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P-12.4: ITO-induced biexciton quenching in CdSe colloidal quantum dots

SID Symposium Digest of Technical Papers 2024年第S1期55卷 1353-1354页

作者： Guohong Xiang Jingrui Ma Xiangwei Qu Kai Wang Hoi Sing Kwok Xiao Wei Sun Institute of Nanoscience and Applications and Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen China 518055 State Key Laboratory of Advanced Displays and Optoelectronics Technologies the Hong Kong University of Science and Technology Hong Kong China Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology) Ministry of Education Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices and Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Southern University of Science and Technology Shenzhen China 518055

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Air-liquid microfluidics-integrated surface-enhanced Raman spectroscopy for selective molecular adsorption and detection to achieve bacterial discrimination

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Biosensors and Bioelectronics 2025年 285卷 117576页

作者： Ku, Chi-Yao Chiang, Yu-Wei Hsu, Huai-Yuan Cheng, Ho-Wen Chen, Ko-Lun Han, Yin-Yi Wang, Juen-Kai Wang, Yuh-Lin Huang, Nien-Tsu Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan Molecular Science and Technology Taiwan International Graduate Program Academia Sinica Taipei Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei Taiwan Department of Anesthesiology National Taiwan University Hospital Taipei100229 Taiwan Department of Trauma National Taiwan University Hospital Taipei100229 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei Taiwan Center for Atomic Initiative for New Materials National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

Bacterial discrimination is crucial for accurate microbiological diagnosis and timely antibiotic treatment. Surface-enhanced Raman spectroscopy (SERS) is an ideal technique due to its non-invasive, label-free molecular sensing capabilities. By analyzing bacterial supernatants, containing various purine derivatives, SERS can differentiate bacterial species based on their unique spectral distributions. However, the same bacterial species with different antibiotic resistance may secrete similar purine derivatives, differing only slightly in composition. Furthermore, each purine derivative may have a different molecular affinity to the SERS substrate, making it difficult to distinguish the exact molecular ratio. To improve SERS-based bacterial discrimination, we propose an air-liquid microfluidics-integrated SERS system (ALM-SERS) that selectively adsorbs and detects bacterial secretions. By taking features of precise microdroplet manipulation and contact area from microfluidics and features of selective molecular adsorption and fingerprints characterization from the SERS technique, we successfully perform a "sequential molecular adsorption" strategy to address the signal interference of complicated molecular mixtures in existing SERS methods. As a proof of concept, we first evaluate the molecular affinity of purine derivatives and then demonstrate the competitive analyte adsorption using adenine/cytosine and hypoxanthine/uracil sample mixtures. Finally, we tested six bacterial supernatants, including two Gram types and four strains with identical taxonomy but differing antibiotic resistance. Another six clinically isolated bacterial samples with different antibiotic resistance were also applied. Our results showed that a successful bacterial discrimination between similar species was not possible using a single SERS spectrum. In summary, the ALM-SERS system offers a powerful approach for bacterial discrimination, even when spectral differences are subtle. Beyond microb

关键词： Raman spectroscopy

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Three Dimensional Liquid Metal Light Microrobot

Three Dimensional Liquid Metal Light Microrobot

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IEEE International Conference on Robotics and Biomimetics

作者： Mingyuan Sun Yue Chen Xuanhan Chen Jiangxia Zhou Jie Hu Shiwu Zhang Lining Sun Xiangpeng Li College of Mechanical and Electrical Engineering Soochow University Suzhou China Department of Precision Machinery and Precision Instrumentation CAS key Laboratory of Mechanical Behavior and Design of Materials Univesity of Science and Technology of China Hefei China

ISBN: (纸本)9781665481106

Gallium-based room temperature liquid metal has attracted attention as a new functional material that has emerged in recent years. Its excellent conductivity, mobility and deformability have also led to the exploration of its application in many fields. Many applications are based on the precise control of liquid metals. The commonly used control methods are magnetic field control and electric field control. However, due to the lack of reliable and effective control, only a single liquid metal droplet can be controlled. In this paper, light foam balls are used to modify liquid metal so that they can be traced by electrodes to control movement in three-dimensional space and retain the properties of pure liquid metal. At the same time, several experiments are designed to demonstrate that the lightweight and reconfigurable liquid metal (LRLM) microrobot has excellent motion characteristics and cooperative clustering ability, which greatly expands the application range of liquid metal.

关键词： Graphics Electrodes Drugs Targeted drug delivery Metals Magnetic liquids Magnetic fields

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Correction: Reliable high work-function molybdenum dioxide synthesis via template-effect-utilizing atomic layer deposition for next-generation electrode applications

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Journal of materials Chemistry C 2022年第36期10卷 13268-13269页

作者： Ye Won Kim Ae Jin Lee Dong Hee Han Dae Cheol Lee Ji Hyeon Hwang Youngjin Kim Songyi Moon Taewon Youn Minyung Lee Woojin Jeon Department of Advanced Materials Engineering for Information and Electronics and Integrated Education Program for Frontier Science & Technology (BK21 Four) Kyung Hee University Yongin Gyeonggi 17104 Korea SK Hynix Inc. Icheon Gyeonggi 17336 Korea

Correction for ‘Reliable high work-function molybdenum dioxide synthesis via template-effect-utilizing atomic layer deposition for next-generation electrode applications’ by Ye Won Kim et al., J. Mater. Chem. C, 202...

Correction for ‘Reliable high work-function molybdenum dioxide synthesis via template-effect-utilizing atomic layer deposition for next-generation electrode applications’ by Ye Won Kim et al., J. Mater. Chem. C, 2022, https://***/10.1039/d2tc02104h.

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Interplay of broken symmetry and delocalized excitations in the insulating state of 1T−TaS2

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Physical Review B 2023年第20期108卷 205105-205105页

作者： Xun Jia Anubhab Haldar Jungho Kim Yilin Wang Gilberto Fabbris Karl Ludwig Stefanos Kourtis Mary Upton Yu Liu Wenjian Lu Xuan Luo Yu-Ping Sun Diego Casa Sahar Sharifzadeh Pierre T. Darancet Yue Cao Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA Advanced Photon Source Argonne National Laboratory Lemont Illinois 60439 USA School of Future Technology University of Science and Technology of China Hefei Anhui 230026 China Department of Physics Boston University Boston Massachusetts 02215 USA Division of Materials Science and Engineering Boston University Boston Massachusetts USA Institut quantique & Departement de physique Universite de Sherbrooke Quebec J1K 2R1 Canada Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei 230031 China High Magnetic Laboratory HFIPS Chinese Academy of Sciences Hefei 230031 China Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing 210093 China Center for Nanoscale Materials Argonne National Laboratory Lemont Illinois 60439 USA Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 USA

Coexistence of localized and extended excitations is central to the macroscopic properties of correlated materials. For 5d transition-metal compounds, electron correlations alone generally do not lead to a metal-insulator (Mott) transition, with insulating behavior usually resulting from their coupling with magnetic ordering and/or structural distortions. 1T−TaS2 is a prototypical example of such correlated insulating behavior, with a high-symmetry metallic phase transforming into a distorted, charge-density wave (CDW) insulating state at low temperatures. The nature of the insulating phase as well as the existence and relevance of the localized electron physics remains debated. We resolve this standing controversy in 1T−TaS2 combining resonant inelastic x-ray spectroscopy and first-principles calculations. We observe five electronic excitations arising from the interband transitions of the Ta 5d orbitals and the S 3p ligand state, with none of the excitations on the order of the Mott gap. These excitations cannot be explained within the framework of standard multiplet calculations that assume a localized wave function, but instead, are captured by a band-theory framework accounting for the low symmetry of the crystal field in the CDW state. Our findings suggest that the electronic properties of 1T−TaS2 are dominated in the visible by both plasmonic quasiparticles and interband transitions, with no resonance associated with a putative Mott transition observed in the 0–3 eV energy range. Our discovery provides insights into the electron localization and the Mott vs band-insulator debate in 1T−TaS2 and other transition-metal materials.

关键词： Charge density waves Strongly correlated systems Resonant inelastic x-ray scattering

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Molecular-Scale Visualization of Steric Effects of Ligand Binding to Reconstructed Au(111) Surfaces

arXiv

引用

arXiv 2023年

作者： Bi, Liya Jamnuch, Sasawat Chen, Amanda Do, Alexandria Balto, Krista P. Wang, Zhe Zhu, Qingyi Wang, Yufei Zhang, Yanning Tao, Andrea R. Pascal, Tod A. Figueroa, Joshua S. Li, Shaowei Department of Chemistry and Biochemistry University of California La Jolla San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Department of Nano and Chemical Engineering University of California La Jolla San DiegoCA92093-0448 United States Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu611731 China

Direct imaging of single molecules at nanostructured interfaces is a grand challenge, with potential to enable new, precise material architectures and technologies. Of particular interest are the structural morphology and spectroscopic signatures of the adsorbed molecule, where modern probes are only now being developed with the necessary spatial and energetic resolution to provide detailed information at molecule-surface interface. Here, we directly visualize the binding of individual m-terphenyl isocyanide ligands to a reconstructed Au(111) surface through scanning tunneling microscopy (STM) and inelastic electron tunneling spectroscopy (IETS). The site-dependent steric pressure of the various surface features alters the vibrational fingerprints of the m-terphenyl isocyanides, which is characterized with single-molecule precision through joint experimental and theoretical approaches. This study for the first time provides molecular-level insights into the steric-pressure-enabled surface binding selectivity, as well as its effect on the chemical properties of individual surface-binding ligands. © 2023, CC BY.

关键词： Scanning tunneling microscopy

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High-Capacity Rechargeable Li/Cl2Batteries with Graphite Positive Electrodes

arXiv

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arXiv 2022年

作者： Zhu, Guanzhou Liang, Peng Huang, Cheng-Liang Huang, Cheng-Chia Li, Yuan-Yao Wu, Shu-Chi Li, Jiachen Wang, Feifei Tian, Xin Huang, Wei-Hsiang Jiang, Shi-Kai Hung, Wei-Hsuan Chen, Hui Lin, Meng-Chang Hwang, Bing-Joe Dai, Hongjie Department of Chemistry and Bio-X Stanford University StanfordCA94305 United States Department of Chemical Engineering National Chung Cheng University Chia-Yi62102 Taiwan Department of Electrical Engineering National Chung Cheng University Chia-Yi62102 Taiwan Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Institute of Materials Science and Engineering National Central University Taoyuan City32001 Taiwan College of Electrical Engineering and Automation Shandong University of Science and Technology Shandong Province Qingdao266590 China

Developing new types of high-capacity and high-energy density rechargeable battery is important to future generations of consumer electronics, electric vehicles, and mass energy storage applications. Recently we reported ∼ 3.5 V sodium/chlorine (Na/Cl2) and lithium/chlorine (Li/Cl2) batteries with up to 1200 mAh g-1reversible capacity, using either a Na or Li metal as the negative electrode, an amorphous carbon nanosphere (aCNS) as the positive electrode, and aluminum chloride (AlCl3) dissolved in thionyl chloride (SOCl2) with fluoride-based additives as the electrolyte1. The high surface area and large pore volume of aCNS in the positive electrode facilitated NaCl or LiCl deposition and trapping of Cl2for reversible NaCl/Cl2or LiCl/Cl2redox reactions and battery discharge/charge cycling. Here we report an initially low surface area/porosity graphite (DGr) material as the positive electrode in a Li/Cl2battery, attaining high battery performance after activation in carbon dioxide (CO2) at 1000 °C (DGr-ac) with the first discharge capacity ∼ 1910 mAh g-1and a cycling capacity up to 1200 mAh g-1. Ex situ Raman spectroscopy and X-ray diffraction (XRD) revealed the evolution of graphite over battery cycling, including intercalation/de-intercalation and exfoliation that generated sufficient pores for hosting LiCl/Cl2redox. This work opens up widely available, low-cost graphitic materials for high-capacity alkali metal/Cl2batteries. Lastly, we employed mass spectrometry to probe the Cl2trapped in the graphitic positive electrode, shedding light into the Li/Cl2battery operation. © 2022, CC BY-NC-ND.

关键词： Mass spectrometry

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A DIRECT METHOD OF GENERATING QUADRATIC CURVILINEAR TETRAHEDRAL MESHES USING AN ADVANCING FRONT APPROACH 29

A DIRECT METHOD OF GENERATING QUADRATIC CURVILINEAR TETRAHED...

引用

29th International Meshing Roundtable, IMR 2021

作者： Mohammadi, Fariba Shontz, Suzanne M. Department of Mechanical Engineering Information and Telecommunication Technology Center The University of Kansas 1520 W. 15th Street LawrenceKS66045 United States Department of Electrical Engineering and Computer Science Bioengineering Program Information and Telecommunication Technology Center University of Kansas 1520 W. 15th Street LawrenceKS66045 United States

ISBN: (纸本)9781733489010

Computational modeling and simulation of real-world problems, e.g., various applications in the automotive, aerospace, and biomedical industries, often involve geometric objects which are bounded by curved surfaces. The geometric modeling of such objects can be performed via high-order meshes. Such a mesh, when paired with a high-order partial differential equation (PDE) solver, can realize more accurate solution results with a decreased number of mesh elements (in comparison to a low-order mesh). There are several types of high-order mesh generation approaches, such as direct methods, a posteriori methods, and isogeometric analysis (IGA)-based spline modeling approaches. In this paper, we propose a direct, high-order, curvilinear tetrahedral mesh generation method using an advancing front technique. After generating the mesh, we apply mesh optimization to improve the quality and to take advantage of the degrees of freedom available in the initially straight-sided quadratic elements. Our method aims to generate high-quality tetrahedral mesh elements from various types of boundary representations including the cases where no computer-aided design files are available. Such a method is essential, for example, for generating meshes for various biomedical models where the boundary representation is obtained from medical images instead of CAD files. We present several numerical examples of second-order tetrahedral meshes generated using our method based on input triangular surface meshes. © 2021 held by the authors of the individual papers.

关键词： Mesh generation

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Highly 28Si Enriched Silicon by Localised Focused Ion Beam Implantation

arXiv

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arXiv 2023年

作者： Acharya, Ravi Coke, Maddison Adshead, Mason Li, Kexue Achinuq, Barat Cai, Rongsheng Baset Gholizadeh, A. Jacobs, Janet Boland, Jessica L. Haigh, Sarah J. Moore, Katie L. Jamieson, David N. Curry, Richard J. Department of Electrical and Electronic Engineering Photon Science Institute University of Manchester ManchesterM13 9PL United Kingdom School of Physics University of Melbourne Parkville MelbourneVIC3010 Australia Department of Materials Photon Science Institute University of Manchester ManchesterM13 9PL United Kingdom Department of Materials University of Manchester ManchesterM13 9PL United Kingdom

Solid-state spin qubits within silicon crystals at mK temperatures show great promise in the realisation of a fully scalable quantum computation platform. Qubit coherence times are limited in natural silicon owing to coupling to the isotope 29Si which has a non-zero nuclear spin. This work presents a method for the depletion of 29Si in localised volumes of natural silicon wafers by irradiation using a 45 keV 28Si focused ion beam with fluences above 1 × 1019 ions cm−2. Nanoscale secondary ion mass spectrometry analysis of the irradiated volumes shows unprecedented quality enriched silicon that reaches a minimal residual 29Si value of 2.3 ± 0.7 ppm and with residual C and O comparable to the background concentration in the unimplanted wafer. Transmission electron microscopy lattice images confirm the solid phase epitaxial re-crystallization of the as-implanted amorphous enriched volume extending over 200 nm in depth upon annealing. The ease of fabrication, requiring only commercially available natural silicon wafers and ion sources, opens the possibility for co-integration of qubits in localised highly enriched volumes with control circuitry in the surrounding natural silicon for large-scale devices. Copyright © 2023, The Authors. All rights reserved.

关键词： Silicon wafers

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A new type of compositionally complex M5Si3 silicides: Cation ordering and unexpected phase stability

arXiv

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arXiv 2021年

作者： Shivakumar, Sashank Qin, Mingde Zhang, Dawei Hu, Chongze Yan, Qizhang Luo, Jian Department of NanoEngineering Program of Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

A new type of compositionally complex (medium- or high-entropy) M5Si3 silicides is synthesized. Both (V1/5Cr1/5Nb1/5Ta1/5W1/5)5Si3 and (Ti1/5Zr1/5Nb1/5Mo1/5Hf1/5)5Si3 form single-phase homogenous solid solutions. Notably, (V1/5Cr1/5Nb1/5Ta1/5W1/5)5Si3 forms the hexagonal γ (D88) phase, while all its five constituent binary silicides, V5Si3, Cr5Si3, Nb5Si3, Ta5Si3, and W5Si3, are stable in the tetragonal α (D8l) or β (D8m) phases. Annealing at 1600oC demonstrates that this hexagonal γ phase is stable. Comparison of the experimental and calculated X-ray diffraction patterns, Rietveld refinements, and analysis of aberration-corrected scanning transmission electron microscopy high-angle annular dark-field images suggest cation ordering, which reduces the configurational entropy. This work expands the field of high-entropy and compositional complex ceramics by not only discovering a new compositional complex silicide phase but also demonstrating the cation ordering and unusual phase stability. These compositionally complex silicides can be combined with refractory high-entropy alloys to make the high-entropy counterparts to the Nb-silicide and Mo-Si-B composites. © 2021, CC BY.

关键词： Entropy

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