Nano Letters最新文献_第2页

Chemical Short-Range Ordering in Nanoprecipitates Modulates Planar Faults to Enhance Mechanical Properties 纳米沉淀物中的化学短程有序调节平面故障以提高力学性能

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-25 DOI: 10.1021/acs.nanolett.5c01602

Qing Zhang, Yixuan Hu, Tao Yang, Han Chen, Yuto Ito, Daisuke Egusa, Eiji Abe, Qiwei Shi, Gang Ji, Yuchi Cui, Xiaodong Wang, Zhe Chen

{"title":"Chemical Short-Range Ordering in Nanoprecipitates Modulates Planar Faults to Enhance Mechanical Properties","authors":"Qing Zhang, Yixuan Hu, Tao Yang, Han Chen, Yuto Ito, Daisuke Egusa, Eiji Abe, Qiwei Shi, Gang Ji, Yuchi Cui, Xiaodong Wang, Zhe Chen","doi":"10.1021/acs.nanolett.5c01602","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01602","url":null,"abstract":"Nanoprecipitates strengthen metallic materials by impeding dislocation motion, but they often compromise ductility. This study introduces a novel strategy to address this challenge by incorporating atomic-scale chemical heterogeneity within nanoprecipitates. For the first time, pronounced short-range ordering (SRO) within L12-ordered precipitates of the Co40Ni30Cr20Al5Ti4Ta1 multi-principal element alloy is observed and confirmed, with its formation mechanism elucidated via density functional theory. Experimental and computational results show that the unique atomic configuration reshapes the energy landscape of planar defects, enhancing the strength and work-hardening capacity. The SRO structure elevates the critical shear stress for dislocation-mediated precipitate shearing while reducing the formation energy of superlattice intrinsic stacking faults, thereby promoting nucleation site formation. This work pioneers a method for modulating atomic-scale heterogeneity within ordered structures, advancing high-performance material design.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"7 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876379","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

Topology-Dependent Enhancement of Pyroelectric Property in Nanoarchitected GaN Metamaterials 纳米结构GaN超材料热释电性能的拓扑依赖性增强

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c01586

Jun Cai, Benyamin Shahryari, Alireza Seyedkanani, Agus P. Sasmito, Abdolhamid Akbarzadeh

{"title":"Topology-Dependent Enhancement of Pyroelectric Property in Nanoarchitected GaN Metamaterials","authors":"Jun Cai, Benyamin Shahryari, Alireza Seyedkanani, Agus P. Sasmito, Abdolhamid Akbarzadeh","doi":"10.1021/acs.nanolett.5c01586","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01586","url":null,"abstract":"Pyroelectric materials exhibit spontaneous polarization in response to temperature fluctuations, a phenomenon known as the pyroelectric effect. This study investigates the pyroelectric properties of nanoarchitected gallium nitride (GaN) metamaterials with distinctive topologies, i.e., body-centered cube, octet truss, gyroid, and spinodoid, using molecular dynamics simulations. Our findings reveal a topology-dependent enhancement in the pyroelectric coefficient, primarily affected by the piezoelectric stress constant and thermal expansion coefficient. We demonstrate that decreasing the relative density further enhances the pyroelectric coefficient due to an increased surface-to-volume ratio that enhances the surface effects. Finally, we compute the pyroelectric figures of merit for thermal energy harvesting application, highlighting the superior pyroelectric performance of nanoarchitected GaN metamaterials compared to bulk GaN and GaN nanowires. These results underscore the potential of nanoscale topology engineering in the field of pyroelectricity for realizing next-generation nanogenerators, thermal imaging devices, and self-powered nanosensors.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"1 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872557","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

Gradient Structured Separator Enables Stable Aqueous Zinc Metal Batteries 梯度结构分离器使水锌金属电池稳定

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c01125

Zehua Zhao, Yan Zhang, Huandi Zhang, Xiaowei Shi, Haitao Zhao, Junpeng Liu, Jiamei Liu, Lei Li

引用次数: 0

In Situ Multiscale Study of Iron Oxidation at High Temperatures 高温下铁氧化的原位多尺度研究

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c00025

Wei Tu, Zhen Zeng, Yongjian Zhao, Zhenghao Jia, Caixia Meng, Wei Liu, Xianhu Sun, Jianyu Huang

{"title":"In Situ Multiscale Study of Iron Oxidation at High Temperatures","authors":"Wei Tu, Zhen Zeng, Yongjian Zhao, Zhenghao Jia, Caixia Meng, Wei Liu, Xianhu Sun, Jianyu Huang","doi":"10.1021/acs.nanolett.5c00025","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00025","url":null,"abstract":"Although high-temperature oxidation of metals results in significant failure of structure materials, in situ understanding of these processes and developing improved strategies are still very limited. Herein, using environmental scanning electron microscopy (ESEM), environmental transmission electron microscopy (ETEM), and X-ray photoelectron spectroscopy (XPS), we report the in situ dynamic high-temperature oxidation behaviors of iron in O2, H2O, and O2 + H2O atmospheres, respectively. The results demonstrate that an oxygen-rich environment (1.6 mbar) leads to transient formation of polycrystalline Fe3O4 without passivation effects on further oxidation, while sparse oxygen environments (10–3 mbar) promote formation of a uniform thin passivation layer of Fe3O4, protecting itself from further oxidation in ambient air. In contrast to O2, the H2O vapor accelerates oxidation, and the products consist of Fe3O4 and FeOOH. These in situ results give insights into designing technically universal antioxidation strategies.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"26 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867253","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

Highly Sensitive Wearable Chromic Force Sensor Utilizing In-Plane Anisotropy in Polydiacetylene Mechanochromism 利用聚二乙炔机械变色的面内各向异性的高灵敏度可穿戴色力传感器

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c00085

Jianlu Zheng, Jiali Chen, Massimiliano Galluzzi, Yuge Hou, Kaori Sugihara

引用次数: 0

Collective Electricity Generation over the Kilovolt Level from Water Droplets 超过千伏水平的水滴集体发电

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c01064

Wei Deng, Yufeng Zhu, Kelan Zhang, Yuxuan Yuan, Tao Hu, Xiao Wang, Jidong Li, Xuemei Li, Zhuhua Zhang, Wanlin Guo, Jun Yin

引用次数: 0

Keto-Oxygen on Graphitic Surface with Downshifted p-Band Center Achieves Efficient Metal-Free Transfer Hydrogenation of Nitroarenes 降p带中心石墨表面的酮氧实现了硝基芳烃的高效无金属转移加氢

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c01614

Rongjian Ding, Ting Zhang, Yanling Zhai, Haijie Cao, Zhijun Zhu, Xiaoquan Lu

{"title":"Keto-Oxygen on Graphitic Surface with Downshifted p-Band Center Achieves Efficient Metal-Free Transfer Hydrogenation of Nitroarenes","authors":"Rongjian Ding, Ting Zhang, Yanling Zhai, Haijie Cao, Zhijun Zhu, Xiaoquan Lu","doi":"10.1021/acs.nanolett.5c01614","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01614","url":null,"abstract":"The critical challenge in utilizing carbon-based nanomaterials is identifying the active site. Herein, we demonstrate the keto-oxygen on the graphitic surface as active sites for catalytic transfer hydrogenation (CTH) and present an efficient nanocrystalline diamond (ND)-derived carbon-based catalyst for metal-free CTH of nitroarenes to imine with 99.9% nitrobenzene conversion and exclusive selectivity (99.9%). By selectively deconstructing the graphitic surface or eliminating carbonyl groups, the graphite-conjugated carbonyl group is confirmed as the catalytically active site. Moreover, kinetic studies display the lower activation barrier of benzylalcohol than that of nitrobenzene (88.8 vs 119.1 kJ mol–1, respectively), indicating that alcohol dehydrogenation occurs prior to the activation of nitrobenzene. Density functional theory calculations reveal the downshifted p-band center of keto-oxygen on the sp2 hybrid C surface affords moderate adsorption of benzaldehyde intermediates, which accelerates the formation of active H for the following hydrogenation step and is responsible for the high catalytic activity.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"7 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872558","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

Interplay of Ultrafast Electron–Phonon and Electron–Electron Scattering in Ti3C2Tx MXenes: Ab Initio Quantum Dynamics Ti3C2Tx MXenes中超快电子-声子和电子-电子散射的相互作用：从头算量子动力学

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c01242

Shiying Shen, Haoran Lu, Shriya Gumber, Oleg V. Prezhdo, Run Long

{"title":"Interplay of Ultrafast Electron–Phonon and Electron–Electron Scattering in Ti3C2Tx MXenes: Ab Initio Quantum Dynamics","authors":"Shiying Shen, Haoran Lu, Shriya Gumber, Oleg V. Prezhdo, Run Long","doi":"10.1021/acs.nanolett.5c01242","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01242","url":null,"abstract":"Nonthermal electrons are vital in solar energy and optoelectronics, yet their relaxation pathways are not fully understood. Ab initio quantum dynamics reveal that in Ti3C2O2 electron–phonon (e-ph) relaxation is faster than electron–electron (e-e) scattering due to strong coupling with the A1g phonon at 190 cm–1 and the presence of light C and O atoms. Nuclear quantum effects are minimal; vibrations influence e-e scattering only indirectly, and the A1g mode’ zero-point energy is much lower than thermal energy at ambient conditions. Substituting O with heavier S in Ti3C2OS slows e-ph relaxation and enhances e-e scattering, making it a faster process. However, both channels proceed concurrently, challenging the e-e and e-ph time scale separation often used for metals. These results underscore the need for atomistic-level understanding of nonthermal electron dynamics, especially in light-element systems such as MXenes, and provide guidance for optimizing electronic relaxation in advanced optoelectronic materials and devices.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"97 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872721","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

2D Materials in Logic Technology: Power Efficiency and Scalability in 2DM-MBC CFET 逻辑技术中的二维材料：2DM-MBC CFET的功率效率和可扩展性

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.5c01061

Seung Heon Shin, Dong-Ho Kang, Hoon Hahn Yoon, Jin Young Park, Minuk Song, Hyeonchang Son, Daewon Ha, Hyeon-Jin Shin

引用次数: 0

Layered Germanium–Selenium Compounds as Phonon–Glass Electron–Crystals: A Pathway to Enhance the Thermoelectric Performance 层状锗硒化合物声子-玻璃电子晶体：提高热电性能的途径

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-24 DOI: 10.1021/acs.nanolett.4c06620

Zhen Tong, Yatian Zhang, Thomas Frauenheim, Traian Dumitrică

{"title":"Layered Germanium–Selenium Compounds as Phonon–Glass Electron–Crystals: A Pathway to Enhance the Thermoelectric Performance","authors":"Zhen Tong, Yatian Zhang, Thomas Frauenheim, Traian Dumitrică","doi":"10.1021/acs.nanolett.4c06620","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c06620","url":null,"abstract":"The early concept of a “phonon–glass electron–crystal” for enhancing the thermoelectric figure of merit (ZT) is explored theoretically in layered Ge–Se crystals, where phonon transport exhibits glass-like behavior. Ab initio lattice dynamics and the rigid electronic band method project an ultrahigh ZT = 4.04 at 1000 K along the a axis in the high-temperature GeSe2 phase at an electron doping concentration of 1020 cm–3. Meanwhile, the low-temperature Ge4Se9 phase achieves a high ZT = 2.19 at 600 K along the a axis with an electron doping concentration of 6 × 1019 cm–3. These maximal values reflect the ultralow lattice thermal conductivity, 0.168 W m–1 K–1 (GeSe2, 1000 K) and 0.289 W m–1 K–1 (Ge4Se9, 600 K), and high power factor at optimized carrier concentrations along the a axis. Our calculations indicate a promising pathway for approaching the early concept of maximizing ZT, by tailoring carrier doping in layered crystals with glass-like phononic transport.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"69 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872553","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