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Selective activation of MoS2 grain boundaries for enhanced electrochemical activity

Nanoscale Horizons 2024年第6期9卷 946-955页

作者： Raman, Radha Muthu, Jeyavelan Yen, Zhi-Long Qorbani, Mohammad Chen, Yu-Xiang Chen, Ding-Rui Hofmann, Mario Hsieh, Ya-Ping Department of Physics National Central University Taoyuan32001 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei115 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan

Molybdenum disulfide (MoS2) has emerged as a promising material for catalysis and sustainable energy conversion. However, the inertness of its basal plane to electrochemical reactions poses challenges to the utilization of wafer-scale MoS2 in electrocatalysis. To overcome this limitation, we present a technique that enhances the catalytic activity of continuous MoS2 by preferentially activating its buried grain boundaries (GBs). Through mild UV irradiation, a significant enhancement in GB activity was observed that approaches the values for MoS2 edges, as confirmed by a site-selective photo-deposition technique and micro-electrochemical hydrogen evolution reaction (HER) measurements. Combined spectroscopic characterization and ab-initio simulation demonstrates substitutional oxygen functionalization at the grain boundaries to be the origin of this selective catalytic enhancement by an order of magnitude. Our approach not only improves the density of active sites in MoS2 catalytic processes but yields a new photocatalytic conversion process. By exploiting the difference in electronic structure between activated GBs and the basal plane, homo-compositional junctions were realized that improve the photocatalytic synthesis of hydrogen by 47% and achieve performances beyond the capabilities of other catalytic sites. © 2024 The Royal Society of Chemistry

关键词： Electronic structure

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One-step flow synthesis of size-controlled polymer nanogels in a fluorocarbon microfluidic chip

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RSC Advances 2024年第16期14卷 11258-11265页

作者： Montalbo, Reynaldo Carlos K. Wu, Meng-Jie Tu, Hsiung-Lin Institute of Chemistry Academia Sinica Taipei11529 Taiwan Nanoscience and Technology Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing-Hua University Hsinchu300044 Taiwan Department of Chemistry National Cheng-Kung University Tainan70101 Taiwan Genome and Systems Biology Degree Program Academia Sinica and National Taiwan University Taiwan

Synthetic polymer nanoparticles (NPs) with biomimetic properties are ideally suited for different biomedical applications such as drug delivery and direct therapy. However, bulk synthetic approaches can suffer from poor reproducibility and scalability when precise size control or multi-step procedures are required. Herein, we report an integrated microfluidic chip for the synthesis of polymer NPs. The chip could sequentially perform homopolymer synthesis and subsequent crosslinking into NPs without intermediate purification. This was made possible by fabrication of the chip with a fluorinated elastomer and incorporation of two microfluidic mixers. The first was a long channel with passive mixing features for the aqueous RAFT synthesis of stimuli-responsive polymers in ambient conditions. The polymers were then directly fed into a hydrodynamic flow focusing (HFF) junction that rapidly mixed them with a crosslinker solution to produce NPs. Compared to microfluidic systems made of PDMS or glass, our chip had better compatibility and facile fabrication. The polymers were synthesized with high monomer conversion and the NP size was found to be influenced by the flow rate ratio between the crosslinker solution and polymer solution. This allowed for the size to be predictably controlled by careful adjustment of the fluid flow rates. The size of the NPs and their stimuli-responses were studied using DLS and SEM imaging. This microfluidic chip design can potentially streamline and provide some automation for the bottom-up synthesis of polymer NPs while offering on-demand size control. © 2024 The Royal Society of Chemistry.

关键词： Microfluidic chips

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A double transition metal Ti_(2)NbC_(2)T_(x) MXene for enhanced lithium-ion storage

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Rare Metals 2023年第1期42卷 100-110页

作者： Wei Liu Jin Cao Feng Song Dong-Dong Zhang Manunya Okhawilai Jin Yi Jia-Qian Qin Xin-Yu Zhang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004China International Graduate Program of Nanoscience&Technology Chulalongkorn UniversityBangkok10330Thailand Metallurgy and Materials Science Research Institute Chulalongkorn UniversityBangkok10330Thailand Center of Excellence in Responsive Wearable Materials Chulalongkorn UniversityBangkok10330Thailand Institute for Sustainable Energy College of SciencesShanghai UniversityShanghai200444China

MXene,an emerging two-dimensional(2D)layered material,has received worldwide attention in various energy storage systems because of its excellent ***,the low capacity of pristine MXene restricts its application in energy storage devices especially for the lithium-ion batteries(LIBs).To address the above issue,herein,a stable and highly conductive double transition metal MXene(Ti_(2)NbC_(2)T_(x)) is successfully fabricated,which provides enlarged interlayer spacing and excellent conductivity for fast ion diffusion and charge *** the Ti_(2)NbC_(2)T_(x)s anode for LIBs,a superior specific capacity of 196.2 mAh·g-1and an excellent long-term cycling stability of~100%after 400cycles under 0.1 A·g^(-1) are achieved for *** particular,Ti_(2)NbC_(2)T_(x) delivers an impressive capacity retention of 81%over 4000 cycle under 1 A·g^(-1),outperforming the Ti_(3)C_(2)T_(x) and various previously reported MXene-based *** results offer an attractive strategy for the future application of MXene-based materials.

关键词： Double transition metal MXene Ti_(2)NbC_(2)T_(x) Ti_(3)C_(2)T_(x) Lithium-ion batteries(LIBs) Anode

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Novel photocatalytic coating for corrosion mitigation in 304LSS of dry storage canisters

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Frontiers in Materials 2023年 10卷

作者： Sathasivam, Kamalasekaran Wang, Mei-Ya Anbalagan, Aswin kumar Lee, Chih-Hao Yeh, Tsung-Kuang Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Nuclear Science and Technology Development Center National Tsing Hua University Hsinchu Taiwan Institute of Nuclear Engineering and Science National Tsing Hua University Hsinchu Taiwan

Type 304L stainless steel (304LSS) is one of the candidate canister materials for storing radioactive spent fuels, usually near seashore environments along with nuclear power plants. During the prolonged exposure of dry storage canisters to saline environments, they are highly susceptible to chloride induced stress corrosion cracking. Failure of a dry storage canister not only would release radioactive isotopes into the environment, but would also lead to a costly replacement of the cracked canister. The objective of this study is to develop a multilayered titanium dioxide (TiO2) composite coating on a 304LSS substrate. With ultraviolet (UV) illumination, this coating would act as a barrier and simultaneously offer cathodic protection against corrosion in the substrate alloy. The composite coating consists of a plain amorphous TiO2 coating over another cerium-doped (Ce-doped) TiO2 coating. Electronic currents generated by photo-catalytic reaction of the amorphous TiO2 coating under UV illumination were measured. Photo-electrochemical analyses and surface morphology observations were conducted to evaluate the performance of the Ce-doped coatings on corrosion mitigation. Optimal amounts of cerium doping that offered better photo-cathodic protection were also explored. Results indicated that the Ce-doped TiO2 coating exhibited a better performance on photo-cathodic protection for 304L stainless steel in aerated 3.5% NaCl solutions than the one without cerium doping. The underlying Ce-doped TiO2 coating was effectively charged during UV illumination, and it was able to continuously release electrons even after the UV was switched off, thus providing uninterrupted photo-cathodic protection for the coated 304L stainless steel substrate. Copyright © 2023 Sathasivam, Wang, Anbalagan, Lee and Yeh.

关键词： Titanium dioxide

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Angle-free random laser enabled efficient photocatalytic degradation of Rhodamine 6G molecules

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APL Materials 2023年第11期11卷 111111-111111页

作者： You, Jheng-Syun Hou, Cheng-Fu Chao, Yu-Chieh Tsao, Yu-Chuan Feria, Denice N. Lin, Tai-Yuan Chen, Yang-Fang Department of Physics National Taiwan University Taipei10617 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei115201 Taiwan Department of Optoelectronics and Materials Technology National Taiwan Ocean University Keelung City202301 Taiwan Center for Emerging Material and Advanced Devices National Taiwan University Taipei10617 Taiwan

Efficient photocatalytic dye degradation has been realized based on the first attempt of using a random laser. In previous studies, most photocatalytic dye degradation was conducted by using broad-angular emission lamps, light-emitting diodes, and conventional lasers. However, these types of light sources could be restricted by some disadvantages, such as weak intensity or high directionality. Unlike traditional lasers, random lasers obviate the need for the cavity. The advantage of broad-angular emission lights and the feature of laser-level intensity make random lasers a promising light source for many potential applications. In this study, an ultraviolet random laser (UVRL) derived from zinc oxide (ZnO) was used in the photocatalytic dye degradation experiment. It is found that the degradation efficiency of the UVRL is much better than that of conventional lasers and ultraviolet light-emitting diodes. The success of applying random laser systems in the photocatalytic reaction is expected to expand the applications of random lasers. © 2023 Author(s).

关键词： II-VI semiconductors

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Developments in the utilization of heterogeneous catalysts for biodiesel generation: An update on recent advancements

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Journal of the Taiwan Institute of Chemical Engineers 2024年

作者： Parameshwar, Sai Agnihotri, Mayank Bhan, Uday Nangan, Senthilkumar Verma, Deepak Rajendran, Saravanan Jain, Siddharth Department of Petroleum Engineering and Earth Sciences UPES Dehradun248007 India Metallurgy and Materials Science Research Institute Chulalongkorn University Bangkok10330 Thailand International Graduate Program of Nanoscience and Technology Chulalongkorn University Bangkok10330 Thailand Instituto de Alta Investigacion Universidad de Tarapacá Arica1000000 Chile Department of Mechanical Engineering UPES Dehradun248007 India

Background: Biodiesel is one of the ecofriendly energy sources that can be generated from edible, non-edible, waste, and algae feedstocks. Over time, the utilization of different kinds of heterogeneous catalysts has been proven critical in the manufacture of biodiesel from diverse feedstocks. They exhibit better reusability and easier separation compared to the homogenous catalysts. Methods: In this work, the advances in the use of heterogeneous catalysts for biodiesel production from 2018 to 2024 have been evaluated. The process parameters like alcohol to oil molar ratio (M/O), catalyst concentration (%), reaction time and reaction temperature (RT), reusability of the catalyst, etc. are evaluated. The catalysts derived from waste materials through the calcination process are an efficient and cost-effective substitute for conventional catalysts. Nanomaterials, due to their small size and higher aspect ratio, provide very high efficiency and reusability in catalytic reactions. Significant findings: The heterogeneous catalysts are also found to be highly reusable for multiple cycles and the leaching of active sites, clogging of pore spaces of catalyst, etc. are the major causes of catalyst deactivation. Magnetic heterogeneous catalysts have shown good biodiesel yields and high reusability. Also, naturally occurring calcium oxide and potassium compounds present in waste derived catalysts helped to give high biodiesel yields. The future direction in the path of development of heterogeneous catalysts from cheap, abundant, and environmentally benign materials. The synthesis of heterogeneous catalysts from waste materials addresses the issue of waste disposal and converting solid waste to value-added catalysts. The life cycle assessment studies, encompassing heterogeneous catalyst synthesis, feedstock oil extraction, biodiesel production, and fuel combustion may give valuable input on the environmental impact of the entire process. © 2024

关键词： Potassium compounds

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Micropatterning of functional lipid bilayer assays for quantitative bioanalysis

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Biomicrofluidics 2023年第3期17卷 031302页

作者： Montalbo, Reynaldo Carlos K. Tu, Hsiung-Lin Institute of Chemistry Academia Sinica Taipei11529 Taiwan Nanoscience and Technology Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing-Hua University Hsinchu300044 Taiwan Genome and Systems Biology Degree Program Academia Sinica National Taiwan University Taipei10617 Taiwan

Interactions of the cell with its environment are mediated by the cell membrane and membrane-localized molecules. Supported lipid bilayers have enabled the recapitulation of the basic properties of cell membranes and have been broadly used to further our understanding of cellular behavior. Coupled with micropatterning techniques, lipid bilayer platforms have allowed for high throughput assays capable of performing quantitative analysis at a high spatiotemporal resolution. Here, an overview of the current methods of the lipid membrane patterning is presented. The fabrication and pattern characteristics are briefly described to present an idea of the quality and notable features of the methods, their utilizations for quantitative bioanalysis, as well as to highlight possible directions for the advanced micropatterning lipid membrane assays. © 2023 Author(s).

关键词： Lipid bilayers

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Correction: Comparative study on formic acid sensing properties of flame-made Zn2SnO4 nanoparticles and its parent metal oxides

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Physical Chemistry Chemical Physics 2023年第27期25卷 18497-18498页

作者： Matawee Punginsang Kanittha Inyawilert Mameaseng Siriwalai Anurat Wisitsoraat Adisorn Tuantranont Chaikarn Liewhiran Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand PhD Program in Nanoscience and Nanotechnology (International Program/Interdisciplinary) Faculty of Science Chiang Mai University Chiang Mai Thailand Graduate School Chiang Mai University Chiang Mai Thailand Center of Excellence in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand National Security and Dual-Use Technology Center National Science and Technology Development Agency (NSTDA) Klong Luang Phathum Thani 12120 Thailand

Correction for ‘Comparative study on formic acid sensing properties of flame-made Zn2SnO4 nanoparticles and its parent metal oxides’ by Matawee Punginsang et al., Phys. Chem. Chem. Phys., 2023, 25, 15407–15421, htt...

Correction for ‘Comparative study on formic acid sensing properties of flame-made Zn₂SnO₄ nanoparticles and its parent metal oxides’ by Matawee Punginsang et al., Phys. Chem. Chem. Phys., 2023, 25, 15407–15421, https://***/10.1039/D3CP00845B.

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Deep ultraviolet random laser disinfection

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Optics and Laser technology 2024年 170卷

作者： Hou, Chengfu Kuo, Minju Lin, Peihsuan Wu, Mengjer Huang, Chihching Lin, Taiyuan Chen, Yangfang Department of Physics National Taiwan University Taipei10617 Taiwan Department of Optoelectric Physics Chinese Culture University Taipei11114 Taiwan Department of Optoelectronics and Materials Technology National Taiwan Ocean University Keelung City202301 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei115201 Taiwan Department of Bioscience and Biotechnology National Taiwan Ocean University Keelung202301 Taiwan Center of Excellence for the Oceans National Taiwan Ocean University Keelung202301 Taiwan School of Pharmacy College of Pharmacy Kaohsiung Medical University Kaohsiung80708 Taiwan Center for Emerging Material and Advanced Devices National Taiwan University Taipei10617 Taiwan

Recently, the ineffectiveness of conventional antibiotic treatments against multidrug-resistant bacteria stimulated the development of novel effective disinfection technologies. Ultraviolet lasers, with several features, including high coherence, high directionality, monochromatic, and high intensity, were the ideal candidate light source for disinfection;however, conventional lasers are restricted by their inherent detriments such as high directionality, meticulous manufacturing, and the laser speckles. Random lasers have been considered powerful candidates for illumination sources due to their angle-free emission in recent years. However, their practical application remains scarce, and the result of using a deep ultraviolet random laser (DUV-RL) for disinfection has not ever been reported. Herein, the DUV-RL is realized by applying AlGaN multiple quantum wells (MQWs) and aluminum nanoparticles as the gain medium and plasmonic scattering centers. The proof of concept for the first DUV-RL disinfection in our study is examined by implementing this unique light source on model gram-negative bacteria (Escherichia coli). Additionally, the inherent angle-free emission characteristic of random lasers was confirmed and applied in treatment to achieve angle-free disinfection, which enables random lasers to overcome the major drawback of the high directionality of conventional lasers. Above all, the success of applying random laser systems in the disinfection arena fulfills the empty piece of current laser treatment. This research is expected to promote the development of DUV-RLs and enable them to compete with other light sources, such as mercury lamps and Ultraviolet-C (UVC) LEDs, in the near future. © 2023 Elsevier Ltd

关键词： Aluminum gallium nitride

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Mini Light-Emitting Diode technology with High Quantum Efficient NIR-II Partially Inverse Spinel MgGa2O4:Cr3+,Ni2+ Nanophosphors

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Advanced Optical Materials 2024年第19期12卷

作者： Satpathy, Aishwarya Huang, Wen-Tse Liu, Tzu-Hsuan Su, Ting-Yi Zhang, Wei Kamiński, Mikolaj Grzegorczyk, Maciej Chen, Jia-Hao Cherng, Ding-Hua Lu, Kuang-Mao Chen, Xueyuan Mahlik, Sebastian Liu, Ru-Shi Department of Chemistry National Taiwan University Taipei106 Taiwan Fujian Key Laboratory of Nanomaterials and CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Academia Road 128 Taipei Nankang115 Taiwan Institute of Experimental Physics Faculty of Mathematics Physics and Informatics University of Gdańsk Wita Stwosza 57 Gdańsk80–308 Poland Everlight Electronics Co. Ltd. New Taipei City238 Taiwan International Centre for Theory of Quantum Technologies University of Gdańsk Gdańsk80–308 Poland

The increasing demand for second near-infrared (NIR-II) region materials, which retain the advantage of minimal scattering and immense applications in the medical and NIR spectroscopy field, has led to considerable research in this region. A mini light-emitting diode (mini-LED) is essential for backlighting liquid crystal displays, indicating the need for the small size of phosphors. However, current market phosphors must be more significant to be a viable option for mini-LEDs. This scenario necessitates the synthesis of small-sized phosphors to be used in mini-LEDs. In this work, a mesoporous silica nanoparticle (MSN) and incorporated the Mg1−yGa2−xO4:xCr3+,yNi2+ system is fabricated. The structural investigation confirmed the single phase of MgGa2O4 with a pore size of 2.73 nm for the MSN. The results showed a steady NIR-II signal at 1270 nm and an enhanced energy transfer with a high quantum yield of 79.2% for a nanophosphor. The mini-LED package revealed a 1000–1600 nm signal, qualifying the nanophosphor for realistic applications. This work can make provisions for various NIR-II nanophosphors in the LED industry. © 2024 Wiley-VCH GmbH.

关键词： Energy transfer

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