Article
Chemistry, Multidisciplinary
Qiucheng Li, Xiaolong Liu, Eden B. Aklile, Shaowei Li, Mark C. Hersam
Summary: The study reports the self-assembly of mixed-dimensional lateral heterostructures consisting of 2D metallic borophene and 1D semiconducting armchair-oriented graphene nanoribbons (aGNRs). The systematic study and refinement of on-surface polymerization process from monomers to organometallic intermediates to demetallization result in borophene/aGNR lateral heterojunctions with structurally and electronically abrupt interfaces, providing insight for precise nanoelectronics.
Article
Chemistry, Multidisciplinary
Natalie Fardian-Melamed, Liat Katrivas, Dvir Rotem, Alexander Kotlyar, Danny Porath
Summary: In recent years, the novel guanine octuplex DNA has attracted much interest as a stable and rigid nanostructure. Electronic structure studies have shown that its lower energy gap results in higher transverse conductivity compared to guanine quadruplex DNA.
Article
Physics, Multidisciplinary
M. Omidian, J. Brand, N. Neel, S. Crampin, J. Kroeger
Summary: Epitaxially grown Fe nanostructures on Pb(111) were studied using low-temperature scanning tunneling microscopy and spectroscopy. The Fe assemblies were categorized into two groups based on their electronic behavior near the Fermi energy. One group exhibited a metallic behavior with a wide energy gap of 0.7 eV that remained temperature-independent. These Fe islands lacked the superconductivity proximity effect in their interior. The other group displayed a metallic behavior at the Fermi level, with the substrate superconducting phase locally entering these islands, evidenced by sharp resonance at the Fermi energy indicating possible Andreev reflection at the magnet-superconductor interface.
NEW JOURNAL OF PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Thais Chagas, Guilherme A. S. Ribeiro, Barbara L. T. Rosa, Danial Bahrami, Arman Davtyan, Rafael R. Barreto, Juan C. Gonzalez, Rogerio Magalhaes-Paniago, Angelo Malachias
Summary: In this study, the researchers investigated the structural and electronic properties of Mg-doped GaAs(111) nanowires, revealing conducting Ga2Mg/Mg clusters on the lateral surfaces, enabling electrical contacts with reduced Schottky barriers. Density functional theory was used to investigate the electronic response of Ga2Mg, showing metallic behavior at room temperature and quantum confinement at low temperatures.
ACS APPLIED NANO MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Zhimin Chai, Anthony Childress, Ahmed A. Busnaina
Summary: Nanofabrication based on directed assembly, utilizing external fields to interact with nanoelements and assemble functional structures, is attracting more interest recently due to its low cost and additive manufacturing advantages. The external fields used in directed assembly include electric, fluidic flow, magnetic, and optical fields.
Article
Chemistry, Physical
Puspitapallab Chaudhuri, Claudio Natalio Lima, H. O. Frota, Angsula Ghosh
Summary: Density functional theory calculations were used to investigate the adsorption of glycine on boron-nitrogen nanotubes, revealing that adsorption through the O-H group is the most stable. Structural parameters, binding energy, charge-density transfer, and other factors were combined to analyze the results.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
George Chimowa, Emmanuel Flahaut, Venkateswara Rao Sodisetti, Somnath Bhattacharyya
Summary: Carbon nanotube (CNT)-based transistors can be converted from ambipolar to unipolar, allowing them to carry large currents for applications requiring high current, such as RF and audio amplifiers.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Haomin Wang, Muqiang Jian, Shuo Li, Xiaoping Liang, Haojie Lu, Kailun Xia, Mengjia Zhu, Yang Wu, Yingying Zhang
Summary: This study investigates the electromechanical response of carbon nanotubes induced by inter-shell sliding. Linear current variation is observed when the shells slide relative to each other. Additionally, a silk-assisted transfer technique is used to fabricate flexible devices based on carbon nanotubes.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xinzuo Sun, Yan Chen, Zhiwei Li, Yu Han, Qin Zhou, Binbin Wang, Takashi Taniguchi, Kenji Watanabe, Aidi Zhao, Jianlu Wang, Yuan Liu, Jiamin Xue
Summary: Researchers successfully visualized the nanometer-scale band profiles of MoS2/WSe2 heterostructure devices using contact-mode scanning tunneling spectroscopy. Due to strong inter- and intralayer charge transfer, the MoS2 layer changes from n-type to p-type, leading to the development of gate-tunable p-n and p-p(+) junctions in the devices. Highly conductive edges were also discovered, which could significantly impact device properties.
Article
Chemistry, Multidisciplinary
Linghao Yan, Orlando J. Silveira, Benjamin Alldritt, Ondrej Krejci, Adam S. Foster, Peter Liljeroth
Summary: The successful fabrication of a 2D monolayer Cu-dicyanoanthracene MOF on an epitaxial graphene surface with long-range order and the study of its structural and electronic properties using low-temperature scanning tunneling microscopy and spectroscopy, along with density-functional theory calculations, show promise for future applications in electronic devices. The ability to access multiple molecular charge states in the 2D MOF using tip-induced local electric fields suggests potential for fabricating and characterizing 2D MOFs with engineered electronic states.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Polymer Science
Vijay Patel, Unnati Joshi, Anand Joshi, Blessing Kudzai Matanda, Kamlesh Chauhan, Ankit D. Oza, Diana-Petronela Burduhos-Nergis, Dumitru-Doru Burduhos-Nergis
Summary: This manuscript presents an experimental investigation of the friction and wear properties of PMMA nanocomposites reinforced with functionalized MWCNTs. The results indicate that the MWCNTs can effectively enhance the tribological performance of PMMA. The optimal MWCNT loading was found to be 0.5 wt.%, resulting in the lowest friction coefficient and wear rate.
Article
Chemistry, Multidisciplinary
Bo Zhu, Yanwei Wu, Zeyi Zhou, Wenjie Zheng, Yuchen Hu, Yongfei Ji, Lingyao Kong, Rui Zhang
Summary: In this work, large electronic tuning on a WSe2 monolayer is achieved by using different facets of a Au-foil substrate, forming in-plane p-n junctions with remarkable built-in electric fields. This facet-dependent tuning effect is directly visualized by scanning tunneling microscopy and differential conductance spectroscopy. The atomic arrangement of the Au facet effectively changes the interfacial coupling and charge transfer, resulting in different magnitudes of charge doping in WSe2.
Article
Physics, Applied
Tae Soo Kim, Taemin Ahn, Tae-Hwan Kim, Hee Cheul Choi, Han Woong Yeom
Summary: Recent research shows that atomic oxygen can oxidize epitaxial graphene in a vacuum without causing damage. In this study, the effects of chemisorbed atomic oxygen on the electronic properties of graphene were investigated using scanning tunneling microscopy (STM). The results reveal that oxygen atoms can modify the electronic states of graphene, creating a bandgap at its Dirac point. Additionally, it was demonstrated that selective desorption or hopping of oxygen atoms can be induced with atomic precision using appropriate bias sweeps with an STM tip. These findings suggest the potential for atomic-scale tailoring of graphene oxide and the development of graphene-based atomic-scale electronic devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Joseph A. Stapleton, Eric M. Hofferber, Jakob Meier, Ivon Acosta Ramirez, Nicole M. Iverson
Summary: This work develops a platform for the immobilization of SWNT sensors with increased fluorescence yield, longevity, fluorescence distribution, and fast reaction times.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shruti Nirantar, Basanagounda Patil, Durgesh C. Tripathi, Nilamani Sethu, Ramakrishnan V. Narayanan, Jie Tian, Madhu Bhaskaran, Sumeet Walia, Sharath Sriram
Summary: Air-channel devices have the advantages of vacuum-like ballistic transport, radiation insensitivity, and nanoscale size. This study investigates the impact of different electrode-pair geometries on the performance of these devices. Experimental results show that modulating the electrode-pair structure can significantly increase the current, while theoretical analysis reveals a direct relationship between the emission current and the active junction area within the metal-air-metal interface. Additionally, the study compares the mechanical stability of different electrode pairs and verifies the results with statistical analysis.
Article
Materials Science, Multidisciplinary
Shigeyuki Umezawa, Takashi Douura, Koji Yoshikawa, Daisuke Tanaka, Vlad Stolojan, S. Ravi P. Silva, Mika Yoneda, Kazuma Gotoh, Yasuhiko Hayashi
Summary: Heat treatment of metal-organic frameworks (MOFs) can produce functional carbons suitable for supercapacitor electrodes. This study investigated the carbonization process of two zinc-based MOFs and found that pore generation is crucial for achieving high capacitance. The findings provide valuable insights for the development of other metal-based MOF-derived multifunctional carbons.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Pengpeng Zhang, Yige Zhao, Yukun Li, Neng Li, S. Ravi P. Silva, Guosheng Shao, Peng Zhang
Summary: The electrocatalysts play an important role in improving the electrochemical performance of lithium-sulfur batteries by selectively accelerating the redox kinetics behavior of Li2S. However, the internal redox reaction routes and active sites in the Li-S battery are difficult to observe directly. This study developed a system that combines the light field and in situ irradiated X-ray photoelectron spectroscopy to convert the black box battery into a see-through battery, allowing for direct observation of charge transportation and revealing the mechanism of Li2S decomposition and nucleation.
Review
Chemistry, Physical
Weiguang Chi, Sanjay K. Banerjee, K. G. D. I. Jayawardena, Sang Il Seok, S. Ravi P. Silva
Summary: In recent years, there has been intensive research on perovskite/silicon tandem solar cells, leading to a rapid increase in their efficiencies. The most suitable subcell for tandem devices is a debatable topic, and this study summarizes three attractive silicon solar cells: passivated-emitter rear-cell (PERC), tunnel oxide passivated contact (TOPCon), and heterojunction (HJT) cells. Their structures and features are elucidated to understand their mechanism and potential for optimum performance. Furthermore, the characteristics and performance of perovskite/silicon tandem cells with these subcells are compared and discussed, with emphasis on the contribution of passivation layer and structure design on both sides. The recombination layer between the two subcells is also analyzed in depth, considering material chemistry, light absorption, and charge transport for achieving an optimized structure.
ACS ENERGY LETTERS
(2023)
Article
Multidisciplinary Sciences
Michal Delkowski, Christopher T. G. Smith, Jose V. Anguita, S. Ravi P. Silva
Summary: Future space travel requires lightweight and robust structural materials that can withstand extreme conditions and multiple entries into orbit. Current inorganic materials cannot meet these requirements. Carbon fiber reinforced polymers (CFRPs), although highly stable, have limitations due to environmental instabilities and electrostatic discharge. To improve space travel and structural engineering, a more robust and improved CFRP is needed. In this study, a superlattice nano-barrier-enhanced CFRP with a density of approximately 3.18 g/cm³ is presented. The composite exhibits enhanced radiation resistance and electrical conductivity, while maintaining ultra-dimensional stability even after temperature cycles.
Article
Materials Science, Multidisciplinary
Raheel Riaz, Bhaskar Dudem, Martina Aurora Costa Angeli, Ali Douaki, Mukhtar Ahmad, Abraham Mejia-Aguilar, Roberto Monsorno, Paolo Lugli, Ravi Silva, Luisa Petti
Summary: A unique ridge-structured device capable of sensing a wide range of forces, from low forces to high forces, is reported. The device is composed of a thermoplastic polyurethane layer sandwiched between two textured silicon elastomeric layers. The optimized device shows a maximum peak output power and current densities of 490 mW m(-2) and 1750 μA m(-2), respectively, at 30 N and 7 Hz of compressive forces. The proposed device exhibits stable electrical output for 10000 cycles and can be used as wearable sensors for monitoring pulse rate, breath patterns, and gait movements.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Energy & Fuels
W. Hashini K. Perera, Mateus G. Masteghin, Hongjae Shim, Joshua D. Davies, Joshua L. Ryan, Steven J. Hinder, Jae S. Yun, Wei Zhang, K. D. G. Imalka Jayawardena, S. Ravi P. Silva
Summary: By using alumina nanoparticles (Al2O3 NPs) to improve the wettability of the perovskite precursor on Me-4PACz, researchers have achieved higher device yield and a champion power conversion efficiency of 19.9%, which is a 20% improvement compared to devices fabricated on PFN-Br-modified Me-4PACz.
Article
Computer Science, Artificial Intelligence
Filip Mandys, Mona Chitnis, S. Ravi P. Silva
Article
Materials Science, Multidisciplinary
Vincenzo Pecunia, S. Ravi P. Silva, Jamie D. Phillips, Elisa Artegiani, Alessandro Romeo, Hongjae Shim, Jongsung Park, Jin Hyeok Kim, Jae Sung Yun, Gregory C. Welch, Bryon W. Larson, Myles Creran, Audrey Laventure, Kezia Sasitharan, Natalie Flores-Diaz, Marina Freitag, Jie Xu, Thomas M. Brown, Benxuan Li, Yiwen Wang, Zhe Li, Bo Hou, Behrang H. Hamadani, Emmanuel Defay, Veronika Kovacova, Sebastjan Glinsek, Sohini Kar-Narayan, Yang Bai, Da Bin Kim, Yong Soo Cho, Agne Zukauskaite, Stephan Barth, Feng Ru Fan, Wenzhuo Wu, Pedro Costa, Javier del Campo, Senentxu Lanceros-Mendez, Hamideh Khanbareh, Zhong Lin Wang, Xiong Pu, Caofeng Pan, Renyun Zhang, Jing Xu, Xun Zhao, Yihao Zhou, Guorui Chen, Trinny Tat, Il Woo Ock, Jun Chen, Sontyana Adonijah Graham, Jae Su Yu, Ling-Zhi Huang, Dan-Dan Li, Ming-Guo Ma, Jikui Luo, Feng Jiang, Pooi See Lee, Bhaskar Dudem, Venkateswaran Vivekananthan, Mercouri G. Kanatzidis, Hongyao Xie, Xiao-Lei Shi, Zhi-Gang Chen, Alexander Riss, Michael Parzer, Fabian Garmroudi, Ernst Bauer, Duncan Zavanelli, Madison K. Brod, Muath Al Malki, G. Jeffrey Snyder, Kirill Kovnir, Susan M. Kauzlarich, Ctirad Uher, Jinle Lan, Yuan-Hua Lin, Luis Fonseca, Alex Morata, Marisol Martin-Gonzalez, Giovanni Pennelli, David Berthebaud, Takao Mori, Robert J. Quinn, Jan-Willem G. Bos, Christophe Candolfi, Patrick Gougeon, Philippe Gall, Bertrand Lenoir, Deepak Venkateshvaran, Bernd Kaestner, Yunshan Zhao, Gang Zhang, Yoshiyuki Nonoguchi, Bob C. Schroeder, Emiliano Bilotti, Akanksha K. Menon, Jeffrey J. Urban, Oliver Fenwick, Ceyla Asker, A. Alec Talin, Thomas D. Anthopoulos, Tommaso Losi, Fabrizio Viola, Mario Caironi, Dimitra G. Georgiadou, Li Ding, Lian-Mao Peng, Zhenxing Wang, Muh-Dey Wei, Renato Negra, Max C. Lemme, Mahmoud Wagih, Steve Beeby, Taofeeq Ibn-Mohammed, K. B. Mustapha, A. P. Joshi
Summary: Ambient energy harvesting has the potential to contribute to sustainable development and power the growth of smart devices in the Internet of Things. Innovative materials are crucial for efficient energy conversion, and this Roadmap provides insights into recent advances and challenges in the field. Promising directions for future research are outlined to fully harness the potential of energy harvesting materials.
JOURNAL OF PHYSICS-MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Shaocong Duan, Qing Sun, Gang Liu, Jianguo Deng, Xiangxin Meng, Bo Shen, Die Hu, Bonan Kang, S. Ravi P. Silva
Summary: Organic-inorganic hybrid perovskite solar cells with high-quality perovskite thin films passivated by an ionic liquid (DADA) exhibit improved device performance, including increased power conversion efficiency and enhanced stability. The DADA treatment reduces surface defects and improves film morphology, leading to reduced charged defects and prolonged carrier lifetime. The increase in work function and passivation of ion defects contribute to better carrier transport.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Ehsan Rezaee, Dimitar I. Kutsarov, Jing Zhang, George Koutsourakis, Bowei Li, Fernando A. Castro, S. Ravi P. Silva
Summary: There is an increasing demand for development of environmentally friendly inks for perovskite-based thin film functional layers. Most perovskite precursors currently used rely on highly toxic solvents, so there is a need for greener inks to facilitate commercialization. Four perovskite precursors were studied, some containing up to 90% ethanol, and high-quality multi-crystalline perovskite layers were successfully fabricated. Large-area photoluminescence imaging was used to improve film quality and enhance deposition uniformity. The development of greener perovskite inks showed great potential, with solar cells fabricated achieving power conversion efficiencies above 19.5%.
Article
Chemistry, Physical
Xiaoyi Hu, Kangli Liu, Shijie Zhang, Guosheng Shao, S. Ravi P. Silva, Peng Zhang
Summary: In this study, a PVDF-HFP/GN GPE with high ionic conductivity, high-temperature resistance, and flame-retardancy was prepared. By regulating the distribution of lithium ions and protecting lithium anodes, the safety and electrochemical performance of lithium metal batteries (LMBs) were improved.
Article
Materials Science, Biomaterials
Swati Panda, Sugato Hajra, Hang Gyeom Kim, Haejin Jeong, P. G. R. Achary, Seonki Hong, Bhaskar Dudem, S. Ravi P. Silva, Venkateswaran Vivekananthan, Hoe Joon Kim
Summary: This article introduces a biodegradable sensor system based on TENG, which can detect biological elements in remote areas. The sensor detects E. coli using a carbohydrate-protein interaction mechanism and monitors the output current to determine the bacterial concentration. The study also tests the degradability and long-term reliability of the sensor. Overall, this article is rated 8 out of 10.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Chemistry, Physical
Shiming Chen, Kai Yang, Hengyao Zhu, Jianan Wang, Yi Gong, Huanxin Li, Manman Wang, Wenguang Zhao, Yuchen Ji, Feng Pan, S. Ravi P. Silva, Yunlong Zhao, Luyi Yang
Summary: This study proposes an efficient catalyst design and synthesis strategy for lithium-CO2 batteries, which converts Pt into 3D porous Pt catalyst with preferred crystal orientation. The catalyst exhibits enhanced CO2 conversion kinetics and superior electrochemical performance. The demonstration of a proof-of-concept stack Li-CO2 pouch cell showcases the potential for large-scale operations.
Article
Materials Science, Multidisciplinary
Guilherme K. Maron, Mateus G. Masteghin, Veridiana Gehrke, Lucas S. Rodrigues, Jose H. Alano, Jessica H. H. Rossato, Valmor Roberto Mastelaro, Jairton Dupont, Marcia Tsuyama Escote, S. Ravi P. Silva, Neftali Lenin Villarreal Carreno
Summary: This study demonstrates an enhanced fabrication technique using CO2 infrared lasers to pattern micro-supercapacitor electrodes. The direct-written laser-induced graphene (LIG) micro-supercapacitors with NiCo2S4 nanoparticles exhibited outstanding properties, including high specific capacitance and energy density, as well as excellent capacitance retention and flexibility. These findings suggest the potential use of LIG/NiCo2S4 MSC in the next generation of flexible and miniaturized portable devices.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Zakaria Saadi, Simon G. King, Jose Anguita, Vlad Stolojan, S. Ravi P. Silva
Summary: Thermoelectric materials offer a promising solution for recovering wasted energy, but their efficiency is low and the best materials are brittle, toxic, and expensive. This study demonstrates that flexible films of double-walled carbon nanotubes can achieve low thermal conductivity and high electrical conductivity, leading to the development of flexible, cheaper, and more efficient thermoelectric generators.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
