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In-situ observation of hydrogen nanobubbles formation on graphene surface by AFM-SECM

Electrochimica Acta 2024年 493卷

作者： Kholimatussadiah, Septia Hsu, Chia-Ling Ke, Shang-Wei Chou, Tsu-Chin Wu, Yung-Fu Yakimova, Rositsa Kumatani, Akichika Chen, Kuei-Hsien Chen, Li-Chyong Du, He-Yun Department of Physics National Taiwan University Taipei 10617 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica Taipei 10617 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Institute of Analytical and Environmental Sciences National Tsing Hua University Hsinchu 300044 Taiwan Department of Physics Chemistry and Biology Linköping University SE-581 83 Linköping Sweden Institute of Engineering Innovation School of Engineering The University of Tokyo Tokyo 113-8656 Japan Saitama 332-0012 Japan Tohoku University Sendai980-8577 Japan Battery Research Center of Green Energy Ming Chi University of Technology New Taipei City24301 Taiwan Biochemical Technology R&D Center Ming Chi University of Technology New Taipei City24301 Taiwan Center for Sustainability and Energy Technologies Chang Gung University Taoyuan City33302 Taiwan

Gas bubble evolution is an important phenomenon in many electrochemical processes and it is highly sensitive to the surface properties. Here we visualize the gas bubble dynamics on the surface of different graphene substrates during hydrogen evolution reaction (HER) using atomic force microscopy combined with scanning electrochemical microscopy. The low overpotential and low surface hydrophobicity of few-layer graphene formed on C-phase SiC causes the uniform distribution of hydrogen nanobubbles, which easily depart from the surface during the reaction. Conversely, the high overpotential and more hydrophobic surface of HOPG induces hydrogen bubbles to linger on the surface for an extended duration, leading to its accumulation and the subsequent formation of microbubbles. This in-situ nanoscale electrochemical mapping of hydrogen bubble dynamics provides new insight into electrocatalytic HER that occurs on non-metal electrodes. © 2024 Elsevier Ltd

关键词： Graphene

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Large Optical Modulation of Dielectric Huygens’ Metasurface Absorber

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Advanced Optical Materials 2023年第10期11卷

作者： Cheng, Hao-Yu Ye, Ming-Jyun Chen, Wei-Ruei Yang, Chi-Yin Chu, Shi-Wei Chen, Kuo-Ping Lin, Kung-Hsuan Department of Physics National Taiwan University No. 1 Sec. 4 Roosevelt Rd. Taipei106319 Taiwan Institute of Physics Academia Sinica No. 128 Sec. 2 Academia Rd. Nangang Dist. Taipei City115201 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica No. 128 Sec. 2 Academia Rd. Nangang Dist. Taipei City115201 Taiwan College of Photonics National Yang Ming Chiao Tung University No.301 Sec.2 Gaofa 3rd Rd. Tainan City71150 Taiwan Brain Research Center National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu300044 Taiwan Institute of Photonics Technologies National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu300044 Taiwan

High-index nanostructures are found to exhibit large nonlinearity of spectral responses under photoexcitation, which is applicable to all-optical modulation. The nonlinearity stems from Mie-type resonance shift due to photoinduced variation of refractive index. Here, amorphous silicon-based Huygens’ metasurface absorber and ultrafast excitation are used to demonstrate two orders of magnitude enhancement of modulation depth, both theoretically and experimentally, when electric dipole lattice resonance matches the magnetic dipole resonance. Within a few square micrometer spatial confinement and picosecond scale delay, over 100% photothermal modulation depth is experimentally achieved at matched resonance condition. This concept is not limited to photothermal modulation in the amorphous silicon but is applicable to dielectric materials with various mechanisms to achieve modulation of refractive index. This work opens the avenue toward all-optical information processing via optimized modulation by careful spatiotemporal and spectral control over a metasurface. © 2023 Wiley-VCH GmbH.

关键词： Light modulation

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Tunable spin Hall and spin Nernst effects in Dirac line-node semimetals XCuYAs (X=Zr, Hf;Y=Si, Ge)

arXiv

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arXiv 2020年

作者： Prasad, Babu Baijnath Guo, Guang-Yu Department of Physics and Center for Theoretical Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Physics Division National Center for Theoretical Sciences Hsinchu30013 Taiwan

The quaternary arsenide compounds XCuYAs (X=Zr, Hf;Y= Si, Ge) belong to the vast family of the 1111-type quaternary compounds, which possess outstanding physical properties ranging from p-type transparent semiconductors to high-temperature Fe-based superconductors. In this paper, we study the electronic structure topology, spin Hall effect (SHE) and spin Nernst effect (SNE) in these compounds based on density functional theory calculations. First we find that the four considered compounds are Dirac semimetals with the nonsymmorphic symmetry-protected Dirac line nodes along the Brillouin zone boundary A-M and X-R and low density of states (DOS) near the Fermi level (EF). Second, the intrinsic SHE and SNE in some of these considered compounds are found to be large. In particular, the calculated spin Hall conductivity (SHC) of HfCuGeAs is as large as -514 (h/e)(S/cm). The spin Nernst conductivity (SNC) of HfCuGeAs at room temperature is also large, being -0.73 (h/e)(A/m-K). Moreover, both the magnitude and sign of the SHC and SNC in these compounds can be manipulated by varying either the applied electric field direction or spin current direction. The SHE and SNE in these compounds can also be enhanced by tuning the Fermi level via chemical doping or electric gating. Finally, a detailed analysis of the band-decomposed and k-resolved spin Berry curvatures reveals that these large SHC and SNC as well as their notable tunabilities originate largely from the presence of a large number of spin-orbit coupling-gapped Dirac points near the Fermi level as well as the gapless Dirac line-nodes, which give rise to large spin Berry curvatures. Our findings thus suggest that the four XCuYAs compounds not only provide a valuable platform for exploring the interplay between SHE, SNE and band topology but also have promising applications in spintronics and spin caloritronics. Copyright © 2020, The Authors. All rights reserved.

关键词： Density functional theory

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Enhanced CO 2 photoreduction to CH 4 via *COOH and *CHO intermediates stabilization by synergistic effect of implanted P and S vacancy in thin-film SnS 2

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nano Energy 2024年 128卷

作者： Tadios Tesfaye Mamo Mohammad Qorbani Adane Gebresilassie Hailemariam Raghunath Putikam Che-Men Chu Ting-Rong Ko Amr Sabbah Chih-Yang Huang Septia Kholimatussadiah Tadesse Billo Mahmoud Kamal Hussien Shuo-Yun Chang Ming-Chang Lin Wei-Yen Woon Heng-Liang Wu Ken-Tsung Wong Li-Chyong Chen Kuei-Hsien Chen Department of Chemistry National Taiwan University Taipei 10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan Sustainable Chemical Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan Institute of Chemistry Academia Sinica Taipei 11529 Taiwan Department of Chemistry College of Natural Science Dire Dawa University Dire Dawa 1362 Ethiopia Department of Physics National Central University Jungli 32054 Taiwan Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo 11421 Egypt International Graduate Program of Molecular Science and Technology National Taiwan University Taipei 10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan Materials Science Division Argonne National Laboratory 9700 S. Cass Avenue Lemont IL 60439 United States Department of Chemistry Faculty of Science Assiut University Assiut 71516 Egypt Department of Chemistry National Taiwan Normal University Taipei 10610 Taiwan National Synchrotron Radiation Research Center Hsinchu 30092 Taiwan

Reduction of CO 2 to value-added hydrocarbons through artificial photosynthesis is one of the way to address the energy crisis and climate change issues. It is known that lowering the activation energy of CO 2 molecules on the photocatalyst surface and key intermediates is crucial in photocatalytic CO 2 reduction. Herein, we present phosphorus-implanted 20-nm SnS 2 continuous thin film with sulfur vacancies ( i.e. , S V -SnS 2 :P where P substitutes on S sites). The fabrication process involves thermal evaporation, post-sulfurization, and ion implantation. Our gas-phase photocatalytic experiments show an enhanced and selective CO 2 photoreduction to CH 4 with a yield of 0.13 µmol cm −2 and selectivity of 92 % under solar-light irradiation for 4 h over an optimal ∼4.5 % P and ∼16 % S V . Experimental observations, conducted through X-ray absorption near edge, in situ near ambient pressure X-ray photoelectron, and in situ Fourier transform infrared spectroscopies, along with first-principle density functional theory calculations. Results reveal that P dopant is significantly affected by nearby S V via local charge density transfer from P to the nearest Sn and next-nearest S neighbor atoms, consequently, leads to the stabilization of *COOH and *CHO intermediates, where asterisks stand for P as the active site. Our results demonstrate how active site modulation, without using precious co-catalysts, plays a crucial role in intermediate stabilization in a wireless photocatalysis process.

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The unseen invaders: Tracking phylogeographic dynamics and genetic diversity of cryptic Pomacea canaliculata and P. maculata (Golden apple snails) across Taiwan

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Ecology and Evolution 2024年第4期14卷 e11268页

作者： Banerjee, Pritam Dey, Gobinda Maity, Jyoti Prakash Stewart, Kathryn A. Sharma, Raju Kumar Chan, Michael W. Y. Lee, Kuanhsuen Chen, Chien-Yen Department of Environmental Science Policy and Management University of California Berkeley CA United States Department of Biomedical Sciences Graduate Institute of Molecular Biology National Chung Cheng University Chiayi County Min-Hsiung Taiwan Department of Agricultural Chemistry National Taiwan University Taipei Taiwan Environmental Science Laboratory Department of Chemistry Biological Laboratory School of Applied Sciences KIIT Deemed to be University Odisha Bhubaneswar India Institute of Environmental Sciences Leiden University Leiden Netherlands Doctoral Program in Science Technology Environment and Mathematics Department of Earth and Environmental Sciences National Chung Cheng University Chiayi County Min-Hsiung Taiwan Department of Earth and Environmental Sciences National Chung Cheng University Chiayi County Min-Hsiung Taiwan Department of Emergency Medicine Ditmanson Medical Foundation Chia-Yi Christian Hospital Chiayi Taiwan Center for Nano Bio-Detection Center for Innovative Research on Aging Society AIM-HI National Chung Cheng University Chiayi Taiwan

The cryptic invasion of golden apple snails (Pomacea canaliculata and P. maculata) in Taiwan has caused significant ecological and economical damage over the last few decades, however, their management remains difficult due to inadequate taxonomic identification, complex phylogeny, and limited population genetic information. We aim to understand the current distribution, putative population of origin, genetic diversity, and potential path of cryptic invasion of Pomacea canaliculata and P. maculata across Taiwan to aid in improved mitigation approaches. The present investigation conducted a nationwide survey with 254 samples collected from 41 locations in 14 counties or cities across Taiwan. We identified P. canaliculata and P. maculata based on mitochondrial COI and compared their genetic diversity across Taiwan, as well as other introduced and native countries (based on publicly available COI data) to understand the possible paths of invasion to Taiwan. Based on mitochondrial COI barcoding, sympatric and heterogeneous distributions of invasive P. canaliculata and P. maculata were noted. Our haplotype analysis and mismatch distribution results suggested multiple introductions of P. canaliculata in Taiwan was likely originated directly from Argentina, whereas P. maculata was probably introduced from a single, or a few, introduction event(s) from Argentina and Brazil. Our population genetic data further demonstrated a higher haplotype and genetic diversity for P. canaliculata and P. maculata in Taiwan compared to other introduced regions. Based on our current understanding, the establishment of P. canaliculata and P. maculata is alarming and widespread beyond geopolitical borders, requiring a concerted and expedited national and international invasive species mitigation program. © 2024 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

关键词： agricultural pest biological invasion DNA barcoding golden apple snails mitochondrial COI Pomacea population genetics

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Design and synthesis of a tripodal receptor for the selective detection of Fe 3+

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Materials Today: Proceedings 2020年 33卷 2139-2143页

作者： R. Tamil Selvan G. Tamil Selvan Chitra Varadaraju Israel V.M.V. Enoch P. Mosae Selvakumar Department of Nano Science and Technology KITS Coimbatore Tamil Nadu 641114 India Department of Chemistry KITS Coimbatore Tamil Nadu 641114 India Department of Chemistry St. Joseph’s College for Women Tirupur 641 604 India Science and Math Program Asian University for Women Chittagong-4000 Bangladesh

The tripodal receptor ( Ty ) was synthesized from naphthol and tren units. The metal ion recognition property of the tripodal receptor Ty was analysed using UV–Visible and fluorescence techniques. The structure of Ty receptor is confirmed by FT-IR and NMR spectral data. The Elemental and surface morphology were determined by EDAX and SEM analysis. Fluorescence analysis revealed a positive selectivity towards Fe 3+ ions, in minimal conditions. The receptor Ty selectively recognizes Fe 3+ ions through fluorescence switch-on process in which a bright green luminescence was observed on binding with Fe 3+ ions. Further, the binding stoichiometry for [ Ty -Fe 3+ ] exhibited 1:1 ratio and the binding constant value was found to be 5.1127 × 10 6 M −1 .

关键词： Tripodal receptor Molecular recognition Fe 3+ sensor Fluorescent chemosensor

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Response to "Comment on 'A novel two-dimensional boron-carbon-nitride (BCN) monolayer: A first-principles insight [J. Appl. Phys. 2021, 130, 114301]'"

arXiv

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arXiv 2022年

作者： Bafekry, Asadollah Naseri, Mosayeb Fadlallah, Mohamed M. Sarsari, Ismaeil Abdolhosseini Faraji, Mehrdad Khatibani, Abbas bagheri Ghergherehchi, Mitra Gogova, Daniela Department of Radiation Application Shahid Beheshti University Tehran*** Iran Department of Physics Kermanshah Branch Islamic Azad University Kermanshah*** Iran Department of Physics Faculty of Science Benha University Benha13518 Egypt Department of Physics Isfahan University of Technology Isfahan84156-83111 Iran Micro and Nanotechnology Graduate Program TOBB University of Economics and Technology Sogutozu Caddesi No 43 Sogutozu Ankara06560 Turkey Nano Research Lab Lahijan Branch Islamic Azad University Lahijan1616 Iran Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of Department of Physics Chemistry and Biology Linkoping University Linköping581 83 Sweden

Mortazavi et al. comment on the results of our paper "A novel two-dimensional boron-carbon-nitride BCN monolayer: A First-principles insight," in which we have considered different configurations of BCN. For clarification, we applied the fingerprint theory [1-3] to examine the similarity between the distinct structures. The fingerprint function is a crystal structure descriptor, an 1D-function related to the pair correlation function and diffraction patterns. It does not depend on absolute atomic coordinates, but only on interatomic distances. Small deviations in atomic positions will influence the fingerprints only slightly [1-3]. Fingerprint theory allows quantification of the degree of order and complexity of a crystal structure. © 2022, CC BY.

关键词： Monolayers

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Physical and toxicological profiles of human IAPP amyloids and plaques

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science Bulletin 2019年第1期64卷 26-35页

作者： Aleksandr Kakinen Yunxiang Sun Ibrahim Javed Ava Faridi Emily H.Pilkington Pouya Faridi Anthony W.Purcell Ruhong Zhou Feng Ding Sijie Lin Pu Chun Ke Thomas P.Davis ARC Centre of Excellence in Convergent Bio-Nano Science and Technology Monash Institute of Pharmaceutical Sciences Monash University Department of Physics and Astronomy Clemson University College of Environmental Science and Engineering Shanghai Institute of Pollution Control and Ecological Security Biomedical Multidisciplinary Innovation Research Institute Shanghai East Hospital Tongji University Infection and Immunity Program & Department of Biochemistry and Molecular Biology Biomedicine Discovery Institute Monash University IBM Thomas J.Watson Research Center Department of Chemistry Columbia University

Although much has been learned about the fibrillization kinetics, structure and toxicity of amyloid proteins, the properties of amyloid fibrils beyond the saturation phase are often perceived as chemically and biologically inert, despite evidence suggesting otherwise. To fill this knowledge gap, we examined the physical and biological characteristics of human islet amyloid polypeptide(IAPP) fibrils that were aged up to two months. Not only did aging decrease the toxicity of IAPP fibrils, but the fibrils also sequestered fresh IAPP and suppressed their toxicity in an embryonic zebrafish model. The mechanical properties of IAPP fibrils in different aging stages were probed by atomic force microscopy and sonication, which displayed comparable stiffness but age-dependent fragmentation, followed by self-assembly of such fragments into the largest lamellar amyloid structures reported to date. The dynamic structural and toxicity profiles of amyloid fibrils and plaques suggest that they play active, long-term roles in cell degeneration and may be a therapeutic target for amyloid diseases.

关键词： IAPP Amyloid Plaque Self assembly Toxicity

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Characterization of halotolerant phosphate-solubilizing rhizospheric bacteria from mangrove (Avicennia sp.) with biotechnological potential in agriculture and pollution mitigation

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Biocatalysis and Agricultural Biotechnology 2024年 55卷

作者： Dey, Gobinda Maity, Jyoti Prakash Banerjee, Pritam Sharma, Raju Kumar Etesami, Hassan Bastia, Tapan Kumar Rath, Prasanta Sukul, Uttara Huang, Hsien-Bin Huang, Kuo-Wei Chen, Chien-Yen Department of Agricultural Chemistry National Taiwan University Taipei 106319 Taiwan Department of Biomedical Sciences Graduate Institute of Molecular Biology National Chung Cheng University 168 University Road Chiayi County Ming-Shung 62102 Taiwan Doctoral Program in Science Technology Environment and Mathematics Department of Earth and Environmental Sciences National Chung Cheng University 168 University Rd. Chiayi County Min-Hsiung 62102 Taiwan Environmental Science Laboratory Department of Chemistry Biological Laboratory School of Applied Sciences KIIT Deemed to Be University Odisha Bhubaneswar 751024 India Department of Environmental Science Policy and Management University of California Berkeley CA United States Department of Chemistry and Biochemistry National Chung Cheng University 168 University Road Chiayi County Min-Hsiung 62102 Taiwan Department of Soil Science University of Tehran Tehran 31587-77871 Iran Environmental Science Laboratory Department of Chemistry School of Applied Sciences KIIT Deemed to Be University Odisha Bhubaneswar 751024 India Department of Otolaryngology Ditmanson Medical Foundation Chia-Yi Christian Hospital Taiwan Center for Nano Bio-Detection Center for Innovative Research on Aging Society AIM-HI National Chung Cheng University Chiayi 62102 Taiwan

Mangroves represent intricate and ever-changing ecosystems, exhibiting fluctuations in water level, salinity, and nutrient (such as NPK) availability as well as a wide array of unique bacterial communities. Microbial interactions in different components (e.g., tree roots) of the mangrove ecosystem are crucial to understand the ecosystem functioning for potential application in pollution mitigation and agricultural production. This study aimed to isolate phosphate-solubilizing bacteria (PSB) from the rhizosphere sediment of mangrove (Avicennia sp.) in terms of heavy metals (HMs) and salinity tolerance as well as plant growth promoting (PGP) traits, where the effective PSB were used on Brassica chinensis for their seed priming and growth under salinity stress. The effective two PSB isolates were identified by 16S rRNA, where JKD01 and JKD02 were closely related (99%) to Enterobacter cloacae (OQ271412) and Kocuria rhizophila (OQ271413), respectively. Both the strains exhibited phosphate solubilization, IAA, NH_3, and EPS production ability as well as HMs resistant ability where, E. cloacae (OQ271412) and K. rhizophila (OQ271413), are effectively remove the Cu from the water with 33.23% and 27.54%, respectively. The FTIR results showed functional group shifts (carboxyl, phosphate, and amino) in Cu-treated bacterial biomass and intracellular Cu presence, indicating the involvement of Cu in the bio-sorption and intracellular bioaccumulation process, respectively. The findings suggested PSB tolerance to salinity and HMs are present in mangroves, making them a valuable source for isolating effective bacteria to reduce stress in plants, lower HMs accumulation in mangroves, and aid in the bioremediation of HMs-contaminated environments. © 2023

关键词： Bio-priming Copper remediation Heavy metal tolerant Mangrove Phosphate-solubilizing bacteria Salt tolerant

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Cobalt copper alloys encapsulated by MOS2/N-doped graphene nano-heterostructures for orr application 22

Cobalt copper alloys encapsulated by MOS2/N-doped graphene n...

引用

22nd International Conference on Composite Materials, ICCM 2019

作者： Nguyen, D.C. Tran, D.T. Lee, Y.S. Kim, N.H. Lee, J.H. Advanced Materials Institute for BIN Convergence Technology BK21 Plus Global Program Department of BIN Convergence Technology Chonbuk National University Jeonju Jeonbuk54896 Korea Republic of Carbon Composite Research Center Department of Polymer-Nano Science and Technology Chonbuk National University Jeonju Jeonbuk54896 Korea Republic of

In this work, a hybrid containing cobalt-copper alloys encapsulated 2D-molybdenum disulfide/nitrogen-doped graphene (CuCo@2D-MoS2/N-Gr) is synthesized by a simple thermal treatment and investigated as a catalyst for oxygen reduction reaction (ORR) in alkaline solution. Benefiting from the large electrochemical surface area of 2D-MoS2 and Gr, the highly electrical conductivity of Gr, good synergetic effects between Cu and Co, good contact between MoS2 and N-Gr, and N-doing effect, the resulting CuCo@2D-MoS2/N-Gr hybrid exhibits high catalytic performance for ORR with positive onset (0.96 V), high current density (-6 ***-2), superior stability, and good methanol tolerance compared to the commercial Pt/C catalyst. The CuCo@2D-MoS2/N-Gr hybrid is expected as a promising catalyst material for fuel cell applications. © 2019 International Committee on Composite Materials. All rights reserved.

关键词： Electrocatalysts

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