Article
Multidisciplinary Sciences
Meihui Wang, Ming Huang, Da Luo, Yunqing Li, Myeonggi Choe, Won Kyung Seong, Minhyeok Kim, Sunghwan Jin, Mengran Wang, Shahana Chatterjee, Youngwoo Kwon, Zonghoon Lee, Rodney S. Ruoff
Summary: Restricting the initial growth temperatures used for chemical vapour deposition of graphene on metal foils produces optimum conditions for growing large areas of fold-free, single-crystal graphene, which exhibit highly uniform transport properties.
Article
Chemistry, Physical
Robert M. Jacobberger, Donald E. Savage, Xiaoqi Zheng, Pornsatit Sookchoo, Richard Rojas Delgado, Max G. Lagally, Michael S. Arnold
Summary: This study investigates the effects of Ge surface orientation on graphene island formation, strain in large-area graphene films, and nanofaceting of Ge below graphene. The results show that the growth morphology and properties of graphene vary on different Ge surface orientations, but graphene exhibits a certain degree of strain regardless of the orientation.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Tuan Khanh Chau, Dongseok Suh, Haeyong Kang
Summary: This study investigates the influence of individual grain boundaries (GBs) on the quantum Hall effect (QHE) in monolayer chemical vapor deposition (CVD) graphene. It finds that the scattering of GBs only affects the longitudinal resistance (R-xx) in the low carrier concentration region, while the standard QHE of monolayer graphene can be observed regardless of the stitching angle of the GB. Additionally, a controlled device with an added metal bar is introduced, showing that only R-xx is affected by nonzero resistance, while the Hall resistance (R-xy) exhibits well-quantized plateaus in the QH state.
Article
Chemistry, Multidisciplinary
Su Han Kim, Shiru Jiang, Sang-Shin Lee
Summary: Three-dimensional (3D) graphene is successfully grown on a patterned sapphire substrate (PSS) using metal-catalyst-assisted chemical vapor deposition. However, transferring the 3D graphene film without compromising its integrity is challenging due to the low etching rate of PSS. To address this issue, a transfer-support layer (TSL) is coated on PSS before the growth of 3D graphene. The TSL allows for easy and high-quality transfer of the 3D graphene onto a flexible substrate.
Article
Chemistry, Physical
Hongwei Liu, Ruizhe Wu, Md Delowar Hossain, Xuyun Guo, Jie Pan, Runlai Li, Irfan Haider Abidi, Zhenjing Liu, Ye Zhu, Zhengtang Luo, Yao Ding
Summary: Space-confined growth chamber, tellurium vapor assisted growth, and PMMA residues as carbon source were utilized in the project to achieve high-quality large-area graphene growth at low temperature.
Article
Nanoscience & Nanotechnology
Yuki Ueda, Takahiro Maruyama, Shigeya Naritsuka
Summary: The graphene island density decreased while the growth rate increased with the increase of growth pressure. The catalytic effect of the a-plane sapphire surface facilitated the successful growth of high-quality and highly uniform single-layer graphene.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Myungwoo Choi, Jinwook Baek, Huije Ryu, Hyejeong Lee, Jicheol Byen, Seong-Gu Hong, Bum Jun Kim, Sooheon Cho, Jae Yong Song, Gwan-Hyoung Lee, Hosun Shin, Jae-Young Choi, Seokwoo Jeon
Summary: Efforts have been made to grow single-crystal graphene in recent years, but issues such as nanoscale defects control and substrate-dependent nonuniformity remain unresolved. This study demonstrates a possible route to grow single-crystal graphene by combining aligned nucleation and sequential heat treatment. The resulting single-crystallike graphene exhibits high thermal conductivity and carrier mobility.
Article
Chemistry, Multidisciplinary
Yanglizhi Li, Haiyang Liu, Zhenghua Chang, Haoxiang Li, Shenxing Wang, Li Lin, Hailin Peng, Yujie Wei, Luzhao Sun, Zhongfan Liu
Summary: By using the slip-line-guided growth principle, the controllable crystal orientation of graphene on metal surfaces has been demonstrated, leading to the successful synthesis of bicrystal graphene with specific GB misorientations on metal substrates.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Xue Zhang, Xing Guo, Peng Wang, Li Sun, Linyu Bai, Yanlu Li, Fapeng Yu, Xian Zhao
Summary: This study investigates the main factors influencing the formation of Cu step beams (CSBs) during graphene growth by chemical vapor deposition (CVD). It was found that copper crystal orientation, number of graphene layers, and surface undulation of the Cu foil affect the morphology of CSBs. Higher-index surfaces of Cu foils tend to form distinct CSBs with increased roughness. Bilayer and trilayer graphene cause deeper and wider CSBs compared to single-layer graphene.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Junzhu Li, Abdus Samad, Udo Schwingenschlogl, Bo Tian, Mario Lanza, Xixiang Zhang
Summary: In this study, a nonlinear carbon supply growth strategy is proposed for the controllable growth of specific-sized hexagonal graphene islands on copper substrates. Large-area graphene films with desired densities, sizes, and distances between islands are successfully synthesized, and the direct growth of graphene-based nanodevices is achieved based on these islands.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hao-Ting Chin, Hai-Thai Nguyen, Szu-Hua Chen, Yi-Fang Chen, Wei-Hung Chen, Zhi-Yang Chou, Yi-Hung Chu, Zhi-Long Yen, Chu-Chi Ting, Mario Hofmann, Ya-Ping Hsieh
Summary: By optimizing the interaction between precursor and substrate, reaction-controlled growth of 2D materials can be achieved, leading to increased growth efficiency and speed. This new approach significantly improves the growth rate of graphene by orders of magnitude, allowing for synthesis even in atomic-scale pores.
Article
Chemistry, Multidisciplinary
Honghwi Park, Junyeong Lee, Chang-Ju Lee, Jaewoon Kang, Jiyeong Yun, Hyowoong Noh, Minsu Park, Jonghyung Lee, Youngjin Park, Jonghoo Park, Muhan Choi, Sunghwan Lee, Hongsik Park
Summary: This study developed an electrical characterization method that can extract the average grain size, single-crystalline grain sheet resistance, and grain boundary resistivity of polycrystalline graphene. By analyzing the cumulative distribution function of graphene, it was discovered that the sheet resistance of graphene could be influenced by the device dimension. This model was successfully applied to chemical vapor deposition-grown graphene and accurately determined its important parameters.
Article
Materials Science, Ceramics
Xuchao Wang, Jun Zhao, Enzhao Cui, Zhefei Sun, Hao Yu
Summary: This study investigated the grain growth kinetics and grain refinement mechanism of Al2O3 and WC grains in Al2O3/WC/TiC/graphene ceramic composite, revealing different grain growth mechanisms influenced by the wettability of graphene. Analysis of grain growth activation energy showed that the grain growth of Al2O3 and WC went through three stages. The grain refinement of Al2O3 grains was attributed to graphene pinning effect and intragranular structure, while the grain refinement of WC grains was due to the strong bonding interface between WC and graphene.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Ke Yang, Teng An, Jinglong Qu, Jinhui Du, Hailong Qin, Shuqi Zheng, Zhongnan Bi
Summary: The study focused on the effects of cooling rate during solution heat treatment on the evolution of grain boundaries and gamma' precipitates in GH4710 alloy. Results showed that a decrease in cooling rate led to a transition from straight to serrated grain boundaries, while also improving the tensile properties and stress-rupture performance of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Chemistry, Physical
Bozhong Zhuang, Shiyun Li, Siyang Li, Jun Yin
Summary: This review summarizes current methods to reduce PMMA residues and systematically discusses the mechanisms behind them.
Article
Chemistry, Physical
Hang Chen, Jingguo Li, Wooseok Yang, S. Esmael Balaghi, C. A. Triana, Christos K. Mavrokefalos, Greta R. Patzke
Summary: Efficient transfer of photogenerated carriers and improved stability against corrosion are crucial for maximizing the performance of photoanodes. In this study, a reduced catalytic layer formed on a TiO2 protected BiVO4 photoanode has been shown to enhance photogenerated carrier transfer efficiency and stability. The results indicate that the photoanodes displayed high photocurrent and more negative onset potential at pH 8, highlighting the importance of surface property tuning for optimal photoelectrochemical performance.
Article
Electrochemistry
SungHoon Jung, Pham Thi Huong, Shalini Sahani, Kumud Malika Tripathi, Byung Jun Park, Young Hee Han, TaeYoung Kim
Summary: A facile method is reported to produce composites of hierarchically porous graphene-based materials embedded with onion-like carbons (Gr-OLCs) for high power density supercapacitors. The carbon material showed high specific capacitance and power density, making it a promising electrode material for high power energy storage devices.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Yong-il Ko, Min Jae Kim, Dong Yun Lee, Jungtae Nam, Keun Soo Kim, A-Rang Jang
Summary: This study utilized a laser-assisted chemical vapor deposition system to fabricate laser-scribed carbon nanomaterials for flexible gas sensor applications, reducing cost and process time while maintaining material flexibility.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2022)
Article
Chemistry, Physical
Wonki Lee, Jungtae Nam, Jaejun Park, Geonhee Lee, Seok hoon Ahn, Keun Soo Kim, Jeong-O Lee, Chel-Jong Choi, Jun Yeon Hwang
Summary: This study presents an efficient method for dispersing and reducing the defects of graphene oxide (GO) through a pulsed wire discharge (PWD) process in an organic solvent. The results show that copper wire and carbon fiber can effectively control the electric explosion process, resulting in GO with low oxygen content and excellent electrical conductivity.
Article
Chemistry, Multidisciplinary
Subin Moon, Jaemin Park, Hyungsoo Lee, Jin Wook Yang, Juwon Yun, Young Sun Park, Jeongyoub Lee, Hayoung Im, Ho Won Jang, Wooseok Yang, Jooho Moon
Summary: In order to achieve practical solar hydrogen production, a low-cost photocathode with high photocurrent density and onset potential is needed. In this study, an efficient and stable overall photoelectrochemical tandem cell is developed with a Cu3BiS3-based photocathode. The preparation of a Bi2S3-Cu3BiS3 blended interlayer using a one-step solution process with two sulfur sources is found to enhance the performance of the Cu3BiS3 thin-film photocathode. The resulting solar-to-hydrogen efficiency is 2.33% with excellent stability exceeding 21 hours.
Article
Chemistry, Multidisciplinary
Shalini Sahani, Seung Jun Park, Yusik Myung, Thi-Huong Pham, Tran Thanh Tung, TaeYoung Kim
Summary: A novel room-temperature gas sensor composed of polymeric graphitic carbon nitride composite was developed and used for the detection of ethanol vapor under ambient conditions. The sensor exhibited excellent sensing efficiency, high selectivity, and stability, with a swift response time provided under ambient conditions.
Review
Nanoscience & Nanotechnology
Bhaskar Bhaduri, Ashutosh Kumar Dikshit, TaeYoung Kim, Kumud Malika Tripathi
Summary: Spinel ferrite nanostructures have promising magnetic properties, high resistivity, stability, and low eddy current losses. Their utilization in water remediation and catalysis applications shows great potential for practical applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Nasir Sarwar, Muhammad Shahzad Zafar, Usama Bin Humayoun, Suhyeon Kim, Syed Waqas Ahmad, Yong Ho Kim, Dae Ho Yoon
Summary: This study presents an unprecedented chemical-free green synthesis of bioactive Ag-NPs using cinnamon essential oil (ECO) as a bio-reducing agent with and without lime extract mediation. The incorporation of lime extract into the reaction medium resulted in rapid reaction completion and better shape and size control. The interaction of natural metabolites and citrus compounds with nanoparticles was confirmed using FTIR and Raman spectroscopy. The fabric treated with lime-mediated nanoparticles showed improved easy-care performance without significant loss in fabric strength.
Article
Chemistry, Physical
Jeiwan Tan, Xi Zhang, Jihye Suh, Neul Ha, Jaewook Lee, S. David Tilley, Wooseok Yang
Summary: The use of solution processing for metal chalcogenide thin films has gained interest due to its low cost and scalability. This review summarizes studies on three types of molecular ink systems and their application in solar energy conversion. The unique chemistry and characterization techniques of each system are presented, and future advancements in molecular ink-derived chalcogenide thin films are discussed.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Physical
Jungyoon Cho, Soyeong Kwon, Jungtae Nam, Seawoo Moon, Jungeun Song, Seoyoung Lim, Eunseo Cho, Hyeong-Ho Park, Keun Soo Kim, Dong-Wook Kim
Summary: The integration of metal nanostructures and graphene has significant implications for optoelectronic device applications. In this study, heterojunctions of graphene and gold nanopillar arrays were fabricated, and their photocurrent characteristics were investigated, revealing the light-matter interaction mechanism between them.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Biochemistry & Molecular Biology
Usama Bin Humayoun, Fazal Mehmood, Yasir Hassan, Aamir Rasheed, Ghulam Dastgeer, Asad Anwar, Nasir Sarwar, Daeho Yoon
Summary: This study successfully immobilized zinc oxide and carbon nanotubes onto a textile substrate, creating an efficient immobilized photocatalyst for degrading commercial textile colorants. The integration of zinc oxide, carbon nanotubes, and chitosan in the fabric significantly improved the photocatalytic performance.
Article
Chemistry, Multidisciplinary
Byungwook Ahn, Yoonsok Kim, Meeree Kim, Hyang Mi Yu, Jaehun Ahn, Eunji Sim, Hyunjin Ji, Hamza Zad Gul, Keun Soo Kim, Kyuwook Ihm, Hyoyoung Lee, Eun Kyu Kim, Seong Chu Lim
Summary: Transition metal dichalcogenides (TMDs) have unique electrical properties, but their performance is affected by defect sites. This study introduces a single treatment method to remove defects in multilayer MoS2 FET, resulting in enhanced carrier mobility.
Article
Chemistry, Physical
Pardis Adams, Fabrizio Creazzo, Thomas Moehl, Rowena Crockett, Peng Zeng, Zbynek Novotny, Sandra Luber, Wooseok Yang, S. David Tilley
Summary: This study explores simple and low-temperature treatments of Sb2Se3/TiO2-based photocathodes to address the photovoltage deficit challenge. Treatments with (NH4)(2)S and CuCl2 significantly increased the photocurrent and onset potential, while modifying the surface defects. These low-cost treatments enhance the practical potential of Sb2Se3 for large-scale water splitting.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Dong Young Kim, Geonhee Lee, Gil Yong Lee, Jungpil Kim, Kwangu Jeon, Keun Soo Kim
Summary: This study developed a flexible nanocomposite based on polydimethylsiloxane (PDMS), incorporating highly conductive carbon nanotubes and reduced graphene oxide, for high-performance wearable electrocardiogram (ECG) electrodes. The optimized nanocomposite demonstrated uniform surface characteristics and low contact resistance, making it a promising material for expanding the application scope of wearable electronic devices and personal health monitoring systems.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Wenzhe Niu, Thomas Moehl, Pardis Adams, Xi Zhang, Robin Lefevre, Aluizio M. Cruz, Peng Zeng, Karsten Kunze, Wooseok Yang, S. David Tilley
Summary: Ammonia solution etching of cuprous oxide photocathode devices results in enhanced photoelectrochemical performance and improved reproducibility. The etching process also leads to diverse morphologies of Cu2O crystals based on different crystallographic orientations. Metallic copper traps are found to limit the photoelectrochemical performance.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)