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Zou Y, Li P, Su C, Yan J, Zhao H, Zhang Z, You Z. Flexible High-Temperature MoS 2 Field-Effect Transistors and Logic Gates. ACS NANO 2024; 18:9627-9635. [PMID: 38489156 DOI: 10.1021/acsnano.3c13220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Abstract
High-temperature-resistant integrated circuits with excellent flexibility, a high integration level (nanoscale transistors), and low power consumption are highly desired in many fields, including aerospace. Compared with conventional SiC high-temperature transistors, transistors based on two-dimensional (2D) MoS2 have advantages of superb flexibility, atomic scale, and ultralow power consumption. However, MoS2 cannot survive at high temperature and drastically degrades above 200 °C. Here, we report MoS2 field-effect transistors (FETs) with top/bottom hexagonal boron nitride (h-BN) encapsulation and graphene electrodes. With the protection of the h-BN/h-BN structure, the devices can survive at much higher temperature (≥500 °C in air) than those of the MoS2 devices ever reported, which provides us an opportunity to explore the electrical properties and working mechanism of MoS2 devices at high temperature. Unlike the relatively low-temperature situation, the on/off ratio and subthreshold swing of MoS2 FETs show drastic variation at elevated temperature due to the injection of thermal emission carriers. Compared with metal electrode, devices with a graphene electrode demonstrate superior performance at high temperature (∼1-order-larger current on/off ratio, 3-7 times smaller subthreshold swing, and 5-9 times smaller threshold voltage shift). We further realize that the flexible CMOS NOT gate based on the above technique, and demonstrate logic computing at 550 °C. This work may stimulate the fundamental research of properties of 2D materials at high temperature, and also creates conditions for next-generation flexible harsh-environment-resistant integrated circuits.
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Affiliation(s)
- Yixuan Zou
- Department of Precision Instruments, Tsinghua University, Beijing 100084, China
| | - Peng Li
- School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Caizhen Su
- Beijing Information Science & Technology University, Beijing 100192, China
| | - Jiawen Yan
- Department of Precision Instruments, Tsinghua University, Beijing 100084, China
| | - Haojie Zhao
- Department of Precision Instruments, Tsinghua University, Beijing 100084, China
| | - Zekun Zhang
- Department of Precision Instruments, Tsinghua University, Beijing 100084, China
| | - Zheng You
- Department of Precision Instruments, Tsinghua University, Beijing 100084, China
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2
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Upadhyay B, Sharma R, Maity D, Narayan TN, Pal SK. Ultrafast carrier dynamics in vanadium-doped MoS 2 alloys. NANOSCALE 2023; 15:16344-16353. [PMID: 37786388 DOI: 10.1039/d3nr03337f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Substitutional doping is a most promising approach to manipulate the electronic and optical properties of two-dimensional (2D) transition metal dichalcogenides (TMDCs). In addition to inducing magnetism, vanadium (V) doping can lead to semiconductor-metal transition in TMDCs. However, the dynamics of charge carriers that governs the optoelectronic properties of doped TMDCs has been rarely revealed. In this work, we have investigated the dynamics of photocarriers in pristine and V-doped monolayer (ML) MoS2. Comparison of the transient absorption (TA) spectra of ML MoS2 with lightly (≤1%) and heavily (3.62%) V-doped MoS2 infers the induction of additional energy states in the doped materials giving rise to new low energy bleach features in the TA spectra. The quasiparticle band structure of MoS2 is found to disappear at sufficiently high V doping due to the presence of impurity bands. An attempt has also been made to study the manipulation of the carrier lifetime with V doping in MoS2. Our TA kinetic measurements suggest that the decay kinetics of the carriers becomes slower with increasing doping percentage and at a higher doping level the carriers survive for a much longer time compared to pristine MoS2. Furthermore, we have identified a new electronic transition (NET) in heavily V-doped MoS2 at high pump fluences.
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Affiliation(s)
- Bhuvan Upadhyay
- School of Physical Sciences, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India.
- Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Rahul Sharma
- Tata Institute of Fundamental Research-Hyderabad, Sy. No. 36/P, Gopanapally Village, Serilingampally Mandal, Hyderabad-500046, India
- Department of Physics and Astronomy, Uppsala University, 75236, Uppsala, Sweden
| | - Dipak Maity
- Tata Institute of Fundamental Research-Hyderabad, Sy. No. 36/P, Gopanapally Village, Serilingampally Mandal, Hyderabad-500046, India
| | - Tharangattu N Narayan
- Tata Institute of Fundamental Research-Hyderabad, Sy. No. 36/P, Gopanapally Village, Serilingampally Mandal, Hyderabad-500046, India
| | - Suman Kalyan Pal
- School of Physical Sciences, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India.
- Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
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3
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Wang X, Zhao X, Guo S, Weller D, Quan S, Wu M, Liu W, Liu R. Visualized and Nondestructive Quality Identification of Two-Dimensional MoS 2 Based on Principal Component Analysis. J Phys Chem Lett 2023; 14:8088-8094. [PMID: 37656910 DOI: 10.1021/acs.jpclett.3c02093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/03/2023]
Abstract
To date, the common quality characterizations for MoS2 are inefficient or cause irreversible damage to the samples, which have limited scalability and low throughput. Here, we propose a visualized and nondestructive approach to evaluate the quality of MoS2 based on the PCA machine learning method. Through PCA processing of PL mapping, the CVD grown MoS2 with different edge defect densities can be well distinguished. Furthermore, six twin GBs along the sulfur zigzag direction of the six pointed MoS2 stars are also successfully identified. To verify the correctness of the identification results, we measured the lifetime mapping and thermal expansion coefficient of the synthesized MoS2 samples. It is found that the high quality MoS2 samples have a shorter carrier lifetime (∼0.291 ns) and lower thermal expansion coefficient (∼2.03 × 10-5K-1). Therefore, our work offers a new approach to evaluate the quality of MoS2 to drive their practical application.
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Affiliation(s)
- Xuefeng Wang
- School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China
| | - Xiaoyu Zhao
- School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China
| | - Shuai Guo
- School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China
| | - Dieter Weller
- Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg 47057, Germany
| | - Sufeng Quan
- School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China
| | - Mengxuan Wu
- School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China
| | - Wenjun Liu
- School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China
| | - Ruibin Liu
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, P. R. China
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4
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Jiang Y, Liu Z, Zhou H, Sharma A, Deng J, Ke C. Physical adsorption and oxidation of ultra-thin MoS 2crystals: insights into surface engineering for 2D electronics and beyond. NANOTECHNOLOGY 2023; 34:405701. [PMID: 37462320 DOI: 10.1088/1361-6528/ace1f7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/26/2023] [Indexed: 01/25/2024]
Abstract
The oxidation mechanism of atomically thin molybdenum disulfide (MoS2) plays a critical role in its nanoelectronics, optoelectronics, and catalytic applications, where devices often operate in an elevated thermal environment. In this study, we systematically investigate the oxidation of mono- and few-layer MoS2flakes in the air at temperatures ranging from 23 °C to 525 °C and relative humidities of 10%-60% by using atomic force microscopy (AFM), Raman spectroscopy and x-ray photoelectron spectroscopy. Our study reveals the formation of a uniform nanometer-thick physical adsorption layer on the surface of MoS2, which is attributed to the adsorption of ambient moisture. This physical adsorption layer acts as a thermal shield of the underlying MoS2lattice to enhance its thermal stability and can be effectively removed by an AFM tip scanning in contact mode or annealing at 400 °C. Our study shows that high-temperature thermal annealing and AFM tip-based cleaning result in chemical adsorption on sulfur vacancies in MoS2, leading to p-type doping. Our study highlights the importance of humidity control in ensuring reliable and optimal performance for MoS2-based electronic and electrochemical devices and provides crucial insights into the surface engineering of MoS2, which are relevant to the study of other two-dimensional transition metal dichalcogenide materials and their applications.
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Affiliation(s)
- Yingchun Jiang
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Zihan Liu
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Huimin Zhou
- Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Anju Sharma
- Small Scale Systems Integration and Packaging Center, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Jia Deng
- Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Changhong Ke
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
- Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
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5
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Zhang Q, Liu Y, Ding M, Yuwen L, Wang L. On-Demand Free Radical Release by Laser Irradiation for Photothermal-Thermodynamic Biofilm Inactivation and Tooth Whitening. Gels 2023; 9:554. [PMID: 37504433 PMCID: PMC10379348 DOI: 10.3390/gels9070554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 06/27/2023] [Accepted: 07/04/2023] [Indexed: 07/29/2023] Open
Abstract
Dental diseases associated with biofilm infections and tooth staining affect billions of people worldwide. In this study, we combine photothermal agents (MoS2@BSA nanosheets, MB NSs), a thermolysis free-radical initiator (AIPH), and carbomer gel to develop laser-responsive hydrogel (MBA-CB Gel) for biofilm inactivating and tooth whitening. Under a physiological temperature without laser irradiation, MB NSs can eliminate free radicals generated from the slow decomposition of AIPH due to their antioxidative activity, thereby avoiding potential side effects. A cytotoxicity study indicates that MB NSs can protect mammalian cells from the free radicals released from AIPH without laser irradiation. Upon exposure to laser irradiation, MB NSs promote the rapid decomposition of AIPH to release free radicals by photothermal effect, suggesting their on-demand release ability of free radicals. In vitro experimental results show that the bacteria inactivation efficiency is 99.91% (3.01 log units) for planktonic Streptococcus mutans (S. mutans) and 99.98% (3.83 log units) for planktonic methicillin-resistant Staphylococcus aureus (MRSA) by the mixed solution of MB NSs and AIPH (MBA solution) under 808 nm laser irradiation (1.0 W/cm2, 5 min). For S. mutans biofilms, an MBA solution can inactivate 99.97% (3.63 log units) of the bacteria under similar laser irradiation conditions. Moreover, MBA-CB Gel can whiten an indigo carmine-stained tooth under laser irradiation after 60 min of laser treatment, and the color difference (ΔE) in the teeth of the MBA-CB Gel treatment group was 10.9 times that of the control group. This study demonstrates the potential of MBA-CB Gel as a promising platform for biofilm inactivation and tooth whitening. It is worth noting that, since this study only used stained models of extracted teeth, the research results may not fully reflect the actual clinic situation. Future clinical research needs to further validate these findings.
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Affiliation(s)
- Qi Zhang
- State Key Laboratory of Organic Electronics and Information Displays, Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
| | - Yuan Liu
- State Key Laboratory of Organic Electronics and Information Displays, Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
| | - Meng Ding
- Nanjing Stomatological Hospital, Medicine School, Nanjing University, Nanjing 210008, China
| | - Lihui Yuwen
- State Key Laboratory of Organic Electronics and Information Displays, Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
| | - Lianhui Wang
- State Key Laboratory of Organic Electronics and Information Displays, Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
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6
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Mao Q, Zhang Y, Kowalik M, Nayir N, Chandross M, van Duin ACT. Oxidation and hydrogenation of monolayer MoS2 with compositing agent under environmental exposure: The ReaxFF Mo/Ti/Au/O/S/H force field development and applications. FRONTIERS IN NANOTECHNOLOGY 2022. [DOI: 10.3389/fnano.2022.1034795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
An atomistic modeling tool is essential to an in-depth understanding upon surface reactions of transition metal dichalcogenides (TMDs), such as molybdenum disulfide (MoS2), with the presence of compositing agents, including Ti and Au, under different environmental exposures. We report a new ReaxFF reactive force field parameter set for Mo, Ti, Au, O, S, and H interactions. We apply the force field in a series of molecular dynamics (MD) simulations to unravel the impact of the Ti dopant on the oxidation/hydrogenation behaviors of MoS2 surface. The simulation results reveal that, in the absence of Ti clusters, the MoS2 surface is ruptured and oxidized at elevated temperatures through a process of adsorption followed by dissociation of the O2 molecules on the MoS2 surface during the temperature ramp. When the MoS2 surface is exposed to H2O molecules, surface hydrogenation is most favored, followed by oxidation, then hydroxylation. The introduction of Ti clusters to the systems mitigates the oxidation/hydrogenation of MoS2 at a low or intermediate temperature by capturing the O2/H2O molecules and locking the O/H-related radicals inside the clusters. However, OH− and H3O+ are emitted from the Ti clusters in the H2O environment as temperature rises, and the accelerating hydrogenation of MoS2 is consequently observed at an ultra-high temperature. These findings indicate an important but complex role of Ti dopants in mitigating the oxidation and hydrogenation of MoS2 under different environmental exposures. The possible mechanisms of oxidation and hydrogenation revealed by MD simulations can give an insight to the design of oxidation resistant TMDs and can be useful to the optical, electronic, magnetic, catalytic, and energy harvesting industries.
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7
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Sovizi S, Tosoni S, Szoszkiewicz R. MoS 2 oxidative etching caught in the act: formation of single (MoO 3) n molecules. NANOSCALE ADVANCES 2022; 4:4517-4525. [PMID: 36341303 PMCID: PMC9595104 DOI: 10.1039/d2na00374k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 08/27/2022] [Indexed: 06/16/2023]
Abstract
We report the presence of sub-nm MoO x clusters formed on basal planes of the 2H MoS2 crystals during thermal oxidative etching in air at a temperature of 370 °C. Using high resolution non-contact atomic force microscopy (AFM) we provide a histogram of their preferred heights. The AFM results combined with density functional theory (DFT) simulations show remarkably well that the MoO x clusters are predominantly single MoO3 molecules and their dimers at the sulfur vacancies. Additional Raman spectroscopy, and energy and wavelength dispersive X-ray spectroscopies as well as Kelvin probe AFM investigations confirmed the presence of the MoO3/MoO x species covering the MoS2 surface only sparsely. The X-ray absorption near edge spectroscopy data confirm the MoO3 stoichiometry. Taken together, our results show that oxidative etching and removal of Mo atoms at the atomic level follow predominantly via formation of single MoO3 molecules. Such findings confirm the previously only proposed oxidative etching stoichiometry.
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Affiliation(s)
- Saeed Sovizi
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw Żwirki I Wigury 101 02-089 Warsaw Poland
| | - Sergio Tosoni
- Dipartimento di Scienza dei materiali, Università di Milano-Bicocca via Roberto Cozzi 55 20125 Milan Italy
| | - Robert Szoszkiewicz
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw Żwirki I Wigury 101 02-089 Warsaw Poland
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8
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Liu QY, Sun GW, Pan JL, Wang SK, Zhang CY, Wang YC, Gao XP, Sun GZ, Zhang ZX, Pan XJ, Zhou JY. Metal Ion Cutting-Assisted Synthesis of Defect-Rich MoS 2 Nanosheets for High-Rate and Ultrastable Li 2S Catalytic Deposition. ACS APPLIED MATERIALS & INTERFACES 2022; 14:37771-37781. [PMID: 35960183 DOI: 10.1021/acsami.2c09176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Active metal ions often show a strong cutting effect on the chemical bonds during high-temperature thermal processes. Herein, a one-pot metal ion cutting-assisted method was adopted to design defect-rich MoS2-x nanosheet (NS)/ZnS nanoparticle (NP) heterojunction composites on carbon nanofiber skeletons (CNF@MoS2-x/ZnS) via a simple Ar-ambience annealing. Results show that Zn2+ ions capture S2- ions from MoS2 and form into ZnS NPs, and the MoS2 NSs lose S2- ions and become MoS2-x ones. As sulfur hosts for lithium-sulfur batteries (LSBs), the CNF@MoS2-x/ZnS-S cathodes deliver a high reversible capacity of 1233 mA h g-1 at 0.1 C and keep 944 mA h g-1 at 3 C. Moreover, the cathodes also show an extremely low decay rate of 0.012% for 900 cycles at 2 C. Series of analysis indicate that the MoS2-x NSs significantly improve the chemisorption and catalyze the kinetic process of redox reactions of lithium polysulfides, and the heterojunctions between MoS2-x NSs and ZnS NPs further accelerate the transport of electrons and the diffusion of Li+ ions. Besides, the CNF@MoS2-x/ZnS-S LSBs also show an ultralow self-discharge rate of 1.1% in voltage. This research would give some new insights for the design of defect-rich electrode materials for high-performance energy storage devices.
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Affiliation(s)
- Qian Yu Liu
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Guo Wen Sun
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Jiang Long Pan
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Shi Kun Wang
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Chao Yue Zhang
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Yan Chun Wang
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
- Academy of Plateau Science and Sustainability & School of Physics and Electronic Information Engineering, Qinghai Normal University, 38 Haihu Avenue Extension Section, Xining 810008, China
| | - Xiu Ping Gao
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Geng Zhi Sun
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China
| | - Zhen Xing Zhang
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Xiao Jun Pan
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
| | - Jin Yuan Zhou
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science & Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China
- Academy of Plateau Science and Sustainability & School of Physics and Electronic Information Engineering, Qinghai Normal University, 38 Haihu Avenue Extension Section, Xining 810008, China
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9
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High-temperature flexible WSe 2 photodetectors with ultrahigh photoresponsivity. Nat Commun 2022; 13:4372. [PMID: 35902553 PMCID: PMC9334605 DOI: 10.1038/s41467-022-32062-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 07/13/2022] [Indexed: 11/10/2022] Open
Abstract
The development of high-temperature photodetectors can be beneficial for numerous applications, such as aerospace engineering, military defence and harsh-environments robotics. However, current high-temperature photodetectors are characterized by low photoresponsivity (<10 A/W) due to the poor optical sensitivity of commonly used heat-resistant materials. Here, we report the realization of h-BN-encapsulated graphite/WSe2 photodetectors which can endure temperatures up to 700 °C in air (1000 °C in vacuum) and exhibit unconventional negative photoconductivity (NPC) at high temperatures. Operated in NPC mode, the devices show a photoresponsivity up to 2.2 × 106 A/W, which is ~5 orders of magnitude higher than that of state-of-the-art high-temperature photodetectors. Furthermore, our devices demonstrate good flexibility, making it highly adaptive to various shaped surfaces. Our approach can be extended to other 2D materials and may stimulate further developments of 2D optoelectronic devices operating in harsh environments. High-temperature photodetectors are desired for aerospace applications and harsh-environment robotics, but their responsivity is usually limited. Here, the authors report flexible hBN-encapsulated graphite/WSe2 photodetectors which can endure temperatures up to 700 °C in air with enhanced photoresponsivity.
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Mobtakeri S, Habashyani S, Gür E. Highly Responsive Pd-Decorated MoO 3 Nanowall H 2 Gas Sensors Obtained from In-Situ-Controlled Thermal Oxidation of Sputtered MoS 2 Films. ACS APPLIED MATERIALS & INTERFACES 2022; 14:25741-25752. [PMID: 35608898 PMCID: PMC9185678 DOI: 10.1021/acsami.2c04804] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
Among transition metal oxides, MoO3 is a promising material due to its layered structure and different oxidation states, making it suitable for different device applications. One of the methods used to grow MoO3 is radio frequency magnetron sputtering (RFMS), which is the most compatible method in industry. However, obtaining nanostructures by RFMS for metal oxides is challenging because of compact morphology film formation. In this study, α-MoO3 with vertical nanowalls is obtained by a two-step process; deposition of magnetron-sputtered MoS2 vertical nanowalls and postoxidation of these structures without changing the morphology. In situ transmittance and electrical measurements are performed to control the oxidation process, which shed light on understanding the oxidation of MoS2 nanowalls. The transition from MoS2 to α-MoO3 is investigated with partially oxidized MoS2/MoO3 samples with different thicknesses. It is also concluded that oxidation starts from nanowalls perpendicular to the substrate and lasts with oxidation of basal planes. Four different thicknesses of α-MoO3 nanowall samples are fabricated for H2 gas sensors. Also, the effect of Pd deposition on the H2-sensing properties of sensors is deeply investigated. An outstanding response of 3.3 × 105 as well as the response and recovery times of 379 and 304 s, respectively, are achieved from the thinnest Pd-loaded sample. Also, the gas-sensing mechanism is explored by gasochromic measurements to investigate the sensor behaviors under the conditions of dry air and N2 gas as the carrier gas.
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Affiliation(s)
- Soheil Mobtakeri
- Department
of Nanoscience and Nanoengineering, Graduate School of Natural and
Applied Science, Atatürk University, Erzurum 25240, Turkey
| | - Saman Habashyani
- Department
of Nanoscience and Nanoengineering, Graduate School of Natural and
Applied Science, Atatürk University, Erzurum 25240, Turkey
| | - Emre Gür
- Department
of Nanoscience and Nanoengineering, Graduate School of Natural and
Applied Science, Atatürk University, Erzurum 25240, Turkey
- Department
of Physics, Faculty of Science, Ataturk
University, Erzurum 25250, Turkey
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11
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Garcia-Esparza AT, Park S, Abroshan H, Paredes Mellone OA, Vinson J, Abraham B, Kim TR, Nordlund D, Gallo A, Alonso-Mori R, Zheng X, Sokaras D. Local Structure of Sulfur Vacancies on the Basal Plane of Monolayer MoS 2. ACS NANO 2022; 16:6725-6733. [PMID: 35380038 DOI: 10.1021/acsnano.2c01388] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The nature of the S-vacancy is central to controlling the electronic properties of monolayer MoS2. Understanding the geometric and electronic structures of the S-vacancy on the basal plane of monolayer MoS2 remains elusive. Here, operando S K-edge X-ray absorption spectroscopy shows the formation of clustered S-vacancies on the basal plane of monolayer MoS2 under reaction conditions (H2 atmosphere, 100-600 °C). First-principles calculations predict spectral fingerprints consistent with the experimental results. The Mo K-edge extended X-ray absorption fine structure shows the local structure as coordinatively unsaturated Mo with 4.1 ± 0.4 S atoms as nearest neighbors (above 400 °C in an H2 atmosphere). Conversely, the 6-fold Mo-Mo coordination in the crystal remains unchanged. Electrochemistry confirms similar active sites for hydrogen evolution. The identity of the S-vacancy defect on the basal plane of monolayer MoS2 is herein elucidated for applications in optoelectronics and catalysis.
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Affiliation(s)
- Angel T Garcia-Esparza
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
| | - Sangwook Park
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
| | - Hadi Abroshan
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Oscar A Paredes Mellone
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - John Vinson
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Baxter Abraham
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Taeho R Kim
- Stanford Nano Shared Facilities, Stanford University, Stanford, California 94305, United States
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Alessandro Gallo
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Roberto Alonso-Mori
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Xiaolin Zheng
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
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12
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Alam MH, Chowdhury S, Roy A, Wu X, Ge R, Rodder MA, Chen J, Lu Y, Stern C, Houben L, Chrostowski R, Burlison SR, Yang SJ, Serna MI, Dodabalapur A, Mangolini F, Naveh D, Lee JC, Banerjee SK, Warner JH, Akinwande D. Wafer-Scalable Single-Layer Amorphous Molybdenum Trioxide. ACS NANO 2022; 16:3756-3767. [PMID: 35188367 DOI: 10.1021/acsnano.1c07705] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Molybdenum trioxide (MoO3), an important transition metal oxide (TMO), has been extensively investigated over the past few decades due to its potential in existing and emerging technologies, including catalysis, energy and data storage, electrochromic devices, and sensors. Recently, the growing interest in two-dimensional (2D) materials, often rich in interesting properties and functionalities compared to their bulk counterparts, has led to the investigation of 2D MoO3. However, the realization of large-area true 2D (single to few atom layers thick) MoO3 is yet to be achieved. Here, we demonstrate a facile route to obtain wafer-scale monolayer amorphous MoO3 using 2D MoS2 as a starting material, followed by UV-ozone oxidation at a substrate temperature as low as 120 °C. This simple yet effective process yields smooth, continuous, uniform, and stable monolayer oxide with wafer-scale homogeneity, as confirmed by several characterization techniques, including atomic force microscopy, numerous spectroscopy methods, and scanning transmission electron microscopy. Furthermore, using the subnanometer MoO3 as the active layer sandwiched between two metal electrodes, we demonstrate the thinnest oxide-based nonvolatile resistive switching memory with a low voltage operation and a high ON/OFF ratio. These results (potentially extendable to other TMOs) will enable further exploration of subnanometer stoichiometric MoO3, extending the frontiers of ultrathin flexible oxide materials and devices.
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Affiliation(s)
- Md Hasibul Alam
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Sayema Chowdhury
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Anupam Roy
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Xiaohan Wu
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Ruijing Ge
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Michael A Rodder
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Jun Chen
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
| | - Yang Lu
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
| | - Chen Stern
- Faculty of Engineering, Bar-Ilan University, IL 52900, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, IL 5290002, Israel
| | - Lothar Houben
- Chemical Research Support, Weizmann Institute of Science, Rehovot, IL 76100, Israel
| | - Robert Chrostowski
- Texas Material Institute, The University of Texas at Austin, Austin, Texas 78712, United States
- Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Scott R Burlison
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Sung Jin Yang
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Martha I Serna
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Ananth Dodabalapur
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Filippo Mangolini
- Texas Material Institute, The University of Texas at Austin, Austin, Texas 78712, United States
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Doron Naveh
- Faculty of Engineering, Bar-Ilan University, IL 52900, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, IL 5290002, Israel
| | - Jack C Lee
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Sanjay K Banerjee
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
| | - Jamie H Warner
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
- Texas Material Institute, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Deji Akinwande
- Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, United States
- Texas Material Institute, The University of Texas at Austin, Austin, Texas 78712, United States
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13
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Yu F, Jing X, Wang Y, Sun M, Duan C. Hierarchically Porous Metal–Organic Framework/MoS
2
Interface for Selective Photocatalytic Conversion of CO
2
with H
2
O into CH
3
COOH. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108892] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Fengyang Yu
- Zhang Dayu College of Chemistry State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 China
| | - Xu Jing
- Zhang Dayu College of Chemistry State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 China
| | - Yao Wang
- Zhang Dayu College of Chemistry State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 China
| | - Mingyang Sun
- Zhang Dayu College of Chemistry State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 China
| | - Chunying Duan
- Zhang Dayu College of Chemistry State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 China
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14
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Yu F, Jing X, Wang Y, Sun M, Duan C. Hierarchically Porous Metal-Organic Framework/MoS 2 Interface for Selective Photocatalytic Conversion of CO 2 with H 2 O into CH 3 COOH. Angew Chem Int Ed Engl 2021; 60:24849-24853. [PMID: 34435428 DOI: 10.1002/anie.202108892] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Indexed: 12/13/2022]
Abstract
Metal-organic frameworks (MOFs) provide a platform to design new heterogeneous catalysts for catalytic CO2 reduction, but selective formation of C2 valuable liquid fuel products remains a challenge. Herein, we propose a strategy to synthesize composites by integrating MoS2 nanosheets into hierarchically porous defective UiO-66 (d-UiO-66) to form Mo-O-Zr bimetallic sites on the interfaces between UiO-66 and MoS2 . The active interfaces are favorable for the efficient transfer of photo-generated charge carriers and for promoting the activity, whereas, the synergy of the components at the interfaces achieves selectivity for C2 production. The d-UiO-66/MoS2 composite facilitates the photo-catalytic conversion of gas phase CO2 and H2 O to CH3 COOH under visible light irradiation without any other adducts. The evolution rate and selectivity of CH3 COOH reached 39.0 μmol g-1 h-1 and 94 %, respectively, without any C1 products, suggesting a new approach for the design of highly efficient photocatalysts of CO2 for C2 production. Theoretical calculations demonstrate the charge-polarized Zr-O-Mo aided the C-C coupling process with the largely reduced energy barrier.
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Affiliation(s)
- Fengyang Yu
- Zhang Dayu College of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Xu Jing
- Zhang Dayu College of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Yao Wang
- Zhang Dayu College of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Mingyang Sun
- Zhang Dayu College of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
| | - Chunying Duan
- Zhang Dayu College of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China
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15
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Szoszkiewicz R. Local Interactions of Atmospheric Oxygen with MoS 2 Crystals. MATERIALS (BASEL, SWITZERLAND) 2021; 14:5979. [PMID: 34683567 PMCID: PMC8540515 DOI: 10.3390/ma14205979] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 09/29/2021] [Accepted: 10/07/2021] [Indexed: 11/17/2022]
Abstract
Thin and single MoS2 flakes are envisioned to contribute to the flexible nanoelectronics, particularly in sensing, optoelectronics and energy harvesting. Thus, it is important to study their stability and local surface reactivity. Their most straightforward surface reactions in this context pertain to thermally induced interactions with atmospheric oxygen. This review focuses on local and thermally induced interactions of MoS2 crystals and single MoS2 flakes. First, experimentally observed data for oxygen-mediated thermally induced morphological and chemical changes of the MoS2 crystals and single MoS2 flakes are presented. Second, state-of-the-art mechanistic insight from computer simulations and arising open questions are discussed. Finally, the properties and fate of the Mo oxides arising from thermal oxidation are reviewed, and future directions into the research of the local MoS2/MoOx interface are provided.
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Affiliation(s)
- Robert Szoszkiewicz
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland
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