检索结果-内蒙古大学图书馆

Ultrafast carrier dynamics and layer-dependent carrier recombination rate in InSe

nanoscale 2023年第7期15卷 3169-3176页

作者： Wu, Ting-Hsuan Cheng, Hao-Yu Lai, Wei-Chiao Sankar, Raman Chang, Chia-Seng Lin, Kung-Hsuan Department of Physics National Taiwan University Taipei106319 Taiwan Institute of Physics Academia Sinica Taipei115201 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei115201 Taiwan

InSe layered semiconductors with high mobility have advantages over transition-metal dichalcogenides in certain device applications. Understanding the dynamics of carriers, especially around the major bandgaps, is not only of fundamental interest but also important for improving the performance of devices. We investigated ultrafast carrier dynamics in exfoliated InSe near the bandgap and found that the presence of photocarriers led to shrinkage in the optical bandgap. In addition, we observed that the carrier recombination rate increased when the thickness of the InSe nanoflakes was reduced and the process was dominated by surface recombination. For the same flakes, the recombination rate became lower after the freshly exfoliated InSe was exposed to air and oxidized. Using a free carrier diffusion model, layer-dependent surface recombination velocities were obtained. Our investigation reveals that the surface condition and the thickness of few-layer InSe play important roles in carrier lifetimes. © 2023 The Royal Society of Chemistry.

关键词： Energy gap

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Coprecipitation Strategy for Halide-Based Solid-State Electrolytes and Atmospheric-Dependent In Situ Analysis

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ACS Applied Materials and Interfaces 2024年第21期16卷 27394-27399页

作者： Bilo, Josanelle Angela V. Chang, Chung-Kai Chuang, Yu-Chun Fang, Mu-Huai Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsinghua University Hsinchu30013 Taiwan Department of Science and Technology Philippine Textile Research Institute Taguig City1631 Philippines National Synchrotron Radiation Research Center Hsinchu300 Taiwan

In the continuous pursuit of an energy-efficient alternative to the energy-intensive mechanochemical process, we developed a coprecipitation strategy for synthesizing halide-based solid-state electrolytes that warrant both structural control and commercial scalability. In this study, we propose a new coprecipitation approach to synthesized Li3InCl6, exhibiting both structural and electrochemical performance stability, with a high ionic conductivity of 1.42 × 10-3 S cm-1, comparable to that of traditionally prepared counterparts. Through the in situ synchrotron X-ray diffraction technique, we unveil the stability mechanisms and rapid chemical reactions of Li3InCl6 under dry Ar, dry O2, and high-humidity atmosphere, which were not previously reported. Furthermore, the fast reversibility capability of moisture-exposed Li3InCl6 was tracked under vacuum, revealing the optimal recovery conditions at low temperatures (150-200 °C). This work addresses the critical challenges in structural engineering and sustainable mass production and provides insights into chemical reactions under real-world conditions. © 2024 The Authors. Published by American Chemical Society.

关键词： Coprecipitation

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Multiplexed nanoscopy via Buffer Exchange

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ACS nano 2024年第34期18卷 23445-23456页

作者： Chang, Ting-Jui Ben Yang, T. Tony Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei10617 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei10617 Taiwan

Understanding cellular functions, particularly in their intricate complexity, can greatly benefit from the spatial mapping of diverse molecules through multitarget single-molecule localization microscopy (SMLM). Existing methodologies, primarily restricting the encoding dimensions to color and lifetime or requiring cyclic staining, often involve broad chromatic detection, specialized optical configurations, or sophisticated labeling techniques. Here, we propose a simple approach called buffer-exchange stochastic optical reconstruction microscopy (beSTORM), which introduces an additional dimension to differentiate between single molecules irrespective of their spectral properties. This method leverages the distinguishable photoblinking responses to distinct buffer conditions, offering a straightforward yet effective means of fluorophore discrimination. Through buffer exchanges, beSTORM achieves multitarget SMLM imaging with minimal crosstalk. Direct integration with expansion microscopy (ExM) demonstrates its capability to resolve up to six proteins at the molecular level within a single emission color without chromatic aberration. Overall, beSTORM presents a highly compatible imaging platform, promising significant advancements in highly multiplexed nanoscopy for exploring multiple targets in biological systems with nanoscale precision. © 2024 The Authors. Published by American Chemical Society.

关键词： Stochastic systems

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Confined VLS Growth of Single-Layer 2D Tungsten Nitrides

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ACS Applied Materials and Interfaces 2024年第1期16卷 1705-1711页

作者： Chin, Hao-Ting Wang, Deng-Chi Wang, Hao Muthu, Jeyavelan Khurshid, Farheen Chen, Ding-Rui Hofmann, Mario Chuang, Feng-Chuan Hsieh, Ya-Ping Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 106 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei 10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 106 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung 80424 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 106 Taiwan Center for Theoretical and Computational Physics National Sun Yat-sen University Kaohsiung 80424 Taiwan Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan

Two-dimensional (2D) metal nitrides have garnered significant interest due to their potential applications in future electronics and quantum systems. However, the synthesis of such materials with sufficient uniformity and at relevant scales remains an unaddressed challenge. This study demonstrates the potential of confined growth to control and enhance the morphology of 2D metal nitrides. By restricting the reaction volume of vapor-liquid-solid reactions, an enhanced precursor concentration was achieved that reduces the nucleation density, resulting in larger grain sizes and suppression of multilayer growth. Detailed characterization reveals the importance of balancing the energetic and kinetic aspects of tungsten nitride formation toward this ability. The introduction of a promoter enabled the realization of large-scale, single-layer tungsten nitride with a uniform and high interfacial quality. Finally, our advance in morphology control was applied to the production of edge-enriched 2D tungsten nitrides with significantly enhanced hydrogen evolution ability, as indicated by an unprecedented Tafel slope of 55 mV/dec. © 2023 American Chemical Society.

关键词： 2D diode confinement growth HER promoter-assisted growth tungsten nitride VLS

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Recent advances in electronic devices for monitoring and modulation of brain

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nano Research 2021年第9期14卷 3070-3095页

作者： Yong Won Kwon Yoon Sun Jun Young-Geun Park Jiuk Jang Jang-Ung Park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoul 03722Republic of Korea

The brain is actuated by billions of neurons with trillions of interconnections that regulate human *** the mechanisms of these systems that induce sensory reactions and respond to disease remains one of the greatest challenges in science,engineering,and *** advances in nanomaterials and nanotechnologies have led to the extensive research of electronic devices for brain interfaces to better understand the neural activities of the brains complex nervous *** development of sensor devices for monitoring the physiological signals of the brain related to traumatic injury status has accompanied by the progress of electronic neural probes in *** addition,these neurological and stereotactic surgical revolutions hold immense potential for clinical analysis of pharmacological systems within cerebral ***,we review the progress of electronic devices interfacing with brain in terms of the materials,fabrication technologies,and device *** activity can be measured and modulated by brain probes based on newly developed nanofabrication ***,in vivo pathological monitoring of the brain and pharmacological assessment has been developed in miniaturized and wireless *** also consider the key challenges and prospects for further development,and explore the future directions emerging in the latest research.

关键词： neural interfaces neural recording neuromodulation intracranial pressure monitoring microfluidic drug delivery

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Active loading of cyanine 5.5 derivatives into liposomes for deep self-quenching and their applications in deep tissue imaging

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Sensors and Diagnostics 2024年第6期3卷 1028-1038页

作者： Chen, Chong-Yan Jian, Cheng-Bang Gao, Hua-De Yu, Xu-En Chang, Yuan-Chih Leong, Shwee Khuan Shie, Jiun-Jie Lee, Hsien-Ming Institute of Chemistry Academia Sinica Taipei 11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei 11529 Taiwan Department of Chemistry National Taiwan University Taipei 10617 Taiwan Institute of Biological Chemistry Academia Sinica Taipei 11529 Taiwan Academia Sinica Cryo-EM Center Academia Sinica Taipei 11529 Taiwan Sustainable Chemical Science & Technology Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University (NYCU) Hsinchu 30050 Taiwan

Visualizing liposome release profiles in small animals is important for evaluating the pharmacokinetic influence of vesicles. Encapsulating near-infrared (NIR) fluorescent dyes to visualize and report liposomal cargo release in vivo, which necessitates high encapsulation with deep self-quenching, is highly desirable in advanced (such as targeting or trigger-release) liposome development. However, passive loading of NIR dyes usually yields low encapsulation efficiencies (1-5%), causing significant wastage and cost-ineffectiveness while using expensive NIR fluorescent dyes. It would be highly beneficial if an active loading method, which typically has an encapsulation efficiency of nearly 100%, is developed. This research describes an active loading approach for two cyanine 5.5 (Cy5.5) derivatives. We discovered that using ammonium sucrose octasulfate (ASO) as a trapping agent allows for nearly 100% encapsulation for both Cy5.5 dyes, accompanied by the formation of nanoprecipitates inside the liposome, as evidenced by cryogenic electron microscopy. Fluorescence spectroscopy confirmed deep fluorescence self-quenching after active loading and a 60-100-fold fluorescence enhancement upon full content release via liposome rupture. Cellular uptake experiments showed that the fluorescence of Cy5.5-loaded liposomes recovered and plateaued after 9 hours of incubation with cells. In vivo fluorescence imaging (IVIS) demonstrated the same fluorescence activation in tumor-bearing mice intratumorally injected with the liposome. We believe that the developed active loading method will enable Cy5.5-loaded liposomes to be a deep tissue-compatible and cost-effective NIR fluorescence release-reporting platform. © 2024 RSC.

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Self-Expansion Based Multi-Patterning for 2D Materials Fabrication beyond the Lithographical Limit

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Small 2024年第22期20卷 2311209-2311209页

作者： Borhade, Poonam Subhash Chen, Tawat Chen, Ding-Rui Chen, Yu-Xiang Yao, Yu-Chi Yen, Zhi-Long Tsai, Chun Hsiung Hsieh, Ya-Ping Hofmann, Mario Department of Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Hsinchu30092 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan

Two-dimensional (2D) materials are promising successors for silicon transistor channels in ultimately scaled devices, necessitating significant research efforts to study their behavior at nanoscopic length scales. Unfortunately, current research has limited itself to direct patterning approaches, which limit the achievable resolution to the diffraction limit and introduce unwanted defects into the 2D material. The potential of multi-patterning to fabricate 2D materials features with unprecedented precision and low complexity at large scale is demonstrated here. By combining lithographic patterning of a mandrel and bottom-up self-expansion, this approach enables pattern resolution one order of magnitude below the lithographical resolution. In-depth characterization of the self-expansion double patterning (SEDP) process reveals the ability to manipulate the critical dimension with nanometer precision through a self-limiting and temperature-controlled oxidation process. These results indicate that the SEDP process can regain the quality and morphology of the 2D material, as shown by high-resolution microscopy and optical spectroscopy. This approach is shown to open up new avenues for research into high-performance, ultra-scaled 2D materials devices for future electronics. © 2023 Wiley-VCH GmbH.

关键词： Expansion

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Tungsten Nitride (W5N6): An Ultraresilient 2D Semimetal

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nano Letters 2024年第1期24卷 67-73页

作者： Chin, Hao-Ting Wang, Deng-Chi Gulo, Desman Perdamaian Yao, Yu-Chi Yeh, Hao-Chen Muthu, Jeyavelan Chen, Ding-Rui Kao, Tzu-Chun Kalbáč, Martin Lin, Ping-Hui Cheng, Cheng-Maw Hofmann, Mario Liang, Chi-Te Liu, Hsiang-Lin Chuang, Feng-Chuan Hsieh, Ya-Ping Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Physics National Taiwan Normal University Taipei11677 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Institute of Physics Academia Sinica Taipei115201 Taiwan International Graduate Program of Nano Science and Technology National Taiwan University Taipei10617 Taiwan Graduate Institute of Applied Physics National Taiwan University Taipei10617 Taiwan J. Heyrovský Institute of Physical Chemistry Czech Academy of Sciences Dolejškova 2155/3 Prague182 23 Czech Republic Hsinchu300092 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Center for Theoretical and Computational Physics National Sun Yat-sen University Kaohsiung80424 Taiwan

Two-dimensional transition metal nitrides offer intriguing possibilities for achieving novel electronic and mechanical functionality owing to their distinctive and tunable bonding characteristics compared to other 2D materials. We demonstrate here the enabling effects of strong bonding on the morphology and functionality of 2D tungsten nitrides. The employed bottom-up synthesis experienced a unique substrate stabilization effect beyond van-der-Waals epitaxy that favored W5N6 over lower metal nitrides. Comprehensive structural and electronic characterization reveals that monolayer W5N6 can be synthesized at large scale and shows semimetallic behavior with an intriguing indirect band structure. Moreover, the material exhibits exceptional resilience against mechanical damage and chemical reactions. Leveraging these electronic properties and robustness, we demonstrate the application of W5N6 as atomic-scale dry etch stops that allow the integration of high-performance 2D materials contacts. These findings highlight the potential of 2D transition metal nitrides for realizing advanced electronic devices and functional interfaces. © 2023 American Chemical Society

关键词： Tungsten compounds

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Advanced TiO2/Al2O3 Bilayer ALD Coatings for Improved Lithium-Rich Layered Oxide Electrodes

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ACS Applied Materials and Interfaces 2024年第10期16卷 13029-13040页

作者： Chen, Wei-Ming Hsieh, Hsin-Yu Wu, Dong-Ze Tang, Horng-Yi Chang-Liao, Kuei-Shu Chi, Po-Wei Wu, Phillip M. Wu, Maw-Kuen Institute of Physics Academia Sinica 128 Section 2 Academia Road Taipei11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsing Hua University 128 Section 2 Academia Road Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu300044 Taiwan Graduate Institute of Energy and Sustainability Technology National Taiwan University of Science and Technology 43 Keelung Road Sec 4 Taipei10607 Taiwan Department of Applied Chemistry National Chi Nan University 1 University Road Puli Nantou545301 Taiwan College of Science National Chung Hsing University 145 Xingda Rd. South Dist. Taichung City402 Taiwan

Surface modification is a highly effective strategy for addressing issues in lithium-rich layered oxide (LLO) cathodes, including phase transformation, particle cracking, oxygen gas release, and transition-metal ion dissolution. Existing single-/double-layer coating strategies face drawbacks such as poor component contact and complexity. Herein, we present the results of a low-temperature atomic layer deposition (ALD) process for creating a TiO2/Al2O3 bilayer on composite cathodes made of AS200 (Li1.08Ni0.34Co0.08Mn0.5O2). Electrochemical analysis demonstrates that TiO2/Al2O3-coated LLO electrodes exhibit improved discharge capacities and enhanced capacity retention compared with uncoated samples. The TAA-5/AS200 bilayer-coated electrode, in particular, demonstrates exceptional capacity retention (∼90.4%) and a specific discharge capacity of 146 mAh g-1 after 100 cycles at 1C within the voltage range of 2.2 to 4.6 V. The coated electrodes also show reduced voltage decay, lower surface film resistance, and improved interfacial charge transfer resistances, contributing to enhanced stability. The ALD-deposited TiO2/Al2O3 bilayer coatings exhibit promising potential for advancing the electrochemical performance of lithium-rich layered oxide cathodes in lithium-ion batteries. © 2024 The Authors. Published by American Chemical Society.

关键词： Cathodes

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Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

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Energy & Environmental Materials 2024年第6期7卷 230-237页

作者： Jong-Woon Ha Seung Hun Eom Bo Kyung Cha Seyeong Song Hyeong Ju Eun Jong H.Kim Jong Mok Park BongSoo Kim Byoungwook Park Seo-Jin Ko Sung Cheol Yoon Changjin Lee In Hwan Jung Do-Hoon Hwang Department of Chemistry Chemistry Institute for Functional MaterialsPusan National UniversityBusan 46241Korea Division of Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Electro-Medical Device Research Center Korea Electrotechnology Research Institute(KERI)Ansan 15588Korea Graduate School of Carbon Neutrality School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Molecular Science and Technology Ajou UniversitySuwon 16449Korea Research Center for Advanced Specialty Chemicals Korea Research Institute of Chemical TechnologyUlsan 44412Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Organic and Nano Engineering Human-Tech Convergence ProgramHanyang University222 Wangsimni-roSeongdong-guSeoul 04763Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency ***,this is quite challenging because of the heavy weight of the scintillator and silicon *** weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic *** study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer(~700 nm),owing to the symmetric backbone and highly soluble molecular structure of *** ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density(Jd~10−10 A cm^(−2))at a negative bias(−2.0 V)while maintaining high responsivity(R=0.29 A W−1)even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_(sh)^(*)=2.18×10^(13)Jones in the organic *** organic photodetectors are developed by slot-die coating for use in X-ray detectors,which exhibit D_(sh)^(*)=2.73×10^(12)Jones with clear rising(0.26 s)and falling(0.29 s)response times upon X-ray *** reliability is also proven by linear response of the X-ray detector,and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray

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