Article
Chemistry, Physical
Patrick J. Edwards, Sean Stuart, James T. Farmer, Ran Shi, Run Long, Oleg V. Prezhdo, Vitaly V. Kresin
Summary: Nanostructured electronic devices, like graphene-based ones, can be fully metallized while the insulating substrate remains coverage-free when exposed to small size-selected silver nanoparticles. This effect is due to the low binding energy between metal nanoparticles and a contaminant-free passivated silica surface. It provides insight into nanoparticle adhesion and has practical applications in deposition of metallic layers on device working surfaces, eliminating the need for masking and extensive pre- and post-processing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Mengying Li, Pinggen Zou, Zhi Chen, Ruotong Zhao, Cao Tang, Shuai Wang, Yanqing Ma, Lei Ma
Summary: The direct growth of graphene on an insulator is important for various applications, but synthesizing large area, homogeneous monolayer graphene with high quality remains a challenge. In this work, a full monolayer wafer-scale graphene film was successfully realized on a silicon/silicon oxide substrate. The synthesized graphene showed high quality and exhibited excellent properties.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Ruojuan Liu, Zhe Peng, Xiaoli Sun, Zhaolong Chen, Zhi Li, Haina Ci, Bingzhi Liu, Yi Cheng, Bei Jiang, Junxiong Hu, Wanjian Yin, Jingyu Sun, Zhongfan Liu
Summary: In this study, the critical roles of CO2 promotors in the direct growth of graphene are identified, which can decrease graphene nucleation density, improve growth kinetics, and mitigate adlayer formation. The generation of gas-phase OH species in CO2-assisted system helps decrease the energy barriers of CH4 decomposition and carbon attachment to the growth front, enabling high-quality direct growth. The CO2-promoted strategy allows the conformal coating of graphene film over curved insulators, showing potential in various applications.
Article
Nanoscience & Nanotechnology
Fengsong Qian, Jun Deng, Yibo Dong, Chen Xu, Liangchen Hu, Guosheng Fu, Pengying Chang, Yiyang Xie, Jie Sun
Summary: This study introduces a method for growing high-quality large-area graphene at low temperatures. By controlling the chamber pressure and hydrogen content, a uniform graphene film is successfully obtained. Additionally, a transfer-free growth technique is proposed, demonstrating a graphene transistor array with good performance consistency.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Bingzhi Liu, Zhongti Sun, Kejian Cui, Zaikun Xue, Zhi Li, Wen Wang, Wei Gu, Kaiqiang Zheng, Ruojuan Liu, Yu Zhao, Mark H. Rummeli, Xuan Gao, Jingyu Sun, Zhongfan Liu
Summary: Direct synthesis of large-area graphene on functional substrates via chemical vapor deposition has been achieved in a batch manner. A nano-scale compartment is designed to allow free molecular flow during growth and trap hydroxyl species released from the quartz substrates, which facilitates graphene growth. The resulting graphene exhibits excellent optical transmittance and electrical properties. These findings open up new possibilities for batch production of graphene-skinned functional materials with practical scalability and quality.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jing Jin, Michelle Wurch, Saba Baraghani, Daniel J. Coyle, Thomas A. Empante, Fariborz Kargar, Alexander A. Balandin, Ludwig Bartels
Summary: This study presents the growth of quasi-one-dimensional zirconium tritelluride using CVD technique at low temperatures and short processing times. The material shows comparable electrical conductivity to bulk and exhibits a positive temperature coefficient. Various characterization techniques were employed to validate the composition and electrical properties of the material.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Unhyeon Kang, Eunbi Jeong, Soeun Ahn, Kyoung Ho Jeon, Sang Ho Lim, Seunghee Han
Summary: This study presents a new method for growing graphene thin films directly on substrates using a plasma electron annealing process. The method offers advantages such as simplicity, cleanliness, and low temperature processing, which could open up new possibilities for future graphene research.
Article
Chemistry, Physical
YouJin Min, Oleksiy Penkov, Mahdi Khadem, Dae-Eun Kim
Summary: It has been found that the hardness of the substrate coating significantly affects the tribological performance of graphene films and the formation of an effective lubricating transfer film. Under certain hardness conditions, graphene can significantly reduce the friction coefficient and wear rate.
Article
Chemistry, Multidisciplinary
Bing Liu, Peng Xiao, Chaohui Liu, Jiamin Li, Yingjie Cao, Siguang Ma
Summary: The direct growth of high-quality large graphene crystals with hexagonal shape on the SiO2/Si substrate at low temperatures by PECVD is significant for its electronic and optoelectronic applications. This work successfully reduces the total nucleation density and suppresses subsequent multiple nucleation, ensuring a low total nucleation density all the time during growth and facilitating the successful growth of large graphene crystals. This work will promote the study of low-temperature growth techniques of graphene on dielectric substrates, as well as the large-scale applications of graphene.
Article
Chemistry, Physical
Sergey Pavlov, Yekaterina O. Kozhevnikova, Vitaliy A. Kislenko, Sergey A. Kislenko
Summary: This study investigated the influence of metal type on nonadiabatic electron transfer on metal-supported graphene using DFT calculations. It was found that the electrocatalytic effect varies depending on the metal, with Pt showing the highest enhancement in the electron transfer.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Sivasakthya Mohan, Dmitry Kireev, Shanmukh Kutagulla, Nicholas Ignacio, Yuqian Gu, Hugo Celio, Xun Zhan, Deji Akinwande, Kenneth M. Liechti
Summary: This study explores the direct growth of metal-catalyst-free graphene on sapphire substrates at conventional metal CVD temperatures. Annealing the substrate prior to growth improves the quality of graphene, resulting in uniformly bilayer graphene. The interaction strength between graphene and sapphire is higher, suggesting potential electronic applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Optics
Mehran Habibzadeh, Hua Lin, Sheila Edalatpour
Summary: Graphene is a promising material for near-field radiative heat transfer due to its large heat flux values and the capability to control the heat flux with a bias voltage. However, the presence of a substrate affects the heat transfer coefficient and modulation ratio. This study investigates the effect of substrates on the heat flux and modulation ratio between two graphene sheets, showing that the presence of a substrate reduces both the heat flux and modulation ratio. Dielectric substrates such as BaF2, KCl, NaF, RbCl, and RbBr have the largest modulation ratio and heat flux among the selected substrates.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Chemistry, Inorganic & Nuclear
Xinzhe Shi, Sihan Li, Anke Spannenberg, Fabian Reiss, Torsten Beweries
Summary: The study of new structures and reactivity patterns in organic and organometallic chemistry is of great interest. Metallacycles of electropositive transition metals provide an excellent platform for this purpose. In this work, a set of ring-strained group 4 ansa-metallocene-based 1-metallacyclobuta-2,3-dienes were synthesized and their reactivity towards carbodiimides was studied. The results showed that the biradical character of these species depends on the metal as well as the nature of the cyclopentadienyl ligands.
INORGANIC CHEMISTRY FRONTIERS
(2023)
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
Multidisciplinary Sciences
Jingyuan Shan, Sunmiao Fang, Wendong Wang, Wen Zhao, Rui Zhang, Bingzhi Liu, Li Lin, Bei Jiang, Haina Ci, Ruojuan Liu, Wen Wang, Xiaoqin Yang, Wenyue Guo, Mark H. Rummeli, Wanlin Guo, Jingyu Sun, Zhongfan Liu
Summary: This paper reports an effective approach utilizing a metal-containing species, copper acetate, for transfer-free growth of high-quality graphene on a wafer scale. The derived graphene films exhibit reduced multilayer density, improved electrical performance, and demonstrate robust voltage output and long cyclic stability in droplet-based hydrovoltaic electricity generator devices.
NATIONAL SCIENCE REVIEW
(2022)
Article
Materials Science, Multidisciplinary
Noor Ayuma Mat Tahir, Shahira Liza, Kanao Fukuda, Syazwani Mohamad, Mohd Zakir Fathi Hashimi, Mohd Saifulnizam Mohd Yunus, Yazid Yaakob, Intan Sharhida Othman
Summary: Hard anodizing is a beneficial surface treatment for aluminum alloy, accompanied by the growth of a porous and flawed oxide layer. This study focused on reinforcing fly-ash on the oxide coating and investigating its tribological performance. The findings suggest that composite oxide coatings have the potential to reduce wear rate, despite the limited time period in which friction is reduced.
Article
Materials Science, Multidisciplinary
Golap Kalita, Balaram Paudel Jaisi, Masayoshi Umeno
Summary: In this study, a novel microwave-excited surface-wave plasma process was demonstrated to reduce insulating graphene oxide to highly conducting reduced graphene oxide on flexible substrates, as well as achieving reduction of freestanding graphene oxide paper.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Physics, Condensed Matter
Hisashi Sato, Yuya Ito, Golap Kalita, Yoshimi Watanabe
Summary: The crystallographic texture of pure Cu can be modified by shot peening, resulting in the formation of a {110} fiber texture. Moreover, using shot-peened specimens with {110} fiber texture improves the growth of high-quality graphene on their surfaces. Therefore, controlling the crystallographic texture by shot peening is of great importance for preparing high-quality graphene and other catalytic substrate surfaces.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Polymer Science
Nur Hidayah Shahemi, Shahira Liza, Yoshinori Sawae, Takehiro Morita, Hironori Shinmori, Yazid Yaakob
Summary: Recent studies have shown that the wear of UHMWPE increases significantly in the presence of proteins, and adding graphite and graphene oxide (GO) can improve its wear properties. The wear resistance improvement is primarily attributed to the addition of GO filler, which enhances subsurface strength and heat dissipation, ultimately reducing protein denaturation.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Bhagyashri Todankar, Yazid Yaakob, Golap Kalita, Masaki Tanemura
Summary: Urea oxidation reaction (UOR) catalysts have been extensively studied due to their affordability, ease of storage and shipment, as well as their non-toxic and non-combustible characteristics. In this study, nitrogen doped carbon nanofibers (CNFs) grown on nichrome foil were investigated as a potential catalyst for urea fuel cells. The CNFs exhibited significant urea oxidation reaction in various molar concentrations of urea, making them a promising candidate for urea oxidation.
Article
Chemistry, Multidisciplinary
Venkata Krishna Rao Rama, Ajinkya K. Ranade, Pradeep Desai, Bhagyashri Todankar, Golap Kalita, Hiroo Suzuki, Masaki Tanemura, Yasuhiko Hayashi
Summary: We investigated the device properties of a nickel-gallium oxide Schottky junction with an interfacial hexagonal boron nitride layer. The addition of the hBN layer significantly enhanced the turn-on voltage for forward current and improved the photoresponsivity under deep ultraviolet light illumination. The hBN interfacial layer can serve as a barrier layer to control the turn-on voltage and optimize the device properties for deep-UV photosensor applications.
Article
Chemistry, Multidisciplinary
Zhi Wei Loh, Mohd Hafiz Mohd Zaid, Mohd Mustafa Awang Kechik, Yap Wing Fen, Yazid Yaakob, Mohd Zul Hilmi Mayzan, Shahira Liza, Wei Mun Cheong
Summary: This paper outlines the fabrication of bioactive glass derived from waste eggshells as a source of calcium and investigates its properties. The results show that increasing CaF2 content with appropriate P2O5 content can improve the mechanical properties of the bioglass. The bioglass with CaF2/P2O5 ratio of 6/4 exhibits the optimal compressive strength and vickers microhardness.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Faysal Selimoglu, Bahri Gur, Muhammed Emre Ayhan, Fatma Gur, Golap Kalita, Masaki Tanemura, Mehmet Hakki Alma
Summary: Procalcitonin(PCT) is a highly sensitive biomarker for severe inflammation and infection in the early detection of sepsis. The interaction between electrode material and attached material is important. A silver nanoparticle (AgNp) doped graphene-based sensitive PCT biosensor with low-cost, environmentally friendly materials is presented here. The biosensor exhibits reusability, adhesion of antibody-protein, and a detection limit of 0.55 ng/mL.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Nur Aszreen Zulkifli, Shahira Liza, Hiroki Akasaka, Kanao Fukuda, Nur Adilah Mohd Rawian, Nur Afieqah Md Ghazazi, Noor Ayuma Mat Tahir, Yazid Yaakob
Summary: Using pulse current and DLC flakes can improve the surface quality and durability of hard anodizing. Increasing the DLC content enhances the hardness and wear resistance of the oxide film, while using 5 g/L DLC in the electrolyte reduces friction.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Balaram Paudel Jaisi, Rucheng Zhu, Golap Kalita, Masayoshi Umeno
Summary: The growth of carbon thin films on insulating substrates with nitrogen doping at various temperatures was investigated using microwave-excited surface wave plasma chemical vapor deposition technique. Partially graphitized carbon thin films were obtained at a low temperature of 150 degrees C on quartz substrates. The addition of nitrogen reduced the granular morphology and formed planar structures, revealing the significance of nitrogen incorporation in controlling the morphology of carbon films.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Ayman Abuallan, Mohd Hafiz Mohd Zaid, Khamirul Amin Matori, Yazid Yaakob, Abdul Rahman Sarmani, Wei Mun Cheong, Zhi Wei Loh
Summary: This study investigated the effect of neodymium oxide modification on the elastic, structural, and physical properties of magnesium borotellurite glasses. Increasing the concentration of Nd2O3 resulted in an increase in the density of the bulk samples from 3.97 g/cm3 to 4.10 g/cm3, while the molar volume showed the opposite trend. X-ray diffraction analysis confirmed the amorphous state of the glasses, and the elastic moduli exhibited a linear increase with the increment of Nd2O3. The elastic moduli calculated using the Makishima-Mackenzie and Rocherulle's models followed the same trend as the experimental values. The results indicated that the MBTNd-3 glass sample had the optimum properties for high-strength glass applications.
MATERIALS TODAY COMMUNICATIONS
(2023)
Review
Chemistry, Physical
Golap Kalita, Takashi Endo, Toshihiko Nishi
Summary: This paper reviews the synthesis methods of oxide-based solid-state electrolytes (SSEs), focusing on the low temperature synthesis of cubic-phase LLZO particles and the challenges in achieving high relative density with excellent ionic conductivity. The future prospects of applying these ultrafine particles in all-solid-state batteries are also discussed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
K. F. Chan, N. A. M. Maznam, M. A. Hazan, R. N. A. Ahmad, A. S. Sa'ari, N. F. I. Azman, M. S. Mamat, M. A. . A. . Rahman, M. Tanemura, Y. Yaakob
Summary: In this study, multi-walled carbon nanotubes (MWCNTs) were successfully grown on nickel oxide (NiO) via chemical vapour deposition (CVD), and the influence of catalyst particle size and precursor flowing path on the growth of MWCNTs was investigated. The results showed that increasing NiO milling time and choosing an appropriate D value can improve the crystallite size and carbon yield of MWCNTs.
Article
Materials Science, Multidisciplinary
K. F. Chan, A. K. Ranade, P. Desai, M. A. Hazan, N. F. I. Azman, S. Shaharifin, G. Kalita, M. S. Mamat, M. Tanemura, Y. Yaakob
Summary: Carbon nanomaterials have significant applications in various fields, and green synthesis of these materials using low-cost and energy-efficient methods is of great interest. In this study, carbon nanotubes and graphitic carbon layers were synthesized using barbeque grease as the carbon precursor via chemical vapour deposition technique. The research aimed to explore novel and affordable carbon precursors for high-quality carbon nanomaterial production.
Article
Chemistry, Multidisciplinary
Tatsuya Akiyama, Shuhei Nakanishi, Yazid Yaakob, Bhagyashri Todankar, Vikaskumar Pradeepkumar Gupta, Toru Asaka, Yosuke Ishii, Shinji Kawasaki, Masaki Tanemura
Summary: This study proposes a simple process for the room temperature fabrication of pseudocapacitor electrodes with an enhanced surface area and excellent faradaic redox reaction layer. A carbon layer containing fine Ni nanoparticles dispersed on a metallic electrode was successfully prepared through ion irradiation and local graphitization. The fabricated electrode showed a significantly increased stored charge ability compared to the bulk Ni foil. The results suggest that the carbon layer with Ni nanoparticles fabricated by ion irradiation has great potential for the development of supercapacitors.
