Article
Chemistry, Physical
Robert T. Busch, Riccardo Torsi, Angelica Drees, David Moore, Andrew Sarangan, Nicholas R. Glavin, Joshua A. Robinson, Jonathan P. Vernon, W. Joshua Kennedy, Peter R. Stevenson
Summary: The optical behavior of two-dimensional transition metal dichalcogenides (TMDCs) is influenced by thickness and lateral quantum confinement effects. In this study, the optical properties of monolayer metalorganic chemical vapor deposited MoS2 were evaluated using ex situ spectroscopic ellipsometry. The analysis demonstrated the ability to probe the optical exciton behavior of MoS2 at growth-relevant grain sizes and provided insights into the effects of chemical vapor nucleation density, ripening, and lateral growth conditions on the optical properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Robert T. Busch, Riccardo Torsi, Angelica Drees, David Moore, Andrew Sarangan, Nicholas R. Glavin, Joshua A. Robinson, Jonathan P. Vernon, W. Joshua Kennedy, Peter R. Stevenson
Summary: This study evaluates laterally coalescing monolayer MoS2 films using ex situ spectroscopic ellipsometry and demonstrates the ability to probe optical exciton behavior at growth-relevant grain sizes. It provides insights for the in situ epitaxial growth of 2D TMDC films with targeted optical properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Jian Zhang, Yi Zhu, Mike Tebyetekerwa, Delong Li, Dan Liu, Weiwei Lei, Lifeng Wang, Yupeng Zhang, Yuerui Lu
Summary: Substitutional doping of monolayer transition metal dichalcogenides (TMDs) with vanadium has been successfully achieved, resulting in significant enhancement of photoluminescence (PL) intensity and dominance of exciton recombination over trion recombination. Controllable vanadium doping allows for tuning of optical bandgap of MoS2 and threshold voltage of field-effect transistors (FETs). This study demonstrates the potential for applications in optoelectronics by preparing Mo-based monolayer TMDs with controllable vanadium doping.
ACS APPLIED NANO MATERIALS
(2021)
Review
Chemistry, Physical
Zheng Wei, Qinqin Wang, Lu Li, Rong Yang, Guangyu Zhang
Summary: Monolayer MoS(2) as an emerging 2D semiconductor material has various promising applications. Epitaxy is a promising technique for producing high-quality, large-area MoS(2) with controllable properties. Future research will focus on large-scale films with large domain sizes and high domain alignments.
Article
Chemistry, Physical
Jue Wang, Xuan-Hao Cao, Yu-Jia Zeng, Nan-Nan Luo, Li-Ming Tang, Ke-Qiu Chen
Summary: The phonon thermal conductivity of superlattices can be effectively modulated by changing the superlattice arrangement and inducing structural defects, which in turn enhances the thermoelectric performance. The thermoelectric properties of the superlattices increase with temperature and central region length, and the figure of merit can reach 1.38 at 500 K for the aperiodic superlattice. This suggests a new potential strategy for tuning the thermoelectric performance of devices by exploiting the arrangements of aperiodic superlattices.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Condensed Matter
Sanam Saleem, Mudassir Ishfaq, Shatha A. Aldaghfag, Misbah, Muhammad Sajid, Muhammad Yaseen
Summary: The magnetoelectronic and optical characteristics of Ba1-xMoxTiO3 (x = 25%, 50%, and 75%) compound were computed using density functional theory (DFT). It was found that Mo-incorporated BaTiO3 exhibited robust half metallic ferromagnetic properties and showed asymmetric behavior in different spin channels.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Waclaw Kus, Mohammed Javeed Akhter, Tadeusz Burczynski
Summary: This paper explores the design of nanostructures with predefined mechanical properties. The results show that introducing elliptical voids, combined with evolutionary algorithm and molecular dynamics, accurately obtains nanostructures with predefined mechanical material properties.
Article
Chemistry, Multidisciplinary
Ong Kim Le, Viorel Chihaia, Vo Van On, Do Ngoc Son
Summary: This study systematically clarified the effects of F(4)TCNQ, PTCDA, and tetracene adsorption on the electronic and optical properties of monolayer MoS2 using density functional theory calculations. The adsorption of different molecules resulted in MoS2 transforming into p-type or n-type semiconductors, leading to a reduction in bandgap. Additionally, new optical peaks were observed in the MoS2/F(4)TCNQ and MoS2/PTCDA systems at long wavelengths, while the MoS2/tetracene system only modified the optical spectrum in the ultraviolet region. These findings were consistent with experimental results.
Article
Materials Science, Multidisciplinary
Liang-Yan Guo, Sheng-Yuan Xia, Hao Sun, Yunfeng Long, Tianyan Jiang, Zhengyong Huang
Summary: This study used first-principles density functional theory to investigate the adsorption of specific gases on SnO2-MoS2 monolayer. The results show that CH4, C2H2, and NO2 have strong adsorption while other gases have relatively weak adsorption.
Article
Materials Science, Multidisciplinary
Faiha Mujeeb, Poulab Chakrabarti, Vikram Mahamiya, Alok Shukla, Subhabrata Dhar
Summary: Temperature-dependent polarization-resolved photoluminescence spectroscopy is used to investigate the valley depolarization process in 1L-MoS2 samples. It is found that exciton scattering by sulfur vacancies attached with air molecules strongly suppresses valley polarization. The dominant spin-flip process involves long-range electron-hole exchange mediated intervalley transfer of excitons, with momentum scattering by defects playing a central role.
Article
Chemistry, Multidisciplinary
Yin Liu, Sze Cheung Lau, Wen-Hui Cheng, Amalya Johnson, Qitong Li, Emma Simmerman, Ouri Karni, Jack Hu, Fang Liu, Mark L. Brongersma, Tony F. Heinz, Jennifer A. Dionne
Summary: In this study, integration of MoS2 monolayers with a chiral silicon disk array metasurface is used to enhance and control the absorption and emission of excitons in two-dimensional transition metal dichalcogenides. The metasurface coupling enhances the intensity and shortens the lifetime of excitons, trions, and defect bound excitons, and also modifies their spectral shape. Furthermore, the degree of polarization of exciton and trion emission from the valley is symmetrically enhanced at 100 K, resulting from the metasurface-enhanced chiral absorption and the metasurface-enhanced exciton emission from the Purcell effect. The combination of Si-compatible photonic design and large-scale integration of 2D materials in this work is a crucial step towards on-chip valleytronic applications at room temperature.
Article
Materials Science, Multidisciplinary
Teng Cui, Sankha Mukherjee, Momoko Onodera, Guorui Wang, Boran Kumral, Akibul Islam, Moein Shayegannia, Gopi Krishnan, Nima Barri, Peter Serles, Xiang Zhang, Lucas M. Sassi, Jason Tam, Nabil Bassim, Nazir P. Kherani, Pulickel M. Ajayan, Tomoki Machida, Chandra Veer Singh, Yu Sun, Tobin Filleter
Summary: This research evaluates the mechanical reliability of monolayer MoS2 and WSe2 under different loading conditions through experiments and simulations, and finds that their reliability is similar to common engineering ceramics and soda-lime glass. The low reliability is attributed to the synergistic effect of thermal fluctuations, variations in defect configuration, and defect density.
Article
Chemistry, Multidisciplinary
Hao Zhu, Zixuan Chen, Yun Chen, Jun-Jie Zhu
Summary: Quantifying the binding kinetics and affinities of protein-small molecule interactions is critical for biomarker validation, drug discovery, and deep understanding of various biological processes at the molecular-scale. A novel optical imaging platform based on MoS2 material is developed to measure the binding kinetics of protein-small molecules and protein-ions. The method is capable of distinguishing different inhibitors binding to different forms of kinase, and can be used for drug evaluation and mechanism exploration.
Article
Physics, Multidisciplinary
Bei Gao, Can Huang, Feng Zhu, Chun-Lan Ma, Yan Zhu
Summary: Using first-principles method, this study investigates the crystal structure, electronic structure, and magnetic properties of Mn-doped MoS2 monolayer, revealing its half-metallic properties and exploring the coupling mechanism between different spin states.
Article
Physics, Multidisciplinary
Sifan Zhang, Jin Li, Zhentao Fu, Jiao Deng, Guolin Hao, Chaoyu He, Tao Ouyang, Chao Tang, Jianxin Zhong
Summary: This study investigates the effects of co-doping with As-Ge (Si) on the electronic, magnetic, and optical properties of monolayer MoS2 using first-principle calculations. The results demonstrate that the magnetic properties of MoS2 can be effectively tuned by the distance between co-doped atoms, and the interaction and superexchange coupling between As and Ge (Si) atoms play a key role. Furthermore, co-doping induces spin-polarized optical properties in the low-energy region, making co-doped MoS2 a promising candidate for spin-polarized photoelectric device applications.
NEW JOURNAL OF PHYSICS
(2023)
