Nanotechnology最新文献

{"title":"Nitrogen-driven plasma modulation for tuning silicon-vacancy formation in diamond.","authors":"Rahul Raj, N Chandrasekaran, K G Pradeep, M S Ramachandra Rao","doi":"10.1088/1361-6528/adee9e","DOIUrl":"10.1088/1361-6528/adee9e","url":null,"abstract":"<p><p>Silicon-vacancy (SiV) centers in diamond are promising for quantum photonics due to their narrow zero-phonon line and excellent photonic properties. Here, we demonstrate controlled growth of delta-doped SiV layers in nanocrystalline diamond films by a single-step microwave plasma chemical vapor deposition growth process. By manipulating nitrogen flow during growth, we achieved a uniform layer of SiVs in diamond while maintaining consistent microstructural properties throughout the film. While a correlation between microstructural change and doping density is observed, optical emission spectroscopy analysis reveals that the mechanism between the two processes is different. Atom probe tomography confirms the uniform distribution of silicon atoms in the diamond matrix, even at concentrations as high as 3.6 × 10²¹ cm^-3. The approach shows promise for the precise tuning of the layer thickness and doping concentration, and offers a scalable approach for creating high-quality SiV layers in diamond, advancing their integration into nanophotonic cavities for quantum technologies.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144619158","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>In situ</i>confined construction of BiVO₄/pg-C₃N₄direct<i>Z</i>-heterostructures and its efficient degradation and photodynamic sterilization of rhodamine under visible light.","authors":"Wenyuan Li, Yuling Chen, Xiaolin Feng, Yanguang Chen, Xuanchun Hu, Caibai Yang, Yong Ye","doi":"10.1088/1361-6528/adf340","DOIUrl":"10.1088/1361-6528/adf340","url":null,"abstract":"<p><p>Photocatalytic degradation is increasingly recognized as a highly effective approach for the removal of organic pollutants and pathogenic microorganisms from wastewater. Nevertheless, conventional unit catalysts often fall short of practical requirements, primarily due to their limited efficiency in photoinduced electron-hole transfer and the scarcity of active sites. In this work, three-dimensional porous material pg-C₃N₄was synthesized utilizing the hard template method, employing dendritic mesoporous silica as the templating agent. And the nanoparticles of BiVO₄/pg-C₃N₄direct<i>Z</i>-heterojunction composite (BCN) were successfully constructed by using pg-C₃N₄as growth template and BiVO₄<i>in situ</i>directed growth. The heterogeneous surface morphology of pg-C₃N₄markedly enhances its capacity for visible light absorption and increases the availability of catalytic active sites. BCN demonstrates the ability to degrade 98% of Rhodamine B under simulated solar irradiation within 120 min and effectively inactivates 2 × 10⁷cfu ml^-1of<i>E. coli</i>under similar conditions within 60 min. Notably, after five cycles of use, the structural integrity and functional properties of the material remain largely unaltered. The superior photocatalytic degradation and photodynamic sterilization performance of BCN can be primarily attributed to its narrower band gap width of 2.34 eV, reduced electrochemical impedance, and enhanced separation and transfer rate of photogenerated carriers. Collectively, these properties facilitate the effective degradation of organic pollutants and the robust inactivation of bacteria by BCN under visible light irradiation. The successful implementation of this research offers a theoretical foundation and experimental insights for the future development of advanced<i>Z</i>-type photocatalysts.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144699105","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":"Electrochemical investigations of rare earth orthochromite (SmCrO₃) nanosponges for energy storage application.","authors":"Tapan Kumar Sarangi, Rashmita Panda, Bhagaban Kisan, Kusha Kumar Naik","doi":"10.1088/1361-6528/adf64c","DOIUrl":"10.1088/1361-6528/adf64c","url":null,"abstract":"<p><p>In this study, the electrochemical energy storage capability of hydrothermally synthesized samarium chromite (SmCrO₃) nanoparticles was thoroughly investigated, highlighting their potential application as electrode material in supercapacitor. Comprehensive structural, optical, morphological, and functional analyses were conducted using x-ray diffraction, UV-visible spectroscopy, Fourier-transform infrared spectroscopy, Photoluminescence spectroscopy, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy to confirm the successful formation of SmCrO₃nanoparticles. The electrochemical performance was evaluated in a three-electrode configuration employing 1 M KOH as the aqueous electrolyte, where cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy were carried out. The SmCrO₃nanoparticle electrode exhibited a high Cs of 1264.2 Fg^-1at a scan rate of 4 mVs^-1, along with an energy density of 573.7 Whkg^-1and a power density of 18 775 Wkg^-1, indicating excellent pseudocapacitive behavior. Furthermore, the synthesized electrode demonstrated outstanding cycling stability, retaining 93% of its initial capacitance even after 1000 charge-discharge cycles. These findings suggest that SmCrO₃nanoparticles are a promising candidate for advanced supercapacitor applications, offering a favorable combination of high electrochemical performance and long-term stability.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144760578","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":"Tailored energy landscapes for programmable skyrmion logic gate architectures.","authors":"Jayaseelan Dhakshinamoorthy, Hitesh Chhabra, Ajaya Kumar Nayak","doi":"10.1088/1361-6528/adf970","DOIUrl":"https://doi.org/10.1088/1361-6528/adf970","url":null,"abstract":"<p><p>Magnetic skyrmions offer an excellent prospect for the next-generation spintronic logic and memory applications due to their topological stability, nanoscale size, and efficient current-driven mobility. This work presents a programmable skyrmion-based logic architecture leveraging skyrmion-skyrmion repulsion and tunnelling through geometrically engineered racetracks. Using micromagnetic simulations, we demonstrate various logic gates (AND, OR, NOT, NAND, NOR, XOR) and a half-adder within a compact structure incorporating artificial nucleation centers, clocking notches, and annihilation zones, eliminating additional gate contacts. By carefully analysing the change in energy and the topological charge, designing and optimising logic gates to realise diverse operations with high reliability and efficiency is possible. Most importantly, our design avoids unnecessary skyrmion annihilation, reducing energy and spatial area. These results outline a scalable, energy-efficient strategy for reconfigurable logic-in-memory systems based on skyrmion dynamics.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144804460","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":"Ordered silicon nanowire bundle networks from aqueous dispersions.","authors":"David Tilve-Martinez, Felipe Lozano-Steinmetz, Isabel Gómez-Palos, Juan J Vilatela","doi":"10.1088/1361-6528/adef60","DOIUrl":"10.1088/1361-6528/adef60","url":null,"abstract":"<p><p>Many applications of nanowires require their processing in large volumes and assembly as ordered arrays with controlled density. Starting from aqueous dispersions of silicon nanowires stabilized through a cationic surfactant, we carry out vacuum filtration to form macroscopic paper-like networks. We controllably induce the assembly of SiNWs as ordered domains within the network, arising from a 2D nematic phase formed due to the relatively high SiNW concentration and long filtration time comparable to their rotational diffusion. The domains consist of bundles of around 15 nanowires, highly aligned parallel to each other (nematic order parameterS2D=0.71) and extending over several micrometers as micro-fibrils through nanowires linking adjacent domains. In the bundles, van der Waals forces hold the SiNWs together within less than 0.4 nm, which translates into a significant cohesive energy density above 2 J g^-1. Large-scale formation of bundles is visually evident through electron microscopy and detected by x-ray scattering. We measure changes in the structure factor of the SiNW network upon bundling, and find a new scattering peak (<i>q</i>= 16 nm^-1) arising from the inter-wire separation. By packing nanowires in domains with inter-wire separation at van der Waals interaction distance, while extending across lengths well beyond an individual nanowire, we provide a method to bridge scales and build macroscopic networks of ordered nanowires of different chemistries.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144637636","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":"Ag-decorated 2D CuO nanoflakes: a dual-functional material for solar-driven photocatalysis and antimicrobial applications.","authors":"Saraswati Mandi, Rajesh Mandal, Subhamay Pramanik, Partha Sarathi Das, Sourav Gorai, Subrata Raha, Sudeshna Samanta, Biswanath Mukherjee, Rajib Nath","doi":"10.1088/1361-6528/adf971","DOIUrl":"https://doi.org/10.1088/1361-6528/adf971","url":null,"abstract":"<p><p>Developing effective strategies to reduce and prevent water pollution due to excessive contamination by harmful pollutants is crucial. Consequently, there is a requirement to design new catalyst materials to enhance the efficiency of the oxidation processes for the wastewater management plant, ensuring the mineralization of trace organic pollutants. Here, we wisely modified the surfaces along with the morphology of copper oxide (CuO) nanostructures with silver (Ag) nanoparticles (~12-20 nm), a variety of Ag-decorated (~7-16%) CuO two-dimensional (2D) nanoflakes (length ~400 nm and width ~70 nm) with enhanced photocatalytic and antibacterial properties, that can provide sustainable solutions to present environmental remediation. Its photocatalytic efficiency, via degrading the toxic methylene blue dye effluent contamination, reaches 95% under sunlight. Furthermore, their antibacterial properties allow them to withstand Enterococcus faecalis, Pseudomonas aeruginosa, Escherichia coli, and Proteus mirabilis bacteria and exhibit superior antibacterial activity with large inhibition zone sizes (>10 mm), compared to their pristine (CuO) counterparts. Hence, we suggest that Ag-decorated CuO 2D nanoflakes possess promising potential for large-scale application in photocatalytic wastewater purification and bacterial disinfection under sunlight.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144804459","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":"Light effects on graphene/tungsten disulfide nanotubes/graphene heterostructure.","authors":"Enver Faella, Luca Lozzi, Luca Camilli, Alla Zak, Filippo Giubileo, Antonio Di Bartolomeo, Maurizio Passacantando","doi":"10.1088/1361-6528/adf2b1","DOIUrl":"10.1088/1361-6528/adf2b1","url":null,"abstract":"<p><p>In this study, we present a hybrid optoelectronic device consisting of tungsten disulfide nanotubes (NTs) deposited on graphene electrodes, forming ohmic contacts that enable efficient charge transport. The heterostructure is fabricated on a flexible polyethylene terephthalate substrate. Comprehensive electrical and optoelectronic characterizations are conducted under various environmental conditions, with a focus on photocurrent response and the photovoltaic effect. The device shows a broadband photoresponse from 405 to 900 nm, reaching its best performance at 880 nm, where it delivers a peak responsivity of 0.07 mA W^-1, a specific detectivity of 2.3 × 10⁷Jones and rise/decay constants of 1.6 s/1.5 s, measured under 405 nm illumination at an incident power of 0.19 mW. A long-time tail of 23 s is also observed, attributed to trap-assisted processes. The long-wavelength cut-off (∼ 880 nm) corresponds to an indirect bandgap of 1.4 ± 0.1 eV for the NTs. Under 520 nm illumination, the heterostructure generates an open circuit photovoltage of ∼15 mV and a short-circuit photocurrent of ∼0.08 nA, confirming the presence of a photovoltaic effect. Illumination at 405 nm reveals a photocurrent response that is sensitive to changes in environmental pressure. These results highlight the multifunctionality of the heterostructure, which can be optimized for photovoltaic conversion, wearable photodetectors, and sensing applications.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144691045","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":"Switchable five-function terahertz metasurface based on graphene and vanadium dioxide with single-sized nanostructure.","authors":"Juan Deng, Xinyu Zhu, Jiaxi Duan, Zhendong Huang, Shengming Wang, Xingyu Wang, Fan Gao, Yijun Tang, Danyang Xu","doi":"10.1088/1361-6528/adf560","DOIUrl":"10.1088/1361-6528/adf560","url":null,"abstract":"<p><p>Driven by the need for miniaturization and integration, incorporating multiple functions into a single metasurface based on hybridized tunable materials is particularly demanding in the terahertz (THz) range. However, existing hybrid material metasurfaces either need to change their sizes or cannot fully explore their design potential, particularly failing to integrate both near-field and far-field functions into a single metasurface, which restricts the development and application of terahertz metasurface devices. In this paper, combing with graphene and vanadium dioxide (VO₂), a multifunctional terahertz metasurface is designed with only a single-sized nanostructure, which can achieve five-functional switchable and integration. As a proof, the simulated metasurface can similarly be as a polarization conversion device, a broadband modulation device and an absorption-device, and more importantly, it can also realize the functions of the near-field nanoprinting imaging 'A' and far-field holographic imaging 'B'. The introduction of multiple tunable materials into a single terahertz metasurface and the simultaneous integration of the near- and far-field functions provide a new design platform for tunable multifunctional devices, which can contribute to the development of miniaturization and integration of terahertz devices.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743081","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":"Guiding the geometry of graphene nanoribbon heterojunction via surface-adsorbed 10,10'-dibromo-9,9'-bianthryl.","authors":"Changgang Xu, Tao Wang, Binghuang Zhong, Wenjie Ji, Mingzhi Zhang, Xiaoqing Liu, Mingming Fu, Yan Lu, Sheng Wei, Li Wang, Zhongping Wang","doi":"10.1088/1361-6528/adf562","DOIUrl":"10.1088/1361-6528/adf562","url":null,"abstract":"<p><p>Using 10,10'-dibromo-9,9'-biphenanthryl (DBBA) as a precursor, graphene nanoribbon (GNR) heterojunctions were synthesized on metal surfaces. On the Cu(110) surface, the strong interaction between DBBA molecules and the substrate limited the reaction pathway, resulting exclusively in the formation of graphene quantum dots via dehydrogenative cyclization. On Au(111), DBBA molecules underwent polymerization at elevated temperatures, yielding 7-atom-wide armchair GNRs (7aGNRs). These 7aGNRs could be further transformed into wider nanoribbons, such as 14aGNRs and 21aGNRs, through additional cyclization processes. Notably, by reducing the surface density of DBBA, unique heterostructures, including Y-type and T-type GNRs, were successfully fabricated. The T-type GNRs exhibited asymmetric heterojunctions, which provide a promising platform for engineering tunable bandgaps in GNRs. This study highlights precursor-molecule-substrate interactions in controlling GNR synthesis, advancing tailored graphene-based materials.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743078","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":"Nanotechnology a sustainable solution for food packaging: a comprehensive review.","authors":"Niharika V Rao, Aswin Ram Chidambaram, Paramveer Singh, Subhasha Nigam, Monika Joshi","doi":"10.1088/1361-6528/adf33f","DOIUrl":"10.1088/1361-6528/adf33f","url":null,"abstract":"<p><p>Innovations in the food packaging industry are necessary as they directly impact the food quality and human health. Nanotechnology has emerged as a promising approach towards the food industry, ranging from preservation to packaging. The current review has critically examined previously published work related to food packaging, highlighted knowledge gaps and proposed future research direction. The various food packaging nanomaterials for enhancing the shelf life, barrier properties, antibacterial activities, mechanical properties and scavenging activities are compiled in detail. Nanomaterial-enabled food packaging can prevent contamination and assure food safety, promoting good health that advocates sustainable development goal # 3. Additionally, regulatory guidelines concerning food safety have also been suggested. We believe that the review systematically entails the recent advances, concerns, and the future scope of nanotechnology in food packaging.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144699106","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}