Article
Chemistry, Multidisciplinary
Qilong Wu, Xiaoshuai Fu, Ke Yang, Hongyu Wu, Li Liu, Li Zhang, Yuan Tian, Long-Jing Yin, Wei-Qing Huang, Wen Zhang, Ping Kwan Johnny Wong, Lijie Zhang, Andrew T. S. Wee, Zhihui Qin
Summary: This study demonstrates a practical approach to producing highly crystalline monolayer MoSe2 using high-temperature-annealed Au foil as a weakly interacting substrate for atmospheric pressure chemical vapor deposition. The low-temperature scanning tunneling microscopy/spectroscopy measurements reveal a honeycomb structure of MoSe2 with a quasi-particle bandgap of 1.96 eV. The weak coupling between the Au(100) surface and MoSe2 is critical for easy transfer of monolayers to another host substrate.
Article
Chemistry, Physical
C. Gonzalez, J. P. B. Silva, A. S. Viana, K. Gwozdz, O. Conde
Summary: In this study, we demonstrate the controllable synthesis of monolayer MoSe2 flakes with various shapes using chemical vapor deposition. We also find that the shape and size greatly affect the photoluminescence response of the MoSe2 flakes. These findings open up new possibilities for morphology-controlled monolayer MoSe2 flakes in optoelectronic and energy harvesting systems.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Ary Anggara Wibowo, Mike Tebyetekerwa, Anh Dinh Bui, Thien N. Truong, Sandra Saji, Felipe Kremer, Zhongshu Yang, Zongyou Yin, Yuerui Lu, Daniel Macdonald, Hieu T. Nguyen
Summary: In this study, a method for growing large-area, high-quality MoSe2 monolayers and MoSe2-WSe2/WSe2-MoSe2 lateral heterostructures using molten salt-based chemical vapor deposition (CVD) is reported. The effects of different catalysts on the growth and optoelectronic quality of the materials are investigated, and it is found that molten salt catalysts support high-quality growth of MoSe2 monolayers and WSe2-MoSe2 lateral heterostructures.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Yuqing Li, Yuyan Zhao, Xiaoqian Wang, Wanli Liu, Jiazhen He, Xuemin Luo, Jinfeng Liu, Yong Liu
Summary: By regulating the growth conditions, we achieved the growth of large-size films of single atomic layers with thicknesses of only about 1 nm. Our method is effective for the growth of large-area films with universal applicability.
Article
Chemistry, Inorganic & Nuclear
Debjit Ghoshal, Rajesh Kumar, Nikhil Koratkar
Summary: In this study, a facile approach for controlled one step Rhenium doping in multilayer Molybdenum Disulphide (MoS2) was developed. The morphology of MoS2 was found to be dependent on the dopant concentrations, with a flower-like morphology observed at higher doping concentrations. A clear correlation between the shift in PL and Raman peaks as a function of Re doping concentrations was demonstrated, indicating potential applications of controllably doped thin layers of MoS2 in unexplored areas.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Liam P. McDonnell, Jacob J. S. Viner, David A. Ruiz-Tijerina, Pasqual Rivera, Xiaodong Xu, Vladimir Fal'ko, David C. Smith
Summary: Hybridization of electronic bands in two-dimensional materials assembled into twistronic heterostructures allows for tuning of optoelectronic properties and qualitative modification of excitons. Resonance Raman scattering provides direct evidence for exciton hybridization in twistronic structures, aiding in quantifying layer composition.
Article
Chemistry, Multidisciplinary
Daniel Vaquero, Juan Salvador-Sanchez, Vito Clerico, Enrique Diez, Jorge Quereda
Summary: In this study, the electronic response of exciton transitions in monolayer MoSe2 was investigated using low-temperature photocurrent spectroscopy. Spectral features associated with the main exciton and trion transitions were identified, and the effect of the Fermi level on the position and intensity of excitonic spectral features was observed.
Article
Chemistry, Multidisciplinary
Thilo Hahn, Diana Vaclavkova, Miroslav Bartos, Karol Nogajewski, Marek Potemski, Kenji Watanabe, Takashi Taniguchi, Pawel Machnikowski, Tilmann Kuhn, Jacek Kasprzak, Daniel Wigger
Summary: Monolayers of transition metal dichalcogenides exhibit strong excitonic optical response and when encapsulated with hexagonal boron nitride, they can achieve a purely homogeneously broadened exciton system. Ultrafast six-wave mixing spectroscopy on a MoSe2-based system revealed a novel destructive photon echo effect, which arises from destructive interference in successive repetitions of the heterodyning experiment.
Article
Nanoscience & Nanotechnology
Won Tae Kang, Thanh Luan Phan, Kyung Jin Ahn, Ilmin Lee, Young Rae Kim, Ui Yeon Won, Ji Eun Kim, Young Hee Lee, Woo Jong Yu
Summary: This study demonstrates direct growth of MoSe2 films on selective pattern areas via a surface-mediated liquid-phase promoter using a solution-based approach, resulting in highly uniform films and the ability to produce other TMD films. The approach also allows control over various pattern shapes, sizes, and large-scale areas, improving applicability in future devices. The patterned MoSe2 field-effect transistor device exhibits a p-type dominant conduction behavior with a high on/off current ratio, providing guidance for future design of integrated devices for large-scale application.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Hiroo Suzuki, Yijun Liu, Masaaki Misawa, Chiyu Nakano, Yingzhe Wang, Ryo Nakano, Kentaro Ishimura, Kenji Tsuruta, Yasuhiko Hayashi
Summary: This study investigates the intermediate state and characteristic Raman modes of Janus MoSeS during plasma processing. The intermediate partially substituted Janus (PSJ) structure is revealed through atomic composition analysis and atomic scale structural observations. The discontinuous transitions in the photoluminescence spectrum cannot be explained by theoretical calculations. These findings contribute to the understanding of the formation process and electronic-state modulation of Janus TMDCs.
Review
Chemistry, Multidisciplinary
Shaohua Li, Decai Ouyang, Na Zhang, Yi Zhang, Akshay Murthy, Yuan Li, Shiyuan Liu, Tianyou Zhai
Summary: This review focuses on the use of substrate engineering strategies for the controlled growth of large-scale 2D transition metal dichalcogenides (TMDs). It provides insights into the interaction between TMDs and substrates and summarizes the effects of various substrate engineering approaches on the growth of 2D TMDs. The review also discusses the opportunities and challenges of substrate engineering for the future development of 2D TMDs.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Lianpeng Xu, Jianxin Zhou, Zhe He, Junbin Hu, Mengran Liu
Summary: Large-scale preparation of bilayer WSe2 is crucial for integrated electronic/photoelectric devices. A CVD approach for growing millimeter-sized bilayer WSe2 on SiO2/Si substrates has been developed in this study by finely controlling hydrogen flow and growth temperature. The resulting CVD bilayers exhibit similar spectroscopic characteristics to exfoliated bilayers, providing a simple pathway for scalable growth of bilayer WSe2.
Article
Nanoscience & Nanotechnology
Kongjia Zheng, Jianjun Deng, Zhonghao Zhou, Jinglong Chen, Zhiyong Wang, Zhihai Cheng
Summary: A method for preparing centimeter-scale MoSe2 films with uniform and high SERS activity is reported, demonstrating the strong SERS effect of monolayer MoSe2 film attributed to charge transfer between MoSe2 and probe molecules. Due to its atomic uniformity and chemical stability, MoSe2 film can serve as an ideal two-dimensional SERS material for detection of various molecules.
Article
Chemistry, Physical
Rui Ji, Jing Liao, Lintao Li, Rongji Wen, Mengjie Liu, Yifeng Ren, Jianghua Wu, Yunrui Song, Minru Qi, Zhixing Qiao, Liwei Liu, Chengbing Qin, Yu Deng, Yongtao Tian, Suotang Jia, Yufeng Hao
Summary: In this study, we grew large-scale and high-quality MoSe2 films through metal-organic chemical vapor deposition (MOCVD) guided by the crystalline step edges of miscut sapphire wafers. The nucleation density and growth rate of MoSe2 films were found to be influenced by the step-edge density and growth temperature. MoSe2 domains grown on substrates with higher step-edge density exhibited faster growth, leading to the formation of wafer-scale and continuous MoSe2 films in a short duration. The high crystalline quality of the MoSe2 films was confirmed by Raman and photoluminescence (PL) measurements. This study provides a significant methodology for rapid growth of large-scale TMDCs and may contribute to the application of 2D semiconductors.
Article
Chemistry, Physical
Xu Yang, Shisheng Li, Naoki Ikeda, Yoshiki Sakuma
Summary: A newly developed oxide scale sublimation chemical vapor deposition (OSSCVD) technique for 2D MoS2 growth is reported, allowing stable growth by controlling the supply of MoO3. Using Dragontrail glass as a catalytic substrate enables the growth of large single-crystalline MoS2 domains.
Article
Chemistry, Multidisciplinary
Tian Carey, Oran Cassidy, Kevin Synnatschke, Eoin Caffrey, James Garcia, Shixin Liu, Harneet Kaur, Adam G. Kelly, Jose Munuera, Cian Gabbett, Domhnall O'Suilleabhain, Jonathan N. Coleman
Summary: This study presents a method to obtain large-area semiconducting flakes of tungsten diselenide (WSe2) and tungsten disulfide (WS2) through electrochemical exfoliation. The flakes are then aligned and conformal using Langmuir-Schaefer coating technique. The fabricated electrochemical transistors exhibit high mobility and good performance on bending substrates, making them potentially valuable for flexible electronics applications.
Article
Chemistry, Multidisciplinary
Stefano Ippolito, Francesca Urban, Wenhao Zheng, Onofrio Mazzarisi, Cataldo Valentini, Adam G. Kelly, Sai Manoj Gali, Mischa Bonn, David Beljonne, Federico Corberi, Jonathan N. Coleman, Hai I. Wang, Paolo Samori
Summary: In this article, the charge-transport mechanisms of printed devices based on covalent MoS2 networks are studied, comparing the effects of aromatic versus aliphatic dithiolated linkers. The results show that aliphatic systems lead to 3D variable range hopping, while aromatic linkers exhibit nearest neighbor hopping. The improved performance of devices functionalized with pi-conjugated molecules is attributed to enhanced interflake electronic connectivity and additional percolation paths.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Hugo Nolan, Christian Schroder, Marc Brunet-Cabre, Filippo Pota, Niall McEvoy, Kim McKelvey, Tatiana S. Perova, Paula E. Colavita
Summary: The study investigates the effects of N-functionalities on MoS2 supported on carbon for hydrogen evolution reaction (HER) performance. It is found that the presence of pyridinic-N groups at the carbon support suppresses HER activity at high pH due to the modulation of deprotonation and lone-pair availability. This suggests important implications for the design of heterostructured electrocatalysts to control performance in HER electrocatalysis by exploiting synergistic/inhibitory behaviors.
Article
Chemistry, Physical
Daire Tyndall, Michael John Craig, Lee Gannon, Cormac McGuinness, Niall McEvoy, Ahin Roy, Max Garcia-Melchor, Michelle P. Browne, Valeria Nicolosi
Summary: Nickel-iron layered double hydroxides are highly active catalysts for the oxygen evolution reaction, but their stability within the active voltage window is limited. This study identifies the source of catalyst instability by tracking changes in the material during OER activity. In-situ and ex-situ Raman analyses reveal long-term effects on catalyst performance due to crystallographic phase changes. Electrochemically stimulated compositional degradation and leaching of Fe metals from highly active edge sites are identified as the main causes of activity loss.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Kangho Lee, Beata M. Szydlowska, Oliver Hartwig, Kevin Synnatschke, Bartlomiej Tywoniuk, Tomas Hartman, Tijana Tomasevic-Ilic, Cian P. Gabbett, Jonathan N. Coleman, Zdenek Sofer, Marko Spasenovic, Claudia Backes, Georg S. Duesberg
Summary: Liquid-phase exfoliation (LPE) is a versatile and scalable method for producing two-dimensional (2D) materials. In this study, highly conductive films made of platinum diselenide (PtSe2) flakes were successfully fabricated using LPE. These films showed uniform morphology and electrical behavior, and were used to create a chemiresistive sensor structure capable of detecting ammonia gas at sub-0.1 parts per million (ppm) levels. Remarkably, the PtSe2-based devices remained fully functional even after 15 months, demonstrating their high stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Rita Tilmann, Cian Bartlam, Oliver Hartwig, Bartlomiej Tywoniuk, Nikolas Dominik, Conor P. Cullen, Lisanne Peters, Tanja Stimpel-Lindner, Niall McEvoy, Georg S. Duesberg
Summary: The interest in 2D materials is increasing due to the discovery of compounds with unique electrical, optical, chemical, and thermal characteristics. We report the presence of polymeric adlayers on layered transition metal dichalcogenides (TMDs), which are not easily identifiable using common analytic methods. These atomically thin layers consist of hydrocarbons, which preferentially adsorb to the hydrophobic surfaces of TMDs. The presence of polymeric films on 2D materials has implications for their investigation, processing, and applications.
Article
Chemistry, Multidisciplinary
James R. Garcia, Mark McCrystal, Dominik Horvath, Harneet Kaur, Tian Carey, Jonathan N. Coleman
Summary: In this study, a new class of piezoresistive nanocomposites was developed by mixing different types of 2D nanosheets. It was found that the conductivity of each nanocomposite type exhibited a different dependence on filler volume fraction, and they also showed different piezoresistive properties. This research expands the understanding of piezoresistive nanocomposites and provides a platform for the engineering of high-performance strain sensors.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Anna Zhuravlova, Antonio Gaetano Ricciardulli, Dawid Pakulski, Adam Gorczynski, Adam Kelly, Jonathan N. Coleman, Artur Ciesielski, Paolo Samori
Summary: Chemical sensing of water contamination by heavy metal ions is a severe environmental problem. Two-dimensional transition metal dichalcogenides (TMDs) show potential as chemical sensors due to their high surface-to-volume ratio and unique electrical characteristics, but lack selectivity. In this study, defect-rich MoS2 flakes were functionalized to develop ultrasensitive and selective sensors for cobalt(II) ions. Through a tailored microfluidic approach, a continuous network was formed by healing the sulfur vacancies in MoS2, enabling high control over the assembly of thin and large hybrid films. The developed sensor exhibited a low limit of detection, broad concentration range, and high selectivity towards Co2+ ions.
Article
Chemistry, Physical
Sergio Pinilla, Sean Ryan, Lorcan McKeon, Meiying Lian, Sebastien Vaesen, Ahin Roy, Wolfgang Schmitt, Jonathan N. Coleman, Valeria Nicolosi
Summary: Additive manufacturing strategies are gaining importance in lithium-ion battery field due to their advantages such as rapid prototyping, waste reduction, and complex 3D structures. These techniques are also gaining attention for micro-energy storage devices. In this study, various additive manufacturing techniques were compared to standard methodologies, evaluating their electrochemical performance and correlating it with physical changes induced by the printing process. The use of LTO/CNT-based inks revealed that the arrangement of conductive additives significantly affects the rate performance of the device, and a model was used to identify the limiting factor on printed electrodes and correlate it with the material arrangement produced by each technique.
ADVANCED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Adam G. Kelly, Siadhbh Sheil, Danielle A. Douglas-Henry, Eoin Caffrey, Cian Gabbett, Luke Doolan, Valeria Nicolosi, Jonathan N. Coleman
Summary: Transparent conductors are essential in many applications, and there is a demand for higher performing and cheaper alternatives. This study presents a high-performance transparent conductor made of silver nanosheets printed using aerosol jet printing. By annealing the silver nanosheets and adjusting the grid structure, high transparency and low resistance can be achieved.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Electrochemistry
Dominik V. Horvath, Valeria Nicolosi, Jonathan N. Coleman
Summary: This study quantitatively examines the relationship between the volumetric capacity of Li-storing electrodes and their rate performance, showing that capacity and rate performance are anti-correlated. This observation is consistent with a simple physical model which explains this effect based on the RC charging time of the electrode.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Shixin Liu, Tian Carey, Jose Munuera, Kevin Synnatschke, Harneet Kaur, Emmet Coleman, Luke Doolan, Jonathan N. Coleman
Summary: A reliable solution-processing method is reported for fabricating heterojunction diodes with tungsten selenide nanosheets as the optical absorbing material. The obtained heterojunctions show high rectification ratios without relying on heavily doped silicon substrates and exhibit self-powered behaviors at zero bias.
Meeting Abstract
Cell & Tissue Engineering
Jack Maughan, Pedro J. Gouveia, Adrian Dervan, Jonathan N. Coleman, Fergal J. O'Brien
TISSUE ENGINEERING PART A
(2023)
Article
Chemistry, Multidisciplinary
Floriana Morabito, Kevin Synnatschke, Jake Dudley Mehew, Sebin Varghese, Charles James Sayers, Giulia Folpini, Annamaria Petrozza, Giulio Cerullo, Klaas-Jan Tielrooij, Jonathan Coleman, Valeria Nicolosi, Christoph Gadermaier
Summary: Liquid-phase exfoliation enables the production of nanosheet films of 2D semiconductors with exceptionally long carrier lifetime, which is suitable for applications such as light harvesting and sensing.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Kuanysh Zhussupbekov, Lida Ansari, Kenan Elibol, Ainur Zhussupbekova, Jani Kotakoski, Igor V. Shvets, Georg S. Duesberg, Paul K. Hurley, Niall Mcevoy, Cormac O'Coileain, Farzan Gity
Summary: The properties and performance of platinum diselenide (PtSe2) films, synthesized by thermally assisted conversion, were investigated using various spectroscopic and microscopic methods. The presence of distinct edge states was observed, and the origin of these states was investigated using theoretical tools and atomistic modeling. The results showed that the edges of polycrystalline films can have semiconducting or semimetallic properties depending on their configuration. The study also explored the potential of using a monomaterial heterojunction based field-effect transistor, which demonstrated excellent performance due to the critical role of the edge states in facilitating carrier transport.
APPLIED MATERIALS TODAY
(2023)
