Nano Letters最新文献_第6页

Ultrahigh-Density Polar Vortex Lattice in Square-Shaped Moiré Bilayers of Lead Chalcogenides 方形莫伊里双层铅钙钛矿中的超高密度极涡晶格

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-11 DOI: 10.1021/acs.nanolett.4c03999

Tao Xu, Tao Qian, Chengsheng Wu, Jingtong Zhang, Jie Wang, Hiroyuki Hirakata, Takayuki Kitamura, Takahiro Shimada

{"title":"Ultrahigh-Density Polar Vortex Lattice in Square-Shaped Moiré Bilayers of Lead Chalcogenides","authors":"Tao Xu, Tao Qian, Chengsheng Wu, Jingtong Zhang, Jie Wang, Hiroyuki Hirakata, Takayuki Kitamura, Takahiro Shimada","doi":"10.1021/acs.nanolett.4c03999","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c03999","url":null,"abstract":"Nanoscale exotic polar topological structures, such as vortices and skyrmions, hold promise for next-generation electronic devices, yet their spontaneous formation in 2D van der Waals (vdW) materials remains quite challenging. Herein, we demonstrate from first-principles that ultrahigh-density polar vortices emerge in the square moiré bilayer formed by twisting two layers of centrosymmetric PbS with the D4h point group. The emerged ferroelectricity arises from the inherent complex strain associated with the twisted structures, and the resulting electron polarization is much greater than that obtained in sliding ferroelectricity. Notably, the engineered strain patterns are characterized by peculiar inhomogeneous in-plane fields with a checkerboard distribution of uniaxial tension. This nanoscale nonuniform strain produces an ultrahigh-density vortex polarization lattice. The results from our study not only reveals a new mechanism for electric polarization and polar topologies in moiré bilayers but also provides opportunities for designing 2D ultrahigh-density electric devices.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tumor Cell-Specific Signal Processing Platform Controlled by ATP for Non-invasive Modulation of Cellular Behavior 由 ATP 控制的肿瘤细胞特异性信号处理平台，用于无创调节细胞行为

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-11 DOI: 10.1021/acs.nanolett.4c04445

Guofang Zhang, Shuzhen Yue, Hongyan Geng, Xin-yan Wang, Tian Tian, Zhumei Cui, Sai Bi

{"title":"Tumor Cell-Specific Signal Processing Platform Controlled by ATP for Non-invasive Modulation of Cellular Behavior","authors":"Guofang Zhang, Shuzhen Yue, Hongyan Geng, Xin-yan Wang, Tian Tian, Zhumei Cui, Sai Bi","doi":"10.1021/acs.nanolett.4c04445","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04445","url":null,"abstract":"Regulating the spatial distribution of membrane receptors can artificially reprogram cellular behaviors, which play a critical biological role in various physiological and pathological processes. Herein, we construct a tumor cell-specific signal processing platform (TCS-SPP) for controlled promotion/inhibition of cellular-mesenchymal epithelial transition factor (c-Met) receptor dimerization to noninvasively modulate cellular behaviors. Upon the dual-aptamer recognition in the upstream input signal circuit (UISC) to discriminate target cancer cells, the membrane-anchored DNA signal processor (DSP) is activated for signal amplification via rolling circle amplification (RCA) followed by the working of an ATP molecular switch for signal conversion, achieving receptor modulation in the downstream output signal circuit (DOSC). Benefiting from the rigid structure of DSP, the protective effect, and spatial confinement effect of RCA products, this TCS-SPP has demonstrated good performance in accurately modulating cellular behavior such as cell migration, invasion, and proliferation, showing great potential for targeted cancer therapy and biomedical engineering applications.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrically Controlled Excitons, Charge Transfer Induced Trions, and Narrowband Emitters in MoSe2–WSe2 Lateral Heterostructure MoSe2-WSe2 侧向异质结构中的电控激子、电荷转移诱导的三离子和窄带发射器

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-11 DOI: 10.1021/acs.nanolett.4c03464

Baisali Kundu, Priyanka Mondal, David Tebbe, Md. Nur Hasan, Suman Kumar Chakraborty, Marvin Metzelaars, Paul Kögerler, Debjani Karmakar, Gopal K. Pradhan, Christoph Stampfer, Bernd Beschoten, Lutz Waldecker, Prasana Kumar Sahoo

{"title":"Electrically Controlled Excitons, Charge Transfer Induced Trions, and Narrowband Emitters in MoSe2–WSe2 Lateral Heterostructure","authors":"Baisali Kundu, Priyanka Mondal, David Tebbe, Md. Nur Hasan, Suman Kumar Chakraborty, Marvin Metzelaars, Paul Kögerler, Debjani Karmakar, Gopal K. Pradhan, Christoph Stampfer, Bernd Beschoten, Lutz Waldecker, Prasana Kumar Sahoo","doi":"10.1021/acs.nanolett.4c03464","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c03464","url":null,"abstract":"Controlling excitons and their transport in two-dimensional (2D) transition metal dichalcogenide heterostructures is central to advancing photonics and electronics on-chip integration. We investigate the controlled generation and manipulation of excitons and their complexes in monolayer MoSe2–WSe2 lateral heterostructures (LHSs). Incorporating graphene as a back gate and edge contact in a field-effect transistor geometry, we achieve the precise electrical tuning of exciton complexes and their transfer across interfaces. Photoluminescence and photocurrent maps at 4 K reveal the synergistic effect of the local electric field and interface phenomena in the modulation of excitons, trions, and free carriers. We observe spatial variations in the exciton and trion densities driven by exciton–trion conversion under electrical manipulation. Additionally, we demonstrate controlled narrow-band emissions within the LHS through carrier injection and electrical biasing. Density functional theory calculation reveals significant band modification at the lateral interfaces. This work advances exciton manipulation in LHS and shows promise for next-generation 2D quantum devices.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fine Engineering of d-Orbital Vacancies of ZnN4 via High-Shell Metal and Nonmetal Single-Atoms for Efficient and Poisoning-Resistant ORR 通过高壳金属和非金属单原子精细设计 ZnN4 的 d 轨道空位，实现高效抗中毒 ORR

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c02830

Xiaoyuan Sun, Xinyi Li, Hong Huang, Wenting Lu, Xiaochun Xu, Xiaoqiang Cui, Lu Li, Xiaoxin Zou, Weitao Zheng, Xiao Zhao

{"title":"Fine Engineering of d-Orbital Vacancies of ZnN4 via High-Shell Metal and Nonmetal Single-Atoms for Efficient and Poisoning-Resistant ORR","authors":"Xiaoyuan Sun, Xinyi Li, Hong Huang, Wenting Lu, Xiaochun Xu, Xiaoqiang Cui, Lu Li, Xiaoxin Zou, Weitao Zheng, Xiao Zhao","doi":"10.1021/acs.nanolett.4c02830","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c02830","url":null,"abstract":"Atomically dispersed metal–nitrogen–carbon (M–N–C) materials are active oxygen reduction reaction (ORR) catalysts. Among M–N–C catalysts, ZnN4 single-atom catalysts (SACs) due to a nearly full 3d10 electronic configuration insufficiently activate oxygen and display low ORR activity. To finely engineer d-orbital vacancies of ZnN4, we combine high-shell metal and nonmetal SAs as electronic regulators that are ZnN4Cl and carbon vacancy-hosted −Cl motifs, which show complementary electron-withdrawing capacities versus the ZnN4. Under that, the ZnN4 exhibits significantly enhanced ORR activity with a half-wave potential (E1/2) of 0.912 VRHE relative to the unmodified ZnN4 (E1/2 = 0.822 VRHE) and simultaneously robust durability (negligible activity loss after 10,000 potential cycles). Particularly, the engineered ZnN4 possesses high resistance to SCN– poisoning, which is rarely achieved among M–N–C SACs. Our works show that combining high-shell metal and nonmetal SAs can finely engineer d-orbital vacancies of metal centers to an optimal state, thereby intrinsically enhancing their catalytic performance.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biomineralization Inspired the Construction of Dense Spherical Stacks for Dendrite-Free Zinc Anodes 生物矿化启发构建无枝晶锌阳极的致密球形堆栈

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c03749

Zhikun Guo, Zeping Liu, Pengyu Wang, Chenyang Zhao, Xingyuan Lu, Yu Zhang, Naiqing Zhang

引用次数: 0

A Bottom-Up Approach to Assemble Cell-Laden Biomineralized Nanofiber Mats into 3D Multilayer Periosteum Mimics for Bone Regeneration 一种自下而上的方法，将含有细胞的生物矿化纳米纤维垫组装成三维多层骨膜模拟物，用于骨再生

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c02561

Luoqiang Tian, Xiangrong Zhao, Fuying Chen, Fengxin Zhao, Keting Liu, Jiajun Liu, Qiwen Wan, Xiangfeng Li, Xiangdong Zhu, Xuening Chen, Xingdong Zhang

{"title":"A Bottom-Up Approach to Assemble Cell-Laden Biomineralized Nanofiber Mats into 3D Multilayer Periosteum Mimics for Bone Regeneration","authors":"Luoqiang Tian, Xiangrong Zhao, Fuying Chen, Fengxin Zhao, Keting Liu, Jiajun Liu, Qiwen Wan, Xiangfeng Li, Xiangdong Zhu, Xuening Chen, Xingdong Zhang","doi":"10.1021/acs.nanolett.4c02561","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c02561","url":null,"abstract":"The creation of complex multilayer periosteal graft structures is challenging. This study introduced a novel bottom-up approach to assemble cell-laden nanofiber mats into a three-dimensional (3D) multilayer periosteum mimic, successfully replicating the hierarchical complexity of the natural periosteum. These nanofiber mats, which were fabricated by electrospinning, surface modification, and stimulated body fluid (SBF) immersion, are composed of nanoscale polycaprolactone (PCL) fibers coated with a mineralized collagen layer along the fiber orientation. They closely resembled the natural periosteal matrix, thereby promoting osteogenic differentiation of rat bone marrow mesenchymal stem cells (rBMSCs) in vitro. The biomimetic periosteum, constructed via layer-by-layer assembly, offered advantages such as a multilayer nanofibrous structure, controlled cell distribution, a reservoir for osteoprogenitors, and enhanced pro-osteogenic potential. The rat calvarial bone defect model confirmed its potent bone repair capacity. This study presents an efficient approach to construct tissue-engineered periosteum mimics, holding promise for serving as periosteal grafts in orthopedic applications.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Conductivity in Biphasic Silicon Nanowires 双相硅纳米线的导热性

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c03720

Samik Mukherjee, Zhongwei Zhang, Marcin Wajs, Maria Chiara Spadaro, M. Gonzalez-Catala, Uri Givan, Stephan Senz, Jordi Arbiol, Sebastien Francoeur, Sebastian Volz, Oussama Moutanabbir

{"title":"Thermal Conductivity in Biphasic Silicon Nanowires","authors":"Samik Mukherjee, Zhongwei Zhang, Marcin Wajs, Maria Chiara Spadaro, M. Gonzalez-Catala, Uri Givan, Stephan Senz, Jordi Arbiol, Sebastien Francoeur, Sebastian Volz, Oussama Moutanabbir","doi":"10.1021/acs.nanolett.4c03720","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c03720","url":null,"abstract":"The work unravels the previously unexplored atomic-scale mechanism involving the interaction of phonons with crystal homointerfaces. Silicon nanowires with engineered isotopic content and crystal phases were chosen for this investigation. Crystal polytypism, manifested by the presence of both diamond cubic and rhombohedral phases within the same nanowire, provided a testbed to study the impact of phase homointerfaces on phonon transport. The lattice thermal conductivity and its temperature response were found to be markedly different in the presence of polytypism. Its origin, however, was not traced to any acoustic mismatch as the polytypic nanowires presented a similar phonon spectrum as their counterparts. Rather, phenomenological modeling and atomistic simulations identified and quantified the role of atomically rough homointerfaces and the subsequent phonon scattering from such homointerfaces in shaping the phonon behavior. This framework provides the inputs necessary to advance the design and modeling of phonon transport in nanoscale semiconductors.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing the Self-Healing Efficiency of Ti3AlC2 MAX Phase via Irradiation 通过辐照提高 Ti3AlC2 MAX 相的自愈效率

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c04840

Junfeng Cui, Lei Zhang, Xiaofei Hu, Yingying Yang, Jie Sun, Youbing Li, Guoxin Chen, Chun Tang, Peiling Ke

{"title":"Enhancing the Self-Healing Efficiency of Ti3AlC2 MAX Phase via Irradiation","authors":"Junfeng Cui, Lei Zhang, Xiaofei Hu, Yingying Yang, Jie Sun, Youbing Li, Guoxin Chen, Chun Tang, Peiling Ke","doi":"10.1021/acs.nanolett.4c04840","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04840","url":null,"abstract":"Self-healing materials are highly desirable in the nuclear industry to ensure nuclear security. Although extensive efforts have been devoted to developing self-healing materials in the past half century, very limited successes have been reported for ceramics or metals. Here, we report an intrinsic self-healing material of Ti3AlC2 MAX phase, which exhibits both ceramic and metallic properties, and a strategy for further enhancing the self-healing via irradiation is proposed. Quantitative in situ transmission electron microscopy tensile testing reveals that the fracture strength of 1.58 GPa is achieved on thoroughly fractured Ti3AlC2, corresponding to the self-healing efficiency of 19.8%, which is increased to 28.1% after irradiation. In situ irradiation experiments, atomic-resolution characterizations, and molecular dynamics simulations reveal that spontaneous rebonding of partial atoms on fracture surfaces is responsible for the self-healing, and irradiation-enhanced atomic migration, interplanar spacing increment, and gap-filling contribute to the self-healing enhancement.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anodization-Processed Colored Radiative Thermoregulatory Film 阳极氧化处理彩色辐射热调节膜

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c04073

Shixiong Yu, Yuetong Zhou, Peijia Bai, Quan Zhang, Wenlong Cui, Boxiao Zhang, Rujun Ma

引用次数: 0

Sub-100 fs Formation of Dark Excitons in Monolayer WS2 单层 WS2 中亚 100 fs 暗激子的形成

IF 10.8 1区材料科学

Nano Letters Pub Date : 2024-11-08 DOI: 10.1021/acs.nanolett.4c03807

Pavel V. Kolesnichenko, Lukas Wittenbecher, Qianhui Zhang, Run Yan Teh, Chandni Babu, Michael S. Fuhrer, Anders Mikkelsen, Donatas Zigmantas

{"title":"Sub-100 fs Formation of Dark Excitons in Monolayer WS2","authors":"Pavel V. Kolesnichenko, Lukas Wittenbecher, Qianhui Zhang, Run Yan Teh, Chandni Babu, Michael S. Fuhrer, Anders Mikkelsen, Donatas Zigmantas","doi":"10.1021/acs.nanolett.4c03807","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c03807","url":null,"abstract":"Two-dimensional semiconducting transition metal dichalcogenides are promising materials for optoelectronic applications due to their strongly bound excitons. While bright excitons have been thoroughly scrutinized, dark excitons have been much less investigated, as they are not directly observable with far-field spectroscopy. However, with their nonzero momenta, dark excitons are significant for applications requiring long-range transport or coupling to external fields. We access such dark excitons in WS2 monolayer using transient photoemission electron microscopy with subdiffraction limited spatial resolution (75 nm) and exceptionally high temporal resolution (13 fs). Image time series of the monolayer are recorded at several different fluences. We directly observe the ultrafast formation of dark K-Λ excitons occurring within 14–50 fs and follow their subsequent picosecond decay. We distinguish exciton dynamics between the monolayer’s interior and edges and conclude that the picosecond-scale evolution of dark excitations is defect-mediated while intervalley scattering is not affected by the defects.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0