Bingyao Liu, Yu -Tian Zhang, Ruixi Qiao, Ruochen Shi, Yuehui Li, Quanlin Guo, Jiade Li, Xiaomei Li, Li Wang, Jiajie Qi, Shixuan Du, Xinguo Ren, Kaihui Liu, Peng Gao, Yu -Yang Zhang
Summary: We investigated the twist-angle-dependent coupling effects of h-BN/graphene heterostructures and found that moire potentials alter the band structure of graphene, resulting in a redshift of the intralayer transition at the M point. We also observed tunable vertical transition energies in the range of 5.1-5.6 eV due to the twisting of the Brillouin zone of h-BN relative to the graphene M point. These findings highlight the importance of considering twist-coupling effects in device fabrications and the potential of twist angles to design optoelectrical devices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Sathvik Ajay Iyengar, Anand B. Puthirath, Venkataraman Swaminathan
Summary: This perspective provides a brief overview of quantum materials and their prospects for applications in the fields of quantum information science, spintronics, valleytronics, and twistronics, as well as the material and processing challenges that will affect the realism of these applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jamil Islam, Parthiba Karthikeyan Obulisamy, Venkata K. K. Upadhyayula, Alan B. Dalton, Pulickel M. Ajayan, Muhammad M. Rahman, Manoj Tripathi, Rajesh Kumar Sani, Venkataramana Gadhamshetty
Summary: In this study, the use of graphene layers on copper surfaces for microbially driven methanol dehydrogenation to generate DC electricity was investigated. The results showed that the graphene layers significantly improved the power density and current density. This catalyst-free approach has important implications for enhancing the sustainability of fuel cell technologies.
Article
Chemistry, Multidisciplinary
Soumyabrata Roy, Firuz Alam Philip, Eliezer Fernando Oliveira, Gurwinder Singh, Stalin Joseph, Ram Manohar Yadav, Aparna Adumbumkulath, Sakib Hassan, Ali Khater, Xiaowei Wu, Praveen Bollini, Ajayan Vinu, George Shimizu, Pulickel M. Ajayan, Md Golam Kibria, Muhammad M. Rahman
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Physics, Applied
Gustavo A. Alvarez, Joyce Christiansen-Salameh, Abhijit Biswas, Anand B. Puthirath, Eugene Jeong, Jinha Kwon, Jaejun Lee, Tia Gray, Robert Vajtai, Pulickel M. Ajayan, Zhiting Tian
Summary: The unique properties of hexagonal boron nitride (h-BN), including its atomically smooth surface, large critical electric field, and large electronic bandgap, make it an excellent material for thin film microelectronics and ultrawide bandgap semiconductors. The anisotropic thermal conductivity of h-BN, due to weak van der Waals interactions between layers, has been extensively studied for in-plane thermal conductivity, but there is limited data on cross-plane thermal conductivity for thin films grown by practical methods like pulsed laser deposition (PLD). In this study, h-BN films were grown using PLD and their thickness-dependent cross-plane thermal conductivity (k(perpendicular to)) was investigated, revealing a decreasing trend as thickness increases from 30 to 300 nm.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Condensed Matter
J. M. De Sousa, L. D. Machado, C. F. Woellner, M. Medina, P. A. S. Autreto, D. S. Galvao
Summary: The mechanical response and fracture dynamics of BNNT-peapods under ultrasonic velocity impacts were investigated. Reactive molecular dynamics simulations were carried out, considering horizontal and vertical shootings. Tube bending, tube fracture, and C-60 ejection were observed depending on the velocity values, with the nanotube unzipping for horizontal impacts at certain speeds.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Devashish Salpekar, Changxin Dong, Eliezer F. F. Oliveira, Valery N. N. Khabashesku, Guanhui Gao, Ved Ojha, Robert Vajtai, Douglas S. S. Galvao, Ganguli Babu, Pulickel M. M. Ajayan
Summary: Researchers have developed a bifunctional separator coated with fluorinated multiwalled carbon nanotubes, which improves capacity retention and reduces charge-transfer resistance in Li-S batteries. The study demonstrates the importance of utilizing electronegative fluorine moieties and absorption-based porous carbons to mitigate the polysulfide shuttle.
Article
Chemistry, Multidisciplinary
Jeremy P. Daum, Alec Ajnsztajn, Sathvik Ajay Iyengar, Jacob Lowenstein, Soumyabrata Roy, Guan-hui Gao, Esther H. R. Tsai, Pulickel M. Ajayan, Rafael Verduzco
Summary: Covalent organic frameworks (COFs) are a promising class of crystalline polymer networks with high porosity and versatile functionality. A chemical vapor deposition (CVD) approach is developed to produce highly crystalline COF films and coatings in a fast and facile manner. The synthesized COF films are characterized by various techniques and show potential applications in size exclusion membranes, catalytic platforms, and organic transistors.
Article
Chemistry, Multidisciplinary
Abhijit Biswas, Rui Xu, Joyce Christiansen-Salameh, Eugene Jeong, Gustavo A. Alvarez, Chenxi Li, Anand B. Puthirath, Bin Gao, Arushi Garg, Tia Gray, Harikishan Kannan, Xiang Zhang, Jacob Elkins, Tymofii S. Pieshkov, Robert Vajtai, A. Glen Birdwell, Mahesh R. Neupane, Bradford B. Pate, Tony Ivanov, Elias J. Garratt, Pengcheng Dai, Hanyu Zhu, Zhiting Tian, Pulickel M. Ajayan
Summary: In this research, the phase stability of 2D/3D h-BN/c-BN nanocomposites is investigated, showing that the coexistence of the two phases can result in strong nonlinear optical properties and low thermal conductivity at room temperature. Spark-plasma sintering of the nanocomposites demonstrates complete phase transformation to 2D h-BN with improved crystalline quality, where the nucleation and growth kinetics are possibly governed by 3D c-BN. These findings provide insights into phase engineering of BN polymorph-based nanocomposites with desirable properties for optoelectronics and thermal energy management applications.
Article
Materials Science, Multidisciplinary
Saloni Sharma, Rajesh Kumar, Ram Manohar Yadav
Summary: In this study, SERS active substrates made of polymer and nitrogen-doped graphene quantum dots (N-GQDs) were fabricated for the detection of methylene blue (MB). The synthesized PAN/N-GQDs nanocomposite films showed high sensitivity and selectivity, indicating their potential as nanosensors.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Livia Vasarhelyi, Daniel Sebok, Imre Szenti, Adam Toth, Sara Levay, Robert Vajtai, Zoltan Konya, Akos Kukovecz
Summary: Mixing is a fundamental process in practically every industry, but there is a lack of literature on its 3D analysis. High-resolution computed tomography (micro-CT) is an ideal X-ray imaging tool for investigating the mixing of granular materials. In addition to qualitative analysis, 3D micro-CT images provide an opportunity for quantitative analysis, which is crucial for the efficiency and environmental impact of the mixing process. This study proposes lacunarity as a measure of mixing, which allows for a temporal description of mixing in three dimensions. The lacunarity curve provides additional information about the spatial distribution of grains compared to traditional mixing indices. Discrete element method simulations showed similar results to the experiments.
OXFORD OPEN MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Md Abdullah Al Bari, Shariful Kibria Nabil, Shabab Saad, Rahul Sarkar, Sabrina Sabiha, Muhammad M. M. Rahman, Md Golam Kibria
Summary: There is growing interest in using carbon fibers in various applications due to their excellent mechanical, electrical, and thermal properties. Recent studies have identified asphaltene as a promising low-cost precursor for carbon fiber production, potentially accelerating its adoption. Techno-economic and life cycle assessments show that asphaltene-derived carbon fiber production can be cost-effective and offer climate benefits compared to current precursors.
Article
Chemistry, Physical
Caique C. Oliveira, Matheus Medina, Douglas S. Galvao, Pedro A. S. Autreto
Summary: The discovery of graphene has sparked interest in other 2D carbon-based materials. Researchers have proposed a new carbon allotrope, tetra-penta-deca-hexagonal-graphene (TPDH-graphene), which has unique topology and potential applications. Using DFT and reactive molecular dynamics simulations, we studied the hydrogenation dynamics of TPDH-graphene and its effects on its electronic structure, leading to the formation of well-defined pentagonal carbon stripes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Lanna E. B. Lucchetti, Pedro A. S. Autreto, James M. M. de Almeida, Mauro C. C. Santos, Samira Siahrostami
Summary: Improved catalysts are crucial for environmentally friendly and long-term oxygen electrochemical reactions. Computational catalysis can provide atomic level information for optimizing the next generation of electrocatalysts. This study investigates the role of different ceoria facets in enhancing catalytic activity for various oxygen electrochemical reactions, providing valuable insights for developing better catalysts.
REACTION CHEMISTRY & ENGINEERING
(2023)