Applied Physics Letters最新文献_第6页

Tailoring Pt nanoboxes with Bi atoms and SnO2 adatoms for efficient hydrogen evolution electrocatalysis 用Bi原子和SnO2原子裁剪Pt纳米盒用于高效析氢电催化

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-21 DOI: 10.1063/5.0267209

Xianglong Liu, Shuiping Luo, Zhaojie Tan, Wen Chen, Jing-Li Luo, Long Zhang, Hui Wang

{"title":"Tailoring Pt nanoboxes with Bi atoms and SnO2 adatoms for efficient hydrogen evolution electrocatalysis","authors":"Xianglong Liu, Shuiping Luo, Zhaojie Tan, Wen Chen, Jing-Li Luo, Long Zhang, Hui Wang","doi":"10.1063/5.0267209","DOIUrl":"https://doi.org/10.1063/5.0267209","url":null,"abstract":"Engineering Pt-based nanocrystals at the atomic scale holds promise for achieving high-performance electrocatalysts, yet it remains challenging for multimetallic and hierarchical nanostructures. Herein, based on the PtSnBi intermetallic nanoplates with intrinsically isolated Pt, Sn, and Bi atoms, we present the rational design and synthesis of face-centered cubic (fcc) Pt nanoboxes, incorporating dilute Bi atoms within the lattice and SnO2 adatoms on the surface, to enhance acidic hydrogen evolution reaction (HER) electrocatalysis. The prepared SnO2@fcc-Pt0.9Bi0.1 catalyst exhibits ultralow overpotentials of 18.2 and 42.7 mV at 10 and 100 mA cm−2, respectively, accompanied by a favorable Tafel slope of 29.1 mV dec−1. Furthermore, it exhibits high stability, as evidenced by its well-maintained performance at 100 mA cm−2 for 24 h. Experimental characterization combined with density functional theory calculations indicates that hollow geometric engineering, Bi doping, and SnO2 surface modification collectively modulate the electronic structure of the active site and optimize the adsorption strength of hydrogen. Additionally, the engineering of Pt nanoboxes also enhances reaction kinetics, improves intrinsic per-site activity, and expands active surface areas. This work develops a strategy for engineering Pt-based catalysts to improve their HER performance.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"15 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of oxygen vacancy-gradient surface layer on the electrostrain of Sb3+ doped BNKST ceramics 氧空位梯度面层对Sb3+掺杂BNKST陶瓷电应变的影响

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-21 DOI: 10.1063/5.0271329

Jianhui Jia, Pengrong Ren, Kexuan Zhao

{"title":"Impact of oxygen vacancy-gradient surface layer on the electrostrain of Sb3+ doped BNKST ceramics","authors":"Jianhui Jia, Pengrong Ren, Kexuan Zhao","doi":"10.1063/5.0271329","DOIUrl":"https://doi.org/10.1063/5.0271329","url":null,"abstract":"Recently, ultra-large electrostrain exceeding 1% has been observed in various thin ferroelectric ceramics, generating a significant research interest. However, the underlying mechanisms remain controversial. In this work, electrostrain, along with the dielectric and ferroelectric properties of {(K0.2Na0.8)0.5Bi0.5}0.96Sr0.04SbxTi1−xO3−x/2 ceramics, was investigated, and all of them feature a sample's thickness (t) dependence. As t decreased from 0.4 to 0.1 mm, both the permittivity (ε′) and loss tangent (tanδ) diminished, and the maximum polarization (Pmax) decreased, while the electrostrain (S) exhibited a significant increase. X-ray diffraction and x-ray photoelectron spectroscopy analyses revealed structural differences between the bulk and the surface of the ceramics, and surface reconstruction during the poling process. Based on these findings, we propose that the thickness-dependent electric properties are related to hopping oxygen vacancies, which forms an oxygen vacancy-gradient layer on the ceramic surface under the applied electric field. Our work is conducive to understanding the thickness-dependent properties recently discovered in piezoelectric ceramics.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"127 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

VRP-LiDAR: A compact full-Stokes polarimetric LiDAR utilizing vortex retarders VRP-LiDAR：一种紧凑的全斯托克斯偏振激光雷达，利用涡旋缓速器

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0262583

Kaihua Zhao, Haonan Shi, Weijun Meng, Haofeng Hu, Xiaobo Li

引用次数: 0

Size-dependent localized acoustic vibrations in MoS2 thin film with patterned nanohole arrays 具有图案纳米孔阵列的二硫化钼薄膜中与尺寸相关的局部声振动

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0267546

Kun Gao, Jiaqi Zhang, Kuai Yu, Guo Ping Wang

{"title":"Size-dependent localized acoustic vibrations in MoS2 thin film with patterned nanohole arrays","authors":"Kun Gao, Jiaqi Zhang, Kuai Yu, Guo Ping Wang","doi":"10.1063/5.0267546","DOIUrl":"https://doi.org/10.1063/5.0267546","url":null,"abstract":"The study of coherent acoustic vibrations in nanostructured materials, particularly in two-dimensional (2D) semiconductors, has gained significant interest due to their potential applications in sensing, energy conversion, and nanoscale acoustic devices. While much of the research has focused on 2D transition metal dichalcogenides (TMDs), the effect of nanoscale patterning on the vibrational properties of TMDs remains less explored. Here, we investigate the coherent acoustic vibrations in MoS2 thin films with patterned nanohole arrays, excited by femtosecond laser pulses. Using pump–probe spectroscopy and finite element simulations, we explore the size-dependent vibrational frequencies of the nanohole arrays. The experimental results reveal two distinct vibrational modes: a thickness-dependent out-of-plane breathing mode of the MoS2 thin films, and a low-frequency mode corresponding to the in-plane periodic deformation of the nanoholes. The study highlights the size-dependent vibrational frequencies of the nanoholes, showing excellent agreement between experiments and simulations. These findings provide valuable insights into phonon engineering in 2D materials, enabling control over both in-plane and out-of-plane vibrational properties. This work paves the way for designing nanomechanical resonators and acoustic sensors based on 2D semiconductors.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"40 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous thermal conductivity anisotropy in bulk hexagonal AlN induced by structural phase transition 结构相变引起的体六方AlN的异常导热系数各向异性

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0271507

Yue Wang, Anping Liu, Xiaolong Yang, Xiaoyuan Zhou

{"title":"Anomalous thermal conductivity anisotropy in bulk hexagonal AlN induced by structural phase transition","authors":"Yue Wang, Anping Liu, Xiaolong Yang, Xiaoyuan Zhou","doi":"10.1063/5.0271507","DOIUrl":"https://doi.org/10.1063/5.0271507","url":null,"abstract":"Hexagonal aluminum nitride (h-AlN), an ultrawide bandgap semiconductor with exceptional thermal conductivity, holds great promise for applications in power electronics and optoelectronics. Prior studies have shown that AlN undergoes a transition from the wurtzite structure (wz-AlN) to hexagonal magnesium oxide (h-MgO) structure under pressure. However, a thorough understanding of the thermal transport properties of these two hexagonal phases has yet to be established. Herein, we look into this issue by combining the first-principles calculations with phonon Boltzmann transport theory. With the inclusion of four-phonon scattering and phonon renormalization, we predict that the thermal conductivity (κ) of wz-AlN is 291 and 268 W/mK for the in-plane and out-of-plane directions at room temperature, respectively, showing good agreement with experimental measurements. In contrast, the h-MgO phase exhibits a significantly lower thermal conductivity, with the in-plane value of 50 W/mK and the out-of-plane value of 93 W/mK. Through further analysis of modal phonon transport and chemical bonding, we attribute the lower κ of h-MgO-AlN to its stronger anharmonicity resulting from the weaker Al–N bonding. More importantly, we uncover that the h-MgO phase exhibits unusual κ anisotropy with the out-of-plane κ being almost twice as high as the in-plane value, in stark contrast to the common behavior observed in wurtzite crystals. This anomaly is found to arise from the phase transition-induced strengthening of interlayer bonding. This work provides a fundamental understanding of the thermal transport behavior of hexagonal bulk AlN during the structural phase transition.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"14 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A stretchable thermoacoustic sounder based on vertical graphene 一种基于垂直石墨烯的可拉伸热声测深仪

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0257498

Kangxin Shen, Caihao Deng, Baozhong Chen, Simeng Gong, Minghui Li, Jintao Xu, Bo Huang, Huimin Su, Qi Zhou, Linfeng Lan

引用次数: 0

Reconfigurable multifunctional acoustic metagratings enabled by local phase harnessing 通过局部相位控制实现可重构多功能声学超聚合

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0252106

Yu Chen, Jiaqi Quan, Yue Gao, Baoyin Sun, Feng Gao, Yangyang Fu, Yadong Xu

{"title":"Reconfigurable multifunctional acoustic metagratings enabled by local phase harnessing","authors":"Yu Chen, Jiaqi Quan, Yue Gao, Baoyin Sun, Feng Gao, Yangyang Fu, Yadong Xu","doi":"10.1063/5.0252106","DOIUrl":"https://doi.org/10.1063/5.0252106","url":null,"abstract":"Metasurfaces and metagratings show significant potential in revolutionizing acoustic devices, with applications spanning areas such as structural health monitoring and communication. Nevertheless, most previous metasurfaces are realized with limited single functions, as well as complicated structures or low transformation efficiency, leaving the reconfigurable mode-transition reflective metagratings with high efficiency largely uncharted. Here, we propose a distinctly reconfigurable phase-gradient metagrating (PGM) for wave reflection manipulations. We demonstrate that by harnessing only the local phase in the PGM, multi-functionalities can be achieved, including a transition from the perfect retro-reflection to perfect specular reflection. Moreover, we illustrate the robust full-angle incidence response for the reflection conversion enabled by the PGM. These results have been confirmed by the consistent results of theory, simulations, and experiments. The proposed reconfigurable PGM with its simple design, not only broadens the fundamental understanding of diffraction order transitions but also provides an alternative avenue for acoustic applications such as multi-functional information processing.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"18 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-domain modeling of nonlinear counter-propagating wave dynamics in reflective microring resonators 反射微环谐振器中非线性反传播波动力学的时域建模

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0261147

Jean-Michel Vallée, Wei Shi

引用次数: 0

Dynamic tuning of surface lattice resonances via mechano-optical coupling in flexible nanoring metasurfaces 柔性纳米环超表面中机械-光学耦合对表面晶格共振的动态调谐

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0267314

Wei Tao, Jonas Haas, Yuyang Wu, P. Christian Simo, William d'Orsonnens, Abdelhamid Hmima, Florian Laible, Jannik Meyer, Thomas Maurer, Monika Fleischer

{"title":"Dynamic tuning of surface lattice resonances via mechano-optical coupling in flexible nanoring metasurfaces","authors":"Wei Tao, Jonas Haas, Yuyang Wu, P. Christian Simo, William d'Orsonnens, Abdelhamid Hmima, Florian Laible, Jannik Meyer, Thomas Maurer, Monika Fleischer","doi":"10.1063/5.0267314","DOIUrl":"https://doi.org/10.1063/5.0267314","url":null,"abstract":"Flexible metasurfaces comprising arrays of sub-wavelength thick nanoparticles embedded in soft and transparent substrates have attracted significant research interest due to their ability to generate predictable, tunable, and reversible optical performances. In this work, we employ electron beam lithography combined with wet-etching techniques to fabricate flexible metasurfaces of gold elliptical nanorings arranged in square or triangular arrays on polydimethylsiloxane. Scanning electron microscope tests conducted on the soft substrate demonstrate the feasibility of the pattern transfer technique at the nanoscale, as well as the reliability of the in situ optical characterization. Continuous monitoring of reflectance under strain, complemented by numerical simulations and theoretical analysis, reveals intriguing optical behaviors for these metasurfaces, including Fano features in surface lattice resonances, spectral blueshifts in localized surface plasmonic resonances, and color changes from purple to green and orange. By integrating metasurfaces with different characteristics into a chessboard-like pattern, we propose the configuration of a flexible strain map for contactless investigation of localized surface strain, which also provides opportunities for information encryption by encoding the varied resonances under strain.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"2 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machine learning coupled highly sensitive and robust polyvinylidene fluoride thin-film sensor for wearable motion recognition 用于穿戴式运动识别的机器学习耦合高灵敏度和鲁棒性聚偏氟乙烯薄膜传感器

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-20 DOI: 10.1063/5.0261792

Qiaobang Xiang, Haofeng Qiu, Duo Yang, Wei Xue, Ningbo Liao

{"title":"Machine learning coupled highly sensitive and robust polyvinylidene fluoride thin-film sensor for wearable motion recognition","authors":"Qiaobang Xiang, Haofeng Qiu, Duo Yang, Wei Xue, Ningbo Liao","doi":"10.1063/5.0261792","DOIUrl":"https://doi.org/10.1063/5.0261792","url":null,"abstract":"Emerging applications in the field of health monitoring and exoskeleton robotics have led to an urgent demand for high-performance body motion recognition. However, the available motion recognition systems face challenges due to shortcomings including high cost, complex structure, low accuracy, and poor reliability. This work demonstrates a flexible, sensitive, and robust polyvinylidene fluoride (PVDF) composite thin-film sensor with enhanced piezoelectric polarization effect for highly efficient human motion recognition. The thin-film sensor presents a high sensitivity of 27.06 KPa−1 and piezoelectric voltage of 8.7 V, together with a broad detection range of 0.01–3 MPa and low attenuation of 5.6% after 30 000 loading cycles, which are superior to those of many of the reported piezoelectric sensors and commercial SDT1-028K sensor. Employing first-principles calculations, we show that doping of Cu in aluminum zinc oxide (AZO) facilitates the transfer of piezoelectrically excited charges and enhances the electron-transferring capacity of the Cu-AZO/PVDF hybrid structure, leading to stronger polarization effect and enhanced piezoelectric properties. A machine learning coupled multi-sensor network is engaged with inputting piezoelectric signals from insoles and knees, exhibiting excellent overall classification rate of 95.54% for six human motions.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"210 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144097274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0