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Effects of nanopores and sulfur doping on hierarchically bunched carbon fibers to protect lithium metal anode

Carbon Energy 2021年第5期3卷 784-794页

作者： Ji In Jung Sunwoo Park Son Ha Se Youn Cho Hyoung-Joon Jin Young Soo Yun Program in Environmental and Polymer Engineering Inha UniversityIncheonSouth Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulSouth Korea Carbon Composite Materials Research Center Korea Institute of Science and TechnologyWanju-gunJeollabuk-doSouth Korea Department of Polymer Science and Engineering Inha UniversityIncheonSouth Korea Department of Integrative Energy Engineering Korea UniversitySeoulSouth Korea

Studies on three-dimensional structured carbon templates have focused on how to guide homogeneous lithium metal nucleation and growth for lithium metal anodes(LMAs).However,there is still insufficient evidence for a key factor to achieve their high electrochemical ***,the effects of nanopores and sulfur doping on carbon-based nanoporous host(CNH)electrode materials for LMAs were investigated using natural polymer-derived *** pore-filling behaviors of lithium metal in the nanopores of the CNH electrode materials were first observed by ex situ scanning electron microscopy analysis,where the protective lithium metal nucleation and growth process led to significantly high Coulombic efficiency(CE)of~99.4%and stable 600 *** addition,a comparison study of CNH and sulfurdoped CNH(S-CNH)electrodes,which differ only in the presence or absence of sulfur,revealed that sulfur doping can cause lower electrochemical series resistance,higher CE value,and better cycling stability in a wide range of current densities and number of ***,S-CNH-based LMAs showed high electrochemical performance in full-cell Li-S battery tests using a sulfur copolymer cathode,where a high energy density of 1370Wh kgelectrode−1 and an excellent power density of 4120Wkgelectrode−1 were obtained.

关键词： carbon template Li-S batteries lithium metal anode lithium metal batteries nanoporous carbon sulfur doping

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Fabric-substrated capacitive biopotential sensors enhanced by dielectric nanoparticles

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Nano Research 2021年第9期14卷 3248-3252页

作者： Xiangjun Chen Xiaoxiang Gao Akihiro Nomoto Keren Shi Muyang Lin Hongjie Hu Yue Gu Yangzhi Zhu Zhuohong Wu Xue Chen Xinyu Wang Baiyan Qi Sai Zhou Hong Ding Sheng Xu Materials Science and Engineering Program University of California San DiegoLa JollaCA 92093USA Department of NanoEngineering University of California San DiegoLa JollaCA 92093USA Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92093USA Department of Bioengineering University of California San DiegoLa JollaCA 92093USA

Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human ***-contact,capacitive sensing electrodes prevent potential skin iritations,and are thus beneficial for long-term *** capacitive electrodes are either connected to a separate control circuit via external wires or have limited sensing capacitances,which leads to low signal *** study demonstrates a stretchable capacitive sensing device with integrated electrodes and control electronics,with enhanced signal *** electrodes and the control electronics are fabricated on a common fabric substrate for breathability and strain-limiting *** stretchable electrodes are based on an island-bridge design with a stretchability as high as-100%,and an area ratio as high as-80%.By using a dielectric calcium copper titanate(CCTO)composite as the adhesive layer,the electrode capacitance can be increased,yielding an enhanced signal-to-noise ratio(SNR)in the acquired *** device offers a convenient and comfortable approach for long-term non-contact monitoring of biopotential signals.

关键词： capacitive sensing biopotential stretchable calcium copper titanate(CCTO) signal-to-noise ratio(SNR)

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Recent Advancements in Nanophotonics for Optofluidics

arXiv

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arXiv 2024年

作者： Yang, Sen Hong, Chuchuan Zhu, Guodong Anyika, Theodore Hong, Ikjun Ndukaife, Justus C. Institute of Physics Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Beijing100190 China Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Electrical and Computer Engineering Vanderbilt University NashvilleTN37235 United States Department of Mechanical Engineering Vanderbilt University NashvilleTN37235 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37240 United States

Optofluidics is dedicated to achieving integrated control of particle and fluid motion, particularly on the micrometer scale, by utilizing light to direct fluid flow and particle motion. The field has seen significant growth recently, driven by the concerted efforts of researchers across various scientific disciplines, notably for its successful applications in biomedical science. In this review, we explore a range of optofluidic architectures developed over the past decade, with a primary focus on mechanisms for precise control of micro and nanoscale biological objects and their applications in sensing. Regarding nanoparticle manipulation, we delve into mechanisms based on optical nanotweezers using nanolocalized light fields and light-based hybrid effects with dramatically improved performance and capabilities. In the context of sensing, we emphasize those works that used optofluidics to aggregate molecules or particles to promote sensing and detection. Additionally, we highlight emerging research directions, encompassing both fundamental principles and practical applications in the field. Copyright © 2024, The Authors. All rights reserved.

关键词： Flow of fluids

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Enhancement of superconducting transition temperature in Nb/Pd bilayers upon rapid thermal hydrogenation

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Physical Review B 2023年第10期108卷 104502-104502页

作者： Junjie Li Ali C. Basaran Ralph El Hage Ivan K. Schuller Department of Physics and Center for Advanced Nanoscience University of California–San Diego La Jolla California 92093 USA Materials Science and Engineering Program University of California–San Diego La Jolla California 92093 USA

Recent discoveries of high-Tc superconducting hydrides at high pressure have opened up new possibilities for improving the superconducting transition temperature (Tc) using hydrogenation. Here, a unique thermodynamic approach is developed based on the concept of rapid thermal annealing and is adopted to study the hydrogenation effect on the superconducting properties of Nb/Pd bilayer films. Below 300∘C annealing temperatures, the Tc is enhanced from 8.77 to 9.06 K and is correlated with the compression of the Nb unit cell. A weak lattice expansion occurs at higher annealing temperatures, and the Tc is gradually suppressed. Furthermore, the rapid thermal hydrogenation affects the Tc differently depending on the substrate on which the Nb/Pd bilayers are grown. For the c-cut Al2O3 substrate, the Tc reduction starts at 250∘C, while for the r-cut Al2O3, this occurs at 350∘C. We associate these features with the elastic behavior of Nb film upon hydrogenation. A proposed model shows that the increase of Tc could be caused by the compressive stress related to the rapid nucleation of hydrides or the removal of impurities. Our discoveries provide insights into how superconductivity can be manipulated by rapid thermal hydrogenation.

关键词： Superconductivity Elemental superconductors Thin films Film deposition Heat treatment X-ray diffraction

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Optical and Mechanical Properties of Rutile TiO2 Subjected to AC Flash Processing

SSRN

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SSRN 2024年

作者： Masuda, Hiroshi Tokunaga, Tomoharu Yamamoto, Takahisa Yoshida, Hidehiro Department of Materials Science and Engineering School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Department of Materials Design Innovation Engineering School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya464-8603 Japan Next Generation Zirconia Social Cooperation Program Institute of Engineering Innovation The University of Tokyo 2-11-16 Yayoi Bunkyo-ku Tokyo113-8656 Japan

Unusual physical properties associated with lattice defects induced by flash sintering and processing of oxide ceramics have attracted attentions. In this study, optical and mechanical properties of undoped and polycrystalline rutile TiO2 subjected to alternating current (AC) flash processing were characterized through diffuse reflectance spectroscopy and nanoindentation experiments at room temperature. The flashed sample exhibited substantial optical blackening and elastic softening but negligible changes in the hardness and crystal structure. The elastic softening demonstrated a significant rate dependence (i.e., elastic moduli decreased with testing rate) indicating anelasticity, which was possibly caused by stress-induced reordering of point defect dipoles induced by AC flash processing. This anelasticity suggests that pronounced ionic mobility is obtained by flash processing even in undoped systems, which can potentially be extended to a general understanding of mass transport phenomena in transient metal oxides in strong electric fields. © 2024, The Authors. All rights reserved.

关键词： Nanoindentation

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Theoretical insights into metal-doped nanostructured hematite catalyst supported by graphene underlayer for photoelectrochemical water splitting applications

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Discover Catalysis 2025年第1期2卷 1-27页

作者： Bhattacharya, Labanya Caspary Toroker, Maytal Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa Israel The Nancy and Stephen Grand Technion Energy Program Technion-Israel Institute of Technology Haifa Israel Resnick Sustainability Center for Catalysis Technion-Israel Institute of Technology Haifa Israel

Catalysis is pivotal in the production of green hydrogen through water splitting to meet the goal of carbon neutrality. Hematite (Fe2O3) is an excellent catalyst and benchmarked photoanode materials in photoelectrochemical water splitting. Among the metal dopants, aluminum (Al) substitution in hematite is found intrinsically. In this study, we investigate Al doped nanostructured hematite as a photoanode material and a catalyst in water oxidation mechanism using density functional theory+ U methodology. We have found that Al doping in hematite monolayer leads to unfavorable increase in theoretical overpotential value by 0.19 V. To improve the efficiency of oxygen evolution reaction, we consider heterostructuring of Al doped nanostructured hematite with pristine graphene and nitrogen (N) doped graphene as an underlayer material. Nitrogen doped graphene underlayer leads to the lowest overpotential value of 0.54 V compared to Al doped hematite catalyst (0.96 V) and graphene-Al doped hematite catalyst (0.63 V). The work function is notably reduced after nitrogen doping by 1.41 eV and 1.12 eV as compared to graphene-Al doped hematite and Al doped hematite, respectively. Charge density difference and Bader charge analysis confirm that nitrogen doped graphene underlayer induces delocalized charge density and lowers the activity of the surface states in the *O intermediate. Nitrogen doped graphene-Al doped hematite heterostructure has nearly zero band gap and has the highest cumulative probability of charge transport at photoanode’s surface. Our theoretical study provides mechanistic insights into improving the catalytic efficiency of Al doped nanostructured hematite by heterostructuring with pristine and N doped graphene.

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P-210: Photolithography Patterning of Organic Light-Emitting Diodes Using Solvent Resistant Electron Transport materials

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SID Symposium Digest of Technical Papers 2024年第1期55卷 2181-2183页

作者： Hyunjin Yu Eun Yeong So Kyunghyun Eun Byung Jun Jung Myungwoong Kim Jin-Kyun Lee Jun Yeob Lee School of Chemical Engineering Sungkyunkwan University 2066 Seobu-ro Jangan-gu Suwon-si Gyeonggi-do Republic of Korea 16419 Department of Materials Science and Engineering University of Seoul Seoul Republic of Korea 02504 Department of Chemistry and Chemical Engineering Inha University Incheon Republic of Korea 22212 Program in Environment and Polymer Engineering Inha University 100 Inha-ro Michuhol-gu Incheon Republic of Korea 22212

In this paper, we develop a novel approach to achieve ultra-high resolution in organic light-emitting diodes (OLEDs) through a photolithography patterning process. It is important to apply a solvent resistant electron transport layer (ETL) in the photolithography pattering of OLED because of solution coating process of photoresist on the ETL. Therefore, a solvent resistant ETL named 2,7-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9 ′ -spirobi[fluorene] (SBF-Trz) was developed and employed as the ETL of OLEDs. The SBF-Trz demonstrated excellent solvent resistance during photolithography process and enabled device performances comparable to those of the conventional OLED without any photolithography process. It was found that the SBF-Trz ETL is appropriate as the ETL of the OLED patterned by photolithography due to good electron transport property, good stability, and good solvent resistance.

关键词： Organic light-emitting diodes (OLED) Electron Transport Layer (ETL) Photolithography Patterning Reactive Ion Etching (RIE) Micro display Ultra High resolution FMM-Free

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Transferable screened range-separated hybrid functionals for electronic and optical properties of van der Waals materials

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Physical Review materials 2023年第10期7卷 104001-104001页

作者： María Camarasa-Gómez Ashwin Ramasubramaniam Jeffrey B. Neaton Leeor Kronik Department of Molecular Chemistry and Materials Science Weizmann Institute of Science Rehovoth 7610001 Israel Department of Mechanical and Industrial Engineering University of Massachusetts Amherst Amherst Massachusetts 01003 USA Materials Science and Engineering Graduate Program University of Massachusetts Amherst Amherst Massachusetts 01003 USA Department of Physics University of California Berkeley California 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Kavli Energy NanoSciences Institute at Berkeley University of California Berkeley California 94720 USA

The accurate description of electronic properties and optical absorption spectra is a long-standing challenge for density functional theory. Recently, the introduction of screened range-separated hybrid (SRSH) functionals for solid-state materials has allowed for the calculation of fundamental band gaps and optical absorption spectra that are in very good agreement with many-body perturbation theory. However, since solid-state SRSH functionals are typically tuned to reproduce the properties of bulk phases, their transferability to low-dimensional structures, which experience substantially different screening than in the bulk, remains an open question. In this work, we explore the transferability of SRSH functionals to several prototypical van der Waals materials, including transition-metal sulfides and selenides, indium selenide, black phosphorus, and hexagonal boron nitride. Considering the bulk and a monolayer of these materials as limiting cases, we show that the parameters of the SRSH functional can be determined systematically, using only the band-edge quasiparticle energies of these extremal structural phases as fitting targets. The resulting SRSH functionals can describe both electronic band structures and optical absorption spectra with accuracy comparable to more demanding ab initio many-body perturbation theory (GW and Bethe-Salpeter equation) approaches. Selected examples also demonstrate that the SRSH parameters, obtained from the bulk and monolayer reference structures, display good accuracy for band structures and optical spectra of bilayers, indicating a degree of transferability that is independent of the fitting procedure.

关键词： 2-dimensional systems Density functional theory First-principles calculations GW method

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Textured BaTiO3 nanorod arrays synthesized via hydrothermal method: Enhanced degradation of Rhodamine B with piezocatalysis

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Ceramics International 2025年

作者： Chiu, Yen-Lun Chang, Kao-Shuo Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No.1 University Road Tainan City70101 Taiwan Department of Materials Science & Engineering National Cheng Kung University No.1 University Road Tainan City70101 Taiwan

This paper presents a hydrothermal method for fabricating textured BaTiO3 (BTO) nanorod arrays with high crystallinity on fluorine-doped tin oxide (FTO) substrates by applying a polarization treatment to the samples to explore the feasibility of enhancing their piezoelectric properties. The preparation of highly textured BTO nanorod arrays using a two-step hydrothermal process was investigated in detail, including the spin-coating process for depositing the TiO2 seed layer, the influence of solution acidity on the hydrothermal synthesis of TiO2 nanorod arrays, and the formation mechanism of textured BTO nanostructures. The piezoelectric constants (d33) of the samples were determined using piezoresponse force microscopy. S-BTO(P), which has high crystallinity and preferential orientation, achieves a d33 as high as 85.4 p.m./V after poling, which is 3.2 times higher than that without textured structures and poling. Our findings revealed that chemically controlling and inducing a preferential orientation in the crystal structure of piezoelectric materials with a seed layer and specific hydrothermal conditions can significantly enhance their piezoelectric properties after poling, making them excellent candidates for piezoelectric devices. Especially, this study confirms that the piezoelectric-enhanced charge separation in poled BTO nanorod arrays enables efficient generation of reactive species under ultrasonication, leading to effective degradation of RhB. The strong piezocatalytic performance highlights the material's potential for practical applications in environmental pollutant removal. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Piezoelectricity

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Biomimetic natural biomaterials for tissue engineering and regenerative medicine:new biosynthesis methods,recent advances,and emerging applications

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Military Medical Research 2024年第1期11卷 50-79页

作者： Shuai Liu Jiang-Ming Yu Yan-Chang Gan Xiao-Zhong Qiu Zhe-Chen Gao Huan Wang Shi-Xuan Chen Yuan Xiong Guo-Hui Liu Si-En Lin Alec McCarthy Johnson V.John Dai-Xu Wei Hong-Hao Hou Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering the Fifth Affiliated HospitalSchool of Basic Medical ScienceSouthern Medical UniversityGuangzhou 510900China Department of Orthopedics Tongren HospitalShanghai Jiao Tong UniversityShanghai 200336China The Eighth Affiliated Hospital Sun Yat-Sen UniversityShenzhen 518033GuangdongChina Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325011ZhejiangChina Department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Orthopaedics and Traumatology Faculty of Medicinethe Chinese University of Hong KongHong Kong SAR 999077China Department of Functional Materials Terasaki Institute for Biomedical InnovationLos AngelesCA 90064USA Mary&Dick Holland Regenerative Medicine Program College of MedicineUniversity of Nebraska Medical CenterOmahaNE 68130USA Zigong Affiliated Hospital of Southwest Medical University Zigong Psychiatric Research CenterZigong Institute of Brain ScienceZigong 643002SichuanChina Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationSchool of MedicineDepartment of Life Sciences and MedicineNorthwest UniversityXi’an 710127China

Biomimetic materials have emerged as attractive and competitive alternatives for tissue engineering(TE)and regenerative *** contrast to conventional biomaterials or synthetic materials,biomimetic scaffolds based on natural biomaterial can offer cells a broad spectrum of biochemical and biophysical cues that mimic the in vivo extracellular matrix(ECM).Additionally,such materials have mechanical adaptability,micro-structure interconnectivity,and inherent bioactivity,making them ideal for the design of living implants for specific applications in TE and regenerative *** paper provides an overview for recent progress of biomimetic natural biomaterials(BNBMs),including advances in their preparation,functionality,potential applications and future *** highlight recent advances in the fabrication of BNBMs and outline general strategies for functionalizing and tailoring the BNBMs with various biological and physicochemical characteristics of native ***,we offer an overview of recent key advances in the functionalization and applications of versatile BNBMs for TE ***,we conclude by offering our perspective on open challenges and future developments in this rapidly-evolving field.

关键词： Biomimic Scaffold Biosynthesis Natural biomaterial Tissue engineering

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