Article
Multidisciplinary Sciences
Peifu Cheng, Francesco Fornasiero, Melinda L. Jue, Wonhee Ko, An-Ping Li, Juan Carlos Idrobo, Michael S. H. Boutilier, Piran R. Kidambi
Summary: The mechanisms of water and vapor transport through nanoscale confinements are not fully understood. Significant differences in transport between water vapor and liquid water through nanopores were observed and explained by a flow resistance model. Atomically thin graphene membranes were demonstrated to have high water vapor transport rate and effective blocking of sub-nanometer ions/molecules.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Dongxu Zhang, Zhiqian Jia, Shengping Zhang, Dandan Hou, Jianjun Wang, Ye Liu, Xiao Han, Bart van der Bruggen, Luda Wang
Summary: Inspired by the composite structure of cell membranes and cell walls, a fiber-reinforced large-area atomically thin nanoporous graphene membrane with enhanced mechanical strength and stability is designed, exhibiting superior gas permeance and low water vapor transportation rate.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Pavan Chaturvedi, Nicole K. Moehring, Peifu Cheng, Ivan Vlassiouk, Michael S. H. Boutilier, Piran R. Kidambi
Summary: Selective proton permeation through atomically thin materials like graphene is important for energy conversion/storage and separations. This study investigates the influence of sub-nanometer defects in chemically vapor deposited (CVD) graphene on proton transport and selectivity. The results show that mitigating defects and using interfacial polymerization significantly increase proton conductance and selectivity, making the atomically thin membranes suitable for practical applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Yi-Chao Zou, Lucas Mogg, Nick Clark, Cihan Bacaksiz, Slavisa Milanovic, Vishnu Sreepal, Guang-Ping Hao, Yi-Chi Wang, David G. Hopkinson, Roman Gorbachev, Samuel Shaw, Kostya S. Novoselov, Rahul Raveendran-Nair, Francois M. Peeters, Marcelo Lozada-Hidalgo, Sarah J. Haigh
Summary: This study investigates the dynamics of ion exchange in atomically thin materials, revealing that ion diffusion in few-layer two-dimensional clays approaches that of free water, and superlattice cation islands can form in twisted and restacked materials.
Article
Chemistry, Multidisciplinary
Liming Zheng, Nan Liu, Ying Liu, Ning Li, Jincan Zhang, Chongzhen Wang, Wenqing Zhu, Yanan Chen, Dongchen Ying, Jie Xu, Zi Yang, Xiaoyin Gao, Jilin Tang, Xiaoge Wang, Zibin Liang, Ruqiang Zou, Yuzhang Li, Peng Gao, Xiaoding Wei, Hong-Wei Wang, Hailin Peng
Summary: By developing a bilayer Janus graphene membrane, cryo-EM specimen preparation efficiency and accuracy have been enhanced, enabling high-resolution imaging of biomolecules and materials.
Article
Chemistry, Multidisciplinary
Doojoon Jang, Chirodeep Bakli, Suman Chakraborty, Rohit Karnik
Summary: Atomically thin membranes with nanopores in a 2D material have the potential to outperform polymeric membranes in various applications. A platform technology has been developed to self-assemble oppositely charged polyelectrolytes in larger nanopores, effectively sealing non-selective transport channels while minimizing the impact on smaller, water-selective pores. This enhanced membrane selectivity allows for efficient desalination with high rejection rates of harmful ions.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Ali Sarafraz, Hadi Arjmandi-Tash, Laura Dijkink, Banafsheh Sajadi, Mohsen Moeini, Peter G. Steeneken, Farbod Alijani
Summary: Using molecular dynamics simulations, this study investigates the effect of wrinkles on the nonlinear elasticity of atomically thin graphene membranes, finding that wrinkles formed by uneven stresses lead to a sharp transition, while those formed by crystal defects result in a more gradual transition. A phenomenological model based on experimentally measurable quantities is used to capture these effects, showing that the sharpness of the transition between linear regions in the stress-strain response can be quantified by the model.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Dandan Hou, Shengping Zhang, Xiaobo Chen, Ruiyang Song, Dongxu Zhang, Ayan Yao, Jiayue Sun, Wenxuan Wang, Luzhao Sun, Buhang Chen, Zhongfan Liu, Luda Wang
Summary: This study presents a facile method for fabricating nanoporous atomically thin membranes (NATMs) by directly casting a porous polymer substrate onto graphene. The resulting flexible nanoporous polymer substrate provides sufficient mechanical support without compromising the permeance of the NATMs. The NATMs, with proper pore size and a uniform spongelike structure, demonstrate salt resistance and 3-5 times higher gas permeance than commercial polymeric membranes, bridging the gap between laboratory-scale proof-of-concept and practical applications in the industry.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Roberto Rosati, Koloman Wagner, Samuel Brem, Raul Perea-Causin, Jonas D. Ziegler, Jonas Zipfel, Takashi Taniguchi, Kenji Watanabe, Alexey Chernikov, Ermin Malic
Summary: Through a joint theory-experiment study, it has been discovered that dark excitons play a crucial role in the spatial propagation of excitons in atomically thin materials. The initial population of dark exciton states by emission from bright states leads to rapid expansion of hot excitons and a transient increase in the diffusion coefficient. These findings are significant for both fundamental understanding and technological applications.
Article
Nanoscience & Nanotechnology
Andres Granados del aguila, Yi Ren Wong, Indrajit Wadgaonkar, Antonio Fieramosca, Xue Liu, Kristina Vaklinova, Stefano Dal Forno, T. Thu Ha Do, Ho Yi Wei, Kristina Watanabe, T. Taniguchi, Kostya S. Novoselov, Maciej Koperski, Marco Battiato, Qihua Xiong
Summary: This study presents experimental evidence of a collective state of short-lived excitons in a direct-bandgap, atomically thin MoS2 semiconductor. The propagation of the exciton fluid resembles that of a classical liquid, as indicated by the nearly uniform photoluminescence through the MoS2 monolayer. The exciton fluid flows over ultralong distances at a speed of approximately 6% the speed of light.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Nishel Saini, Kamakshi Pandey, Kamlendra Awasthi
Summary: Conjugate polymers offer the potential to enhance gas separation performance by utilizing the chemical and physical attributes of the polymers. Recent attention has been focused on electroconductive polymeric membranes with enhanced transportation properties and improved selectivity, especially towards polar gases like CO2. The main research direction has been on improving membrane performance through various methods, such as morphology changes and membrane preparation techniques.
MATERIALS TODAY CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Zhong Li, Zhengjun Yao, Azhar Ali Haidry, Yange Luan, Yongli Chen, Bao Yue Zhang, Kai Xu, Ruixiang Deng, Nguyen Duc Hoa, Jintang Zhou, Jian Zhen Ou
Summary: The emerging 2D materials have revolutionized various fields and significantly enhanced the performance of physical and chemical sensors. By artificially stacking individual 2D materials to create atomically thin 2D heterostructures, unique features can be realized, leading to improved sensor capabilities.
Review
Chemistry, Multidisciplinary
Zhe Yuan, Guangwei He, Sylvia Xin Li, Rahul Prasanna Misra, Michael S. Strano, Daniel Blankschtein
Summary: This article discusses recent modeling and experimental advances in nanoporous atomically thin membranes for gas separations. It highlights the advantages and challenges involved, as well as proposes future directions for development.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Gabriel Velarde, Shishir Pandya, J. Karthik, David Pesquera, Lane W. Martin
Summary: This review discusses recent advances in thin-film pyroelectrics, highlighting the complex physical phenomena and history in this field, and emphasizing the importance of controlling thin-film materials. The review also explores recent advancements in thin-film pyroelectric devices and potential future research directions.
Article
Nanoscience & Nanotechnology
Fangze Liu, Lei Guo, Jeffrey DeFazio, Vitaly Pavlenko, Masahiro Yamamoto, Nathan A. Moody, Hisato Yamaguchi
Summary: Photocathodes are essential for photon-to-free-electron conversion, but their lifetime can be limited by reactivity to residual gases and ion back-bombardment. Coating bialkali photocathodes with graphene as a protection layer shows promising results in extending lifetime while maintaining high QE. Experimental results demonstrate high QE on bialkali antimonide grown on a two-layer graphene substrate, with efficient photoelectron transmission through few-layer graphene.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Peifu Cheng, Mattigan M. Kelly, Nicole K. Moehring, Wonhee Ko, An-Ping Li, Juan Carlos Idrobo, Michael S. H. Boutilier, Piran R. Kidambi
Article
Nanoscience & Nanotechnology
Peifu Cheng, Jeremy Espano, Andrew Harkaway, Andrew E. Naclerio, Nicole K. Moehring, Philipp Braeuninger-Weimer, Piran R. Kidambi
Summary: Filtering nanoparticulate aerosols from air streams is crucial for various personal protection equipment (PPE). The existing PPEs are bulky and sacrifice breathability. However, a new study has shown that introducing nanopores into graphene can enable effective filtration of sub-20 nm nanoparticles while maintaining good air permeability. This research has important implications for bio/virus threat mitigation.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Nicole K. Moehring, Pavan Chaturvedi, Peifu Cheng, Wonhee Ko, An-Ping Li, Michael S. H. Boutilier, Piran R. Kidambi
Summary: Introducing angstrom-scale pores into atomically thin 2D materials through chemical vapor deposition enables high flux, proton-selective proton exchange membranes, with in-depth analysis conducted through impedance transport models and stacking methods.
Review
Chemistry, Multidisciplinary
Andrew E. E. Naclerio, Piran R. R. Kidambi
Summary: This article reviews scalable approaches for the synthesis of high-quality mono/multilayer h-BN, discusses the challenges and opportunities for each method, and contextualizes their relevance to emerging applications. Maintaining a stoichiometric balance and layer stacking order are identified as main challenges for h-BN synthesis, and addressing these aspects can guide the synthesis of other layered materials.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Peifu Cheng, Francesco Fornasiero, Melinda L. Jue, Wonhee Ko, An-Ping Li, Juan Carlos Idrobo, Michael S. H. Boutilier, Piran R. Kidambi
Summary: The mechanisms of water and vapor transport through nanoscale confinements are not fully understood. Significant differences in transport between water vapor and liquid water through nanopores were observed and explained by a flow resistance model. Atomically thin graphene membranes were demonstrated to have high water vapor transport rate and effective blocking of sub-nanometer ions/molecules.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Guodong Li, Guanqun Han, Lu Wang, Xiaoyu Cui, Nicole K. Moehring, Piran R. Kidambi, De-en Jiang, Yujie Sun
Summary: This study reports a new method for water electrolysis hydrogen production using a Cu3Ag7 electrocatalyst to replace the sluggish oxygen evolution reaction with the more favorable partial oxidation of formaldehyde to formate under alkaline conditions. The strategy not only produces more valuable anodic product than O-2 but also releases H-2 at the anode with a small voltage input.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Pavan Chaturvedi, Nicole K. Moehring, Thomas Knight, Rahul Shah, Ivan Vlassiouk, Piran R. Kidambi
Summary: Selective proton permeation through atomically thin graphene can be achieved by hot-pressing it with proton conducting polymer (such as Nafion). The quality and defects of graphene transfer are influenced by hot-press time, temperature, and pressure. Sandwich membranes of Nafion|graphene|Nafion, prepared under optimal transfer conditions, show reduced hydrogen crossover and comparable proton area specific resistance, making them suitable for practical PEM applications.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Physical
Pavan Chaturvedi, Nicole K. Moehring, Peifu Cheng, Ivan Vlassiouk, Michael S. H. Boutilier, Piran R. Kidambi
Summary: Selective proton permeation through atomically thin materials like graphene is important for energy conversion/storage and separations. This study investigates the influence of sub-nanometer defects in chemically vapor deposited (CVD) graphene on proton transport and selectivity. The results show that mitigating defects and using interfacial polymerization significantly increase proton conductance and selectivity, making the atomically thin membranes suitable for practical applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Peifu Cheng, Nicole K. Moehring, Juan Carlos Idrobo, Ilia N. Ivanov, Piran R. Kidambi
Summary: Factors influencing graphene NATM fabrication were studied, and a novel hot lamination process was proposed for scalable, facile, and clean transfer. Fully functional graphene NATMs with record high permeances and better selectivity were demonstrated, suitable for practical applications.
Article
Materials Science, Multidisciplinary
N. K. Moehring, M. J. Fort, J. R. McBride, M. Kato, J. E. Macdonald, P. R. Kidambi
MATERIALS TODAY ADVANCES
(2020)
