Article
Chemistry, Multidisciplinary
Xueyin Bai, Shisheng Li, Susobhan Das, Luojun Du, Yunyun Dai, Lide Yao, Ramesh Raju, Mingde Du, Harri Lipsanen, Zhipei Sun
Summary: The study demonstrates the successful synthesis of high-quality vertical bilayer MoS2/WS2 heterostructures with a grain size of up to 60 µm through a single-step CVD process. Unlike normal pyramid structures, an anti-pyramid MoS2/WS2 structure was synthesized, providing new insights into the synthesis and applications of two-dimensional heterostructures.
Article
Chemistry, Physical
Eric Navarrete, Frank Guell, Paulina R. Martinez-Alanis, Eduard Llobet
Summary: Different thicknesses of Au films were used in the growth of ZnO nanowires, with the 6 nm thick layers showing the most stable and repeatable gas sensing properties. Despite ZnO nanowires grown using the thickest Au layers reaching the highest responses under dry conditions, those grown using the thinnest Au film were more resilient at detecting NO2 in the presence of ambient moisture. The gas sensing results were discussed in light of defects and Au impurities in the ZnO nanowires, as revealed by characterization techniques such as X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Chemistry, Physical
Luca Seravalli, Matteo Bosi
Summary: Two-dimensional materials like graphene, transition metal dichalcogenides, and boron nitride show great potential for novel applications in sensing and electronic devices; among various methods, chemical vapour deposition is a promising technique for obtaining 2D layers of different materials. Control and reproducibility of synthesis are crucial for driving the development of 2D materials.
Article
Chemistry, Physical
Guanmeng Li, Weifeng Zhang, Yan Zhang, Yangjin Lee, Zihan Zhao, Xue-zhi Song, Zhenquan Tan, Kwanpyo Kim, Nan Liu
Summary: Synergistic additives, ammonium salts, have been used in the chemical vapor deposition (CVD) growth of MoS2 to achieve controlled domain layering and shape, as well as centimeter-scale films. This method enables direct fabrication of MoS2 electronic devices on clean substrates without the need for transfer steps, and it also promotes improved hydrogen evolution reaction (HER) performance. The use of ammonium salts in CVD paves the way for practical applications of MoS2 in modern electronics and catalysis.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Binbin Ding, Lianbi Li, Lei Li, Changjun Zhu, Zebin Li, Guoqing Zhang, Dezhong Cao, Caijuan Xia, Wenzhi Yu
Summary: Stacking structures have the potential to modulate physical properties of two-dimensional materials. This study reports a simple and effective method for manufacturing multilayer stacking MoS2 crystal microstructures. The epitaxial growth mechanism is investigated through the study of trilayer stacking MoS2 with different shapes. Raman and photoluminescence mapping show high homogeneity and clear boundary contrast between the different structures. The results demonstrate the high carrier mobility and on/off ratio of the trilayer MoS2 microstructure field-effect transistor, which is influenced by the stacking configuration. Moreover, the formation of type I junction between different structures and the observation of photocurrent in the junction region are noted. Additionally, the study reveals the presence of twisted Moire' superlattices in the 15.3 degrees twisted bilayer AB-stacking MoS2 with a period of 1.39+/-0.05 nm. This work provides valuable insights for the development and application of multilayer-stacking MoS2.
APPLIED SURFACE SCIENCE
(2023)
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, Coatings & Films
Christian Micallef, Cheng-Wei Chiu, Yuri Zhuk, Adrianus Indrat Aria
Summary: This study explored the electropolishing behavior of hard W/WC coatings, investigating optimal parameters for achieving a mirror-like surface finish and coating thickness change. Comparing the effects of different electrolyte concentrations, it was found that 5wt% NaOH was more stable than 3wt% and resulted in a better overall surface finish.
SURFACE & COATINGS TECHNOLOGY
(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
Chemistry, Physical
Lachlan M. Oberg, Marietta Batzer, Alastair Stacey, Marcus W. Doherty
Summary: This study investigates the catalytic effect of surface-embedded nitrogen on diamond growth, revealing that nitrogen can promote nucleation of new diamond layers. A new model and mechanism for nitrogen overgrowth are proposed, shedding light on the role of nitrogen in enhancing diamond growth.
Article
Chemistry, Multidisciplinary
Xiaolong Zhu, Zipei Su, Chen Wu, Hengjiang Cong, Xinping Ai, Hanxi Yang, Jiangfeng Qian
Summary: The method of intercalation and exfoliation of MoS2 using pyrene lithium (Py-Li) as a lithium reagent has been reported. The redox potential of Py-Li is located between the intercalation and decomposition potentials of MoS2, allowing precise Li+ intercalation and obtaining almost single-layer nanosheets at room temperature. This method is cost-effective, repeatable, and suitable for large-scale production.
Article
Energy & Fuels
V. Thirumal, R. Yuvakkumar, P. Senthil Kumar, Gayathri Rangasamy, G. Ravi, M. Isacfranklin, Dhayalan Velauthapillai, M. Thambidurai, Hung D. Nguyen
Summary: In this study, carbon nanotube (CNT) electrodes with excellent electrochemical performance were prepared using chemical vapor deposition method. The results showed that CNTs synthesized on Ni-foam substrate exhibited lower overpotential and resistance, and demonstrated efficient catalytic activity for hydrogen evolution reaction. This method offers a cost-effective and reliable approach for electrochemical water splitting.
Article
Chemistry, Multidisciplinary
Arvind Mukundan, Yu-Ming Tsao, Sofya B. Artemkina, Vladimir E. Fedorov, Hsiang-Chen Wang
Summary: This study investigates the mechanism of MoS2 growth in a substrate with a periodic structure. Through controlling the precursor, growth conditions, and gas flow rate, MoS2 successfully grows in the region of the periodic holes. Various analysis methods are used to confirm the growth layers of MoS2. The growth mechanism is studied using transmission electron microscopy. The results of this research provide valuable references for the large-scale periodic growth of MoS2.
Article
Chemistry, Multidisciplinary
Jichen Dong, Degong Ding, Chuanhong Jin, Yunqi Liu, Feng Ding
Summary: We present a systematic theoretical study on the CVD growth mechanism of MoS2 and propose a transition of growth from Mo-II edges to S-III edges and Mo-III edges by tuning the growth condition from Mo-rich to S-rich. This study provides a general guideline on theoretical studies of 2D crystals' growth mechanisms and deepens our understanding on the growth mechanism of multielement 2D crystals.
Article
Energy & Fuels
T. Moser, R. Kothandaraman, S. Yang, A. Walter, S. Siegrist, H. Lai, E. Gilshtein, A. N. Tiwari, F. Fu
Summary: This study aims to extend the understanding of the formation processes of (Cs(0.07)FA(0.93))PbI3 perovskite layers deposited by a two-step vapour method. It shows that the crystallinity and morphology of the TE precursor layer are influenced by both the substrate surface properties and thermal treatment in the initial phase of the CVD process, and how a uniform elemental composition is achieved by the diffusion of cesium through PbI2 during the CVD conversion reaction.
FRONTIERS IN ENERGY RESEARCH
(2022)
Review
Chemistry, Multidisciplinary
Christos Tsakonas, Marinos Dimitropoulos, Anastasios C. Manikas, Costas Galiotis
Summary: This review explores past attempts to use liquid metal catalysts for the production of 2D materials, focusing on graphene growth and emphasizing crystal growth mechanisms and film coverage. The advent of online metrology for monitoring chemical processes under liquid metal catalyst conditions is also discussed, along with future development directions.
Article
Chemistry, Multidisciplinary
Meixia Su, Wenda Zhou, Lin Liu, Mingyue Chen, Zhenzhen Jiang, Xingfang Luo, Yong Yang, Ting Yu, Wen Lei, Cailei Yuan
Summary: This study designs a screw pyramid MoS2 material to eliminate the interlayer potential barrier, facilitating the generation of micro eddy current and enhancing electrocatalytic activity.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Yuan Liu, Wufei Gong, Shenman Yao, Yan Liang, Yanxing Yang, Ting Yu, Cailei Yuan, Yong Yang
Summary: In this study, a novel Mn-doped CoP/Ni(PO3)(2) heterostructure array electrocatalyst was designed, which improved the performance of Co-based phosphide electrocatalyst through the synergistic coupling of metal-doping and phosphate surface decoration. This work provides a new strategy for the development of highly efficient electrocatalysts for overall water splitting.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Jinli Huang, Wenda Zhou, Xingfang Luo, Yan Ding, Dongquan Peng, Mingyue Chen, Hang Zhou, Ce Hu, Cailei Yuan, Shouguo Wang
Summary: It has been proven that introducing alternating magnetic field (AMF) can effectively enhance the catalytic performance of magnetic nanoparticles (NPs) electrocatalysts. This study proposes a feasible design to confine monodispersed ultra-small NiSe2_X NPs in an amorphous carbon matrix and demonstrates that under AMF, the confined NPs experience spin flips that generate magnetic heating, leading to a significant improvement in hydrogen evolution reaction performance. This work provides new ideas for the preparation of ultra-small monodispersed NPs electrocatalysts that can utilize AMF to enhance catalytic performance, which is crucial for accelerating clean energy production.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Wei Zeng, Zhenzhen Jiang, Xunguo Gong, Ce Hu, Xingfang Luo, Wen Lei, Cailei Yuan
Summary: This study demonstrates the implementation of atomic magnetic heating on specific single atoms in Gd@MoS2 single-atom catalysts (SACs) using high-frequency alternating magnetic field (AMF) technology, resulting in significant improvement in catalytic kinetics and hydrogen evolution reaction efficiency. The promotion in catalyst activity is attributed to spin flip in Gd single atoms leading to atomic magnetic heating effect on catalytic active center, as supported by theoretical calculations and electrochemical experiments.
Article
Chemistry, Multidisciplinary
Dongquan Peng, Ce Hu, Xingfang Luo, Jinli Huang, Yan Ding, Wenda Zhou, Hang Zhou, Yong Yang, Ting Yu, Wen Lei, Cailei Yuan
Summary: This study successfully confined EC-reconstructed NiFe/NiFeOOH core/shell nanoparticles in a highly conductive carbon matrix, leading to significant improvement in oxygen evolution reaction (OER) electrocatalytic activity. Furthermore, the OER efficiency was further enhanced through the functionalization of superparamagnetic NiFe cores using magnetic heating effect.
Article
Chemistry, Multidisciplinary
Zhenzhen Jiang, Wenda Zhou, Ce Hu, Xingfang Luo, Wei Zeng, Xunguo Gong, Yong Yang, Ting Yu, Wen Lei, Cailei Yuan
Summary: An ingenious approach of confining dual atoms (DAs) of Ni and Fe within the interlayer of MoS2 is proposed, which exhibits exceptional adsorption strength and catalytic activity in acidic water splitting. The interlayer-confined structure also provides protection for the metal DAs in harsh acidic environment.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Yong Yang, Yuan Liu, Shenman Yao, Wufei Gong, Yan Liang, Ting Yu, Cailei Yuan
Summary: The development of non-noble metal-based bifunctional electrocatalysts for overall water splitting is urgent. In this study, a self-supported rare earth Ce-doped Ni5P4 porous nanosheets array is designed as an efficient bifunctional electrocatalyst, showing a competitive overall water splitting potential and high catalytic activity. The introduction of Ce reduces charge transfer resistance and increases active sites of Ni5P4, while DFT theoretical calculations reveal the regulation of Ce doping on the d-band center and adsorption of reaction intermediates.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Zhenzhen Jiang, Ce Hu, Xingfang Luo, Xunguo Gong, Wei Zeng, Chengwu Zou, Hang Zhou, Wenda Zhou, Ting Yu, Wen Lei, Cailei Yuan
Summary: Further uprating the catalytic activities of diatomic active sites while maintaining the atomic loading and diatomic coordination by external stimulation is a promising way to improve diatomic site catalysts. The NiFe@MoS2 DASCs treated with external high-frequency alternating magnetic field exhibit a superior cell voltage of 1.576 V and a current density of 10 mA cm(-2) in alkaline water electrolysis compared to those without magnetic field treatment (1.652 V). The selective magnetic heating of bifunctional diatomic active site proposed in this work can open up new possibilities for the design of highly efficient catalysts for various energy-related reactions.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Linyi Wu, Yipei Li, Binghua Zhou, Jian Liu, Deliang Cheng, Shien Guo, Keng Xu, Cailei Yuan, Mingxi Wang, Gan Jet Hong Melvin, Josue Ortiz-Medina, Sajjad Ali, Teng Yang, Yoong Ahm Kim, Zhipeng Wang
Summary: Coupling graphene-based materials with SiC nanostructures is an effective strategy for improving photocatalytic CO2 reduction performance. In this study, vertical graphene (VG) sheets were synthesized on SiC nanowires derived from rice husks to form the VG@SiC/C composite. The resulting composite exhibited enhanced photocatalytic CO2 reduction, yielding CO and CH4 with yields of 25.5 and 2.3 μmol g-1 h-1, respectively, which is the highest CO yield among SiC-based photocatalysts. Defective VG sheets promoted sunlight absorption, CO2 adsorption and activation, electron-hole pair separation, and overall photocatalyst activity, leading to high CO2 reduction yield and selectivity.
Article
Chemistry, Physical
Songqing Zhang, Han Wang, Wenwu Pan, Huijia Luo, Yongling Ren, Yujun Liang, Jin Tan, Cailei Yuan, Wen Lei
Summary: In this study, Sb2Se3 nanotubes were grown by chemical vapor deposition and their novel applications in polarization-sensitive near-infrared photodetectors were investigated. The grown Sb2Se3 nanotubes exhibited high crystal quality and specific dimensions. The fabricated singular Sb2Se3 nanotube-based photodetector showed a wide spectral response and excellent performance under the illumination of near-infrared light.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yong Yang, Shenman Yao, Wufei Gong, Yan Liang, Ting Yu, Cailei Yuan
Summary: A hierarchical Z-scheme heterostructure microsphere of MoS2/SnO2 is designed and prepared, showing outstanding NO2 sensing performance at room temperature under the excitation of a low-power LED light. The Z-scheme heterostructure promotes the separation of photogenerated carriers and provides abundant active sites for gas sensing reactions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Mingyue Chen, Wenda Zhou, Kun Ye, Cailei Yuan, Mengyuan Zhu, Hao Yu, Hongzhou Yang, He Huang, Yanfei Wu, Jingyan Zhang, Xinqi Zheng, Jianxin Shen, Xiao Wang, Shouguo Wang
Summary: This study successfully confines monodisperse 1T-VSe2 nanoparticles in an amorphous carbon matrix using a facile pulsed laser deposition (PLD) method combined with rapid thermal annealing (RTA) treatment. With external magnetic fields of 800 mT stimulation, these confined 1T-VSe2 nanoparticles exhibit highly efficient oxygen evolution reaction (OER) catalytic activity and remarkable durability. The experimental results demonstrate that magnetic fields can facilitate the surface charge transfer dynamics of 1T-VSe2, and modify the adsorption-free energy of *OOH, thus improving the intrinsic activity of the catalysts. This work realizes the application of ferromagnetic VSe2 electrocatalyst in highly efficient spin-dependent OER kinetics and promotes the application of transition metal chalcogenides (TMCs) in external magnetic field-assisted electrocatalysis.
Article
Engineering, Environmental
Wufei Gong, Shenman Yao, Yan Liang, Bin Chen, Yanxing Yang, Xingfang Luo, Ting Yu, Cailei Yuan, Yong Yang
Summary: Light irradiation is a promising strategy for room temperature sensing in semiconductor gas sensors, but the recombination rate of photo-generated carriers and poor visible light response of conventional sensing materials limits performance improvement. This study successfully developed a novel Z-scheme NiO/Bi2MoO6 heterostructure that showed excellent room temperature gas response towards ether under visible light irradiation. The heterostructure improved carrier separation and ether adsorption, and the visible light response of NiO/Bi2MoO6 enhanced light utilization. The in-situ construction of the heterostructure array also minimized problems associated with traditional thick film devices. This work provides important insights into the room temperature sensing performance and gas sensing mechanism of Z-scheme heterostructures.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Physical
Xiaobo Chen, Yipei Li, Mingliang He, Binghua Zhou, Deliang Cheng, Shien Guo, Keng Xu, Cailei Yuan, Mingxi Wang, Hironori Ogata, Gan Jet Hong Melvin, Yoong Ahm Kim, Mauricio Terrones, Morinobu Endo, Zhipeng Wang
Summary: Vertical graphene (VG) has unique three-dimensional structures and excellent physicochemical properties, making it a promising material for supercapacitors. In this study, large-scale VG films were synthesized on flexible substrates, and a novel battery-like supercapacitor (BSCs) was designed using VG on Ni foil (VG@Ni) as a binder-free electrode in KOH electrolyte with redox additives. The VG@Ni electrodes exhibited high areal capacitance, coulombic efficiency, and cycling stability. The BSCs assembled with VG@Ni electrodes showed impressive areal capacitance, energy density, and power density, thanks to the special features and properties of VG materials, high electronic conductivity of the binder-free VG@Ni electrode, and synergistic effects with the redox electrolyte.
JOURNAL OF POWER SOURCES
(2023)
Article
Energy & Fuels
Mingliang He, Gan Jet Hong Melvin, Mingxi Wang, Wanli Fan, Jingwen Lin, Xiaobo Chen, Keng Xu, Cailei Yuan, Yongyi Zhang, Fei Zhang, Zhipeng Wang
Summary: The low conductivity of metal-organic frameworks is a limitation for their applications in electrochemical energy storage and conversion. To overcome this, the researchers synthesized zeolitic imidazolate framework-67 on vertical graphene with abundant defects grown on carbon cloth. They derived Co3O4 nanoparticles and nanoporous carbon from ZIF67-VG-CC, and observed high specific capacitance and excellent rate capability in the resulting materials.
JOURNAL OF ENERGY STORAGE
(2023)
