Nanotechnology最新文献

{"title":"Solution processed Ti₃C₂MXene nanosheets as resistive switching layers in flexible RRAM devices for sustainable electronics.","authors":"Shalu Saini, Shree Prakash Tiwari","doi":"10.1088/1361-6528/ae029c","DOIUrl":"10.1088/1361-6528/ae029c","url":null,"abstract":"<p><p>Due to their exceptional chemical stability and tunable chemical properties particularly the interlayer bonding, MXenes have emerged as promising switching layers in RRAM devices. This work presents the synthesis of nanosheets of a widely explored MXene (Ti₃C₂), and its application for demonstrating high performance flexible RRAM devices through solution processing, which is rarely demonstrated till date. The structural and morphological properties of Ti₃C₂nanosheets were comprehensively investigated using various characterization techniques. RRAM devices were fabricated on ITO coated PET substrate with both Ag and Al as top electrodes. The Ag/Ti₃C₂/ITO RRAM devices showed excellent retention time of 10⁴s with<i>I</i>_ON/<i>I</i>_OFFof ∼10³and low average<i>V</i>_SET&<i>V</i>_RESETvoltages of ∼0.8 V &- 0.7 V suitable for low voltage operation. On the other hand Al/Ti₃C₂/ITO RRAM devices exhibited similar excellent retention time of 10⁴s and reliable switching characteristics with higher<i>I</i>_ON/<i>I</i>_OFFof ∼10⁴, yet a high<i>V</i>_SETof 3.5 V and low<i>V</i>_RESETof -0.85 V. These devices were further investigated for stability of electrical performance upon bending at various radii of 12 mm, 7 mm, and 5 mm, indicating consistent switching. Among the two, the Al/Ti₃C₂/ITO device exhibited superior mechanical flexibility, maintaining a higher<i>I</i>_ON/<i>I</i>_OFF(∼10⁴-10⁵) and stable retention of both LRS and HRS under bending radii down to 5 mm, whereas the Ag/Ti₃C₂/ITO device showed a noticeable decline in HRS stability and<i>I</i>_ON/<i>I</i>_OFF(from ∼10³to ∼10¹), indicating the Al-based device is more feasible for flexible memory applications. These findings confirm that solution-processed Ti₃C₂can be a promising switching layer for flexible and sustainable electronics.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144992908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling composition-properties relationships inMo1-xWxSe2alloys: a theoretical and experimental study.","authors":"Ana Carolina Ferreira de Brito, Alysson Alves Pinto, Jan Plutnar, Zdenek Sofer, Gabriel Ravanhani Schleder, Rodrigo B Capaz, Ingrid David Barcelos, Bernardo Ruegger Almeida Neves","doi":"10.1088/1361-6528/ae00cd","DOIUrl":"10.1088/1361-6528/ae00cd","url":null,"abstract":"<p><p>Two-dimensional transition metal dichalcogenide alloys have emerged as a versatile platform for electronic, optoelectronic, and quantum applications due to their tunable crystal structure and unique electronic properties. In this study, we investigate the influence of atomic composition on the structural, electronic, and optical properties of theMo1-xWxSe2alloy, combining experimental and theoretical approaches. Samples with different Mo and W ratios were synthesized and characterized using Raman and photoluminescence spectroscopies, and atomic force microscopy. Local anodic oxidation was employed to manipulate monolayers within the alloy flakes, revealing significant luminescence enhancement in the engineered islands, suggesting structural and electronic modifications. Additionally, density functional theory calculations indicated that oxidation stability strongly depends on atomic composition, with theMo0.5W0.5Se2andMo0.75W0.25Se2alloys exhibiting the highest resistance to vacancy formation. These findings highlight the potential for structural and electronic engineering ofMo1-xWxSe2alloys, paving the way for advanced applications in nanotechnology and quantum computing.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144961866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ZnO/Ag nanostructures for surface-enhanced Raman spectroscopy: effect of wedge microcavity.","authors":"Olesya O Kapitanova, Anastasiya V Kornilova, Nikita D Mitiushev, Irina A Veselova, Viktor Yu Timoshenko, Andrei N Baranov","doi":"10.1088/1361-6528/ae01ab","DOIUrl":"10.1088/1361-6528/ae01ab","url":null,"abstract":"<p><p>Zinc oxide (ZnO) nanostructures with deposited silver (Ag) nanoparticles (NPs) exhibit exceptional opportunities for highly sensitive molecular diagnostics by means of the surface-enhanced Raman spectroscopy(SERS). Here we use the well known method of the hydrothermal synthesis of arrays of ZnO nanorods (NRs), followed with deposition of Ag-NPs by facile photochemical reduction under UV-light illumination to obtain ZnO-NRs/Ag-NPs hybrid structures with superior SERS activity. SERS spectra of a probe analyte, i.e. Rhodamine R6G molecules absorbed in an optimized ZnO-NRs/Ag-NPs structures, are detected in a wide range of the analyte concentration from 10^-6to 10^-14M. Numerical simulations of the light scattering in ZnO-NRs/Ag-NPs structures allow us to show that the wedge-like morphology of ZnO-NRs plays a crucial role in the 3D electromagnetic enhancement of the SERS signal, which can be as high as 3•10⁸for the lowest analyte concentration. The revealed high SERS activity of the obtained ZnO/Ag hybrid nanostructures together with the simplicity of their preparation open new prospects for their application in analytical chemistry, sensorics and photonics.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144961879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compact modeling of 2D nanotransistors: materials characteristics, device structures, and analytical techniques.","authors":"Adelcio M de Souza, Daniel R Celino, Regiane Ragi, Murilo A Romero","doi":"10.1088/1361-6528/ae00ce","DOIUrl":"10.1088/1361-6528/ae00ce","url":null,"abstract":"<p><p>This review addresses the compact modeling strategies for field-effect transistors (FETs) based on two-dimensional materials (2D-FETs), which offer excellent electrostatic control and strong scaling potential thanks to their atomically thin channels. Achieving the integration of 2D-FETs into high-density circuits demands accurate compact models, beyond those established for silicon MOSFETs. We discuss the characteristics of the main 2D material suitable for nanoelectronics and examine the main modeling approaches and challenges, with a focus on top-gated devices and transport regimes spanning from diffusive to ballistic. Special attention is given to non-idealities such as short-channel effects, interface traps, and non-ohmic heterodimensional (3D-2D) contacts. Finally, we offer perspectives on the future application of 2D semiconductors in nanoelectronics.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144962234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Top-down reorganization of self-assembled monolayers on Au(111).","authors":"Steven Kolaczkowski, Gregory S Girolami, Joseph W Lyding","doi":"10.1088/1361-6528/ae0044","DOIUrl":"10.1088/1361-6528/ae0044","url":null,"abstract":"<p><p>Bottom-up synthesis of graphene nanoribbons (GNRs) from aryl halide precursors is often performed thermally or in-solution, without detailing the local molecular assembly or the precursor's response to electromechanics perturbation. This synthetic approach forms nanoribbons with well-defined widths and atomically precise edges, which are necessary for ensuring bandgap uniformity. However, neither on-surface nor solution-based GNR synthesis techniques adequately address the problem of positional control, which is crucial to the fabrication of GNR transistors. To better understand this issue, we investigate the on-surface ordering of 10, 10'-dibromo-9, 9'-bianthracene (DBBA), the 7A-GNR monomer precursor. Scanning tunneling microscopy imaging shows that DBBA molecules spontaneously assemble on Au(111) into non-covalent two-dimensional islands. By varying sample temperature during and after deposition, we observe three different adsorbate arrangements. These two-dimensional packing structures demonstrate differing responses to localized excitations. The difference in packing structures and their respective responses to electro-mechanical perturbations can give us insight into how to best optimize conditions for locally controlled and large-scale thermal GNR polymer growth.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144961891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Progress on solid-state synthesis and photoluminescence applications of all-inorganic metal halide perovskite nanocrystals.","authors":"Dehua Fan, Baolong Jing, Jin Han","doi":"10.1088/1361-6528/adfd64","DOIUrl":"10.1088/1361-6528/adfd64","url":null,"abstract":"<p><p>In recent years, all-inorganic metal halide perovskite nanocrystals (NCs) have emerged as promising optoelectronic materials due to their exceptional optical properties, including high photoluminescence (PL) quantum yields (PLQYs > 90%), extremely narrow full width at half maximum (FWHM < 30 nm), broadly tunable emission spectra, and short decay lifetimes. However, extensive reviews exist on colloidal perovskite NCs synthesized via solution-related methods. Here, this review uniquely focuses on solid-state synthesis of bulk and powder NCs. And a comprehensive overview of the latest advancements in solid-state synthesis techniques is provided, including high-energy ball milling, high-temperature solid-state synthesis (molten salt synthesis and template-confined synthesis), and glass matrix encapsulation. Furthermore, the PL applications of all-inorganic metal halide perovskite NCs in white light-emitting diodes (LEDs), micro LEDs (<i>μ</i>-LEDs), liquid crystal display (LCD) backlight, anti-counterfeiting, and x-ray are discussed in detail, emphasizing their superior performance in terms of color purity, brightness, and stability. Ultimately, the current challenges, including defect regulation, stability of iodine-based materials, and in-depth understanding of template growth mechanisms are still bottlenecks hindering further research. This review may assist researchers in developing the solid-state synthesis of all-inorganic metal halide perovskite NCs and applying this synthesis method to next-generation optoelectronic devices.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144961859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Copper foils as substrates for growing nitrogen-doped carbon nanotubes.","authors":"Brenda Verónica Padilla-Teniente, Juan L Fajardo-Díaz, Luis A Macclesh Del Pino Pérez, Florentino López Urías, Emilio Muñoz-Sandoval","doi":"10.1088/1361-6528/ae0042","DOIUrl":"10.1088/1361-6528/ae0042","url":null,"abstract":"<p><p>Hybrid Fe- and Cu-based nanoparticles (NPs) embedded in a variety of graphitic carbon matrices were produced using an aerosol-assisted chemical vapor deposition method. A thin copper foil was used as the substrate, and ferrocene and benzylamine were pyrolyzed at temperatures ranging from 750 °C to 950 °C. Three types of hybrid materials were obtained: (1) Fe₃C and Cu NPs encapsulated in graphitic carbon at 750 °C, (2) nitrogen-doped multiwalled carbon nanotubes with a high density of NPs attached to their surface at 800 °C, and (3) a large tubular-defective fiber-type material surrounded by NPs above 850 °C. Backscattering scanning electron microscopy and energy dispersive spectroscopy revealed the composition, morphology, and size of the NPs obtained in each case. Raman spectroscopy characterizations revealed the typical G-band and D-band with<i>I</i>_D/<i>I</i>_Gvalues ranging from 0.79 to 0.88, which are related to the formation of topological defects and highly defective tubule-like graphitic structures. We also correlated the shift of the G-band to lower values with the type of structure obtained by increasing synthesis temperature. The interlayer graphitic distance and Fe₃C- and Cu-NP crystal planes were examined using transmission electron microscopy. Finally, we proposed a formation mechanism for the different hybrid materials involved in the synthesis. Electrochemical impedance spectroscopy results are discussed. Our samples, with their unique properties, can be used as molecular sensors or electrodes in energy storage devices, opening up exciting possibilities for future applications.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144962245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<i>Ab initio</i>study of flexoelectricity in MXene monolayers.","authors":"Shashikant Kumar, Zixi Zhang, Phanish Suryanarayana","doi":"10.1088/1361-6528/ae0045","DOIUrl":"10.1088/1361-6528/ae0045","url":null,"abstract":"<p><p>We investigate flexoelectricity in MXene monolayers from first principles. Specifically, we compute the transverse flexoelectric coefficients of 126 MXene monolayers along their two principal directions using Kohn-Sham density functional theory. The values span a wide range from 0.19 <i>e</i>to 1.3 <i>e</i>and are nearly isotropic with respect to bending direction. The transition metal is found to play a significant role in the flexoelectric response, with nitride-based MXenes consistently displaying larger coefficients than their carbide counterparts. Moreover, the coefficients increase with structural thickness, but when normalized by the bending modulus, which is also computed for all 126 monolayers, they exhibit the opposite trend.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144962247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy-band engineering and deep-ultraviolet photodetection of Ga₂O₃alloys: a concise review.","authors":"Zeng Liu, Zhaoying Xi, Linhai Gu, Sihan Yan, Rui Zhang, Xu Zhang, Hongbo Wang, Jia-Han Zhang, Weihua Tang","doi":"10.1088/1361-6528/ae0043","DOIUrl":"10.1088/1361-6528/ae0043","url":null,"abstract":"<p><p>Gallium oxide (Ga₂O₃)-based solar-blind ultraviolet photodetectors gained much attention for their promising prospects in new-generation solid-state optoelectronics and electronics. Catering for the demands of broadband photodetection, tunable energy-band, adjusted carrier concentration and effective carrier transition, alloying engineering through doping is gradually launched as one of the research emphases. This review is proposed to understand the photodetection performances in view of energy-band engineering. Especially for the representative (In<i>_x</i>Ga_1-<i>x</i>)₂O₃and (Al<i>_y</i>Ga_1-<i>y</i>)₂O₃alloys, the conduction band edges upshift as the empty Al 3 s and In 5 s states are introduced with higher energy, hybridize with Ga 4 s state. This leads to a result that low effective electron mass and high electron mobility could be achieved, contributing to high quality tunable performances of solar-blind UV photodetection. Thus, in this concise review article, the alloyed Ga₂O₃for photodetection would be reviewed and discussed based on the current developments, from the viewpoint of energy-band theory.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144961684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scalable laser fabrication of disordered dual-purpose silver nanostructures towards secure plasmonic devices.","authors":"Dimitrios Ntemogiannis, Vagelis Karoutsos, Panagiotis Poulopoulos, Dimitris Alexandropoulos","doi":"10.1088/1361-6528/adf563","DOIUrl":"10.1088/1361-6528/adf563","url":null,"abstract":"<p><p>Plasmonic nanoparticles (NPs) are widely utilized in various applications including sensing and imaging due to their strong localized surface plasmon resonances (LSPRs). Recently, plasmonic NP assemblies and configurations have also been explored as physical unclonable functions (PUFs) for security applications, however, many existing PUF designs face challenges such as complex fabrication processes and high costs, which complicate their implementation. This study introduces a scalable and practical approach to fabricate disordered self-assembled silver NPs for use as dual-purpose features in plasmonic devices. These nanostructures could offer multifunctionality by simultaneously serving as a functional plasmonic feature and as a potential PUF, providing an extra security layer in the device configuration. The proposed nanostructuring method could support the large-scale production of plasmonic nanostructures with desirable LSPR characteristics, essential for diverse plasmonic applications, while their structural uniqueness enables their potential exploitation as unclonable PUF fingerprints. In this work, disordered silver NPs were grown via laser annealing of silver ultrathin films with thicknesses ranging from 12.5 to 15 nm. Ultraviolet-visible spectroscopy and atomic force microscopy revealed high-intensity LSPRs and unique nanopatterns, demonstrating their potential multifunctionality.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}