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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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Saturable intercalation doping enables scalable and selective graphene gas sensors on plastic

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Chemical Engineering Journal 2025年 515卷

作者： Kwon, Bitnuri Lee, Jung Hun Jo, Sae Byeok Hwang, Jinhyun Lee, Donggeun Cha, Jonghyun Lim, Soomook Suk, Ji Won Lee, Wi Hyoung Department of Organic and Nano System Engineering Konkuk University Seoul05029 Cuba Department of Materials Science and Engineering and the Materials Research Center Northwestern University 2220 Campus Drive EvanstonIL60208-3108 United States School of Chemical Engineering Sungkyunkwan University Suwon16419 Cuba Sungkyunkwan University Suwon16419 Cuba Advanced Materials Program Department of Materials Science and Engineering Konkuk University Seoul05029 Cuba School of Mechanical Engineering Sungkyunkwan University Suwon16419 Cuba Department of Smart-Fab. Technology Sungkyunkwan University Suwon16419 Cuba Department of Materials Science and Engineering Konkuk University Seoul05029 Cuba

Developing highly sensitive and selective gas sensors for nitrogen dioxide (NO2) detection remains crucial for environmental monitoring and public health protection. Graphene-based chemiresistive sensors show promise due to their exceptional electronic properties and high surface area, which enhance gas adsorption. However, they face persistent challenges in selectivity, stability, and sensitivity characteristics. This study presents a facile one-step molecular intercalation doping approach that can effectively overcome these limitations. By intercalating carefully selected dopant molecules between graphene and flexible substrates during the wet-transfer process, we achieve uniform doping distribution while maintaining intrinsic carrier mobility. The resulting sensors demonstrate remarkable NO2 detection capabilities with a limit of detection of 1 ppb at room temperature. Importantly, the intercalated devices exhibit exceptional stability over extended periods of time and show minimal cross-sensitivity to common interfering gases. Moreover, the sensors retain their sensing characteristics under mechanical deformation, including fully transparent gas sensors with a dogbone structure, thereby enabling seamless integration into wearable monitoring systems. Our scalable fabrication process and comprehensive understanding of the intercalation doping mechanism provide a practical pathway for the development of reliable, flexible gas sensors capable of addressing real-world environmental and healthcare challenges. © 2025 Elsevier B.V.

关键词： pH sensors

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Electrically tunable helicity of cholesteric heliconical superstructure [Invited]

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Chinese Optics Letters 2020年第8期18卷 22-27页

作者： Conglong Yuan Wenbin Huang Xiaoqian Wang Dong Shen Zhigang Zheng Department of Physics East China University of Science and TechnologyShanghai 200237China School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State UniversityKentOhio 44242USA

The dynamic manipulation of the helicity in a cholesteric helical superstructure could enable precise control over its physical and chemical properties, thus opening numerous possibilities for exploring multifunctional *** cholesteric material satisfies the sufficiently small bending elastic effect, an electrically induced deformation named the cholesteric heliconical superstructure is formed. Through theoretical and numerical analysis, we systematically studied the tunable helicity of the heliconical superstructure, including the evolution of the corresponding oblique angle and pitch length. To further confirm the optical properties, Berreman’s 4 × 4 matrix method was employed to numerically analyze the corresponding structure reflection under the dual stimuli of chirality and electric field.

关键词： cholesteric liquid crystal heliconical superstructure tunable reflection band electro-optical materials

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Hot-carrier phenomenon in perovskite solar cells under white light emitting diode

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Discover Energy 2024年第1期4卷 1-9页

作者： Umar, Akrajas Ali Alias, Nabilah Umar, Marjoni Imamora Ali Fauzia, Vivi Nurdin, Muhammad Maulidiyah, Maulidiyah Noviyanti, Atiek Rostika Zhan, Yiqiang Institute of Microengineering and Nanoelectronics Universiti Kebangsaan Malaysia UKM Bangi Malaysia Nickel Research Institute Universitas Muhammadiyah Kendari Kendari Indonesia Physics Education Program Faculty of Tarbiyah Institut Agama Islam Negeri Mahmud Yunus Batusangkar Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Jakarta Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Halu Oleo Kendari Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Bandung Indonesia Center for Micro Nano System School of Information Science and Technology Fudan University Shanghai China

Hot-carrier solar cells offer the potential for enhanced power conversion efficiency by tapping into the kinetic energy of hot carriers generated upon sunlight absorption. This involves using specially designed materials capable of efficiently extracting and utilizing the energy of these hot carriers to produce electrical power. Here, we observed such a hot carrier effect in hexamine doped methylammonium lead triiodide perovskite solar cells when exposed to 100 mW/cm2 of 5000 K white LED light. We discovered that these perovskite solar cells exhibited remarkable power conversion efficiency, reaching up to 54.22% with the Voc (open-circuit voltage) and Jsc (short-circuit current density) values were measured at 1.10 V and 54 mA/cm2, respectively. In comparison, under similar conditions but using a solar simulator, the power conversion efficiency remained below 20%. Our results suggest that the high PCE under white LED irradiation is due to the fine resonance between the light energy and perovskite band gap energy, enabling long carrier lifetime and then allowing massive photovoltaics process. These findings highlight the alternative to achieve hot carrier’s perovskite solar cells and efficient energy generation by converting light energy into the wavelength match with the perovskite materials absorber energy band gap.

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Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO3

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Physical Review X 2024年第1期14卷 011022-011022页

作者： Uddipta Kar Elisha Cho-Hao Lu Akhilesh Kr. Singh P. V. Sreenivasa Reddy Youngjoon Han Xinwei Li Cheng-Tung Cheng Song Yang Chun-Yen Lin I-Chun Cheng Chia-Hung Hsu David Hsieh Wei-Cheng Lee Guang-Yu Guo Wei-Li Lee Institute of Physics Academia Sinica Nankang Taipei 11529 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan Department of Physics California Institute of Technology Pasadena California 91125 USA Scientific Research Division National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei Taiwan Department of Physics Applied Physics and Astronomy Binghamton University Binghamton New York 13902 USA Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan

The identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems. In topological Dirac and Weyl semimetals, nontrivial conical bands with Fermi-arc surface states give rise to negative longitudinal magnetoresistance due to chiral anomaly effect and unusual thickness dependent quantum oscillation from Weyl-orbit effect, which were demonstrated recently in experiments. In this work, we report the experimental observations of large nonlinear and nonreciprocal transport effects for both longitudinal and transverse channels in an untwinned Weyl metal of SrRuO3 thin film grown on a SrTiO3 substrate. From rigorous measurements with bias current applied along various directions with respect to the crystalline principal axes, the magnitude of nonlinear Hall signals from the transverse channel exhibits a simple sinα dependence at low temperatures, where α is the angle between bias current direction and orthorhombic [001]o, reaching a maximum when current is along orthorhombic [11¯0]o. On the contrary, the magnitude of nonlinear and nonreciprocal signals in the longitudinal channel attains a maximum for bias current along [001]o, and it vanishes for bias current along [11¯0]o. The observed α-dependent nonlinear and nonreciprocal signals in longitudinal and transverse channels reveal a magnetic Weyl phase with an effective Berry curvature dipole along [11¯0]o from surface states, accompanied by 1D chiral edge modes along [001]o.

关键词： Electrical conductivity Hall effect Quantum transport Topological materials Topological phases of matter Transport phenomena Magnetic thin films Thin films Weyl semimetal Boltzmann theory Continuous symmetries in condensed matter Epitaxy Film deposition Hall bar Methods in transport Resistivity measurements Symmetries in condensed matter Transport techniques

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Multi-Functional Locomotion of Collectively Assembled Shape-Reconfigurable Electronics

SSRN

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SSRN 2023年

作者： Cho, Woongbi Kang, Dong Jun Hahm, Min Jeong Jeon, Jisoo Kim, Dong-Gyun Kim, Yong Seok Han, Tae Hee Wie, Jeong Jae Department of Organic and Nano Engineering Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul04763 Korea Republic of Human-Tech Convergence Program Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul04763 Korea Republic of Program in Environmental and Polymer Engineering Inha University 100 Inha-ro Michuhol-gu Incheon22212 Korea Republic of Advanced Materials Division Korea Research Institute of Chemical Technology 141 Gajeong-ro Yuseong-gu Daejeon34114 Korea Republic of Department of Chemical Engineering Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul04763 Korea Republic of Institute of Nano Science and Technology Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul04763 Korea Republic of Department of Chemical Engineering State University of New York College of Environmental Science and Forestry SyracuseNY13210 United States The Michael M. Szwarc Polymer Research Institute State University of New York College of Environmental Science and Forestry SyracuseNY13210 United States

Beyond typical flexible electronics, stimuli-responsive shape-reconfigurable electronics are great candidates for the next-generation miniaturized electronics, carrying out complex missions by morphing their geometry and transferring their bodies to the desired positions. To achieve shape-reconfigurable electronics, it is essential to give shape-programmability as well as high electrical conductivity for polymeric materials. However, this is difficult to achieve due to a trade-off relationship between the shape-reconfigurability and the electrical conductivity of polymer composites that embed conductive fillers. Herein, we introduced highly conductive and physical intelligence-encoded polymeric composites based on MXene/liquid crystal elastomer (LCE) bilayer (MLB), for shape-reconfigurable electronics performing on-demand and reversible 3D morphing and locomotion. The MLB demonstrated remarkable photo-/electro-thermally driven bending and twisting performance under near-infrared (NIR) light with 0.4 W cm-2 and voltage application of 3.5 V without delamination, originating from both high photothermal conversion efficiency and electrical conductivity of ~5,300 S cm-1. The MLB also proved structural durability after 1000 cycles of bending originating from the stable interface induced by hydrogen bonding between MXene and LCE. Macroscopic collective assembly of the MLBs enabled dynamic locomotion inspired by nature. Collectively assembled MLBs demonstrated crawling, rotating, jumping, and sling-shooting by engineering the symmetricity of assembled structure and introducing snap-through instability. © 2023, The Authors. All rights reserved.

关键词： Flexible electronics

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Design of experiments as a strategy for modulating the colloidal stability, physico-chemical properties and drug-delivery potential of small mesoporous silica nanoparticles

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Advanced Powder technology 2023年第10期34卷

作者： Lestari, Windy Ayu Saputra, Ozi Adi Díaz-García, Diana Wahyuningsih, Sayekti Gómez-Ruiz, Santiago Wibowo, Fajar Rakhman Magister Program in Chemistry Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta57126 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta57126 Indonesia COMET-NANO Group Departamento de Biología y Geología Física y Química Inorgánica Universidad Rey Juan Carlos Calle Tulipán s/n Madrid MóstolesE-28933 Spain Institute of Chemistry Taiwan International Graduate Program Sustainable Chemical Science and Technology Academia Sinica Taipei115 China Department of Chemical Engineering National Taiwan University Taipei10617 China

The synthesis of highly stable small mesoporous silica nanoparticles (SMSN) in colloid dispersions is still challenging for biomedical applications. This study is focus on the successfully synthesis and formulation of porous, highly dispersed and colloidal stable SMSN via the soft–templating method. This study reports how the differences in synthesis variables, namely, temperature, amount of triethylamine (TEA) and/or cetyltrimethylammonium bromide (CTAB) influence the morphology and textural properties of SMSN. The analysis of the particle size, surface area, pore size, pore volume, zeta potential, and colloidal stability (represent by absorbance decreasing rate) show that temperature is the most influential factor governing the preparation of SMSN. The optimal conditions found for the synthesis of these nanoparticles were 50 °C, using a molar ratio between TEA and CTAB (3.5971: 1). Therefore, our study shows interesting insights on the effect of each variable to control the morphology and properties of small MSN for the design of this kind of nanoparticulated systems, therefore, giving valuable data to be considered for the future construction of tailor-made effective drug carrier materials. © 2023 The Society of Powder technology Japan

关键词： Synthesis (chemical)

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Shin et al. Reply:

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Physical Review Letters 2023年第5期131卷 059602-059602页

作者： Dongbin Shin Nicolas Tancogne-Dejean Jin Zhang Mahmut Sait Okyay Angel Rubio Noejung Park Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science Luruper Chaussee 149 22761 Hamburg Germany Department of Physics and Photon Science Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea Materials Science & Engineering Program Department of Chemical & Environmental Engineering Department of Physics & Astronomy and Department of Chemistry University of California-Riverside Riverside 92521 California USA Nano-Bio Spectroscopy Group Departamento de Fsica de Materiales Universidad del Pas Vasco 20018 San Sebastian Spain Center for Computational Quantum Physics (CCQ) The Flatiron Institute 162 Fifth avenue New York New York 10010 USA Department of Physics Ulsan National Institute of Science and Technology (UNIST) UNIST-gil 50 Ulsan 44919 Korea

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High-sensitivity of initial SrO growth on the residual resistivity in epitaxial thin films of SrRuO3 on SrTiO3(001)

arXiv

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arXiv 2021年

作者： Kar, Uddipta Singh, Akhilesh Kr. Yang, Song Lin, Chun-Yen Das, Bipul Hsu, Chia-Hung Lee, Wei-Li Institute of Physics Academia Sinica Nankang Taipei11529 Taiwan National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica National Taiwan University Taiwan

The growth of SrRuO3 (SRO) thin film with high-crystallinity and low residual resistivity (RR) is essential to explore its intrinsic properties. Here, utilizing the adsorption-controlled growth technique, the growth condition of initial SrO layer on TiO2-terminated SrTiO3 (STO) (001) substrate was found to be crucial for achieving a low RR in the resulting SRO film grown afterward. The optimized initial SrO layer shows a c(2 × 2) superstructure that was characterized by electron diffraction, and a series of SRO films with different thicknesses (ts) were then grown. The resulting SRO films exhibit excellent crystallinity with orthorhombic-phase down to t ≈ 4.3 nm, which was confirmed by high resolution X-ray measurements. From X-ray azimuthal scan across SRO orthorhombic (02±1) reflection, we uncover four structural domains with a dominant domain of orthorhombic SRO [001] along cubic STO [010] direction. The dominant domain population depends on t, STO miscut angle (α), and miscut direction (β), giving a volume fraction of about 92 % for t ≈ 26.6 nm and (α,β) ≈ (0.14o, 5o). On the other hand, metallic and ferromagnetic properties were well preserved down to t ≈ 1.2 nm. Residual resistivity ratio (RRR = ρ(300K)/ρ(5K)) reduces from 77.1 for t ≈ 28.5 nm to 2.5 for t ≈ 1.2 nm, while ρ(5K) increases from 2.5 µΩcm for t ≈ 28.5 nm to 131.0 µΩcm for t ≈ 1.2 nm. The ferromagnetic onset temperature (Tc′) of around 151 K remains nearly unchanged down to t ≈ 9.0 nm and decreases to 90 K for t ≈ 1.2 nm. Our finding thus provides a practical guideline to achieve high crystallinity and low RR in ultra-thin SRO films by simply adjusting the growth of initial SrO layer. Copyright © 2021, The Authors. All rights reserved.

关键词： Ferromagnetism

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Structural, magnetic, and electronic properties of a GdAsSe single crystal: Experimental and theoretical studies

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Physical Review B 2024年第18期109卷 184420-184420页

作者： R. Kalaivanan Balaji Venkatesan B. Dundi Sri Chandana Rajesh Kumar Ulaganathan G. Senthil Murugan K. Moovendaran Joydev Khatua Li-Hsin Su W. Zhou Xiaofeng Xu Chia-Seng Chang Tien-Ming Chuang Yoshiyuki Iizuka I. Panneer Muthuselvam Horng-Tay Jeng Kwang-Yong Choi Raman Sankar Institute of Physics Academia Sinica Taipei 10617 Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei 11529 Taiwan Department of Physics School of Basic and Applied Sciences Central University of Tamil Nadu Neelakudi Thiruvarur 610005 Tamil Nadu India Department of Physics Sungkyunkwan University Suwon 16419 Republic of Korea Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan Department of Electro Physics National Yang Ming Chiao Tung University Hsinchu 300093 Taiwan School of Electronic and Information Engineering Changshu Institute of Technology Changshu 215500 China Department of Applied Physics Zhejiang University of Technology Hangzhou 310023 China Institute of Earth Sciences Academia Sinica Taipei 10617 Taiwan Department of Physics (MMV) Banaras Hindu University Varanasi 221005 Uttar Pradesh India Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan

We report high-quality single-crystal growth, x-ray diffraction, magnetic susceptibility [χ(T,H)], magnetization [M(H)], heat capacity [CP(T,H)], electrical resistivity [ρ(T,H)], and electron spin resonance (ESR) measurements of GdAsSe as functions of temperature and magnetic field. We identify an antiferromagnetic phase transition at TN∼11.9±0.2 K and construct magnetic phase diagrams for H||ab and H||c axes based on the χ(T,H) and CP(T,H) data. Isothermal M(H) curves along the H||ab direction at 3 K exhibit a field-induced spin orientation at HC∼3.78T. Both M(H) and χ(T,H) indicate an easy-plane-type anisotropy. The Curie-Weiss analysis of the high-temperature paramagnetic χ(T) yields a negative Weiss temperature, suggesting dominant antiferromagnetic interactions between the Gd ions. Magnetic entropy reaches 83% of R ln8 at TN. The presence of residual entropy above TN and the persistence of ESR critical broadening up to ∼3TN alludes to a degree of magnetic frustration in the studied material. The ρ(T) data above TN is well fitted to the Bloch-Grüneisen theory for metals. Further, density functional theory calculations reveal an antiferromagnetic ground state where the Gd atoms are coupled ferromagnetically in the ab plane and antiferromagnetically along the c axis.

关键词： Magnetic anisotropy Magnetic coupling Magnetic interactions Magnetic order Magnetism

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