{"title":"Andreev Reflection in the Quantum Hall Regime at an Al/InAs Junction on a Cleaved Edge","authors":"Takafumi Akiho, Hiroshi Irie, Yusuke Nakazawa, Satoshi Sasaki, Norio Kumada, Koji Muraki","doi":"10.1021/acs.nanolett.4c04223","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04223","url":null,"abstract":"We have fabricated a superconductor/semiconductor junction composed of Al and InAs using cleaved edge overgrowth. By exploiting the unique geometry with a thin Al/Pt/Al trilayer formed on the side surface of an in situ cleaved InAs quantum well heterostructure wafer, we achieve a superconducting critical field of ∼5 T, allowing superconductivity and quantum Hall (QH) effects to coexist down to filling factor ν = 3. Andreev reflection at zero magnetic field shows a conductance enhancement limited solely by the Fermi velocity mismatch, demonstrating a virtually barrier-free junction. Bias spectroscopy in the QH regime reveals the opening of a superconducting gap, with the reduced downstream resistance indicating electron–hole Andreev conversion. Our results, obtained in a new experimental regime characterized by a clean edge-contacted junction with a superconducting electrode narrower than the coherence length, open new avenues for both theoretical and experimental studies of the interplay between superconductivity and QH effects.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142589211","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}
Nano LettersPub Date : 2024-11-06DOI: 10.1021/acs.nanolett.4c04114
Bisweswar Patra, Jameel Damoah, Terefe G Habteyes
{"title":"Picometer Scale Photothermal Tuning of Plasmonic Nanocavities and Interfacial Processes.","authors":"Bisweswar Patra, Jameel Damoah, Terefe G Habteyes","doi":"10.1021/acs.nanolett.4c04114","DOIUrl":"10.1021/acs.nanolett.4c04114","url":null,"abstract":"<p><p>The ability to precisely tune plasmon resonances is critical for advancing nanophotonic and sensing technologies. In this work, we exploit the photothermal effect to achieve picometer-level tunability of plasmon resonances in nanorod-on-mirror nanocavities, using polyelectrolyte (PE) layers as dielectric spacers. The plasmon-induced thermal response of these soft materials allows real-time adjustment of the nanocavity, unlike stable inorganic spacers like aluminum oxide. Under continuous laser illumination, the PE spacers undergo thickness reduction and phase transitions, leading to significant shifts in plasmon resonances. These shifts are influenced by laser power and initial spacer thickness, which govern near-field enhancement and photothermal effects. It is shown that this precise tuning capability enables the exploration of various photophysical processes, including the excitation of higher-order plasmon modes, optomechanical enhancement of surface-enhanced Raman scattering signals, electron tunneling, molecular diffusion from the nanocavities, and the transition to charge transfer plasmons.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":9.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142589551","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}
{"title":"Spectrally Tunable Ultrafast Long Wave Infrared Detection at Room Temperature.","authors":"Tianyi Guo, Sayan Chandra, Arindam Dasgupta, Muhammad Waqas Shabbir, Aritra Biswas, Debashis Chanda","doi":"10.1021/acs.nanolett.4c03832","DOIUrl":"10.1021/acs.nanolett.4c03832","url":null,"abstract":"<p><p>Room-temperature longwave infrared (LWIR) detectors are preferred over cryogenically cooled solutions due to the cost effectiveness and ease of operation. The performance of present uncooled LWIR detectors such as microbolometers, is limited by reduced sensitivity, slow response time, and the lack of dynamic spectral tunability. Here, we present a graphene-based efficient room-temperature LWIR detector with high detectivity and fast response time utilizing its tunable optical and electronic characteristics. The inherent weak light absorption is enhanced by Dirac plasmons on the patterned graphene coupled to an optical cavity. The absorbed energy is converted into photovoltage by the Seebeck effect with an asymmetric carrier generation environment. Further, dynamic spectral tunability in the 8-12 μm LWIR band is achieved by electrostatic gating. The proposed detection platform paves the path to a fresh generation of uncooled graphene-based LWIR photodetectors for wide ranging applications such as molecular sensing, medical diagnostics, military, security and space.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":9.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580883","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}
Nano LettersPub Date : 2024-11-06DOI: 10.1021/acs.nanolett.4c03898
Jiyuan Yu, Zifei Chen, Heyou Zhang, James A Hutchison, Paul Mulvaney, Arun Ashokan
{"title":"Surface Plasmon Modulation in Cu<sub>3-<i>x</i></sub>P Nanocrystals.","authors":"Jiyuan Yu, Zifei Chen, Heyou Zhang, James A Hutchison, Paul Mulvaney, Arun Ashokan","doi":"10.1021/acs.nanolett.4c03898","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c03898","url":null,"abstract":"<p><p>We demonstrate modulation of the surface plasmon resonance in nonstoichiometric copper phosphide nanocrystals using spectroelectrochemical methods. Application of an anodic potential resulted in a blue-shift of the surface plasmon resonance and an incremental increase in its extinction coefficient. Conversely, upon application of a cathodic potential, the surface plasmon band red-shifted and reduced in intensity. These changes were found to be reversible over multiple cycles of anodic and cathodic potential steps. We also discuss how the postsynthetic ligand treatment impacts the surface plasmon peak and the structure of Cu<sub>3-<i>x</i></sub>P nanocrystals. For example, the addition of alkylthiols resulted in the chemical decomposition of the nanocrystals. This work demonstrates how the surface plasmon peak in Cu<sub>3-<i>x</i></sub>P can be used to probe changes in the structure and carrier density in these nanocrystals.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":9.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580902","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}
Nano LettersPub Date : 2024-11-06DOI: 10.1021/acs.nanolett.4c02514
Zhenjiang Cao, Zhiguo Du, Kai Jia, Li Jin, Na Li, Miao Zhang, Rui Gao, Amr Abdelkader, R Vasant Kumar, Shujiang Ding, Kai Xi, Shubin Yang
{"title":"Bubbling Chemical Vapors in Molten Metal toward XIV-Group Nanosheets.","authors":"Zhenjiang Cao, Zhiguo Du, Kai Jia, Li Jin, Na Li, Miao Zhang, Rui Gao, Amr Abdelkader, R Vasant Kumar, Shujiang Ding, Kai Xi, Shubin Yang","doi":"10.1021/acs.nanolett.4c02514","DOIUrl":"10.1021/acs.nanolett.4c02514","url":null,"abstract":"<p><p>Two-dimensional (2D) XIV-group nanosheets (germanene, silicene, and stannene) possess unique physical and chemical features promising in fields of electronics, energy storage, and conversions. However, preparing these nanosheets is challenging owing to their non van der Waals structure with strong chemical bonds inside. Herein, a bubbling chemical-vapor growth method is proposed to synthesize these XIV-group nanosheets by bubbling XIV-group-element chlorides in molten sodium. During the synthetic process, XIV-group materials are formed by the reaction of XIV-group element chlorides with strong reducing sodium, then nucleated, and finally isolated to 2D nanosheets in the gas-liquid interface. With the collapse of vapor bubbles and subsequent injection, 2D nanosheets are continuously produced. The nanosheets (Ge) possess a thickness of ∼3.8 nm and a lateral size of ∼2.0 μm. Combining with graphene, the hybrid and flexible films are obtained, delivering a volumetric specific capacity of 4785 mAh cm<sup>-3</sup> and superior cycling stability (over 4000 cycles) in lithium-ion batteries.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":9.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580876","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}
{"title":"Superconducting Boride Nb<sub>2</sub>IrB<sub>2</sub> with Variable and Tunable Stacking Behaviors of Two-Dimensional [Nb-Ir-Nb] Triangular Lattices.","authors":"Hanbin Gao, Yang Song, Ning Guo, Qing-Qiao Fu, Yue Gong, Feiyu Li, Fangli Li, Liusuo Wu, Junjie Zhang, Er-Jia Guo, Lizhi Zhang, Qiang Zheng","doi":"10.1021/acs.nanolett.4c04739","DOIUrl":"10.1021/acs.nanolett.4c04739","url":null,"abstract":"<p><p>In structures with special geometry lattices, variations in stacking sequences are ubiquitous, yielding many novel structures and functionalities. Despite a wealth of intriguing properties and wide-ranging applications, there remains a considerable gap in understanding the correlation between special geometry lattices and functionalities in borides. Here, we design and synthesize a new superconducting boride Nb<sub>2</sub>IrB<sub>2</sub>, with a body-centered orthorhombic structure, consisting of alternating two-dimensional [Nb-Ir-Nb] triple-triangular-lattice-layers and B fragment layers. Advanced aberration-corrected scanning transmission electron microscopy observations show variable stacking configurations between [Nb-Ir-Nb] triple-triangular-lattice layers that can be tuned through synthesis conditions. Density functional theory calculations reveal that the coherent low-energy boundary interface plane of {101} between [11̅1] and [010] domains is responsible for the variable stacking behaviors. Energetically favorable structures are thereby reasonably proposed, based on nanoscale imperfect structure units. These findings provide valuable insights for designing and exploring new structures and functionalities within boride systems involving special geometry lattices.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":9.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453470","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}
Nano LettersPub Date : 2024-11-05DOI: 10.1021/acs.nanolett.4c04422
Weimin Xie, Yiting Yuan, Xiaozheng Liang, Qianqian Liu, Juan Liao, Ying Chen, Huaming Yang
{"title":"Nanoclay Mediated Two-Pronged Strategy for Infected-Wound Healing","authors":"Weimin Xie, Yiting Yuan, Xiaozheng Liang, Qianqian Liu, Juan Liao, Ying Chen, Huaming Yang","doi":"10.1021/acs.nanolett.4c04422","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04422","url":null,"abstract":"Photothermal therapy (PTT) is an efficient way to combat bacterial infections and circumvent multidrug resistance. However, balancing efficacious bacterial killing and minimizing damage to the surrounding normal tissues remain a great challenge. Herein, a highly cooperative Prussian blue/kaolinite (PB/Kaol) hybrid nanosystem is constructed for antibacterial therapy to accelerate the healing of infected wounds. After hybridization with Kaol, the prepared PB/Kaol forms interfacial Al–O–Fe bonds, a fast charge transfer channel from Kaol to PB, which contributes to the enhanced photothermal effect of PB/Kaol. Additionally, the hydroxyl and Lewis acid–base sites of the Kaol surface could promote the adhesion of PB/Kaol to bacteria, thereby ensuring that as much hyperthermia as possible is focused on the bacteria and minimizing damage to the surrounding healthy tissues. Furthermore, PB/Kaol inherits the anti-inflammatory and hemostasis functions of PB and Kaol, resulting in the rapid healing of infected wounds.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580619","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}
Nano LettersPub Date : 2024-11-05DOI: 10.1021/acs.nanolett.4c0417510.1021/acs.nanolett.4c04175
Xu Dong, Yu Zheng, Hao Deng, Xiao Pang, Tao Wu, Shiyi Zhu, Runnan Zhang* and Zhongyi Jiang*,
{"title":"Bubble Drainage Assisted Fabrication of Polyamide Membranes with Crater-like Structures for Efficient Desalination","authors":"Xu Dong, Yu Zheng, Hao Deng, Xiao Pang, Tao Wu, Shiyi Zhu, Runnan Zhang* and Zhongyi Jiang*, ","doi":"10.1021/acs.nanolett.4c0417510.1021/acs.nanolett.4c04175","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04175https://doi.org/10.1021/acs.nanolett.4c04175","url":null,"abstract":"<p >Bubble drainage (BD) occurs in various natural phenomena and industrial activities, in which bubbles rise toward the water surface and create a progressively thinned two-sided liquid film, called a lamella. Surfactant, as an important regulator in the BD process, not only assembles on both sides of the lamellae, generating a configuration of lamellae sandwiched by monolayers of surfactants (lamellae/MS), but also induces interfacial deformation by lowering interfacial tension. Herein, we developed a strategy of BD assisted interfacial polymerization for the fabrication of polyamide (PA) membranes. The regulated interfacial deformation at the water–oil interface produced a membrane with crater-like structures, which greatly increased the surface area of the PA membrane. Moreover, the lamellae/MS configuration served as a reservoir to spontaneously enrich amine monomers and thus modulate the diffusion-reaction kinetics. The resulting PA membranes exhibited superior separation performance with a water permeance of 44.7 L m<sup>–2</sup> h<sup>–1</sup> bar<sup>–1</sup> and a Na<sub>2</sub>SO<sub>4</sub> rejection of 99.2%.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":9.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142608389","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}
Nano LettersPub Date : 2024-11-05DOI: 10.1021/acs.nanolett.4c04570
Di Gao, Siming Zhao, Ya Huang, Xueke Wu, Run Li, Yilin Ding, Qinyuan Jiang, Yanlong Zhao, Fei Wang, Rufan Zhang
{"title":"A Facile Electrochemical Strategy for Achieving a High-Conductivity Polypyrrole Derivative with Intrinsic Metallic Transport as a High-Performance Electrochromic Conducting Polymer Film","authors":"Di Gao, Siming Zhao, Ya Huang, Xueke Wu, Run Li, Yilin Ding, Qinyuan Jiang, Yanlong Zhao, Fei Wang, Rufan Zhang","doi":"10.1021/acs.nanolett.4c04570","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04570","url":null,"abstract":"Conjugated polymer electrochromic materials (PECMs) with tailored optical and electrical properties are applied in smart windows, electronic displays, and adaptive camouflage. The limitation in the electrical conductivity results in slow and monotonous color switching. We present a polypyrrole film incorporated with a toluene-<i>p</i>-sulfonic group (PPy-TSO-F), via a one-step electrodeposition technique. The PPy-TSO-F thin film (110 nm) achieves an impressive electrical conductivity of 1011 S cm<sup>–1</sup>, a high carrier mobility of 82 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup>, and intrinsic metallic electronic behavior. It demonstrates exceptionally reversible multicolor switching, transitioning from emerald green (−1.5 V), to bluish green (−1.4 V), bright yellow (−1.2 V), greenish yellow (−0.6 V), reddish brown (0.1 V), dark brown (0.3 V), and atrovirens (0.6 V). The fast charge transport and high carrier mobility render the film with an ultrafast electrochromic switching speed of 0.01 s/0.02 s. This research provides a new route to designing ultrafast multicolor switching PECMs with metallic charge transport.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580620","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}
{"title":"Bubble Drainage Assisted Fabrication of Polyamide Membranes with Crater-like Structures for Efficient Desalination","authors":"Xu Dong, Yu Zheng, Hao Deng, Xiao Pang, Tao Wu, Shiyi Zhu, Runnan Zhang, Zhongyi Jiang","doi":"10.1021/acs.nanolett.4c04175","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04175","url":null,"abstract":"Bubble drainage (BD) occurs in various natural phenomena and industrial activities, in which bubbles rise toward the water surface and create a progressively thinned two-sided liquid film, called a lamella. Surfactant, as an important regulator in the BD process, not only assembles on both sides of the lamellae, generating a configuration of lamellae sandwiched by monolayers of surfactants (lamellae/MS), but also induces interfacial deformation by lowering interfacial tension. Herein, we developed a strategy of BD assisted interfacial polymerization for the fabrication of polyamide (PA) membranes. The regulated interfacial deformation at the water–oil interface produced a membrane with crater-like structures, which greatly increased the surface area of the PA membrane. Moreover, the lamellae/MS configuration served as a reservoir to spontaneously enrich amine monomers and thus modulate the diffusion-reaction kinetics. The resulting PA membranes exhibited superior separation performance with a water permeance of 44.7 L m<sup>–2</sup> h<sup>–1</sup> bar<sup>–1</sup> and a Na<sub>2</sub>SO<sub>4</sub> rejection of 99.2%.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":null,"pages":null},"PeriodicalIF":10.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580627","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}