Article
Chemistry, Multidisciplinary
Satya Ranjan Jena, M. B. Bhavya, Sai Rashmi Manippady, Prangya Bhol, Swarnalata Swain, Manav Saxena, Pramila Kumari Misra, Akshaya K. Samal
Summary: Core-shell metal-semiconductor nanostructures show excellent catalytic performance for dye degradation and organic pollutant reduction. The Au@Cu2O nanostructures exhibit a ten times higher reduction rate for 4-NP compared to Au NPs, demonstrating enhanced catalytic activity.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Hansa Mahajan, Seongjae Cho
Summary: Metal-oxide nanomaterials have attracted great interest due to their novel characteristics. In this study, a fascinating Au nanorod/cuprous oxide core-shell composite was synthesized for energy storage applications in a supercapacitor. The composite exhibited high specific capacitance and durable cycling stability, attributed to the presence of AuNR in the core.
Article
Chemistry, Analytical
Yongjiao Sun, Zhenting Zhao, Rui Zhou, Pengwei Li, Wendong Zhang, Koichi Suematsu, Jie Hu
Summary: The study successfully prepared different sizes of cubic indium oxide nanocube clusters and their composites with Au nanoparticles using a solvothermal method, demonstrating that the Au@In2O3 system exhibits the best sensing properties. The Au nanoparticles enhance the receptor function of the semiconductor gas sensor, leading to increased sensing response.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Ting-Hsuan Lai, Chun-Wen Tsao, Mei-Jing Fang, Jhen-Yang Wu, Yu-Peng Chang, Yi-Hsuan Chiu, Ping-Yen Hsieh, Ming-Yu Kuo, Kao-Der Chang, Yung-Jung Hsu
Summary: In this study, Au@Cu2O core-shell and Au@Cu2Se yolk-shell nanocrystals were used as photocatalysts in photoelectrochemical water splitting and photocatalytic hydrogen production. The enhanced charge separation and additional charge carrier generation were achieved through the combination of the Au core and shells, as well as the localized surface plasmon resonance effect of Au. The improved interfacial charge transfer resulted in higher photocurrent and photocatalytic activity compared to the pure counterpart samples.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Qiang Zhong, Yue Sun, Shixi Wu, Chenmin Xu, Shaogui Yang, Yazi Liu, Dunyu Sun, Bing Yang, Yinhao Dai, Chengdu Qi, Zhe Xu, Huan He, Shiyin Li, Shaobin Wang
Summary: Modifying the coordination environment and engineering the architecture of Fenton-like catalysts can effectively enhance catalytic reactions. In this study, two-dimensional (2D) porous core-shell FeSe2+x@C nanocube superlattices (NCSLs) with unsaturated selenium were synthesized for the first time, and were tested for peroxymonosulfate (PMS)-based Fenton-like reaction. The 2D porous superlattice structure expanded the exposure of Fe sites and facilitated the transport and utilization of nanocrystals. The unsaturated selenium optimized the electronic state of cationic Fe, promoting the Fe3+/Fe2+ cycle, regulating PMS adsorption, improving the charge density, and accelerating interfacial electron transport, thus reducing the energy barrier for PMS decomposition.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Nanoscience & Nanotechnology
Mikel Rincon-Iglesias, Irati Rodrigo, Leixuri B. Berganza, Esraa Samy Abu Serea, Fernando Plazaola, Senentxu Lanceros-Mendez, Erlantz Lizundia, Javier Reguera
Summary: This study reports on the synthesis of Fe3O4@Au core-shell nanorods and their incorporation into an agarose hydrogel to achieve anisotropic magnetic and optical properties. The results demonstrate the potential application of these materials in magneto- and photothermal therapy.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Qian Zhu, Yan Wang, Fu Chen, Xiaohong Yang, Hui Ou, Shixian Xiong, Haitao Fu
Summary: In this study, novel Au@Cu2O-Ta3N5 discrete core-shell ternary nanospheres were prepared for highly efficient photocatalytic H-2 production. The core-shell structure irradiated for 2 h showed a higher photocatalytic H-2 production rate compared to other samples. The enhanced performance is attributed to the unique discrete core-shell structure, designed appropriate band structure, low charge transfer resistance, and high electron-hole separation ability. This study provides a novel Ta3N5-based ternary core-shell structure for high-performance H-2 production.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Mei-Jing Fang, Yu -Chang Lin, Jen-Yu Jan, Ting-Hsuan Lai, Ping -Yen Hsieh, Ming-Yu Kuo, Yi-Hsuan Chiu, Chun-Wen Tsao, Yi-An Chen, Yi-Jia Hong, Jhen-Yang Wu, Yew Chung Sermon Wu, Yan-Gu Lin, Tso-Fu Mark Chang, Chun-Yi Chen, Masato Sone, Sue -Min Chang, Chung-Liang Chang, Yung-Jung Hsu
Summary: Au@Cu2O core@shell nanocrystals are demonstrated to be sustainable catalysts for efficient hydrogen production from ammonia borane (AB). By leveraging the core@shell structure and electronic interactions, Au@Cu2O shows remarkable performance in AB hydrolysis. The effect of shell thickness on hydrogen production and dehydrogenation of AB is investigated systematically. The research findings not only expand the family of metal/metal oxide composite catalysts for AB hydrolysis but also deepen the understanding of core@shell structural features and electronic interactions in AB dehydrogenation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Lin Guo, Zhu Mao, Sila Jin, Lin Zhu, Junqi Zhao, Bing Zhao, Young Mee Jung
Summary: Surface-enhanced Raman scattering (SERS) is a powerful tool for studying charge transfer processes, especially when analyzing relative band strengths in core-shell structures involving nanorods with different L/D ratios. Adjusting the surface plasmon resonance (SPR) absorption bands by tuning the L/D ratios of the nanorod cores can directly impact the charge transfer process, and the specific surface area of the nanorods plays a crucial role in this interaction.
Article
Nanoscience & Nanotechnology
Lin Guo, Zhu Mao, Chao Ma, Jiawei Wu, Lin Zhu, Bing Zhao, Young Mee Jung
Summary: Nanoscale materials have unique advantages in solar energy utilization due to their perfect match with visible light wavelength. The study investigated the charge transfer process between gold nanorods and Cu2O using surface-enhanced Raman scattering spectroscopy, revealing the influence of plasmon absorption at different incident Raman laser lines. By analyzing the SERS spectra, the degree of charge transfer was calculated, with implications for improving photocatalytic efficiency and photoelectric devices.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Pei-Yu Wang, Wen-Jyng Wang, Wei-Peng Li
Summary: In this study, Au@Cu2O core-shell nanocatalysts with excellent peroxidase-like activity were prepared, and serine was successfully coordinated on the Cu2O shell. The serine-modified Au@Cu2O nanoparticles with exposed 1 degree amine and hydroxyl groups showed specific intermolecular pairings with beta-hydroxybutyric acid and volatile acetone. The click-chemistries between serine-beta HBA and serine-acetone were verified by spectroscopic analyses. This study demonstrates the concept of alternative click-chemistry-promoted colorimetric analysis and provides a new avenue for the development of advanced biosensors for small molecule detection.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Xiaobo Yang, Qiang Wang, Shaojun Qing, Zhe Gao, Xili Tong, Nianjun Yang
Summary: By designing an electrocatalyst with an Au-nanorod core and a PdPt-alloy shell, the study successfully addresses three key issues in AORs and improves the catalyst activity. Additionally, the catalyst optimizes the electronic structure and enables efficient electro-oxidation of various alcohol substances.
ADVANCED ENERGY MATERIALS
(2021)
Article
Engineering, Environmental
Bo Ma, Jinglei Bi, Jian Lv, Chuncai Kong, Pengxu Yan, Xintian Zhao, Xiaojing Zhang, Tao Yang, Zhimao Yang
Summary: Constructing heterostructure particles with noble metals on semiconductors significantly enhances hydrogen generation through boosted catalytic performance and unique inter-embedded structures. The Au-Cu2O heterostructure particles exhibit superior photocatalytic properties compared to pure Cu2O and traditional Cu2O@Au heterostructures, making them a promising design for future metal-semiconductor photocatalysts.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Analytical
Mingqi Sun, Mingyuan Wang, Chuanxin Ge, Jingran Huang, Yuanfan Li, Pengjia Yan, Shuangying Lei, Mingsong Wang, Ling Bai, Guanjun Qiao
Summary: The exploration of high-performance NO2 sensors is important for air quality monitoring and human health. This study fabricated Au-doped ZnO@ZIF-7 core-shell nanorod arrays for sensitive and selective NO2 detection. The heterostructured ZnO-Au@ZIF-7 sensor showed excellent performance in terms of sensitivity, selectivity, anti-humidity capacity, and long-term stability. This approach combining noble metals doped semiconductor metal oxides (SMOs) and MOF filtration membranes can be extended to the development of advanced chemiresistive gas sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Jiaqi Chen, Ting Zhong, Xi Lu, Pan Wang, Dawei Zhang, Wei Feng, Yuxin Yang, Xin Gou
Summary: In this study, the growth kinetic process, morphology, and stability of Au@Cu2O nanostructures were controlled by employing different surface ligands. The use of CTAB resulted in relatively stable cubic nanostructures, while the use of SDS led to the formation of nanocubes that were unstable and prone to detachment. On the other hand, the use of PAA produced the most stable nanostructures with rough surfaces. This study provides an effective way to control the nanostructures and stability of metal-semiconductor heterostructures.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Environmental Sciences
Gayathri Chellasamy, Shiva Kumar Arumugasamy, Saravanan Govindaraju, Kyusik Yun
Summary: In this study, blue-emitting carbon quantum dots derived from maple tree leaves were synthesized to selectively detect Cesium ions, showing potential applications in biomedical and environmental fields. The detailed investigation of their functional group composition, morphology, and stability was conducted, confirming their stability and suitability as probes for Cesium ion sensing. The carbon quantum dots also demonstrated a catalytic capability for glycerol electrooxidation, highlighting their versatile applications.
Article
Environmental Sciences
Shiva Kumar Arumugasamy, Gayathri Chellasamy, Sankar Sekar, Sejoon Lee, Saravanan Govindaraju, Kyusik Yun
Summary: The facile and modest synthesis of Trimetallic organic frameworks (TriMOF) on activated carbon surface from pineapple leaves shows exponential catalytic activity, leading to efficient degradation of environmental pollutants and oxygen evolution. The developed nanocomposite exhibits superior electrocatalytic surface area and active sites, enabling rapid catalytic reduction of 4-nitrophenol and efficient water oxidation process.
Article
Environmental Sciences
Sada Venkateswarlu, Minyoung Yoon, Myung Jong Kim
Summary: In this study, a new strategy for synthesizing Fe3O4 nanoclusters using edible mushrooms and environmentally friendly solvents was described. The Fe3O4 nanoclusters were functionalized with an organic molecule linker to selectively remove hazardous Hg(II) ions, demonstrating a high removal efficiency of 99.2%. The study opens up new pathways for the application of superparamagnetic DHLA@Fe3O4 nanoclusters in the medical, catalysis, and environmental fields.
Article
Environmental Sciences
Shiva Kumar Arumugasamy, Shanmugam Ramakrishnan, Dong Jin Yoo, Saravanan Govindaraju, Kyusik Yun
Summary: The study involved microwave-assisted alkaline treatment of graphene oxide to create two-dimensional carbonaceous nanocomposites with high photocatalytic degradation and catalytic activity. The synthesized material showed efficient degradation of RhB, significant capacity, and remarkable coulombic efficiency. Furthermore, the composite exhibited low overpotential and Tafel slope in oxygen evolution catalysis, emphasizing its potential for eco-friendly photocatalytic degradability and bifunctional catalytic activity.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Physical
Sivalingam Gopi, Atanu Panda, A. G. Ramu, Jayaraman Theerthagiri, Hansang Kim, Kyusik Yun
Summary: In this study, a vanadium-doped bimetallic nickeliron nanoarray was fabricated for electrochemical water splitting. The catalyst with equal mole ratio of Ni/Fe (0.06:0.06) demonstrated high catalytic activity for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline and acidic medium. The doping of vanadium showed a strong synergistic effect with Ni/Fe, resulting in improved catalytic performance. The presented catalysts exhibited excellent electrochemical performance and durability, making them promising for hydrogen energy production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Ho Jeong Choi, Seungpyo Hong, Younghu Son, Ki Tae Kim, Cheoljae Kim, Minyoung Yoon, Min Kim
Summary: Positively charged aromatic quaternary ammonium and aliphatic quaternary ammonium groups were successfully incorporated into metal-organic frameworks (MOFs) for hydroxide conductivity studies. The charge-loading efficiencies of two representative MOF functionalization strategies, post-synthetic covalent modification (PSM) and post-synthetic ligand exchange (PSE), were compared. Both PSM and PSE techniques were effective for introducing quaternary ammonium groups, but PSE showed better performance. The study also discusses the practicality of PSE for MOF functionalization and the effects of functional group modification.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Jaegyeong Lee, Iuliia Melchakova, Saira Nayab, Kyeonghun Kim, Young Ho Ko, Minyoung Yoon, Paul Avramov, Hyosun Lee
Summary: In this study, Zn(II), Pd(II), and Cd(II) complexes supported by the (E)-N-1,N-1-dimethyl-N-2-(thiophen-2-ylmethylene)ethane-1,2-diamine (LTH) ligand were synthesized and structurally characterized. The presence of two conformers and their dynamic interconversion process in solution was supported by DFT calculations and variable-temperature NMR. These complexes exhibited different geometric structures and could effectively catalyze the ring-opening polymerization of rac-lactide, with [LTHZnCl2]/(LiOPr)-Pr-I showing the highest conversion rate and producing PLA with higher heterotactic bias.
Article
Engineering, Chemical
Vinayak G. Parale, Haryeong Choi, Taehee Kim, Varsha D. Phadtare, Rushikesh P. Dhavale, Kyu-Yeon Lee, Atanu Panda, Hyung-Ho Park
Summary: To enhance the mechanical strength and heavy metal ion adsorption of silica aerogels, a novel in situ sulfur-doping synthesis method was used. Three-dimensional monolithic silica aerogels were synthesized with an adaptable one-pot epoxy-thiol reaction. The cross-linked aerogels exhibited a strong silica hybrid network with high porosity and excellent compressive strength. These aerogels showed high adsorption capacity for heavy metals, particularly Pd2+. This method offers a new strategy for synthesizing sulfur-doped silica aerogels with enhanced properties for heavy metal removal.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jiyun Kim, Chanju Na, Younghu Son, Mani Prabu, Minyoung Yoon
Summary: Recent technological developments in metal-organic framework (MOF) have achieved selective adsorption and sensing capabilities. Two stilbene-based MOFs, labeled as Zn-3(SDC)(3)(bpy) (1) and Zn(SDC)(bpy)center dot 2DMF (2), were synthesized and used for the adsorptive removal of dye molecules. Despite their lower adsorption capacities, these MOFs exhibited higher selectivity towards cationic dye (methylene blue) compared to anionic dye (methyl orange). The MOFs also demonstrated unique fluorescent properties, making them suitable for the sensitive detection of harmful organic molecules.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Environmental
Gayathri Chellasamy, Shiva Kumar Arumugasamy, Myeong Jin Nam, Sada Venkateswarlu, Elumalai Varathan, Karthikeyan Sekar, Kamaraj Manokaran, Min-Jae Choi, Saravanan Govindaraju, Kyusik Yun
Summary: Single atom catalysts (SACs) with dispersed metal active sites, signal amplification, and acceptable sensitivity and selectivity have played a significant role in biosensing. A recent advancement includes the development of dual-metal single atom catalysts (CuAu SACs/BC) with high metal loading and flexible active sites, enabling enhanced electrochemical activity and biosensing ability. This study presents the fabrication and application of carbon-supported dual-metal single atoms for real-time electrochemical detection of dopamine in cellular environments and biofluids. The bioinspired CuAu SACs/BC-based detection platform showed selective and sensitive detection of nanomolar dopamine and demonstrated potential for real-time electrochemical biosensors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Atanu Panda, Hang-Kyu Cho, Hansang Kim
Summary: Low-cost, sustainable hydrogen production requires noble metal-free electrocatalysts for water splitting. In this study, zeolitic imidazolate frameworks (ZIF) decorated with CoFe2O4 spinel nanoparticles were used as active catalysts for oxygen evolution reaction (OER). The CoFe2O4 nanoparticles were synthesized from agricultural bio-waste (potato peel extract), demonstrating the potential of high-performance noble metal-free electrocatalysts for low-cost, high-efficiency, and sustainable hydrogen production.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Sada Venkateswarlu, Muhammad Umer, Younghu Son, Saravanan Govindaraju, Gayathri Chellasamy, Atanu Panda, Juseong Park, Sohaib Umer, Jeonghyeon Kim, Sang-Il Choi, Kyusik Yun, Minyoung Yoon, Geunsik Lee, Myung Jong Kim
Summary: Green fuel from water splitting is crucial for future generations, however, the limited source of fresh water is a bottleneck. The use of seawater as a feedstock in current electrolyzer techniques is not feasible. Recently, a cobalt single-atom based electrocatalyst was successfully synthesized using waste orange peel as a single feedstock. Experimental results showed that this catalyst exhibited 15 times higher oxygen evolution reaction activity compared to commercial RuO2. Theoretical interpretations suggest that the optimized cobalt single atoms reduce the energy barrier for alkaline water dissociation and trigger excellent oxygen evolution reactions.
Article
Chemistry, Multidisciplinary
Purna Chandra Rao, Yongseok Kim, Hyeonsu Kim, Younghu Son, Yuyeol Choi, Kyungsu Na, Minyoung Yoon
Summary: A new compound called homocyclic methylbenzyl naphthalene (MBN) has been developed as a liquid organic hydrogen carrier (LOHC) medium with a high hydrogen storage capacity of 6.44 wt % and good dehydrogenation ability. The MBN medium has one of the lowest dehydrogenation enthalpies among homocyclic LOHC media, making it an efficient and cost-effective option for practical applications.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Review
Chemistry, Applied
Sada Venkateswarlu, Sowjanya Vallem, Muhammad Umer, N. V. V. Jyothi, Anam Giridhar Babu, Saravanan Govindaraju, Younghu Son, Myung Jong Kim, Minyoung Yoon
Summary: The development of urbanization and industrialization has led to the depletion of fossil fuels and the need for renewable energy production. Electrochemical energy conversion and storage, using materials such as metal-organic frameworks (MOFs) and two-dimensional transition-metal carbides/nitrides (MXenes), have emerged as promising techniques. However, MOFs face challenges in terms of structural stability and electrical conductivity, while MXenes have issues with porosity, redox sites, and agglomeration. To overcome these limitations, researchers have been designing MOF/MXene nanoarchitectures, which show promise in electrochemical energy storage and conversion. This review highlights the design strategies and future opportunities of MOF/MXene nanoarchitectures.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Review
Chemistry, Multidisciplinary
Prabu Mani, Younghu Son, Minyoung Yoon
Summary: Electrocatalysis plays an important role in advanced clean energy production technologies. Traditional electrocatalysts made of noble metals suffer from disadvantages such as low abundance, low surface area, and high cost. Metal-organic frameworks (MOFs) have been explored as alternative electrocatalysts, but their insulating property and poor electrolyte stability limit their utility in desired technologies. New synthetic strategies have enabled the fabrication of electrocatalytically active MOFs for energy and environmental applications. This review discusses the synthetic approaches and recent progress of active MOFs in electrocatalytic applications such as oxygen reduction, oxygen/hydrogen evolution, and carbon dioxide reduction, with the aim of advancing MOF research in emergent technologies.