Article
Chemistry, Physical
Ryosuke Matsuo, Yuki Takahashi, Seiichi Watanabe, Satoshi Okabe
Summary: Three-dimensional ZnO/CuO nanoforests were synthesized through galvanic submerged photosynthesis in water at ambient conditions, and their photoelectrochemical properties and applicability in microbial PEC cells were evaluated. The ZnO/CuO nanoforests exhibited high PEC current and hydrogen generation rate due to their superior light absorption, large BET specific surface area, and low charge recombination. The biocompatibility of the nanoforests was assessed by studying their effect on bacterial growth and it was found that Cu leaching could be prevented by maintaining the potential at a certain value.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Electrical & Electronic
Wen-Fu Qin, Hai-Ming Zhang, Xiang-Bing Li, Yu-Wen Xing, Yu-Xuan Guo, Yan-Yun Feng, Yu-Jie Li, Si-Qi Han, Ke-Fan Ma, Huan-Huan Cao, Si-Nan Liu, Xiao-Min Jia, Chang-Hong Zhou
Summary: Hexagonal zinc oxide (ZnO) with rough surface was synthesized by hydrothermal method using surfactant. The morphology and nanostructure were characterized, and the gas sensing properties of modified and unmodified ZnO sensors were compared. The modified ZnO sensor exhibited improved gas sensing performance, particularly for acetic acid, with good selectivity and accuracy in measurement.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Tao Zhang, Qinggang Li
Summary: This study proposed a convenient method for the fabrication of VO2(M) by thermolysis of NH4VO3 under sealed atmosphere without additional gas or solid reagents consumption. The research found that NH3 produced during the thermolysis process provided a protective atmosphere to prevent the oxidation of VO2(B). Furthermore, it was discovered that VO2(M) could be directly synthesized under the sealed atmosphere by increasing the reaction temperature.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tao Zhang, Qinggang Li
Summary: This study investigates the thermolysis of NH4VO3 under different conditions and analyzes the thermodynamics of V-O and V-O-NH3. The results show that the sealed condition is more suitable for the fabrication of low valence vanadium oxides and can fully utilize NH3. Pure V2O3 can be obtained under the sealed condition, indicating a higher efficiency in NH3 utilization.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Hye Seong Jang, Gyu Hyeon Jeong, Hoon Ju Lee, Hyeon Suk Shin, Yeongsik Hwa, Sang-Soo Chee, Sae Yane Paek, Jong Min Kim, Byeongseo Son, Dongwoo Kang, Gyeong Hee Ryu
Summary: In this study, flower-like Zinc Oxide (f-ZnO) nanostructures with high surface area-to-volume ratios and porous morphology were successfully synthesized using a surfactant-assisted method. The f-ZnO demonstrated photoelectrochemical performance due to increased interfacial contact with electrolytes and the formation of a wurtzite ZnO crystal structure. Additionally, the f-ZnO exhibited sensitivity and selectivity as a hydrogen sulfide gas sensor. This facile synthesis method opens up new avenues for developing functional oxide nanostructures for sensors, catalysts, and energy storage systems.
MATERIALS TODAY ADVANCES
(2023)
Article
Chemistry, Physical
Mengwei Gao, Yuanbo Song, Yidan Liu, Wentao Jiang, Jianchao Peng, Liyi Shi, Rongrong Jia, Yaseen Muhammad, Lei Huang
Summary: In this study, a novel approach was proposed to fabricate Au@MnO2 core/shell assembled nanosheets utilizing the localized surface plasmon resonance (LSPR) effect of gold nanoparticles. The reduction of KMnO4 to MnO2 on Au NPs under 520 nm light resulted in the gradual assembly into thin sheeted morphology. The significance of irradiation conditions and surface functional groups, particularly the 520 nm light and citrate group, in the formation of stable Au@MnO2 core-shell assembled nanosheets was systematically studied. The controllable, green, and facile nature of this approach allows for its extension to synthesize other complex nanomaterials for various applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Fatemeh Heidari Gourji, Tharmakularasa Rajaramanan, Oyvind Frette, Dhayalan Velauthapillai
Summary: In this research, ternary metal molybdate nanomaterials with a unique yolk-shell hollow structure were successfully synthesized using a self-templating method. These materials showed remarkable performance as electrode materials in supercapacitors.
Article
Chemistry, Multidisciplinary
Fan Ru, Jing Xia, Xuanze Li, Pei Liu, Peiyu Qiao, Yuye Li, Jianyu Cao, Lifeng Tian, Wenjun Zhang, Xiang-Min Meng
Summary: This report demonstrates the successful remote heteroepitaxy of single-crystalline ZnO/ZnS core/shell nanowires using amorphous HfO2 as the buffer layer. By adjusting the buffer layer thickness, zinc blende or wurtzite ZnS epilayers can be efficiently fabricated. The cathodoluminescence measurement shows that tuning of the optical properties can be achieved by preparing a heterostructure with HfO2.
Article
Chemistry, Physical
Bin Zeng, Xutao Ning, Linfang Li
Summary: A novel ZnO hexagonal cap/MXene composite with exposed polar facets was synthesized using a hydrothermal method. The analysis of morphology, structure, and photochemical properties indicated the formation of a heterojunction between ZnO and MXene. The ZnO hexagonal cap with 3 mL MXene exhibited the highest photodegradation efficiency of 87.8% for methyl orange within 60 min under a xenon lamp. & BULL;OH and h+ species were found to be the major contributors to the degradation. The excellent photocatalytic activity was attributed to the Schottky barrier hindrance, highly active exposed facets, and favorable hollow structure of the ZnO hexagonal cap@Ti3C2 MXene.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
T. P. Vijayakumar, M. D. Benoy, J. Duraimurugan, G. Suresh Kumar, S. Shanavas, P. Maadeswaran, Roberto Acevedo
Summary: The study found that the g-C3N4@ZnO heterostructure exhibited superior optical and photocatalytic properties, showing better degradation of RhB dye, by inhibiting the recombination of charge carriers and generating a large number of reactive species.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Polymer Science
Pedro J. Rivero, Juan P. Fuertes, Adrian Vicente, Alvaro Mata, Jose F. Palacio, Maria Monteserin, Rafael Rodriguez
Summary: A one-step electrospinning technique was employed to design and develop functional surfaces with desired morphology using PCL and ZnO NPs, showing the importance of operational parameters and material concentration in achieving optimal surface properties. The presence of ZnO NPs within the electrospun fibers played a key role in corrosion resistance, although it also led to a decrease in water contact angle. The study demonstrated the effectiveness of using a design of experiment to optimize the surface morphology for better corrosion resistance and wettability.
Article
Chemistry, Physical
Yanyan Liu, Zhouyu Tong, Kaiyuan Che, Mingliang Ma, Weibo Huang, Kwok L. Chung, Yong Ma, Guanglei Wu, Zongxu Na, Fangyu Fan
Summary: Efficient microwave absorption materials are crucial in reducing harm from electromagnetic pollution. In this study, porous hexagonal flaky Co@C core-shell composites were successfully designed and fabricated, showing excellent performance in terms of reflection loss and effective absorption bandwidth.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Chengyun Wang, Guofu Zhang, Yuan Xu, Yicong Chen, Shaozhi Deng, Jun Chen
Summary: A fully vacuum-sealed addressable flat-panel X-ray source based on ZnO nanowire field emitter arrays was successfully fabricated, demonstrating the feasibility of localized X-ray emission and imaging. The device used a diode structure composed of cathode and anode panels, with ZnO nanowire cold cathodes on the cathode panel and Mo thin film strips on the anode panel. The results showed a radiation dose rate of 10.8 mu Gy/s at an anode voltage of 32 kV and the potential for advanced X-ray imaging using different addressing schemes.
Article
Computer Science, Information Systems
Lakshmiprasad Maddi, Khidhirbrahmendra Vinukonda, Thirumala Rao Gurugubelli, Ravindranadh Koutavarapu
Summary: An in-situ hydrothermal process was used to create Co-doped ZnO/CdS nanosheets, and the effects of Co ions on the test material's structural, morphological, optical, and magnetic characteristics were examined. The development of a hexagonal wurtzite structure was confirmed by XRD for both ZnO and CdS. SEM, TEM, and HR-TEM studies revealed a sheet-like morphology. Essential elements (S, Cd, O, Co, and Zn) were verified by elemental mapping and XPS examination. Co-doping significantly enhanced the nanosheets' ability to absorb light in the visible region. The bandgap energy (2.59 eV) was well-regulated and a yellow emission band at 577 nm was observed in the PL spectrum.
Article
Materials Science, Multidisciplinary
Fei Hu, Ting Li, Tianbiao Sun, Yidan Liu, Dongqi Yu, Rongrong Jia, Liyi Shi, Lei Huang
Summary: This work presents a controllable, green, and facile strategy for preparing Au NRs@MnO2 core/shell nanosheets using the LSPR effect of gold nanorods. MnO2 is obtained through the reduction of KMnO4 with photoelectrons induced by the LSPR effect. Methanol is found to be significant in maintaining the shape of Au nanorods by acting as a hole scavenger, and the OER performance of the resulting Au NRs@MnO2 is notably enhanced under proper irradiation and stable after 1000 cycles.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Seungki Hong, Dong-Myeong Lee, Min Park, Jae-Hyung Wee, Hyeon Su Jeong, Bon-Cheol Ku, Cheol-Min Yang, Dong Su Lee, Mauricio Terrones, Yoong Ahm Kim, Jun Yeon Hwang
Review
Nanoscience & Nanotechnology
Thi Sinh Vo, Muhammad Mohsin Hossain, Hyung Mo Jeong, Kyunghoon Kim
Article
Engineering, Environmental
Hyeon Dam Jeong, Seo Gyun Kim, Gyeong Min Choi, Minji Park, Bon-Cheol Ku, Heon Sang Lee
Summary: The orientation factor plays a crucial role in producing highly strong conductive carbon nanotube (CNT) fibers. A theoretical model is proposed to obtain well-aligned CNT fibers with superior properties through wet-spinning of CNTs in a superacid. The model predicts the minimum draw ratio for achieving target orientation and stable operation window using linear stability analysis of the draw resonance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Maria Vila, Seungki Hong, Seunggyu Park, Anastasiia Mikhalchan, Bon-Cheol Ku, Jun Yeon Hwang, Juan J. Vilatela
Summary: This study demonstrates that carbon nanotubes with a sufficiently large diameter and a few layers can self-collapse into flat ribbons at atmospheric pressure, forming bundles that maximize packing and enhance interaction. Through cross-sectional transmission electron microscopy of focused ion beam-milled samples, collapsed CNTs can be uniquely identified in macroscopic fibers, providing insight into their properties and growth mechanisms. The use of selenium as a growth promotor can result in a maximum fraction of collapsed CNTs of 70%, with an average of 0.25 layers/nm.
ACS APPLIED NANO MATERIALS
(2021)
Article
Polymer Science
Minsik Choi, Junghwan Kim, Yuna Oh, Jaesang Yu, Sung-Gi Kim, Heejoun Yoo, Seongwoo Ryu, Nam-Ho You, Bon-Cheol Ku
Summary: Poly(phenylene sulfide) (PPS) grafting can be achieved by sulfur-assisted reduced graphene oxide (SrGO) via SNAr mechanism. The use of highly concentrated SrGO and masterbatch (MB) enhances the tensile strength, electrical and thermal conductivities, and flame retardancy of PPS-coated SrGO. Dilution of the MB in PPS resin results in finely distributed SrGO and preserves or enhances thermal conductivity and flame retardancy of PPS/SrGO.
Article
Multidisciplinary Sciences
Dongju Lee, Seo Gyun Kim, Seungki Hong, Cristina Madrona, Yuna Oh, Min Park, Natsumi Komatsu, Lauren W. Taylor, Bongjin Chung, Jungwon Kim, Jun Yeon Hwang, Jaesang Yu, Dong Su Lee, Hyeon Su Jeong, Nam Ho You, Nam Dong Kim, Dae-Yoon Kim, Heon Sang Lee, Kun-Hong Lee, Junichiro Kono, Geoff Wehmeyer, Matteo Pasquali, Juan J. Vilatela, Seongwoo Ryu, Bon-Cheol Ku
Summary: Multidimensional nanostructures formed by coalescence of carbon nanotubes can create fibers with exceptional mechanical and electrical properties.
Article
Chemistry, Physical
Seo Gyun Kim, Gyeong Min Choi, Hyeon Dam Jeong, Dongju Lee, Sungyong Kim, Ki-Hyun Ryu, Suhun Lee, Jungwon Kim, Jun Yeon Hwang, Nam Dong Kim, Dae-Yoon Kim, Heon Sang Lee, Bon-Cheol Ku
Summary: This study systematically investigates the spinning process of carbon nanotube fibers and emphasizes the importance of controlling voids for enhancing their macroscopic properties. By utilizing extensional deformation through drawing and controlling the coagulation process, high-performance multifunctional CNT fibers with highly oriented structures were successfully produced.
Article
Chemistry, Physical
Junghwan Kim, Sungyong Kim, So Jeong Heo, Seo Gyun Kim, Nam-Ho You, Han Gi Chae, Hwan Chul Kim, Bon-Cheol Ku
Summary: Polyimide/graphene oxide nanoribbon (PI/GONR) composite fibers were prepared through wet spinning, where the unfolded GONRs contributed significantly to the improved mechanical and conductivity properties. Optimal drawing and carbonization conditions resulted in composite fibers with higher tensile strength, electrical conductivity, and thermal conductivity. These properties are comparable to Toray carbon fiber (T700).
Article
Biotechnology & Applied Microbiology
Thi Sinh Vo, Muhammad Mohsin Hossain, Jinwoo Lee, Jonghwan Suhr, Kyunghoon Kim
Summary: This study successfully explored the incorporation of chitosan and green filler materials (bamboo powders and coffee grounds) for low-cost adsorbents. The resulting composite foams exhibited excellent compressive properties and were effective in removing organic dyes from water, with superior recyclability compared to other adsorbents. These composite foams have the potential for applications in wastewater treatment due to their high performance, reusability, eco-friendly properties, and simple and low-cost fabrication processes.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Review
Materials Science, Multidisciplinary
Dongju Lee, So Jeong Heo, Seo Gyun Kim, Bon-Cheol Ku
Summary: This article discusses the growing importance of high-performance carbon fibers and the challenges in developing CFs with both tensile strength and modulus with high conductivity. It highlights the use of carbon nanotubes in producing composite CFs and explores the potential applications in aerospace, defense, and other industries. The challenges and outlook for commercialization of CNT-based CFs are also addressed.
FUNCTIONAL COMPOSITES AND STRUCTURES
(2023)
Article
Engineering, Environmental
Thi Sinh Vo, Muhammad Mohsin Hossain, Tae Gyeong Lim, Ji Won Suk, Sun Choi, Kyunghoon Kim
Summary: In this study, the interfacial surface of glass fiber was modified using a graphene oxide/chitosan hybrid network for the first time to fabricate a composite membrane for waste-water treatment applications. The composite membrane exhibited excellent adsorption performance and recycling performance in removing cationic and anionic dyes. The adsorption performance was consistent with chemical adsorption and monolayer approach models.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Thi Sinh Vo, Muhammad Mohsin Hossain, TaeGyeong Lim, Ji Won Suk, Sun Choi, Kyunghoon Kim
Summary: This study presents a novel approach for the preparation of efficient dye-removing polymer composite membranes by modifying the surface of dialysis cellulose and incorporating an active graphene oxide-chitosan composite hydrogel network. The resulting membranes exhibit high adsorption capacities for both cationic and anionic dyes, as well as improved structural stability and sustainability during the recycling process.
ACS APPLIED BIO MATERIALS
(2022)
Article
Polymer Science
Jongho Kim, Nam-Ho You, Bon-Cheol Ku
Article
Nanoscience & Nanotechnology
Seo Gyun Kim, Nam-Ho You, Bon-Cheol Ku, Heon Sang Lee
ACS APPLIED NANO MATERIALS
(2020)
Review
Materials Science, Composites
Minsik Choi, Jungrok Lee, Seongwoo Ryu, Bon-Cheol Ku
COMPOSITES RESEARCH
(2020)
