Article
Chemistry, Multidisciplinary
Jianpeng Liu, Wenchang Zhang, Chang Cheng, Juncheng Zhu, Tianle Wang, Kun Ni, Zifeng Lin, Zefeng Guan, Yanwu Zhu, Jiliang Zhu
Summary: This study presents a rapid reduction method for graphene oxide (GO) by bringing GO foam into contact with semi-molten metals such as tin (Sn) and lithium (Li). The electrical resistance of GO foam is significantly reduced by its interaction with these metals, even in dry air. By employing tin foil and calcination, the rGO with remarkably lower electrical resistivity is fabricated, demonstrating its potential as an electrode material for lithium-sulfur batteries.
Article
Energy & Fuels
Chau Van Tran, Mahima Khandelwal, Jungbae Lee, Anh Phan Nguyen, Jung Bin In
Summary: This study proposes a controlled self-propagating reduction of GO films by adjusting the base temperature within low values, demonstrating competitive performance and cycling stability of rGO films as supercapacitor electrodes. The research opens a new avenue for producing high-quality rGO at minimal energy cost using the self-propagating reduction of GO films.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Sabrin Al-Fogra, Bowen Yang, Lisa Jurkiewicz, Frank Hauke, Andreas Hirsch, Tao Wei
Summary: This study presents a facile and universal laser writing approach for covalent patterning of graphene, leading to the formation of graphene architectures consisting of antaratopically functionalized superlattices, which were previously elusive.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yanhui Zheng, Xifeng Hou, Siqi Lv, Zichuan Ma, Xiaolong Ma
Summary: In this study, beta-cyclodextrin-modified reduced graphene oxide aerogels (beta-CD-rGOAs) were synthesized and used to remove hexamethyldisiloxane from biogas. Characterizations showed that beta-CD was grafted onto the surface of rGOAs as a cross-linking modifier, forming a three-dimensional, cross-linked porous structure. The maximum breakthrough adsorption capacity of L2 on beta-CD-rGOA was 111.8 mg g(-1) at 273 K, and the material could be regenerated by annealing at 80 degrees C, making it promising for L2 removal from biogas.
Article
Engineering, Environmental
Md Osim Aquatar, Juili S. Mankar, Urvashi Bhatia, Sadhana S. Rayalu, Reddithota J. Krupadam
Summary: Highly efficient CO2 capture at elevated temperatures has been achieved using few-layered graphene nanosheets prepared from solid waste from high energy explosive materials industry. The materials demonstrated high adsorption capacity, selectivity towards CO2, fast adsorption kinetics, and recycling stability, making them promising for real-life CO2 capture applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Van-Dat Doan, Ngoc-Vy Nguyen, Thi Lan-Huong Nguyen, Vy Anh Tran, Van Thuan Le
Summary: In this study, a ternary magnetically separable nanocomposite of silver nanoparticles embedded in magnetic graphene oxide was successfully synthesized and characterized. The material exhibited ultrafast catalytic reduction of organic pollutants with excellent stability and recoverability. Therefore, it holds promise for potential applications in wastewater treatment.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Eunji Ji, Min Jung Kim, Jong-Young Lee, Dongchul Sung, Namwon Kim, Jin-Woo Park, Suklyun Hong, Gwan-Hyoung Lee
Summary: The study investigates the influence of substrate conditions on the doping and degradation of graphene, revealing that the hydroxyl groups on the oxygen-plasma-treated SiO2 substrate alter the characteristics of graphene and lead to decreased reactivity and conductivity.Graphene on P-SiO2 exhibits higher reactivity due to doping induced by -OH groups and shows reduced carrier mobility and larger shift of charge neutral point. Meanwhile, the device on the bare SiO2 shows negligible changes even after UV exposure.
Article
Agricultural Engineering
Zhiliang Zhang, Wei Liu, Bingqian Lv, Ting Ju, Jianbing Ji
Summary: Nanonization of lignin into nanoparticles enhances its reduction ability, and the gas-driven shearing nanonization method offers a green and simple alternative for the preparation of LNs.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Nanoscience & Nanotechnology
Ahmed Badreldin, Khaled Elsaid, Yiming Wubulikasimu, Karim Youssef, Zafar Khan Ghouri, Abdellatif El Ghenymy, Dharmesh Kumar, Ahmed Abdala, Ahmed Abdel-Wahab
Summary: In this study, we have developed a thermochemical reduction technique to directly reduce CO2 to different-quality rGO solids. By investigating the factors such as copper catalytic substrates, reaction time, and CO2 humidity content, we have achieved high-quality rGO with low defect densities and large particle and crystallite sizes under specific operating conditions.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Takaaki Taniguchi, Kar Chun Wong, Leanddas Nurdiwijayanto, Kazuto Hatakeyama, Keisuke Awaya, Shintaro Ida, Michio Koinuma, Shigenori Ueda, Minoru Osada, Hiroyuki Yokoi
Summary: The study investigates the mechanism for producing reduced graphene oxide through electrochemical reduction and oxidation cycles. The characteristic structure of COH-CH is identified as a result of this process. Electrons transferred through electrochemical reduction can partially delocalize in rGO, activating a pseudocapacitance likely derived from COH.
Article
Nanoscience & Nanotechnology
Lena Patterer, Eva B. Mayer, Stanislav Mraz, Peter J. Poellmann, Marcus Hans, Daniel Primetzhofer, Isnaldi R. Souza Filho, Hauke J. Springer, Jochen M. Schneider
Summary: Understanding the effect of gangue elements is crucial for optimizing the efficiency of hydrogen-based direct reduction of iron ore. In this study, Si-doped Fe2O3 thin films were used as a model system to investigate the solid-state reduction behavior. X-ray photoelectron spectroscopy was employed to analyze the chemical state of the films before and after annealing at 700 degrees C in an Ar+5%H2 atmosphere. It was found that even low Si concentrations of 3.7 at.% hindered the hydrogen reduction of Fe2O3 by forming a SiOx-enriched reduction barrier.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Zhijing Huang, Zihan Yan, Guangdong Zhu, Xing Chen, Shuming Zeng, Xiuyun Zhang, Liang Zhao, Yusong Tu
Summary: This study demonstrates that water molecules can spontaneously dissociate on graphene oxide (GO) supported by a copper substrate (Copper-GO). The water dissociation barrier on Copper-GO is significantly decreased compared to that on GO due to the orbital-hybridizing interaction between the copper substrate and GO. The findings suggest a novel strategy for accessing water dissociation and highlight the role of substrates in tuning the catalytic performance of two-dimensional materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Xuan Zhang, Ningning Wang, Tong Liu, Yuhua Wu, Zheng Wang, Huanting Wang
Summary: This study demonstrates the fabrication of a thin graphene oxide (GO) membrane with precisely tailored interlayer channels on a glass fiber (GF) filter as a porous substrate. By partial thermal reduction of GO, this membrane exhibits extraordinary hydrogen separation performance with high H2 permeance and selectivity. The membrane also shows excellent durability with no performance degradation during a long-term test.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Energy & Fuels
Meng Gao, Xia Dong, Kedian Wang, Wenqiang Duan, Xiaomao Sun, Chenguang Zhu, Wenjun Wang
Summary: A one-step picosecond laser direct-writing method is proposed to synthesize graphene/MnO nanocomposites and process interdigital electrodes for microsupercapacitors, achieving a high specific capacitance of 470 mF cm(-2). The symmetric microsupercapacitors based on graphene/MnO interdigital electrodes exhibit excellent electrochemical performance, with a maximum energy density of 4.89 mu MTh cm(-2) and a maximum power density of 0.72 mW cm(-2). This approach also offers a way to synthesize other graphene/metal oxide nanocomposites for microsupercapacitors.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Multidisciplinary
Xu Xiang, Ying Zhu, Changqin Gao, Han Du, Chunwen Guo
Summary: The study compared the reductions of rGO by thermal, microwave, UV, and reducing agent methods, finding that thermal reduction is the most effective method with UV reduction following closely behind. Chemical reduction had lower efficiency while microwave reduction had the lowest efficiency but increased the hydrophilicity of rGO.
Article
Engineering, Biomedical
Kijun Park, Seunghoi Kim, Yejin Jo, Jae Park, Inwoo Kim, Sooyoung Hwang, Yeontaek Lee, So Yeon Kim, Jungmok Seo
Summary: Implantable biomedical devices need a durable surface with anti-biofouling, low friction, and mechanical strength for better performance and longevity. However, there is currently no method that can provide uniform and effective coatings for medical devices with complex shapes and materials to prevent immune-related side effects and thrombosis when interacting with biological tissues.
BIOACTIVE MATERIALS
(2023)
Article
Chemistry, Physical
Minkyu Lee, Sanghyeon Lee, Myoungsub Kim, Seungmin Lee, Chihyeong Won, Taehoon Kim, Chaebeen Kwon, Kukro Yoon, Jinhan Lee, Hyungjun Kim, Taeyoon Lee
Summary: 3D cross-point memory arrays are a promising solution for future memory architecture due to their cost efficiency and high density. This study introduces a new type of Ge1-xSx film as an ovonic threshold switching (OTS) selector, which exhibits low leakage current and high thermal stability. By analyzing devices with different compositions, the mechanism and electrical characteristics of the devices are studied. This innovative research lays the foundation for enabling 3D cross-point memory.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Dong Gue Roe, Dong Hae Ho, Yoon Young Choi, Young Jin Choi, Seongchan Kim, Sae Byeok Jo, Moon Sung Kang, Jong-Hyun Ahn, Jeong Ho Cho
Summary: With advances in robotic technology, the complexity of robot control has been increasing due to fundamental signal bottlenecks and limited expressible logic state of the von Neumann architecture. Here, we demonstrate coordinated movement by a fully parallel-processable synaptic array with reduced control complexity. The proposed synaptic control system provides considerable scope for the advancement of robotic control systems.
NATURE COMMUNICATIONS
(2023)
Review
Chemistry, Analytical
Yu-Shih Chen, Chun-Hao Huang, Ping-Ching Pai, Jungmok Seo, Kin Fong Lei
Summary: Electrical impedance biosensors, embedded with microfluidic technologies, have the potential to greatly improve sensitivity, reduce reagent consumption, and shorten analysis time. Microfluidics-enabled automation enhances the reliability and efficiency of analyses. The integration of electrical impedance biosensors with microfluidic systems enables the development of portable and user-friendly devices.
Article
Nanoscience & Nanotechnology
Kukro Yoon, Sanghyeon Lee, Donghun Shim, Minkyu Lee, Sungjoon Cho, Chaebeen Kwon, Chihyeong Won, Jinhan Lee, Han Hee Jung, Seungmin Lee, Kyung-In Jang, Jaehong Lee, Taeyoon Lee
Summary: A facile chemical process was used to fabricate highly conductive buckled shells by densely distributing Ag nanoparticles in polyurethane, resulting in strain-insensitive stretchable fiber conductors. These buckled AgNPs/PU fibers showed stable and reliable electrical responses, high electrical conductivity, and quality factor. pH sensors based on these fibers also exhibited stable, repeatable, and highly distinguishable responses under high tensile strain.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Kijun Park, Soojung An, Jihyun Kim, Sungjun Yoon, Jihyang Song, Daekwang Jung, Jae Park, Yeontaek Lee, Donghee Son, Jungmok Seo
Summary: Coronary artery bypass grafting is commonly used to treat cardiovascular diseases but has limitations due to the availability of blood vessels and low long-term patency rate. A bioelectronic conduit with self-healing properties and a lubricious inner coating, called RAAVG, was developed to address these issues. It showed resistance against mechanical stimuli, prevented leakage, and presented antibiofouling and antithrombotic properties. Additionally, a blood-flow sensor integrated into the RAAVG allowed sensitive monitoring of blood flow. Ex vivo and in vivo experiments demonstrated the biocompatibility and feasibility of RAAVG as an artificial graft, which can improve the long-term patency rate of coronary artery bypass grafts.
Review
Chemistry, Multidisciplinary
Yifei Luo, Mohammad Reza Abidian, Jong-Hyun Ahn, Deji Akinwande, Anne M. Andrews, Markus Antonietti, Zhenan Bao, Magnus Berggren, Christopher A. Berkey, Christopher John Bettinger, Jun Chen, Peng Chen, Wenlong Cheng, Xu Cheng, Seon-Jin Choi, Alex Chortos, Canan Dagdeviren, Reinhold H. Dauskardt, Chong-an Di, Michael D. Dickey, Xiangfeng Duan, Antonio Facchetti, Zhiyong Fan, Yin Fang, Jianyou Feng, Xue Feng, Huajian Gao, Wei Gao, Xiwen Gong, Chuan Fei Guo, Xiaojun Guo, Martin C. Hartel, Zihan He, John S. Ho, Youfan Hu, Qiyao Huang, Yu Huang, Fengwei Huo, Muhammad M. Hussain, Ali Javey, Unyong Jeong, Chen Jiang, Xingyu Jiang, Jiheong Kang, Daniil Karnaushenko, Ali Khademhosseini, Dae-Hyeong Kim, Il-Doo Kim, Dmitry Kireev, Lingxuan Kong, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Lee, Fengyu Li, Jinxing Li, Cuiyuan Liang, Chwee Teck Lim, Yuanjing Lin, Darren J. Lipomi, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Liu, Xian Jun Loh, Nanshu Lu, Zhisheng Lv, Shlomo Magdassi, George G. Malliaras, Naoji Matsuhisa, Arokia Nathan, Simiao Niu, Jieming Pan, Changhyun Pang, Qibing Pei, Huisheng Peng, Dianpeng Qi, Huaying Ren, John A. Rogers, Aaron Rowe, Oliver G. Schmidt, Tsuyoshi Sekitani, Dae-Gyo Seo, Guozhen Shen, Xing Sheng, Qiongfeng Shi, Takao Someya, Yanlin Song, Eleni Stavrinidou, Meng Su, Xuemei Sun, Kuniharu Takei, Xiao-Ming Tao, Benjamin C. K. Tee, Aaron Voon-Yew Thean, Tran Quang Trung, Changjin Wan, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Wang, Paul S. Weiss, Hanqi Wen, Sheng Xu, Tailin Xu, Hongping Yan, Xuzhou Yan, Hui Yang, Le Yang, Shuaijian Yang, Lan Yin, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Yu, Evgeny Zamburg, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhang, Siyuan Zhao, Xuanhe Zhao, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zheng, Tao Zhou, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zhu, Guijin Zou, Xiaodong Chen
Summary: Humans are increasingly relying on flexible sensors to address challenges and improve quality of life in the digital and big data era. However, the market adoption of flexible sensors is still limited despite advancements in research. In this paper, we identify the bottlenecks hindering the maturation of flexible sensors and propose potential solutions to expedite their deployment and commercialization.
Article
Chemistry, Multidisciplinary
Bangjie Shao, Tianqing Wan, Fuyou Liao, Beom Jin Kim, Jiewei Chen, Jianmiao Guo, Sijie Ma, Jong-Hyun Ahn, Yang Chai
Summary: This article introduces a method of encryption in the sensor, which achieves highly reliable encryption and authentication by binding the generated key with the image.
Article
Chemistry, Multidisciplinary
Chaebeen Kwon, Sanghyeon Lee, Chihyeong Won, Kyu Hyoung Lee, Minyoung Kim, Jaehong Lee, Seung-Jae Yang, Minkyu Lee, Seungmin Lee, Kukro Yoon, Sungjoon Cho, Taeyoon Lee
Summary: A multi-functional and stretchable bismuth telluride (Bi2Te3) thermoelectric fabric has been fabricated, which exhibits excellent electrical reliability and can detect both normal pressure and temperature difference.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Sukhwan Jun, Seunggi Seo, Seungwon Park, Tae Hyun Kim, Minkyu Lee, Seok Man Hong, Taehoon Kim, Seung-min Chung, Taeyoon Lee, Myoungsub Kim, Hyungjun Kim
Summary: In this study, Ge-Se-S amorphous chalcogenide alloys were synthesized using atomic layer deposition (ALD) for potential ovonic threshold switch (OTS) applications. The composition of the Ge-Se-S thin films was controlled by adjusting the temperature and low-temperature plasma sulfurization time. Compared to ALD GeSe2, the Ge5Se3S2 alloy exhibited a slightly larger threshold voltage drift but demonstrated advantages in terms of higher threshold field, lower off-current, and smaller threshold voltage fluctuation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Jiewei Chen, Zheng Zhou, Beom Jin Kim, Yue Zhou, Zhaoqing Wang, Tianqing Wan, Jianmin Yan, Jinfeng Kang, Jong-Hyun Ahn, Yang Chai
Summary: Inspired by agile insects, researchers emulate graded neurons using optoelectronic devices to achieve bioinspired in-sensor motion perception with high recognition accuracy. This study is important for understanding efficient motion perception in insects and its application in artificial intelligence.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Mingyu Sang, Myeongki Cho, Selin Lim, In Sik Min, Yuna Han, Chanwoo Lee, Jongwoon Shin, Kukro Yoon, Woon-Hong Yeo, Taeyoon Lee, Sang Min Won, Youngmee Jung, Yun Jung Heo, Ki Jun Yu
Summary: Continuous glucose monitoring (CGM) system allows diabetes patients to effectively manage their disease and prevent exacerbation. We propose a glucose-responsive fluorescence-based highly sensitive biodegradable microneedle CGM system that can painlessly and precisely monitor glucose concentration in the interstitial fluid.
Article
Nanoscience & Nanotechnology
Larionette P. L. Mawlong, Anh Tuan Hoang, Jyothi Chintalapalli, Seunghyeon Ji, Kihyun Lee, Kwanpyo Kim, Jong-Hyun Ahn
Summary: This study introduces a new method for synthesizing large-area, high-quality two-dimensional transition metal dichalcogenides, such as MoS2. The method improves the performance of photodetectors and reduces sulfur vacancy defects in the film, which significantly affects material quality.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Jeongsik Lim, Sangwon Lee, Jejung Kim, Jeonghoon Hong, Sooho Lim, Kyungtae Kim, Jeongwoo Kim, Sungchil Yang, Sunggu Yang, Jong-Hyun Ahn
Summary: Various techniques, such as electrocorticography (ECoG), have been studied for the diagnosis and treatment of epilepsy. This study developed a high-density, flexible electrode array with graphene/Au/graphene, which successfully detected brain signals and suppressed epileptic discharges and behavior in rats. Simultaneous recording and neurostimulation in awake animals could have a fundamental impact on the treatment of medically intractable epilepsy.
NPG ASIA MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Meili Xia, Jianwen Liu, Beom Jin Kim, Yongju Gao, Yunlong Zhou, Yongjing Zhang, Duxia Cao, Songfang Zhao, Yang Li, Jong-Hyun Ahn
Summary: In this study, a skin-compliant dry electrode with excellent performance and water/motion interference resistance was developed. The electrode exhibited low impedance, high stretchability, and stability, thanks to the kirigami structure and unique encapsulation. Compared to traditional dry or gel electrodes, this electrode can effectively capture high-quality biopotential signals and facilitate human-machine interactions under various conditions.