Article
Chemistry, Multidisciplinary
Changhyeon Yoo, Vivek Adepu, Sang Sub Han, Jung Han Kim, June-Chul Shin, Justin Cao, Junsung Park, Mohammad M. Al Mahfuz, Laurene Tetard, Gwan-Hyoung Lee, Dong-Kyun Ko, Parikshit Sahatiya, Yeonwoong Jung
Summary: In this study, centimeter-scale two-dimensional (2D) SnS layers were successfully grown using chemical vapor deposition (CVD) method at low temperatures. The direct growth of 2D SnS layers on polyamides (PIs) showed intrinsic piezoelectricity, and the centimeter-scale SnS layers/PIs structure allowed for engraving complicated kirigami patterns. The kirigami-patterned 2D SnS layer devices exhibited strain-tolerant piezoelectricity, which was used in detecting human body motions and generating photocurrents.
Article
Nanoscience & Nanotechnology
Wei Cao, Oded Hod, Michael Urbakh
Summary: We have discovered that the complex ferroelectric response of layered materials towards interlayer sliding is determined by the interlayer lattice registry. The entire sliding polarization landscape of two-dimensional layered material interfaces can be described using the polarization registry index (PRI), a simple geometric measure that quantifies the degree of interlayer commensurability. This tool not only aids in understanding the fundamental origin of 2D ferroelectricity, but also allows for efficient characterization and rationalization of existing experimental and computational evidence, as well as prediction of emergent controllable polarization in new noncentrosymmetric layered systems.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Ann Rose Sebastian, Md Golam Kaium, Tae-Jun Ko, Mashiyat Sumaiya Shawkat, Yeonwoong Jung, Ethan C. Ahn
Summary: Transition metal dichalcogenides, particularly heterostructures with platinum dichalcogenides, show great potential as high-sensitivity temperature sensors.
Article
Nanoscience & Nanotechnology
Mashiyat Sumaiya Shawkat, Shihab Bin Hafiz, Molla Manjurul Islam, Sohrab Alex Mofid, Mohammad M. Al Mahfuz, Aritra Biswas, Hee-Suk Chung, Emmanuel Okogbue, Tae-Jun Ko, Debashis Chanda, Tania Roy, Dong-Kyun Ko, Yeonwoong Jung
Summary: There is a growing interest in leveraging 2D van der Waals crystals for IR photodetection due to their unique optoelectrical properties. This study explored the use of wafer-scale 2D platinum ditelluride layers grown directly onto silicon wafers for near-to-mid IR photodetection, demonstrating high photocurrents in the spectral range of 1-7 µm and outperforming stand-alone 2D PtTe2 layers. The observed superiority is attributed to excellent Schottky junction characteristics and optical absorbance competition between 2D PtTe2 layers and Si, with the potential for mechanically flexible IR photodetectors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Qian-Kui Zhang, Wen-Hui Zhao, Zhong-Peng Zhou, Lie-Mao Cao, Wen-Jin Yin, Xiao-Lin Wei, Zhen-Kun Tang, Hui Zhang
Summary: Photoelectric catalytic and solar cells are effective ways to solve global energy shortage and environmental pollution problems. However, low carrier separation efficiency is a common problem in photocatalytic water decomposition and solar cells. In this study, the electronic structures and optical properties of Janus MoSSe/MoGeSiN4 vdW heterostructures were systematically studied, showing promising potential for novel two-dimensional photocatalysis devices and solar cells with high carrier mobility, visible light absorption, and tunable photoelectric properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Huanming Zhang, Min Zhou, Yaqiong Guo, Zhenjiang Yu, Rui Xu, Liaoyong Wen, Yi Wang, Huaping Zhao, Yong Lei
Summary: The gas flow-assisted method (GFAM) enables wrinkle-free transfer of large-area ultrathin membranes onto arbitrary substrates by utilizing contact angle hysteresis to bulge trapped droplets and stretch the membranes. This method offers a simple and durable solution for transferring ultrathin membranes, without altering substrate surface properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Chao Fan, Beibei Dai, Huikang Liang, Xing Xu, Zhuodong Qi, Haotian Jiang, Huigao Duan, Qinglin Zhang
Summary: The study demonstrates the epitaxial growth of 1D CsPbBr3 nanowires on 2D Bi2O2Se nanoplates through a vertical vapor deposition method, forming 2D/1D heterostructures. The photoluminescence results show significant quenching of CsPbBr3 emission in the heterostructure, indicating charge carriers transfer from CsPbBr3 to Bi2O2Se. Waveguide characterization reveals that the epitaxial CsPbBr3 wires can efficiently confine and guide their emission, favoring the light absorption of Bi2O2Se.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Olga Guselnikova, Hyunsoo Lim, Hyun-Jong Kim, Sung Hyun Kim, Alina Gorbunova, Miharu Eguchi, Pavel Postnikov, Takuya Nakanishi, Toru Asahi, Jongbeom Na, Yusuke Yamauchi
Summary: This article reviews recent fabrication methods for surface-enhanced Raman spectroscopy (SERS) substrates, focusing on advanced nanoarchitecture based on noble metals, nanolayered 2D materials, and nanoarchitecturing with organic molecules. The use of SERS has been extensively investigated for its enhanced signal intensity and the ability to detect a very small number of molecules. Nanoarchitecture strategies are crucial in the development of SERS substrates. The article discusses recent achievements in the morphology of metallic nanostructures and outlines future directions for reproducible preparation and well-controlled nanoarchitecture. The use of nanolayered 2D materials as an alternative to noble metals and the hybridization with organic molecules to improve stability and selectivity of SERS sensing are also described.
Article
Nanoscience & Nanotechnology
Xuanling Zhou, Peijian Chen, Rong-Guang Xu, Cun Zhang, Jiazhen Zhang
Summary: This paper investigates the strain engineering modulation of interlayer friction in vdW heterostructures consisting of different materials. A molecular model is established and molecular dynamics simulations are conducted to explore the influence of biaxial and uniaxial strain on interlayer friction. It is found that interlayer friction is insensitive to applied strains, and the robustness of superlubricity is due to the intrinsic characteristics of the structure and the presence of Moire patterns. The introduction of two distinct 2D materials as solid lubricants at the sliding contact interface has potential importance in reducing interfacial friction.
Article
Chemistry, Multidisciplinary
Jihoon Kim, A. Venkatesan, Hanul Kim, Yewon Kim, Dongmok Whang, Gil-Ho Kim
Summary: By manipulating Ohmic contacts in thin-layered dichalcogenides, this study successfully enhances the transport properties of materials and enables practical device applications. The use of WS2 monolayer tunneling barrier effect to reduce Schottky barrier height results in excellent Ohmic properties at room temperature and 100K, with improved SBH and contact resistances. The study demonstrates selective carrier transport across MoTe2 and WS2 layers and excellent gate control over the currents of both channels, with good carrier type modulation by the gate electrode's electric field.
Article
Nanoscience & Nanotechnology
Jorik van de Groep, Qitong Li, Jung-Hwan Song, Pieter G. Kik, Mark L. Brongersma
Summary: Exciton resonances in monolayer transition-metal dichalcogenides (TMDs) exhibit strong light-matter interaction and their line shape can be influenced by the interference of the substrate and TMD reflections. Reflection measurements with index-matching oils allow investigation of the quantum mechanical exciton dynamics. By removing the substrate contribution, the excitonic decay rates can be accurately extracted, providing guidance for engineering exciton line shapes in layered nanophotonic systems.
Article
Materials Science, Multidisciplinary
Dinghua Yang, Xi Zhang, Jiating Lu, Ya Nie, Gang Xiang
Summary: In this study, the structural, electronic, and optical properties of two-dimensional SiGe/SnI2 van der Waals heterostructures in stable configurations were investigated using first-principles calculations. The results showed that the heterostructures exhibited a Dirac cone with a mini-gap, high carrier mobility, and enhanced UV absorption. The Schottky barrier heights between the bilayers could be tuned by strain, making them desirable for Schottky UV photodetectors. Additionally, the band structures and alignments could be tuned by hydrogenation for high-sensitivity UV detection in the infrared background. The SiGe/SnI2 heterostructures with tunable superior electronic and optical properties are valuable for the design, fabrication, and applications of high-performance UV detectors.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Peiyu Qiao, Jing Xia, Xuanze Li, Yuye Li, Jianyu Cao, Zhongshi Zhang, Heng Lu, Qing Meng, Jiangtao Li, Xiang-Min Meng
Summary: In this study, a two-step chemical vapor deposition (CVD) growth method was used to prepare 2D TaSe2-WSe2 metal-semiconductor heterostructures. The results show that these heterostructures can improve the performance of electrical devices and have potential applications in future high-performance integrated circuits.
Article
Optics
Biao Wu, Xing Xie, Haihong Zheng, Shaofei Li, Junnan Ding, Jun He, Zongwen Liu, Yanping Liu
Summary: This study reveals the possibility of introducing artificial anisotropy in symmetric 2D semiconductors through interlayer van der Waals coupling engineering. By analyzing the photoluminescence spectra and Raman spectra, we discovered the anisotropic optical properties of monolayer MoSe2 and provided a conceptual blueprint for designing isotropic and anisotropic heterostructures.
Article
Chemistry, Multidisciplinary
Jing-Yu Mao, Shuang Wu, Guanglong Ding, Zhan-Peng Wang, Fang-Sheng Qian, Jia-Qin Yang, Ye Zhou, Su-Ting Han
Summary: This article reports a damage-free Au/h-BN/Au memristor using a water-assisted metal transfer approach. The device shows improved performance and the ability to perform logic operations.
Article
Materials Science, Multidisciplinary
Tae-Jun Ko, Jae-Hoon Hwang, Dwight Davis, Mashiyat Sumaiya Shawkat, Sang Sub Han, Kelsey L. Rodriguez, Kyu Hwan Oh, Woo Hyoung Lee, Yeonwoong Jung
CURRENT APPLIED PHYSICS
(2020)
Article
Multidisciplinary Sciences
Tae-Jun Ko, Sang Jin Park, Min-Sung Kim, Sun Mi Yoon, Seong Jin Kim, Kyu Hwan Oh, Sahn Nahm, Myoung-Woon Moon
SCIENTIFIC REPORTS
(2020)
Review
Multidisciplinary Sciences
Tae-Jun Ko, Hao Li, Sohrab Alex Mofid, Changhyeon Yoo, Emmanuel Okogbue, Sang Sub Han, Mashiyat Sumaiya Shawkat, Adithi Krishnaprasad, Molla Manjurul Islam, Durjoy Dev, Yongjun Shin, Kyu Hwan Oh, Gwan-Hyoung Lee, Tania Roy, Yeonwoong Jung
Article
Chemistry, Multidisciplinary
Dmitry Kireev, Emmanuel Okogbue, R. T. Jayanth, Tae-Jun Ko, Yeonwoong Jung, Deji Akinwande
Summary: Wearable bioelectronics focusing on the development of advanced person-oriented biomedical devices have garnered immense interest, particularly in utilizing skin-worn smart tattoos for monitoring vital signs. The development of ultrathin platinum-based two-dimensional dichalcogenide electronic tattoos has shown promising results in monitoring human physiological vital signs, potentially leading to advanced human-machine interfaces.
Article
Nanoscience & Nanotechnology
Mashiyat Sumaiya Shawkat, Shihab Bin Hafiz, Molla Manjurul Islam, Sohrab Alex Mofid, Mohammad M. Al Mahfuz, Aritra Biswas, Hee-Suk Chung, Emmanuel Okogbue, Tae-Jun Ko, Debashis Chanda, Tania Roy, Dong-Kyun Ko, Yeonwoong Jung
Summary: There is a growing interest in leveraging 2D van der Waals crystals for IR photodetection due to their unique optoelectrical properties. This study explored the use of wafer-scale 2D platinum ditelluride layers grown directly onto silicon wafers for near-to-mid IR photodetection, demonstrating high photocurrents in the spectral range of 1-7 µm and outperforming stand-alone 2D PtTe2 layers. The observed superiority is attributed to excellent Schottky junction characteristics and optical absorbance competition between 2D PtTe2 layers and Si, with the potential for mechanically flexible IR photodetectors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Tae-Jun Ko, Seohyun Cho, Seong Jin Kim, Young A. Lee, Do Hyun Kim, Wonjin Jo, Ho-Young Kim, Shu Yang, Kyu Hwan Oh, Myoung-Woon Moon
Summary: The study introduces a highly efficient HPOS system for recovering oil-contaminated water, leaving the filtered water with an oil content below 10 ppm, meeting the discharge standard of 15 ppm.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Jinfa Chang, Tae-Jun Ko, Minyeong Je, Hee-Suk Chung, Sang Sub Han, Mashiyat Sumaiya Shawkat, Mengjing Wang, Sang Jin Park, Seung Min Yu, Tae-Sung Bae, Myoung-Woon Moon, Kyu Hwan Oh, Heechae Choi, Yang Yang, Yeonwoong Jung
Summary: The new Pt-based catalyst M-PtTe2, composed of vertically- and horizontally aligned 2D PtTe2 layers, shows significantly improved ORR performance and extremely low alcohol adsorption energies, making it highly suitable for alcohol tolerant DLFCs. This new understanding of the role of 2D layer orientation in ORR kinetics and thermodynamics suggests useful catalyst design principles.
ACS ENERGY LETTERS
(2021)
Review
Medicine, General & Internal
Tae-Jun Ko, Kevin M. Byrd, Shin Ae Kim
Summary: Periodontal diseases are globally prevalent chronic inflammatory conditions caused by microbial dysbiosis and host immune response. Proper diagnosis and treatment are crucial for preventing tooth loss and improving overall quality of life. Collaboration and technology development are needed to enhance rapid diagnosis of periodontal diseases.
Article
Environmental Sciences
Tae-Jun Ko, Shin Ae Kim
Summary: The heating conditions of e-cigarettes can change the physical and chemical properties of aerosols, potentially affecting users' oral and respiratory systems.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Review
Materials Science, Multidisciplinary
Hao Li, Changhyeon Yoo, Tae-Jun Ko, Jung Han Kim, Yeonwoong Jung
Summary: Heterogeneity features in 2D transition metal dichalcogenide materials provide distinctive properties for novel applications, with transmission electron microscopy serving as a valuable tool for directly visualizing atomic defects. This allows for insights into tailoring material properties and future designs of heterostructures and heterointerfaces.
MATERIALS ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Changhyeon Yoo, Tae-Jun Ko, Sang Sub Han, Mashiyat Sumaiya Shawkat, Kyu Hwan Oh, Bo Kyoung Kim, Hee-Suk Chung, Yeonwoong Jung
Summary: This study demonstrates a new type of rollable photodetector based on 2D MoS2 layers, suitable for visible-to-near infrared photodetection with tunable optical bandgaps and superior mechanical deformability. The composite materials in three-dimensionally rollable forms exhibit intriguing photo-responsiveness, significantly broadening the potential and versatility of 2D materials in futuristic devices.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Mashiyat Sumaiya Shawkat, Tanvir Ahmed Chowdhury, Hee-Suk Chung, Shahid Sattar, Tae-Jun Ko, J. Andreas Larsson, Yeonwoong Jung
Article
Chemistry, Physical
Mengjing Wang, Mashiyat Sumaiya Shawkat, Zheng Xi, Xiaohu Xia, Kyu Seung Lee, Dong Ick Son, Tae-Sung Bae, Hyeon Ih Ryu, Hee-Suk Chung, Yeonwoong Jung
JOURNAL OF MATERIALS CHEMISTRY A
(2020)