Article
Nanoscience & Nanotechnology
Mingying Lu, Haining Ji, Yong Zhao, Yongxing Chen, Jundong Tao, Yangyong Ou, Yi Wang, Yan Huang, Junlong Wang, Guolin Hao
Summary: Two-dimensional (2D) materials have desirable properties for various applications, but their controllable synthesis remains challenging. Machine learning (ML) can help discover insights from a large amount of data, reducing computational costs and development cycles. In this study, ML algorithms were used to explore parameters for synthesizing the 2D material MoS2, and XGBoost showed the best performance with high accuracy and AUROC.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Ruijie Zhang, Yajing Sun, Fei Jiao, Lin Li, Dechao Geng, Wenping Hu
Summary: As a new paradigm of material science, two-dimensional (2D) heterostructured composites have attracted extensive interests because of combining the collective advantages and collaborative characteristics of individual building blocks. Molybdenum disulfide (MoS2) has demonstrated great promise as a low-cost substitute to platinum-based catalysts for electrochemical hydrogen production. However, the broad adoption of MoS2 is hindered by its limited number of active sites and low inherent electrical conductivity. One of the promising methods to further activate MoS2 is coupling engineering. Here, we demonstrate for the first time the synthesis of 2D MXene-MoS2 nanocomposites through chemical vapor deposition (CVD) approach, thus leading to precise design in structure type and orientation. The computational results show that nanocomposites have metallic properties. Owing to their unique 2D/2D structure, MXene-MoS2 nanocomposites exhibit more active catalytic sites, resulting in higher electrochemical performance, as inherited from parent excellent characteristics, and a much lower overpotential of similar to 69 mV at a current density of 10 mA center dot cm(-2) is achieved. This work paves the way to employ CVD method by coupling engineering to construct 2D nanocomposites for energy storage applications.
Article
Chemistry, Physical
F. Esposito, M. Bosi, G. Attolini, F. Rossi, S. E. Panasci, P. Fiorenza, F. Giannazzo, F. Fabbri, L. Seravalli
Summary: The objective of this study was to compare MoS2 2-dimensional monolayer flakes grown by Chemical Vapour Deposition using different density gradients in the liquid precursors solution. The structures grown using glycerol showed a larger variability in the lateral size of the triangular structure with good crystalline quality, while structures grown using iodixanol exhibited poorer crystalline quality with nanometric pores and more homogeneous sizing of the triangular structures. The lower crystalline quality of iodixanol samples resulted in reduced light emission efficiency and lower mobility.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Bin Li, Qiankun Ju, Wenting Hong, Qian Cai, Jinxin Lin, Wei Liu
Summary: The study successfully synthesized a novel molybdenum disulfide using chemical vapor deposition, with the synthesis reaction being carried out in an inert gas environment. The use of a high concentration of molybdenum precursor helped control the morphology of molybdenum disulfide, leading to the innovative method for synthesizing bilayer molybdenum disulfide.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Youngseo Jeon, Jihyung Seo, Jihyun Kim, Dongjoon Rhee, Myeongjin Jung, Hyesung Park, Joohoon Kang
Summary: The authors of the article presented a novel method for preparing high-quality monolayer MoSe2 films and demonstrated a wafer-scale, gate-tunable photodetector array with superior optoelectronic properties using a growth promoter-assisted growth strategy. The MoSe2 film synthesized with this method showed improved crystallinity compared to the films without the growth promoter, leading to enhanced photodetector performance. The resulting photodetector array exhibited higher photoresponsivities over visible wavelengths than previously reported devices based on CVD-synthesized monolayer TMDs.
ADVANCED OPTICAL MATERIALS
(2022)
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
Chemistry, Multidisciplinary
Eunjin Kim, Ja-Yeon Kim, Min-Ki Kwon
Summary: In this study, a respiration sensor using MoS2-based resistance measurements was fabricated, and the cause of the slow response time for MoS2-based sensors was analyzed. The results show that the crystal phase change of MoS2 affects the absorption and desorption of H2O, and using the 2H structure can achieve high sensitivity, fast response time, and linear response to water vapor absorption during breathing. This study demonstrates the potential of two-dimensional nanomaterials for humidity and respiration sensors in various fields.
APPLIED SCIENCES-BASEL
(2023)
Review
Chemistry, Multidisciplinary
Wei Fu, Mark John, Thathsara D. Maddumapatabandi, Fabio Bussolotti, Yong Sean Yau, Ming Lin, Kuan Eng Johnson Goh
Summary: The manipulation of edge configurations and structures in atomically-thin transition metal dichalcogenides (TMDs) using chemical vapor deposition (CVD) has attracted much attention. These engineered TMD layers with diverse edge morphologies and configurations offer versatile candidates for various applications. This review provides an overview of the current state-of-the-art in CVD-based manipulation of TMD edges and edge-rich structures, highlighting the distinct properties and opportunities associated with these edge-functionalized crystals. The objective is to inspire further research and development efforts to harness the benefits of crystal-edge engineering using CVD.
Review
Chemistry, Physical
Huaning Jiang, Peng Zhang, Xingguo Wang, Yongji Gong
Summary: The development of magnetic 2D materials using CVD has attracted significant attention, as it offers a robust method for synthesizing ultrathin magnetic nanosheets with fascinating properties. Recent researches have focused on the fabrication methods and the manipulation of magnetic properties in 2D materials through heteroatoms doping and phase transition induced during CVD growth.
Article
Materials Science, Multidisciplinary
Menelaos Tsigkourakos, Maria Kainourgiaki, Evangelos Skotadis, Konstantinos P. Giannakopoulos, Dimitris Tsoukalas, Yannis S. Raptis
Summary: Molybdenum disulfide (MoS2) is of interest due to its semiconducting behavior, and chemical vapor deposition is a user-friendly technique with obstacles to growth. Researchers developed a method to grow large, monolayer MoS2 flakes on two substrates simultaneously, showing semiconducting behavior and two dominant conduction mechanisms based on temperature.
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
Materials Science, Multidisciplinary
Jing Wu, Rongnan Wang, Chao Wang, Hong Yan, Qing Han, Pengcheng Wang, Qi Chen, Jianmin Feng, Bo Zhang, Dejun Li, Yunzhou Xue, Birong Luo
Summary: Controlling the mutual structure between different materials in heterostructured composites is crucial for determining their properties and applications. This study successfully fabricated joint molybdenum disulfide nanosheets supported by vertically standing graphene using full chemical vapor deposition method. The resulting composite material showed improved hydrogen evolution reaction activities, highlighting the importance of the CVD loading mode for achieving better performance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mitsuhiro Okada, Jiang Pu, Yung-Chang Lin, Takahiko Endo, Naoya Okada, Wen-Hsin Chang, Anh Khoa Augustin Lu, Takeshi Nakanishi, Tetsuo Shimizu, Toshitaka Kubo, Yasumitsu Miyata, Kazu Suenaga, Taishi Takenobu, Takatoshi Yamada, Toshifumi Irisawa
Summary: The control of crystal polymorphism and exploration of metastable, two-dimensional, 1T' phase, transition-metal dichalcogenides (TMDs) have been the focus of research due to their potential applications in various fields. However, the high energy difference and phase change barrier between 1T' and 2H phases make it difficult to obtain monolayer 1T' phase TMDs. In this study, we successfully grew 1T' phase WS2 atomic layers using chemical vapor deposition (CVD) with alkali metal assistance. The resulting high-quality crystals showed superconductivity and hold promise for applications such as quantum computing and energy storage devices. The alkali metal assisted gas-source CVD growth method provides a viable approach to realizing large-scale, high-quality TMD atomic layers.
Article
Materials Science, Multidisciplinary
Zhiguo Du, Shuai Wang, Riming Hu, Di Zhang, Jianan Gu, Xiao Chen, Jiaxiang Shang, Bin Li, Shubin Yang, Lin Guo
Summary: By unlocking the catalytic activities of 2H phase molybdenum-based compounds through a topological conversion reaction from Mo2GeC MAX phase to accordion-like molybdenum phosphosulphide, the inert basal planes are optimized and water molecules are facilitated to be absorbed, resulting in high hydrogen production rates and ultralong durability for practical application in HER.
Article
Engineering, Manufacturing
Shah Kiat, Johnson Samuel
Summary: This study compares the wear mitigation efficacy of various two-dimensional materials as cutting fluid additives during diamond turning of steel. Graphene oxide showed the highest reduction in tool wear, followed by hexagonal boron nitride, tungsten disulfide, and molybdenum disulfide. X-ray Photo Spectroscopy measurements revealed the chemical interactions at the iron-diamond interface, offering potential for downstream applications.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Chemistry, Multidisciplinary
Ahrum Sohn, Changhyun Kim, Jae-Hwan Jung, Jung Hwa Kim, Kyung-Eun Byun, Yeonchoo Cho, Pin Zhao, Sang Won Kim, Minsu Seol, Zonghoon Lee, Sang-Woo Kim, Hyeon-Jin Shin
Summary: The phase-transition-induced growth (PTG) method successfully achieved the growth of one to eleven layers of MoS2 films on 2-inch wafers, with the ability to precisely control the number of layers and apply to heteroatom-inserted MoS2. Furthermore, analysis based on work functions revealed that the work function of MoS2 increases with the number of layers, with better electronic state modulation observed in thicker layers.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Haibin Sun, Xiao Kong, Hyoju Park, Fengning Liu, Zonghoon Lee, Feng Ding
Summary: This study reports the growth and formation mechanism of adlayer graphene spirals, and unravels the mechanism of graphene onion growth, providing a method for the controlled growth of few-layer graphene.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Da Luo, Myeonggi Choe, Rafael A. Bizao, Meihui Wang, Haisheng Su, Ming Huang, Sunghwan Jin, Yunqing Li, Minhyeok Kim, Nicola M. Pugno, Bin Ren, Zonghoon Lee, Rodney S. Ruoff
Summary: A single-crystal graphene film grown on a Cu(111) foil by chemical vapor deposition (CVD) exhibits ribbon-like fold structures, which provide insights into the fracture strength and compression behavior of graphene.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Bartosz Gurzeda, Tae In Kim, Madi Arsakay, Myeonggi Choe, Sun Hwa Lee, Zonghoon Lee, Seung Kyu Min, Rodney S. Ruoff
Summary: The researchers prepared a pure stage-1 graphite intercalation compound through electrochemical oxidation in trifluoroacetic acid, forming both covalent and ionic bonds between the acid and graphite layers. Electrochemical reduction led to the formation of stage-2 covalent GIC, with different interlayer spacings. Subsequent oxidation did not cause exfoliation, indicating high stability of GIC in air.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kangsik Kim, Seungwoo Son, Seonwoo Lee, Jong-Hyun Ahn, Zonghoon Lee
Summary: This research investigates the heteroepitaxial growth of 3C-SiC on Si nanomembrane using in situ heating transmission electron microscopy. The study demonstrates the growth of 3C-SiC at the preferential direction without defects, attributing it to the bowing effect at the nanoscale compensating for lattice misfit.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Yunqing Li, Myeonggi Choe, Sunghwan Jin, Da Luo, Pavel V. Bakharev, Won Kyung Seong, Feng Ding, Zonghoon Lee, Rodney S. Ruoff
Summary: The authors report the growth of micrometer-long single-crystal graphene ribbons with tapered or uniform width using silica particle seeds on single crystal Cu foils. The growth mechanism involves catalytic activation of ethylene and attachment of C atoms or species at the edges, as well as longitudinal growth driven by VLS mechanism.
Article
Multidisciplinary Sciences
Junhyeon Jo, Jung Hwa Kim, Choong H. Kim, Jaebyeong Lee, Daeseong Choe, Inseon Oh, Seunghyun Lee, Zonghoon Lee, Hosub Jin, Jung-Woo Yoo
Summary: This article presents a method to generate layer-by-layer defect gradients in a van der Waals material, inducing the Rashba effect by breaking spatial inversion symmetry. The effectiveness of the method is verified through experiments and theoretical calculations, paving the way for functional defect engineering in electronic applications.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jongchan Yoon, Younggeun Jang, Kangsik Kim, Jaemin Kim, Seungwoo Son, Zonghoon Lee
Summary: This study reports on the tensile and fracture behavior of monolithic ultra-thin amorphous carbon (a-C) films, revealing their large plastic strain and high strength. The plasticity is found to be associated with an increased nanoporosity and larger graphitic cluster size, which likely contributes to stiffening of the a-C film. Despite the large plastic strain, catastrophic failure still occurs.
Article
Chemistry, Multidisciplinary
Asir Intisar Khan, Xiangjin Wu, Christopher Perez, Byoungjun Won, Kangsik Kim, Pranav Ramesh, Heungdong Kwon, Maryann C. Tung, Zonghoon Lee, Il-Kwon Oh, Krishna Saraswat, Mehdi Asheghi, Kenneth E. Goodson, H. -S. Philip Wong, Eric Pop
Summary: This research reveals that reducing the SL period thickness (increasing the interface density) can decrease the reset switching current density and resistance drift coefficient, but interface intermixing within the SL can increase both values. By combining the characteristics of distinct and intermixed interfaces, further improvements can be made to the performance of superlattice phase change memory.
Article
Chemistry, Multidisciplinary
Gyu Hyun Jeong, Hye Soung Jang, Jong Chan Yoon, Zonghoon Lee, Jieun Yang, A-Rang Jang, Gyeong Hee Ryu
Summary: A surfactant-assisted method was used to synthesize Zn(OH)2 nanosheets, and the thickness and shape of the synthesized nanosheets were controlled by varying the surfactant concentration. The characteristics of oxygen evolution reaction using ZnO/Zn(OH)2 nanosheets as catalysts were also studied.
Article
Chemistry, Physical
Yujin Lee, Kangsik Kim, Zonghoon Lee, Hong-Sub Lee, Han-Bo-Ram Lee, Woo-Hee Kim, Il-Kwon Oh, Hyungjun Kim
Summary: In this study, Dy incorporation was used to stabilize HfO2 films and increase the grain size, which resulted in a reduction of leakage current density and an increase in breakdown strength. The properties of Dy-doped HfO2 thin films were characterized using various analysis techniques. The phase transformation of HfO2 films from different planes to a main m(-111) plane was observed through X-ray diffraction, indicating the role of Dy in stabilizing the film. The increase in grain size due to Dy incorporation was confirmed by electron microscopy.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jie Zhao, Asir Intisar Khan, Mikhail Y. Efremov, Zichao Ye, Xiangjin Wu, Kangsik Kim, Zonghoon Lee, H. -S. Philip Wong, Eric Pop, Leslie H. Allen
Summary: The phase transition of Sb2Te3/Ge2Sb2Te5 superlattices was studied using nanocalorimetry, providing insights into the thermodynamics of superlattice-based PCM and enabling low-power switching.
Article
Chemistry, Physical
Aram Yoon, Gyutae Kim, Minjeong Lee, Zonghoon Lee, Gyoeng Hee Ryu
Summary: In this study, the real-time behavior of phase transition during continuous heating of the sample was systematically analyzed using a scanning transmission electron microscope. The results suggest that different phases of transition metal oxides can be selectively implemented by controlling the temperature range.
NANOSCALE HORIZONS
(2022)
Article
Chemistry, Multidisciplinary
Siraj Sultan, Hojeong Lee, Sojung Park, Minho M. Kim, Aram Yoon, Hansaem Choi, Tae-Hoon Kong, Young-Jin Koe, Hyung-Suk Oh, Zonghoon Lee, Hyungjun Kim, Wooyul Kim, Youngkook Kwon
Summary: In this study, a newly designed electrocatalyst with phase and interphase engineering achieves high selectivity for the electrochemical reduction of carbon dioxide to ethylene. The catalyst shows good catalytic stability and material durability.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Hye Jin Cho, Dong Yeun Jeong, Hwihyun Moon, Taewoo Kim, You Kyoung Chung, Yeongdong Lee, Zonghoon Lee, Joonsuk Huh, Youngmin You, Changsik Song
Summary: Understanding the molecular arrangement of chiral supramolecular polymers is crucial for comprehending complex superstructures and developing next-generation optoelectronic materials. In this study, the researchers reported the first chiral supramolecular polymer systems based on hydrazone-pyridinium conjugates, which allowed control of supramolecular chirality. By controlling aggregation conditions and adding water, the researchers achieved helicity inversion and a different self-assembly behavior. The co-assembly of an achiral hydrazone luminophore with the supramolecular polymer system resulted in a novel CPL-active hydrazone-based material with high photoluminescence dissymmetry factor.