Nanotechnology最新文献

{"title":"Hydrothermally designed Ag-modified TiO₂heterogeneous nanocatalysts for efficient hydrogen evolution by photo/electro/photoelectro-chemical water splitting.","authors":"Mohd Fazil, Norah Alhokbany, Syed Asim Ali, Tokeer Ahmad","doi":"10.1088/1361-6528/adbd48","DOIUrl":"10.1088/1361-6528/adbd48","url":null,"abstract":"<p><p>One compelling goal of carbon-neutrality is to advance sustainable energy applications through advanced functional nanomaterials for achieving remarkable performance in energy conversion processes, especially in green H₂energy. Here, Ag-modified TiO₂nanostructures with highly specific exposed surface sites have been fabricated hydrothermally, elucidating its prominence towards photocatalytic, and photo/-electrocatalytic H₂production. Further, the as-synthesized nanomaterials were investigated by XRD, electron microscopy (SEM/EDAX/TEM/HRTEM), ICP-MS, PL, Raman, UV-visible DRS, and BET surface area studies. The enhanced activity was established due to the exceptional optoelectronic properties and highly exposed active sites of the Ag-modified TiO₂nanocatalysts. The photocatalytic activity of 2.5% Ag-doped TiO₂photocatalyst demonstrated the highest hydrogen evolution, measuring 15.66 mmolgcat-1with 17.33% apparent quantum yield. Moreover, for photo-electrolysis, 1% and 2.5% Ag-doped TiO₂nanocatalysts exhibited significantly improved activity with Tafel slopes of 162.49, 87.56 mV dec^-1and onset potentials of 0.77 V (at 1.55 mA cm^-2), -0.96 V (at 10 mA cm^-2) for oxygen evolution reaction and hydrogen evolution reaction in alkaline and acidic conditions. Experiments indicated that incorporation of Ag ions in TiO₂boosted the H₂evolution due to the extraordinary surface properties and the presence of defect-sides /oxygen vacancies.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143573447","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":"Antiferromagnetic skyrmion-based energy-efficient leaky integrate and fire neuron device.","authors":"Namita Bindal, Md Mahadi Rajib, Ravish Kumar Raj, Jayasimha Atulasimha, Brajesh Kumar Kaushik","doi":"10.1088/1361-6528/adb8c1","DOIUrl":"10.1088/1361-6528/adb8c1","url":null,"abstract":"<p><p>The development of energy-efficient neuromorphic hardware using spintronic devices based on antiferromagnetic (AFM) skyrmion motion on nanotracks has gained considerable interest. Owing to their properties such as robustness against external magnetic fields, negligible stray fields, and zero net topological charge, AFM skyrmions follow straight trajectories that prevent their annihilation at nanoscale racetrack edges. This makes the AFM skyrmions a more favorable candidate than the ferromagnetic (FM) skyrmions for future spintronic applications. This work proposes an AFM skyrmion-based neuron device exhibiting the leaky-integrate-fire (LIF) functionality by exploiting either a thermal gradient or a perpendicular magnetic anisotropy (PMA) gradient in the nanotrack for leaky behavior by moving the skyrmion in the hotter region or the region with lower PMA, respectively, to minimize the system energy. Furthermore, it is shown that the AFM skyrmion couples efficiently to the soft FM layer of a magnetic tunnel junction, enabling efficient read-out of the skyrmion. The maximum change of 9.2% in tunnel magnetoresistance is estimated while detecting the AFM skyrmion. Moreover, the proposed neuron device has an energy dissipation of 4.32 fJ per LIF operation, thus paving the way for developing energy-efficient devices in AFM spintronics for neuromorphic computing.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468516","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":"Advances in spin properties of plant leaf-derived graphene quantum dots from materials to applications.","authors":"Yuan-Chih Hung, Jia-Ren Wu, Arun Prakash Periasamy, Nobuyuki Aoki, Chiashain Chuang","doi":"10.1088/1361-6528/adb851","DOIUrl":"10.1088/1361-6528/adb851","url":null,"abstract":"<p><p>Over the past decade, graphene quantum dots (GQDs) have gained an inexhaustible deal of attention due to their unique zero-dimensional (0D) and quantum confinement properties, which boosted their wide research implication and reliable applications. As one of the promising 0D member and rising star of the carbon family, plant leaf-derived GQDs have attracted significant attention from scholars working in different research fields. Owing to its novel photophysical properties including high photo-stability, plant leaf-derived GQDs have been increasingly utilized in the fabrication of optoelectronic devices. Their superior biocompatibility finds their use in biotechnology applications, while their fascinating spin and magnetic properties have maximized their utilization in spin-manipulation devices. In order to promote the applications of plant leaf-derived GQDs in different fields, several studies over the past decade have successfully utilized plant leaf as sustainable precursor and synthesized GQDs with various sizes using different chemical and physical methods. In this review, we summarize the Neem and Fenugreek leaves based methods of synthesis of plant leaf-derived GQDs, discussing their surface characteristics and photophysical properties. We highlight the size and wavelength dependent photoluminescence properties of plant leaf-derived GQDs towards their applications in optoelectronic devices such as white light-emitting diodes and photodetectors, as well as biotechnology applications such as<i>in vivo</i>imaging of apoptotic cells and spin related devices as magnetic storage medium. Finally, we particularly discuss possible ways of fine tuning the spin properties of plant leaf-derived GQD clusters by incorporation with superconducting quantum interference device, followed by utilization of atomic force microscopy and magnetic force microscopy measurements for the construction of future spin-based magnetic storage media and spin manipulation quantum devices so as to provide an outlook on the future spin applications of plant leaf-derived GQDs.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468510","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":"Boosted photocatalytic CO₂reduction through interface engineering by constructing CdS-MnO₂heterojunction.","authors":"Wenqiang Jiang, Xin Zhang, Shijie Zhang, Hui Li, Xiaoying Liu, Honglei Zhang, Yunyi Xiao, Runze Bi, Siyuan Du, Yawei Gu","doi":"10.1088/1361-6528/adbcb5","DOIUrl":"10.1088/1361-6528/adbcb5","url":null,"abstract":"<p><p>To mitigate the levels of CO₂in the atmosphere, photocatalytic conversion of CO₂into hydrocarbons presents a viable approach. Herein, a CdS-MnO₂composite synthesized through a facile electrostatic self-assembly method was employed as an effective catalyst for photocatalytic CO₂reduction. The engineered CdS-MnO₂minimized the recombination of photogenerated electrons and holes, thereby facilitating the charge transfer and boosting the catalytic activity of pristine CdS. The introduction of NaOH solution into the reaction environment further enhanced the interfacial electron transfer and increased the affinity to the key intermediate *CO, facilitating additional multielectron reactions for methanol production. The alkaline characteristics of NaOH solution not only promotes the adsorption and activation of inert CO₂molecules, but also function as hole scavengers, significantly reducing the photogenerated carrier recombination and further promoting the CO₂reduction, especially in multielectron reactions towards methanol. A notable yield of 13.4<i>μ</i>mol g^-1h^-1for methanol and 7.6<i>μ</i>mol g^-1h^-1for CO was obtained with the CdS-MnO₂. The results obtained herein may provide insights into the design of a highly efficient photocatalytic systems aimed at converting CO₂into higher value-added products.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143567764","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":"A critical review on printed electronics and its application.","authors":"Sritama Roy, Lakshmi Priya Ramakrishnan, Rangesh Vasudevan, Sridhar Chandrasekaran","doi":"10.1088/1361-6528/adbcb4","DOIUrl":"10.1088/1361-6528/adbcb4","url":null,"abstract":"<p><p>In light of the industry's environmental constraints, sustainable manufacturing technology has emerged as a critical goal for emerging applications. Due to the increased need for electronic production around the world, the requirement for environmentally safe technology is the necessity of this decade as the world government shifts towards sustainability in all manufacturing technology. Henceforth, printed electronics will be one such solution to regulate the electronic device and components production requirement of this decade. The article has discussed about the recent advances in inkjet-printed electronics across a wide range of electronics applications. We have discussed several inkjet printing inks and their formulation methods, which are required for minimizing environmental waste. In addition, we have discussed the future scope of printed electronics production and its impact on the economy as well as the environment.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143567762","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":"Recent advances in MXene catalyst towards enhanced hydrogen storage of Mg/MgH₂: a review.","authors":"Zhaoqian Yan, Wenguang Zheng, Gongtao Hao, Yajuan Wei, Mengmeng Luo","doi":"10.1088/1361-6528/adbb72","DOIUrl":"10.1088/1361-6528/adbb72","url":null,"abstract":"<p><p>Hydrogen is regarded as an ideal substitute for fossil fuels on account of its advantages of high energy density, zero carbon emissions, and abundant reserves. Solid-state hydrogen storage is one of the most promising hydrogen storage methods in terms of high-volume storage density and safety. MgH₂is a promising solid hydrogen storage material because of its high hydrogen storage capacity and favorable cycle reversibility. Nevertheless, its inferior thermodynamic and kinetic properties restrict its extensive application. Catalyst modification is considered to be an efficient way to enhance the thermodynamic and kinetic properties of hydrogenation and dehydrogenation for MgH₂. This review summarizes the latest research progress on MXene-based composites, such as MAX, single metal MXene, bimetallic MXene, MXene/elemental metal, and MXene/transition metal compounds for promoting the hydrogen storage performances of MgH₂. At the same time, the catalyst of MXene-based composites to optimize the hydrogenation/dehydrogenation kinetics, long cycle performance and catalytic mechanism of Mg/MgH₂are discussed in detail.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527878","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":"Effect of capping on the Dirac semimetal Cd₃As₂on Si grown via molecular beam epitaxy.","authors":"Wei-Chen Lin, Chiashain Chuang, Chun-Wei Kuo, Meng-Ting Wu, Jie-Ying Lee, Hsin-Hsuan Lee, Cheng-Hsueh Yang, Ji-Wei Ci, Tian-Shun Xie, Kenji Watanabe, Takashi Taniguchi, Nobuyuki Aoki, Jyh-Shyang Wang, Chi-Te Liang","doi":"10.1088/1361-6528/adbb74","DOIUrl":"10.1088/1361-6528/adbb74","url":null,"abstract":"<p><p>Given the promising applications of large magnetoresistance in the Dirac semimetal cadmium arsenide (Cd₃As₂), extensive research into Si-compatible Cd₃As₂devices is highly desirable. To prevent surface degradation and oxidation, the implementation of a protection layer on Cd₃As₂is imperative. In this study, two vastly different protecting layers were prepared on top of two Cd₃As₂samples. A zinc telluride layer was grown on top of one Cd₃As₂film, giving rise to a ten-fold increased mobility, compared to that of the pristine Cd₃As₂sample. Interestingly, unusual negative magnetoresistance is observed in the hexagonal boron nitride-capped Cd₃As₂device when a magnetic field is applied perpendicularly to the Cd₃As₂plane. This is in sharp contrast to the chiral anomaly that requires a magnetic field parallel to the Cd₃As₂plane. We suggest that a protection layer on molecular beam epitaxy-grown Cd₃As₂should be useful for realising its great device applications in magnetic sensing.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527877","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":"Capacitance effects of nanopore chips on ionic current modulation and noise characteristics.","authors":"Kabin Lin, Chen Chen, Dongxuan Li, Haoyong Li, Jinzhu Zhou","doi":"10.1088/1361-6528/adb6a5","DOIUrl":"10.1088/1361-6528/adb6a5","url":null,"abstract":"<p><p>Solid-state nanopores exhibit adjustable pore size, robust chemical and thermal stability, and compatibility with semiconductor fabrication, positioning them as versatile platforms for nanofluidic applications and single-molecule detection. However, their higher noise levels compared to biological nanopores hinder their sensitivity in detecting biomolecules such as DNA and proteins. Enhancing detection sensitivity requires an in-depth understanding of noise sources and strategies for noise reduction. Here, we construct an equivalent circuit model of solid-state nanopores and conduct corresponding experiments to evaluate how chip capacitance, salt concentration, applied voltage, and pore size influence ionic current noise. We find that chip capacitance is the dominant factor affecting ionic current noise, with minimal noise sensitivity to salt concentration below 0.1 M but pronounced increases above this threshold. The pH has little impact on noise, whereas higher applied voltages elevate noise at high salt concentrations. Introducing a SiO₂layer between SiN<i>_x</i>and Si significantly reduces chip capacitance; a 1000 nm SiO₂layer reduces capacitance to 7.9 pF, decreasing ionic current noise to 18.7 pA for a 2.2 nm nanopore in 1 M KCl at 40<i>μ</i>m membrane side length and 100 mV and 10 kHz sampling. This reduction in capacitance improves response time and measurement accuracy, marking a critical advancement for high-sensitivity applications of solid-state nanopores.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143441234","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":"Diamond nanoneedles for biosensing.","authors":"Mariam Quarshie, Lena Golubewa, Caterina Giraulo, Silvana Morello, Claudia Cirillo, Maria Sarno, Bo Xu, Priyadharshini Balasubramanian, Yuliya Mindarava, Marijonas Tutkus, Alexander Obraztsov, Fedor Jelezko, Polina Kuzhir, Sergei Malykhin","doi":"10.1088/1361-6528/adb8f4","DOIUrl":"10.1088/1361-6528/adb8f4","url":null,"abstract":"<p><p>Nanoparticles and nanomaterials are revolutionizing medicine by offering diverse tools for diagnosis and therapy, including devices, contrast agents, drug delivery systems, adjuvants, therapeutics, and theragnostic agents. Realizing full applied potential requires a deep understanding of the interactions of nano dimensional objects with biological cells. In this study, we investigate interaction of single-crystal diamond nanoneedles (SCDNNs) containing silicon vacancy (SiV^-) color centers with biological substances. Four batches of the diamond needles with sizes ranging between 200 nm and 1300 nm and their water suspensions were used in these studies. The human lung fibroblast cells were used for the proof-of-concept demonstration. Employing micro-photoluminescence (PL) mapping, confocal microscopy, and lactate dehydrogenase (LDH) viability tests, we evaluated the cellular response to the SCDNNs. Intriguingly, our investigation with PL spectroscopy revealed that the cells and SCDNNs can coexist together with approved efficient registration of SiV^-centers presence. Notably, LDH release remained minimal in cells exposed to optimally sized SCDNNs, suggesting a small number of lysed cells, and indicating non-cytotoxicity in concentrations of 2-32<i>µ</i>g ml^-1. The evidence obtained highlights the potential of SCDNNs for extra- or/and intracellular drug delivery when the surface of the needle is modified. In addition, fluorescent defects in the SCDNNs can be used for bioimaging as well as optical and quantum sensing.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143472598","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":"The SiP nanotubes as potential metal-free photocatalyst: a density functional theory study.","authors":"Chao Wang, Xuan Hui, Yingtao Zhu, Huanyu Zhao, Weijun Cao","doi":"10.1088/1361-6528/adb9ee","DOIUrl":"10.1088/1361-6528/adb9ee","url":null,"abstract":"<p><p>Hydrogen generation via photocatalytic water splitting holds significant potential as a strategy to tackle energy crises and environmental degradation. We investigated the electronic and photocatalytic properties of silicon phosphide (SiP) single-walled nanotubes as potential photocatalysts employing HSE06 hybrid density functional along with all-electron Gaussian basis sets. Relative to the monolayer, the band gap of nanotube is reduced (e.g. 1.99 eV for (55, 0)), and the nature of electron transfer in nanotube changes to direct which can extend the visible light absorption range. Moreover, the hydrogen production rate for SiP (55, 0) nanotube increases from 9.97% to 12.41%. Calculations of the band edge positions under various pH conditions indicate that nanotubes exhibit strong reduction capabilities. Within the pH value between 0 and 7 nanotubes with a radius exceeding 40 Å can split water into H₂and O₂simultaneously under sunlight irradiation. Applying tensile and compressible strain can effectively enhance the oxidation ability for overall water splitting due to downward valance band edge. Furthermore, the difference in mobility between the (50, 0) nanotube electrons (140.68 cm²v^-1s^-1) and hole (4.26 cm²v^-1s^-1) suggests that electron-hole recombination can be mitigated. Based on the above findings, we hypothesize that SiP nanotubes should be a potential metal-free photocatalyst.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143502681","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}