Nanoscale最新文献

{"title":"Lead-free Halide Double Perovskites Nanoflakes as High-Performance SERS Substrates for Detection of Trace Organic Pollutants: Chemical Enhancement versus Electromagnetic Enhancement","authors":"Ravinder Chahal, Sirsendu Ghosal, Joydip Ghosh, P. K. Giri","doi":"10.1039/d5nr00437c","DOIUrl":"https://doi.org/10.1039/d5nr00437c","url":null,"abstract":"Surface-enhanced Raman scattering (SERS) is a powerful spectroscopic method known for its ultrasensitive characterization capabilities. Recently, Lead-based halide perovskites incorporated with noble metals have gained much attention as a SERS substrate. However, its practical applications are often hindered by the toxicity of the lead content and low stability. Herein, for the first time, we have synthesized Lead-free halide double perovskite (DP) Cs2AgBiBr6 to overcome the toxicity, stability, and uniformity and studied the performance of lead-based perovskites SERS substrates. The self-trapped exciton (STEs) defects were controlled by post-growth annealing of the sample in an Argon (Ar) atmosphere, minimizing the AgBi and BiAg anti-site disorder. The sample with the highest STE defects demonstrates the highest SERS performance owing to the defect-assisted charge transfer process. We successfully identified methylene blue (MB) and rhodamine 6G (R6G) at concentrations as low as ~10-10 M, achieving remarkable SERS enhancement factor (EF) of 5.04×107 and 1.37×107, respectively, which is highly significant for a semiconductor-based SERS substrate. Additionally, notable amplification was observed for other cationic dyes, including Crystal Violate (CV), Rhodamine B (RhB), Malachite Green (MG). By varying the annealing temperature and the deconvolution of the photoluminescence spectra, we demonstrate a direct correlation between the defect density and the SERS signal intensity. To further understand the underlying enhancement mechanisms, we analyzed the individual contributions of chemical and electromagnetic enhancements to the overall SERS amplification. This analysis was conducted using finite element method (FEM) simulations and density functional theory (DFT) computations. These insights provide a foundational basis for designing highly efficient, metal-free SERS substrates, opening new possibilities for advanced detection technologies. Additionally, the Cs2AgBiBr6 substrate exhibited excellent stability, retaining performance after four months of storage in ambient conditions, highlighting its potential for environmental monitoring.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"15 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Coordination Inheritance of Single Co Atom Catalysts for Two-Electron Oxygen Reduction Reaction","authors":"Qianqian Qin, Mengxue Huang, Chaoqi Han, Xue Jing, Wenwen Shi, Ruimin Ding, Xi Yin","doi":"10.1039/d5nr00337g","DOIUrl":"https://doi.org/10.1039/d5nr00337g","url":null,"abstract":"Electrosynthesis of hydrogen peroxide (H2O2) through the two-electron oxygen reduction reaction (2e-ORR) is environmentally friendly and sustainable. Transition-metal single-atom catalysts (SACs) have gained attention for this application due to their low cost, high atom utilization, adjustable coordination, and geometric isolation of active metal sites. Although various synthetic methods of SACs have been reported, the specific mechanism of the formation of active sites is still less studied. Herein, we presented the molecular coordination inheritance strategy for synthesizing 2e-ORR SACs with well-defined coordination environments and investigated the formation mechanism of the active sites. We select precursors including [Co(II)Salen], CoPc, Co(acac)2 to achieve specific configurations (Co-N2O2, Co-N4, Co-O4). Our results indicate that the precursors undergo decomposition and are partially embedded in the carbon substrate at lower temperatures, facilitating the inheritance of the desired configurations. As the temperature increases, the inherited configurations will rearrange, forming dual-atom structures and metal particles gradually. Among the Co-N2O2, Co-N4, and Co-O4 catalysts, the Co-N2O2 catalyst demonstrates the highest 2e-ORR selectivity. This work reveals the mechanism of regulating SAC's active site structure by the molecular coordination inheritance strategy, which may provide new insights for further research on the precise regulation and formation mechanism of SAC's active site.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"2 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluffy mesoporous Al2O3 supported Ag–In2O3 schottky junction catalysts for selective hydrogenation of CO of α,β-unsaturated aldehydes","authors":"Jiasheng Wang, Tianyu Zhang, Jiliang Song, Fengxin Zhang, Hong Liu, Wan-Hui Wang, Ming Bao","doi":"10.1039/d4nr05518g","DOIUrl":"https://doi.org/10.1039/d4nr05518g","url":null,"abstract":"Unsaturated alcohols (UOLs) are important fine chemical intermediates. Thus, it is of great significance to design and prepare catalysts for highly selective hydrogenation of C<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\"/>O of α,β-unsaturated aldehydes (UALs). In this paper, a fluffy mesoporous Al<small>₂</small>O<small>₃</small>-supported Ag–In<small>₂</small>O<small>₃</small> catalyst (Ag-In<small>₂</small>O<small>₃</small>/<em>f-m</em>-Al<small>₂</small>O<small>₃</small>) was synthesized by employing a two-solvent method, in which Ag and In<small>₂</small>O<small>₃</small> form a Mott–Schottky junction and lead to electron transfer from In<small>₂</small>O<small>₃</small> to Ag. Electron-rich Ag repels the C<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\"/>C bond owing to “four-electron repulsion”, and electron-deficient In<small>₂</small>O<small>₃</small> acts as the electrophilic site to adsorb the O atom of the C<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\"/>O bond, thus improving the selectivity towards UOLs. In addition to a larger specific surface area and smaller mass transfer resistance, the fluffy mesopore Al<small>₂</small>O<small>₃</small> exhibits a large number of Lewis acid sites, which can further improve UOL selectivity. With the help of Ag–In<small>₂</small>O<small>₃</small>/<em>f-m</em>-Al<small>₂</small>O<small>₃</small>, high UOL selectivity can be obtained from UALs containing aliphatic, aromatic and heterocyclic groups. This elaborate design of the catalyst could contribute to the highly selective hydrogenation of UALs to UOLs.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"8 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unexpected green-light emission and correlating room-temperature diluted magnetism in pristine non-magnetic closed-shell 4d0 yttria nanowires","authors":"Jianmin Li, Yun-Bing Hu","doi":"10.1039/d5nr00231a","DOIUrl":"https://doi.org/10.1039/d5nr00231a","url":null,"abstract":"We report the fabrication of pristine yttria (Y2O3) polycrystalline nanowires (NWs) by electrospinning method. An intense green photoluminescence (GPL) emission at 544 nm was observed from the Y2O3 nanograins with a statistical average crystallite size of 14.3 nm. Interestingly, the full-shell d electrons Y2O3 NWs are found weakly antiferromagnetic, and the effective magnetic moment was estimated as  1.62 10-4 B/per O at 10 K. The volume fraction of oxygen anion vacancies [VO]+ was estimated to be  1.62 % in the anion-defective electrospun Y2O3 NWs. A symmetric electron paramagnetic resonance signal at g  2.0415 revealed the presence of an unpaired electron trapped in the Y2O3 NWs. Finally, a [VO]+ electron-trapped state, i.e. F-center mechanism is proposed to explain the PL and correlating weak magnetism, which provides new insight into the origin of 4d0 diluted magnetism in nonmagnetic closed-shell Y2O3 NWs (spin from Y2O3) with GPL.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"67 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ZrN nucleation layer provides backside ohmic contact to MBE-grown GaN nanowires.","authors":"Stanislav Tiagulskyi, Roman Yatskiv, Marta Sobanska, Karol Olszewski, Zbigniew R Zytkiewicz, Jan Grym","doi":"10.1039/d5nr00321k","DOIUrl":"https://doi.org/10.1039/d5nr00321k","url":null,"abstract":"<p><p>Self-assembled GaN nanowires are typically grown on Si substrates with convenient nucleation layers. Light-emitting devices based on arrays of GaN nanowires require that the nucleation layer is electrically conductive and optically nontransparent to prevent the absorption of generated light in the Si substrate. This study reports the molecular beam epitaxial growth of GaN nanowires on ZrN nucleation layers sputtered on sapphire and demonstrates that ZrN provides ohmic contact to dense vertical arrays of n-type GaN nanowires. The ohmic nature of the ZrN/n-type GaN nanowire contact is evidenced by the measurement of the current-voltage characteristics of individual as-grown nanowires using nanomanipulators in a scanning electron microscope. The limitations and advantages of single-nanowire measurements are discussed, and approaches to overcome these limitations are proposed. The feasibility of this concept is demonstrated by the measurement of single nanowires with a p-n junction, exhibiting highly rectifying characteristics.</p>","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":" ","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143555316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamics and Kinetics in van der Waals Epitaxial Growth of Te","authors":"Taotao Li, Wenjin Gao, Yongsong Wang, Tianzhao Li, Guoxiang Zhi, Miao Zhou, Tianchao Niu","doi":"10.1039/d4nr05266h","DOIUrl":"https://doi.org/10.1039/d4nr05266h","url":null,"abstract":"Chemical vapour deposition (CVD) in tube furnace and molecular beam epitaxy (MBE) in vacuum chamber represent the most effective methods for the production of low-dimensional nanomaterials. However, the as-synthesized products always exhibit diverse morphologies and phases due to the varying thermodynamic and kinetic factors. A comprehensive investigation into these factors is thus imperative. Here, we employ tellurium (Te), a p-type semiconductor characterized by anisotropic properties, as a model system for van der Waals (vdW) epitaxy to elucidate the difference of kinetic and thermodynamic influences in CVD and MBE processes. From a thermodynamic perspective, the inherent structural anisotropy of Te crystal favors the growth of 1D nanowires. In CVD process, Te predominantly forms 1D structures at low substrate temperature (Tsub&lt;473 K) due to substantial thermal mass and high deposition rate. At higher Tsub (&gt;633K), diffusion takes over the dominance, resulting in the formation of kinetically controlled 2D Te nanoflakes. In MBE, the formation of 1D Te nanowires is impeded by kinetic limitations stemming from a limited deposition flux, yielding 2D Te films at low Tsub (120-300 K). Only at higher Tsub (400 K), when the MBE system reaches to a thermodynamic equilibrium, can 1D nanowires be synthesized. Our study reveals the distinct roles of thermodynamic and kinetic parameters in guiding the morphological evolution of Te nanostructures, and the findings provide a general framework for understanding the growth mechanism of other vdW epitaxial low-dimensional nanomaterials.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"16 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical Determinants of Nanoparticle-mediated Lipid Membrane Fusion","authors":"Beatrice Leonardini, Davide Bochicchio, Paolo Volpe, Francesco Stellacci, Silvia Dante, Ester Canepa, Giulia Rossi, ANNALISA RELINI","doi":"10.1039/d4nr04851b","DOIUrl":"https://doi.org/10.1039/d4nr04851b","url":null,"abstract":"A wide range of fundamental cellular activities rely on lipid membrane fusion. Membrane fusion processes can be mimicked by synthetic approaches to understand fusion mechanisms and develop novel drug delivery systems and therapeutic agents. Recently, membrane-embedded amphiphilic gold nanoparticles (AuNPs) have been employed as artificial fusogens to induce finely tuned membrane fusion in vitro. However, the physical determinants driving and regulating the fusion process mediated by AuNPs remain largely unexplored, thus limiting the application potential of this synthetic fusion system. Herein, we focus on unraveling the effect of the interplay between the curvature of the lipid membrane and the size of amphiphilic AuNPs during fusion events. We employed AuNPs with the same surface chemistry but different core diameters (~2 nm and ~4 nm) interacting with phosphatidylcholine unilamellar vesicles of different membrane curvatures containing a biologically relevant percentage of cholesterol. Based on a combination of fluorescence spectroscopy assays, dissipative quartz microbalance, and molecular dynamics simulations, our findings reveal that small AuNPs promote vesicle fusion regardless of the membrane curvature. In contrast, large AuNPs do not exhibit fusogenic properties with low curvature membranes, and can induce fusion events only with significantly curved membranes. Large NPs impede the progression from the stalk state to the hemifused state via steric hindrance, an effect that is only partially compensated by membrane curvature. These results offer novel insights into the role of AuNP core size and membrane curvature in mediating the interaction between the vesicles during fusion and highlight how understanding these physical determinants has broad implications in fully exploiting the application potential of novel synthetic fusion approaches.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"131 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogen Bubble Evolution and Its Induced Mass Transfer on Zinc Electrodes in Alkaline and Neutral Media","authors":"Yi He, Yongfu Liu, Wenxu Shang, Peng Tan","doi":"10.1039/d4nr05108d","DOIUrl":"https://doi.org/10.1039/d4nr05108d","url":null,"abstract":"The evolution of hydrogen bubbles plays a critical role in governing the performance of Zn-based batteries by influencing Zn deposition, electrode morphology, and mass transfer dynamics. This work consolidates recent progress in understanding the dual influence of hydrogen bubble evolution on Zn-based batteries, emphasizing its implications for mass transfer and electrochemical performance. While presenting challenges such as inhomogeneous Zn deposition, dendrite formation, and Zn passivation, hydrogen bubble evolution simultaneously facilitates mass transfer by its forced convective disturbance. Advanced experimental techniques, including electrochemical mass spectrometry, X-ray microscopy, and gas chromatography, are employed to investigate the complex interplay between the hydrogen evolution reaction (HER) and Zn deposition. The hydrogen bubbles induced by HER not only promote local convection to enhance the transport of zincate or Zn-ions but also serve as templates for forming porous Zn structures to increase the electrochemically active surface area and accelerate reaction kinetics. Finally, emerging strategies are outlooked to mitigate the detrimental effects of HER, while capitalizing on its beneficial properties to optimize Zn electrode performance, with the ultimate goal of improving the efficiency, safety, and longevity of rechargeable Zn-based energy storage devices.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"44 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Born-Kuhn’s coupled oscillator model for optical activity in ordered media","authors":"Razvigor Ossikovski, Oriol Arteaga","doi":"10.1039/d4nr04378b","DOIUrl":"https://doi.org/10.1039/d4nr04378b","url":null,"abstract":"Starting from the phenomenological electromagnetic description of optical activity we establish a formal framework in which the gyration and permittivity tensors of any ordered medium (a molecule or a crystal) can be derived using the classic Born-Kuhn’s coupled oscillator model. The model allows for an efficient parameterisation of both tensors in terms of the configurational and structural parameters (orientations, positions and coupling strengths) of a system of coupled oscillators having the same symmetries as the medium of interest. As an illustration, Born-Kuhn’s molecular models of all optically active crystal classes are established.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"36 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-threshold Colloidal Quantum Dots Polariton Lasing via a Strong Coupling Microcavity at Room Temperature","authors":"Junxing Dong, Yuting Wang, Runchen Wang, Lisheng Wang, Jingzhuo Wang, Yifan Zhang, Yue Wang, Xianghu Wang, Si Shen, Hai Zhu","doi":"10.1039/d4nr05185h","DOIUrl":"https://doi.org/10.1039/d4nr05185h","url":null,"abstract":"Colloidal quantum dots (CQDs) are excellent optical gain media that can be synthesized through low-cost and easily controlled techniques, holding significant promise for applications in semiconductor laser devices. In this paper, we firstly demonstrated polariton coherent lasing based on a CdSe-based CQDs microcavity device at room-temperature (RT). The dispersion behaviors of CQDs polariton with different excitation power were analyzed comprehensively using angle-resolved spectroscopy techniques. The lasing behavior at threshold of 49μJ/cm2 and energy blue-shift are well fitting with the typical characteristics of robust polariton Bose-Einstein condensation (BEC) theory. Moreover, the linewidth of polariton lasing peak is narrowed down to 0.65 nm at 1.13Pth. Additionally, the polarization characteristics and temporal dynamics of the CQDs-microcavity polariton lasing are discussed. It is noted that the lifetime of CQDs polariton during condensation was reduced from 1.3 ns (0.8 Pth) to 68 ps (1.6 Pth). Our results provide valuable insights into the strong coupling low-threshold CQDs microcavity laser at RT, and promote its practical application in further.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"33 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}