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2D Materials: Phosphorene, Graphene, h-BN, and Many More
2D Materials: Phosphorene, Graphene, h-BN, and Many More
2D materials (graphene, hBN, and others) and their heterostructures have emerged as exciting systems for investigation of novel physical properties and applications in ultrathin electronics. Our focus lies on the hunt for next-generation 2D materials beyond graphene.
2D materials (graphene, hBN, and others) and their heterostructures have emerged as exciting systems for investigation of novel physical properties and applications in ultrathin electronics. Our focus lies on the hunt for next-generation 2D materials beyond graphene.
Synthesis and Material Characterizations of 2D Materials
Structural and Optical Properties of Phosphorene, Graphene, Boron Nitride (BN), and Their Vertical Hetero-Structures
Nanoelectronic Device Fabrication and Measurements
Self-Assembly of Nanoparticles and Molecules on 2D Materials
▶Myeongjin Jang†, Minseol Kim†, Sol Lee, Minseok Kwon, Hani Kang, Kihyun Lee, Jinsub Park, Anh Tuan Hoang, Jong-Hyun Ahn, Yangjin Lee, and Kwanpyo Kim*, "Controlled epitaxy and patterned growth of one-dimensional crystals via surface treatment of two-dimensional templates" npj 2D Mater. Appl. 8, 36 (2024).
▶Hyunmin Cho, Hye-Jin Jin, Sol Lee, Seungbae Jeon, Yongjae Cho, Sam Park, Myeongjin Jang, Livia Janice Widiapradja, Du Yeol Ryu, Ji Hoon Park*, Kwanpyo Kim*, and Seongil Im*, "5 nm ultrathin Crystalline Ferroelectric P(VDF-TrFE)-brush Tuned for Hysteresis-free Sub 60 mV/dec Negative-Capacitance Transistors" Adv. Mater. 35, 2300478 (2023).
▶Tae Keun Yun, Yangjin Lee, Min Je Kim, Jeongwoo Park, Donghee Kang, Seongchan Kim, Young Jin Choi, Yeonjin Yi, Bonggeun Shong, Jeong Ho Cho, and Kwanpyo Kim*, "Commensurate Assembly of C60 on Black Phosphorus for Mixed-dimensional van der Waals Transistors" Small 18, 2105916 (2022).
▶Sol Lee, Joong-Eon Jung, Han-gyu Kim, Yangjin Lee, Je Myoung Park, Jeongsu Jang, Sangho Yoon, Arnab Ghosh, Minseol Kim, Joonho Kim, Woongki Na, Jonghwan Kim, Hyoung Joon Choi, Hyeonsik Cheong, and Kwanpyo Kim*, "γ-GeSe: a New Hexagonal Polymorph from Group IV–VI Monochalcogenides", Nano Lett. 21, 4305-4313 (2021).
▶Yangjin Lee, Jahyun Koo, Sol Lee, Jun-Yeong Yoon, Kangwon Kim, Myeongjin Jang, Jeongsu Jang, Jeongheon Choe, Bao-Wen Li, Chinh Tam Le, Farman Ullah, Yong Soo Kim, Jun Yeon Hwang, Won Chul Lee, Rodney S. Ruoff, Hyeonsik Cheong, Jinwoo Cheon, Hoonkyung Lee*, and Kwanpyo Kim*, "Universal Oriented van der Waals Epitaxy of 1D Cyanide Chains on Hexagonal 2D Crystals", Adv. Sci. 7, 1900757 (2020).
▶ Jeongsu Jang†, Yangjin Lee†, Jun-Yeong Yoon, Hoon Hahn Yoon, Jahyun Koo, Jeongheon Choe, Sungho Jeon, Jongbaek Sung, Jungwon Park, Won Chul Lee, Hoonkyung Lee, Hu Young Jeong, Kibog Park, and Kwanpyo Kim*, "One-Dimensional Assembly on Two-Dimensions: AuCN Nanowire Epitaxy on Graphene for Hybrid Phototransistors", Nano Lett. 18, 6214-6221 (2018).
▶Won Chul Lee†, Kwanpyo Kim†, Jungwon Park†, Jahyun Koo, Hu Young Jeong, Hoonkyung Lee, David A. Weitz, Alex Zettl, and Shoji Takeuchi, "Graphene-templated directional growth of an inorganic nanowire", Nature Nanotechnol. 10, 423-428 (2015).
▶Kwanpyo Kim, Han-Bo-Ram Lee, Richard W. Johnson, Jukka T. Tanskanen, Nan Liu, Myung-Gil Kim, Changhyun Pang, Chiyui Ahn, Stacey F. Bent, and Zhenan Bao, "Selective metal deposition at graphene line defects by atomic layer deposition", Nature Commun. 5, 4781 (2014).
▶Kwanpyo Kim, Sinisa Coh, Liang Z. Tan, William Regan, Jong Min Yuk, Eric Chatterjee, M. F. Crommie, Marvin L. Cohen, S. G. Louie, and A. Zettl, “Raman Spectroscopy Study of Rotated Double-Layer Graphene: Misorientation-Angle Dependence of Electronic Structure”, Phys. Rev. Lett. 108, 246103 (2012).
▶Kwanpyo Kim, Zonghoon Lee, William Regan, C. Kisielowski, M. F. Crommie, and A. Zettl, “Grain Boundary Mapping in Polycrystalline Graphene”, ACS Nano 5, 2142-2146 (2011).
Novel Transmission Electron Microscopy
Novel Transmission Electron Microscopy
Transmission electron microscopy (TEM) allows us to investigate various material properties at atomic resolution. Especially, the developments of various in situ & ex situ measurement systems now can be used to image atomic and nano-scale behaviors of materials under various in situ environments. Various experiments can be performed inside a TEM to directly image dynamical behaviors of material under dc/ac electric fields, mechanical stimulus, and liquid surroundings.
Transmission electron microscopy (TEM) allows us to investigate various material properties at atomic resolution. Especially, the developments of various in situ & ex situ measurement systems now can be used to image atomic and nano-scale behaviors of materials under various in situ environments. Various experiments can be performed inside a TEM to directly image dynamical behaviors of material under dc/ac electric fields, mechanical stimulus, and liquid surroundings.
Atomic Resolution Imaging of 2D Materials
In situ TEM (Nano-Manipulation, Electrical Bias, Liquid and Gas Flow Enviroments)
Graphene Liquid Cell for Imaging Liquid-Phase Reactions
Correlative Measurements Using TEM for Property-Structure Matching
▶Myeongjin Jang, Sol Lee, Fernando Cantos-Prieto, Ivona Košić, Yue Li, Arthur R. C. McCray, Min-Hyoung Jung, Jun-Yeong Yoon, Loukya Boddapati, Francis Leonard Deepak, Hu Young Jeong, Charudatta M. Phatak, Elton J. G. Santos*, Efrén Navarro-Moratalla*, and Kwanpyo Kim*, "Direct observation of twisted stacking domains in the van der Waals magnet CrI3" Nat. Commun. 15, 5925 (2024).
▶Jun-Yeong Yoon, Yangjin Lee, Dong-Gyu Kim, Dong Gun Oh, Jin Kyun Kim, Linshuo Guo, Jungcheol Kim, Jeongheon Choe, Kihyun Lee, Hyeonsik Cheong, Chae Un Kim, Young Jai Choi, Yanhang Ma, and Kwanpyo Kim*, "Type-II Red Phosphorus: Wavy Packing of Twisted Pentagonal Tubes" Angew. Chem. Int. Ed. 62, e202307102 (2023).
▶Kihyun Lee, Jinsub Park, Soyeon Choi, Yangjin Lee, Sol Lee, Joowon Jung, Jong-Young Lee, Farman Ullah, Zeeshan Tahir, Yong Soo Kim, Gwan-Hyoung Lee, and Kwanpyo Kim*, "STEM Image Analysis Based on Deep Learning: Identification of Vacancy Defects and Polymorphs of MoS2", Nano Lett. 22, 4677–4685 (2022).
▶Jeongheon Choe, Yangjin Lee, Jungwon Park, Yunho Kim, Chae Un Kim*, and Kwanpyo Kim*, "Direct imaging of structural disordering and heterogeneous dynamics of fullerene molecular liquid", Nature Commun. 10, 4395 (2019).
▶Jungwon Park, Hans Elmlund, Peter Ercius, Jong Min Yuk, David T. Limmer, Qian Chen, Kwanpyo Kim, Sang Hoon Han, David A. Weitz, A. Zettl, and A. Paul Alivisatos, "3D structure of individual nanocrystals in solution by electron microscopy", Science 349, 290-295 (2015).
▶Jong Min Yuk, Jungwon Park, Peter Ercius, Kwanpyo Kim, Danny J. Hellebusch, M. F. Crommie, Jeong Yong Lee, A. Zettl, and A. Paul Alivisatos, “High-Resolution EM of Colloidal Nanocrystal Growth Using Graphene Liquid Cells”, Science 336, 61-64 (2012).
Nanoelectromechanical Systems (NEMS)
Nanoelectromechanical Systems (NEMS)
Nanoelectromechanical systems utilize the mechanical degree of freedom of nanodevices to investigate mechanical properties of nanomaterials, quantum mechanical behaviors as well as to explore its applications for sensors with ultra-high sensitivity.
Nanoelectromechanical systems utilize the mechanical degree of freedom of nanodevices to investigate mechanical properties of nanomaterials, quantum mechanical behaviors as well as to explore its applications for sensors with ultra-high sensitivity.
Carbon Nanotube and Graphene Mechanical Resonators
Mass Sensing Application of NEMS
Investigation of Electromechanical Properties of 2D Materials
▶Jinsub Park, Yugyeong Je, Joonho Kim, Je Myoung Park, Joong-Eon Jung, Hyeonsik Cheong, Sang Wook Lee*, and Kwanpyo Kim*, "Unveiling the Distinctive Mechanical and Thermal Properties of γ-GeSe" Nano Convergence 11, 29 (2024).
▶Ye-Jin Kim, Yangjin Lee, Kwanpyo Kim, and Oh-Hoon Kwon, "Light-Induced Anisotropic Morphological Dynamics of Black Phosphorus Membranes Visualized by Dark-Field Ultrafast Electron Microscopy", ACS Nano 14, 11383–11393 (2020).
▶Kwanpyo Kim, Vasilii I. Artyukhov, William Regan, Yuanyue Liu, M. F. Crommie, Boris I. Yakobson, and A. Zettl, “Ripping Graphene: Preferred Directions”, Nano Lett. 12, 293-297 (2012).
▶Kwanpyo Kim, K. Jensen, and A. Zettl, “Tuning Nanoelectromechanical Resonators with Mass Migration”, Nano Lett. 9, 3209-3213 (2009).
▶K. Jensen, Kwanpyo Kim, and A. Zettl, “An atomic-resolution nanomechanical mass sensor”, Nature Nanotechnol. 3, 533-537 (2008).
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