Article
Multidisciplinary Sciences
Ryota Okuda, Kazuhiko Niwano, Kaname Hatada, Kei Kokubu, Ryosuke Suga, Takeshi Watanabe, Shinji Koh
Summary: Graphene was applied to coplanar waveguide transmission lines in this study, and different types of graphene were tested and simulated. The results validated the transmission properties of graphene and provided parameters for improvement.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Analytical
Min-Ah Yoon, Chan Kim, Jae-Hyun Kim, Hak-Joo Lee, Kwang-Seop Kim
Summary: The surface properties of transferred graphene were investigated according to the transfer method (wet vs. dry). Wet transfer resulted in graphene with surface properties similar to the residue of poly(methyl methacrylate) after solvent etching, while dry transfer produced graphene with a surface closer to pristine graphene.
Article
Polymer Science
Sunghun Cho, Jun Seop Lee, Hyeji Jang, Seorin Park, Ji Hyun An, Jyongsik Jang
Summary: The study demonstrates a facile method of controlling the crystalline structures of polyketone films by combining plasma surface treatment with chemical vapor deposition (CVD) technique. The graphene sheets produced by CVD method play a crucial role in promoting the crystallization of beta-form polyketone and suppressing the growth of alpha-form polyketone crystals. Surface functionality of the CVD-grown graphene is found to be a significant factor in determining the crystalline structure of the polyketone.
Article
Nanoscience & Nanotechnology
Mrinal K. Sikdar, Bhabesh Sarangi, Pratap K. Sahoo
Summary: This study investigated the excitonic properties of highly crystalline ZnO hexagonal microdisks grown by chemical vapor deposition, indicating that a negative catalyst like chlorine can suppress crystal growth along the (0001) direction. A qualitative model was proposed to explain the layer-by-layer growth mechanism of the microdisks, with room temperature photoluminescence showing a high NBE emission peak and a minor defect peak. Low-temperature photoluminescence down to 83 K revealed surface exciton peaks in the NBE region and well-fitted higher-order phonon replicas.
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
Acoustics
Mateusz Kruszelnicki, Ahmad Hassanzadeh, Krzysztof Jan Legawiec, Izabela Polowczyk, Przemyslaw B. Kowalczuk
Summary: This study systematically investigated the role of ultrasound pre-treatment in the flotation of carbonaceous copper-bearing shale, and provided insights into the effects of ultrasound on particle surface charge and collector adsorption properties. The results showed that ultrasound pre-treatment had a positive effect on mass recovery, but excessive ultra-sonication diminished the recoverability of the sample.
ULTRASONICS SONOCHEMISTRY
(2022)
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, Physical
Xiaozhi Xu, Ruixi Qiao, Zhihua Liang, Zhihong Zhang, Ran Wang, Fankai Zeng, Guoliang Cui, Xiaowen Zhang, Dingxin Zou, Yi Guo, Can Liu, Ying Fu, Xu Zhou, Muhong Wu, Zhujun Wang, Yue Zhao, Enke Wang, Zhilie Tang, Dapeng Yu, Kaihui Liu
Summary: The latest semiconductor technology is based on the successful production of silicon ingots with extremely high purity levels, as well as the future high-end applications of graphene in electronics and optoelectronics. The research proposes a method to produce ultra-pure graphene grown on copper by eliminating both dot and point defects in graphene grains. This work paves the way for the production of intrinsically pure graphene, laying the foundation for large-scale graphene applications at the integrated-circuit level.
Article
Nanoscience & Nanotechnology
Chengxin Jiang, Lingxiu Chen, Huishan Wang, Chen Chen, Xiujun Wang, Ziqiang Kong, Yibo Wang, Haomin Wang, Xiaoming Xie
Summary: Graphene on hexagonal boron nitride (h-BN) demonstrates excellent electrical properties, which are affected by its domain size and boundaries. Chemical vapor deposition (CVD) is a hopeful method for large graphene crystal growth, but increasing the coverage of monolayer graphene on h-BN remains a challenge due to weak control of nucleation and vertical growth. In this study, an auxiliary source strategy using silicon carbide and methyl methacrylate is adopted to enhance graphene nucleation density and achieve continuous graphene films on h-BN. By optimizing the growth temperature, vertical accumulation of graphitic materials can be suppressed. This work provides an effective approach for preparing continuous graphene film on h-BN and offers insights for the growth of high-quality graphene.
Article
Chemistry, Physical
V Bayev, M. Rybin, I Svito, J. Przewoznik, Cz Kapusta, J. Kasiuk, S. Vorobyova, A. Konakov, E. Obraztsova
Summary: This paper discusses the charge transport in a sandwich-like structure composed of monolayer graphene, cobalt nanoparticles, and another layer of graphene. The top graphene layer plays a predominant role in charge transport, exhibiting increased carrier mobility and magnetoresistive effect compared to pristine graphene. This technology shows promise for potential optoelectronic and magneto-optical applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Zi Guo, Pengjiao Zu, Ze Liu, Muswelu Cecillia, Yuhao Cao, Jun Li, Jia Li
Summary: Adjusting parameters related to hydrogen and methane flow allows for the synthesis of high-quality single-layer graphene film on liquid copper, revealing the growth mechanism of adlayer graphene.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Chemistry, Physical
Hyungsub Lim, Hyo Chan Lee, Kilwon Cho
Summary: Graphene/Cu composites show promise as future electrode materials due to their mechanical, electrical, and thermal stability. However, the presence of graphene accelerates oxidation of the underlying Cu surface, which affects the properties of the composites. Therefore, it is critical to investigate the effects of Cu oxidation on the interfacial properties of graphene/Cu composites.
Article
Materials Science, Multidisciplinary
Zi Guo, Chengda Li, Pengjiao Zu, Ze Liu, Jun Li, Jia Li
Summary: In this study, crack defects of graphene grown on liquid copper substrates by chemical vapor deposition (CVD) were examined, and the effects of growth temperature, growth time, and total pressure on crack kinetics were analyzed. A dynamic mechanism of crack growth was proposed.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Pavel Pivovarov, Alexey Popovich, Vladimir Cheverikin, Alexey Romshin, Maxim Rybin, Elena Obraztsova
Summary: In this paper, we propose a method to synthesize graphene on epitaxial single-crystal Cu film deposited and recrystallized on a basal-plane sapphire substrate. The optimized conditions result in single-crystal graphene growth over the entire area of copper grains with (111) orientation and record size. The high quality of synthesized graphene is confirmed by Raman spectroscopy, scanning electron microscopy, and sheet resistance measurements.
Article
Physics, Applied
Yalan Wang, Miao Zhang, Panlin Li, Xinqian Chen, Zhongying Xue, Xing Wu, Zengfeng Di
Summary: This study reveals the formation mechanism and microstructure of grain boundaries in graphene grown on different Ge substrates. It is found that a grain boundary-free single crystalline graphene film can be obtained on the Ge (110) substrate, while polycrystalline graphene films with grain boundaries are grown on the Ge (001) and Ge (111) substrates.
APPLIED PHYSICS LETTERS
(2022)
