Article
Multidisciplinary Sciences
Amritanand Sebastian, Rahul Pendurthi, Tanushree H. Choudhury, Joan M. Redwing, Saptarshi Das
Summary: The study benchmarks device-to-device variation in FETs based on MoS2 and WS2, showing consistent performance and record high carrier mobility in WS2 FETs.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Luting Huang, Guofang Fan, Yanan Zhu, Muguang Wang, Xiaoyu Cai, Jiasi Wei, Hongyu Li, Yuan Li
Summary: The study investigates a monolayer WS2 electro-absorption modulator on a GaN waveguide, which achieves a significant change in the effective mode index by altering the refractive index of WS2. The results demonstrate a high modulation bandwidth, modulation depth, and low insertion loss, making it useful for electro-optic modulator research with two-dimensional materials.
Article
Nanoscience & Nanotechnology
Mengke Kang, Changqing Lin, Huan Yang, Yabin Guo, Lixuan Liu, Tianyu Xue, Youwen Liu, Yongji Gong, Zhisheng Zhao, Tianyou Zhai, Kun Zhai, Anmin Nie, Yingchun Cheng, Zhongyuan Liu
Summary: The development of stable and low-cost catalysts to replace Pt-based ones is challenging for hydrogen evolution reaction (HER). Incorporating single foreign Fe atoms to substitute W atoms in sandwiched two-dimensional WS2 has been proposed as a strategy to enhance catalytic reactivity for HER. The charge transfer between the doped Fe atom and neighboring S atoms on the surface activates the proximate S atoms for HER.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Chao Chen, Yang Yang, Xing Zhou, Wenxiong Xu, Qiannan Cui, Jiangbo Lu, Hongmei Jing, Dan Tian, Chunxiang Xu, Tianyou Zhai, Hua Xu
Summary: A novel synthesis strategy combining H-2-triggered chemical vapor deposition with liquid-phase precursor predeposition was reported to precisely synthesize 2D MoS2-WS2 lateral heterojunction nanosheets. The approach allowed for the control of precursor supply and the creation of large-area heterojunctions with uniform domain size, clean surface, high crystallinity, and narrow interface structure, demonstrating significant potential for device applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Zixuan Wang, Wenshuo Xu, Benxuan Li, Qiaoyan Hao, Di Wu, Dianyu Qi, Haibo Gan, Junpeng Xie, Guo Hong, Wenjing Zhang
Summary: This study reports a facile and controllable method for the selective growth of WS2/MoS2 vertical or lateral heterojunctions on metal substrates. By tuning the hydrogen flow rate, the growth mode can be switched, and the coverage of the heterostructures can be adjusted. The research paves the way for the development of two-dimensional heterostructures for applications in (opto)electronic devices.
Article
Nanoscience & Nanotechnology
Xi Wan, Shijia Xu, Mingliang Gao, Tianhao Huang, Yaoyu Duan, Runze Zhan, Kun Chen, Xiaofeng Gu, Weiguang Xie, Jianbin Xu
Summary: This study reports a highly tunable gate junction within monolayer MoS2-WS2 lateral heterostructures synthesized by a new method. The quantitative relationship between gate voltage and built-in potential is revealed, and a trap density mediated mechanism is proposed to explain the highly tunable built-in potential. This research has significant implications for 2D optoelectronic, photodetection, and photovoltaic devices.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Li Zhan, Jun Shen, Jiangbing Yan, Ruiyang Yan, Xiaoxian Zhang, Mingsheng Long, Zheng Liu, Xu Wang, Shaohua Fu, Li Zhang, Hengqing Cui, Xin Zhang
Summary: This study focuses on the controlled synthesis of dendritic WS2/monolayer WS2 heterostructures using atmospheric pressure chemical vapor deposition, with the stacking morphology being verified by various techniques. The research systematically explores the effects of growth times and carrier gas flux on the quasi-epitaxial growth of WS2 films with dendritic structures, and characterizes the compact morphology and differences in contact potential using Kelvin probe force microscopy. Additionally, the fabricated FET devices exhibit excellent electronic properties, paving the way for the rational design of high-sensitivity fractal-enhanced phototransistor devices for industrial and commercial applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Kazi M. Islam, Timothy Ismael, Claire Luthy, Orhan Kizilkaya, Matthew D. Escarra
Summary: In this study, lateral Schottky-junction photovoltaic devices based on monolayer MoS2 were fabricated using chemical vapor deposition (CVD) and characterized. The devices showed repeatable performance under 1 sun illumination and an optoelectronic model was developed to understand loss mechanisms and optimize device designs. A large-area solar cell made with CVD-grown scalable 2D materials was successfully demonstrated.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Isha M. Datye, Alwin Daus, Ryan W. Grady, Kevin Brenner, Sam Vaziri, Eric Pop
Summary: Strain can significantly enhance the electron mobility of two-dimensional semiconductors, which is crucial for applications such as flexible strain sensors.
Article
Nanoscience & Nanotechnology
Alvin Tang, Aravindh Kumar, Marc Jaikissoon, Krishna Saraswat, H-S Philip Wong, Eric Pop
Summary: This study demonstrates the synthesis of continuous monolayer MoS2 films at a relatively low temperature using direct CVD solid-source precursors, achieving high mobility and excellent current characteristics in transistor measurements. This offers a pathway towards high-quality, thermal-budget-compatible 2D semiconductors for heterogeneous integration with silicon manufacturing.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Chieh-Yang Chen, Yiming Li, Min-Hui Chuang
Summary: In this study, we investigate the electronic structures of ternary 2D materials (Mo1-xCrxS2 and W1-xCrxS2) containing transition metal chalcogenides. By controlling the mole fractions of chromium (Cr), the direct band gaps and work functions of these materials can be tuned. The presence of Cr atoms also leads to structural deformation and increased thickness of the monolayer structures.
Article
Physics, Applied
Yishu Wang, Xiaokun Zhai, Liefeng Feng, Tingge Gao
Summary: In this work, the photoluminescence of neutral excitons in WS2 and MoS2 is improved by oleic acid passivation, enabling the observation of trion peaks at room temperature. Additionally, a 3-fold increase in peak intensity and a 107 meV blue-shift in energy peak of interlayer excitons are achieved. This work opens up new possibilities for studying excitons in two-dimensional transition metal dichalcogenide monolayers and heterostructures at room temperature.
APPLIED PHYSICS EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Shiddartha Paul, Riccardo Torsi, Joshua A. Robinson, Kasra Momeni
Summary: Controlling the lattice orientation of two-dimensional materials is a major challenge for their industrial applications. This study investigates the role of substrate crystallinity in the growth orientation of 2D materials and provides insights for the high-quality synthesis of transition metal dichalcogenides (TMDs) for high-performance electronic and optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
V. Kranthi Kumar, Shashwat Rathkanthiwar, Ankit Rao, Priyadarshini Ghosh, Sukanya Dhar, Hareesh Chandrasekar, Tanushree Choudhury, S. A. Shivashankar, Srinivasan Raghavan
Summary: A predictive approach to grain size control from 10 nm to 100 µm in chemical vapor deposited MoS2 monolayers is demonstrated. Physico-chemical modeling is used to correlate the variation in grain size to changes in supersaturation and kinetics on the growth surface. By intentionally adding reaction products to the source chemistry, nucleation density and final grain size are shown to be very sensitive to supersaturation in the initial stage of growth. This study shows that microstructural improvement can enhance field-effect electronic mobility from 0.1 to 17 cm²/V s.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Jintao Yuan, Shangtong Zhou, Bohan Xiao, Lingjie Bao, Zikang Ai, Yuheng Shen, Guang Ran, Qijin Cheng
Summary: In this study, an innovative NaCl-assisted chemical vapor deposition (CVD) method was proposed to synthesize large-area monolayer WS2 nanosheets by adjusting the substrate positions. The HfO2 passivation layer was found to significantly improve the performance of the WS2-based photodetectors, achieving a high responsivity of 1093.1 AW-1, a high specific detectivity of 2.6 x 1012 Jones, and a high external quantum efficiency of 2.1 x 105%. The physical mechanism of the photodetectors with the HfO2 passivation layer was also discussed. This research result can accelerate the development of optoelectronic devices based on TMDCs.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ryan Selhorst, Zhuohang Yu, David Moore, Jie Jiang, Michael A. Susner, Nicholas R. Glavin, Ruth Pachter, Mauricio Terrones, Benji Maruyama, Rahul Rao
Summary: Layered Transition Metal Dichalcogenides (TMDs) are important materials with a diverse range of optoelectronic properties. This study investigates the spatial tailoring of TMDs through electron-beam patterning, achieving high resolution and demonstrating potential for nanoscale functionalization. The modulated properties were found to be dependent on various parameters, and the results were confirmed through spectroscopic analysis and density functional theory modeling. This research provides a robust method for property modulation and functionalization of TMDs at the nanoscale.
Editorial Material
Chemistry, Physical
Nianjun Yang, Mauricio Terrones
Article
Chemistry, Multidisciplinary
Tianyi Zhang, Mingzu Liu, Kazunori Fujisawa, Michael Lucking, Kory Beach, Fu Zhang, Maruda Shanmugasundaram, Andrey Krayev, William Murray, Yu Lei, Zhuohang Yu, David Sanchez, Zhiwen Liu, Humberto Terrones, Ana Laura Elias, Mauricio Terrones
Summary: Controlling the density and spatial distribution of substitutional dopants in semiconductors is essential for achieving desired physicochemical properties. This study demonstrates that edge termination is an important characteristic of 2D transition metal dichalcogenide monocrystals that affects the distribution of substitutional dopants. By utilizing chemical vapor deposition, it is found that sulfur-terminated domains have a higher density of dopants compared to tungsten-terminated domains in monolayer WS2. This edge-dependent dopant distribution can be utilized as a novel technique for engineering the spatial distribution of substitutional dopants in crystalline TMD monolayers.
Article
Chemistry, Multidisciplinary
Min Fu, Wei Chen, Yu Lei, Hao Yu, Yuxiao Lin, Mauricio Terrones
Summary: A general biomimetic mineralization synthetic strategy was proposed to synthesize ferrite quantum dot/graphene heterostructures. The optimized heterostructure exhibited exceptional capacitance and cycling performance, indicating its potential as advanced electrode materials for supercapacitors.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Katherine L. Thompson, Rowan R. Katzbaer, Mauricio Terrones, Raymond E. Schaak
Summary: Ion exchange reactions of colloidal nanoparticles allow for modification of composition while maintaining morphology and crystal structure, which is crucial for tuning properties and producing otherwise inaccessible materials. In this study, tellurium anion exchange of copper selenide nanoparticles was conducted, resulting in the formation of solid solutions with tunable compositions. The post-exchange reactivity of the solid solution nanoparticles, including transformation of composition, surface chemistry, and colloidal dispersibility, was observed due to the apparent metastability of the product.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Jie Fang, Suichu Huang, Kan Yao, Tianyi Zhang, Mauricio Terrones, Wentao Huang, Yunlu Pan, Yuebing Zheng
Summary: Tunable exciton-photon couplings have been demonstrated in monolayer TMDs, showing strong bright-exciton-photon couplings and revealing the novel interactions between bright and dark exciton-photon hybrids in a single optical cavity. The waveguide mode can be tuned in wavelengths by controlling the spacer thickness, and the relative contribution from the antenna mode coupled with dark excitons can be dynamically enlarged by increasing the excitation angle. This study opens new possibilities in tunable QED and provides insights into the coexistence of bright and dark exciton-photon couplings.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Ji-Hoon Park, Ang-Yu Lu, Mohammad Mahdi Tavakoli, Na Yeon Kim, Ming-Hui Chiu, Hongwei Liu, Tianyi Zhang, Zhien Wang, Jiangtao Wang, Luiz Gustavo Pimenta Martins, Zhengtang Luo, Miaofang Chi, Jianwei Miao, Jing Kong
Summary: Wafer-scale monolayer two-dimensional (2D) materials have been achieved through epitaxial chemical vapor deposition (CVD) in recent years. To scale up the synthesis of 2D materials, a comprehensive analysis of the growth dynamics and its dependence on the growth parameters is important. However, most studies on CVD-grown 2D materials have considered each parameter as an independent variable, which is not comprehensive for growth optimization. In this study, monolayer hexagonal boron nitride (hBN) was synthesized on single-crystalline Cu(111) using CVD, and the growth parameters were varied to regulate hBN domain sizes. The correlation between two growth parameters was explored, and a more comprehensive understanding of the growth mechanism for 2D materials was provided through machine learning.
Article
Chemistry, Multidisciplinary
Shuai Fu, Ji-Hoon Park, Hongyan Gao, Tianyi Zhang, Xiang Ji, Tianda Fu, Lu Sun, Jing Kong, Jun Yao
Summary: Research demonstrates the construction of programmable networks using two-terminal MoS2 memristors. These memristors work with a charge-based mechanism similar to transistors, allowing for homogeneous integration with MoS2 transistors to realize one-transistor-one-memristor addressable cells.
Article
Chemistry, Multidisciplinary
Pouria Fattahi, Yin-Ting Yeh, Tiankai Zhao, Mousa Younesi, Changjin Huang, Mauricio Terrones, Siyang Zheng, Justin L. Brown, Dan Dongeun Huh, Sulin Zhang, Peter J. Butler
Summary: Endothelial cells (ECs) exhibit different shapes and mechanical properties depending on the flow in their environment, and these factors affect the uptake of therapeutic nanoparticles (NPs). Cells with elongated shape and higher stiffness show higher uptake of NPs, while those with polygonal shape and lower stiffness show lower uptake. The elongated cells in areas of high laminar shear exhibit less NP uptake compared to nonelongated cells in chaotic, lower shear areas. These findings suggest that manipulating the morphology and mechanical properties of ECs can enhance the uptake of therapeutic NPs for preventing atherosclerosis.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Physical
Shannon McGee, Andres Fest, Cierra Chandler, Nabila N. Nova, Yu Lei, James Goff, Susan B. Sinnott, Ismaila Dabo, Mauricio Terrones, Lauren D. Zarzar
Summary: In this study, we synthesized multimetal catalysts using a laser synthesis method and found that adding a small amount of chromium to the catalyst can enhance the hydrogen evolution efficiency. This research provides new insights for future electrocatalytic design.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jie Fang, Kan Yao, Mingsong Wang, Zhuohang Yu, Tianyi Zhang, Taizhi Jiang, Suichu Huang, Brian A. Korgel, Mauricio Terrones, Andrea Alu, Yuebing Zheng
Summary: In this study, we achieved on-demand exciton-polariton emission from a wide range of TMDs at room temperature by hybridizing excitons with broadband Mie resonances. The system demonstrated stable polaritonic photoluminescence and multiple Rabi splittings.
Article
Multidisciplinary Sciences
Jiaojian Shi, Haowei Xu, Christian Heide, Changan HuangFu, Chenyi Xia, Felipe de Quesada, Hongzhi Shen, Tianyi Zhang, Leo Yu, Amalya Johnson, Fang Liu, Enzheng Shi, Liying Jiao, Tony Heinz, Shambhu Ghimire, Ju Li, Jing Kong, Yunfan Guo, Aaron M. Lindenberg
Summary: The authors report giant room-temperature nonlinearity enhancements in Janus transition metal dichalcogenides, which may be leveraged through electronic band topology. The giant nonlinear optical response is linked to topological band mixing and strong inversion symmetry breaking due to the Janus structure. This work defines general protocols for designing materials with large nonlinearities and heralds the applications of topological materials in optoelectronics.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Gowtham Polumati, Barbara A. Muniz Martinez, Chandra Sekhar Reddy Kolli, Venkatarao Selamneni, Mario Flores Salazar, David Emanuel Sanchez, Andres Fest Carreno, Mauricio Terrones, Andres De Luna Bugallo, Parikshit Sahatiya
Summary: This work demonstrates the band-type engineering and charge transport mechanism of vertically stacked monolayers of MoS2-ReS2 under visible light illumination. The study investigates the impact of stacking order on band alignment and validates the formation of the vertically stacked heterostructure. The results show the significant role of stacking configuration in the optoelectronic properties.
Article
Chemistry, Multidisciplinary
Victor Carozo, Bruno R. Carvalho, Syed Hamza Safeer, Leandro Seixas, Pedro Venezuela, Mauricio Terrones
Summary: We investigated the electronic and phonon properties of few-layered Bi2Te3 systems with different layer thicknesses using Raman spectroscopy and first-principles calculations. The main Raman modes showed frequency dispersion and changes in intensity and lineshape with the variation of layer thickness and excitation energy. Resonant Raman conditions were reached for certain thicknesses due to van Hove singularities at the electronic density of states. Our results demonstrate the significant influence of layer numbers on the Raman scattering mechanics in Bi2Te3 systems.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Tianyi Zhang, Andrew Voshell, Da Zhou, Zachary D. Ward, Zhuohang Yu, Mingzu Liu, Kevin O. Diaz Aponte, Tomotaroh Granzier-Nakajima, Yu Lei, He Liu, Humberto Terrones, Ana Laura Elias, Mukti Rana, Mauricio Terrones
Summary: The ultraflat and dangling bond-free features of 2D transition metal dichalcogenides (TMDs) allow their integration with 3D substrates, forming mixed-dimensional 2D/3D heterostructures. This study investigates the impact of sample preparation conditions and different substrates on the photoluminescence (PL) and other optoelectronic properties of monolayer TMD/Ge heterostructures. The results show that post-transfer low-pressure annealing improves interface quality and homogenizes the PL signal, and the integration of TMD on Ge significantly quenches the PL intensity.