Nanotechnology最新文献

{"title":"Percolation theory-based KMC simulation for scaled Fe-FET based multi-bit computing-in-memory with temperature compensation strategy.","authors":"Qingxiao Zhu, Lihua Xu, Zhidao Zhou, Wei Wei, Pan Xv, Chunmeng Dou, Lingfei Wang, Qing Luo, Ling Li","doi":"10.1088/1361-6528/ada4b8","DOIUrl":"https://doi.org/10.1088/1361-6528/ada4b8","url":null,"abstract":"<p><p>In this letter, we investigated the impact of percolation transport mechanisms on ferroelectric field effect transistor (FeFET) multi-value storage with Kinetic Monte-Carlo (KMC) simulation considering aspect ratio and temperature dependencies. It is found that the portion of the ferroelectric polarization, which dominated the threshold voltage shift of the FeFET, increases when aspect ratio of device decreases. Moreover, randomness of percolation path formation and variations of equivalent conductance can be suppressed, indicating mitigation of device-to-device variations and enhancement of separation of individual states. Besides, to further investigate an amorphous channel promising in multi-bit applications, disorder effects in channel contribute to intrinsic percolation transport, coupling with multi-domain dynamics in Fe-layer, are studied by the high temperature characterization. On this basis, the KMC scheme is further modified to predict multi-value distribution from 300 K to 400 K. To tackle with such critical reliability issues induced inaccuracy for in-memory computing (CIM), an efficient write-verify scheme is proposed to mitigate state overlapping and provides in-depth insights for co-design of device reliability and multi-bit CIM performances.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142920590","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":"Modulating the properties of g-C3N4 through two-step annealing and ionic-liquid gating.","authors":"Na Sa, Kaiqi Nie, Yi Sheng Ng, Tielong Deng, Jinfeng Xu, Weichao Wang, Yixiao Deng, Jia-Ou Wang, Junyong Kang, Jin-Cheng Zheng, Meng Wu, Hui-Qiong Wang","doi":"10.1088/1361-6528/ada4b7","DOIUrl":"https://doi.org/10.1088/1361-6528/ada4b7","url":null,"abstract":"<p><p>We reported a novel strategy by the combination of two-step annealing treatment and ionic-liquid gating technology for effectively regulating the properties of g-C3N4, especially largely reducing the recombination rate of the electron-hole pairs, with evidenced by the remarkable reduction of photoluminescence (PL) intensity. Firstly, graphitic carbon nitrides with typical layered structure were obtained by annealing melamine with temperature above 500°C. Further annealing at 600°C with much longer time (from 2 hours to 12 hours) were found to effectively reduce the imperfections or defects, and thus the PL intensity (49% reduction). Secondly, by post-treating annealed sample with ionic liquid, the PL were found to be further reduced, mainly due to the passivation of charged defect centers by ionic liquid. Additionally, applying an external electric field in an ionic liquid (IL) environment significantly enhance charged defect passivation. The ionic liquid gating resulted in a larger bandgap and further reduced PL intensity. This study demonstrates a new approach for defect passivation, providing insights and strategies for modulating properties of advanced materials such as g-C3N4.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142922256","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":"Sustainable fabrication of Fe2O3/C nanoparticles via acacia nilotica extract for enhanced supercapacitor performance.","authors":"Nazish Parveen Parveen, Enshirah Da'na, Amel Taha","doi":"10.1088/1361-6528/ada44a","DOIUrl":"https://doi.org/10.1088/1361-6528/ada44a","url":null,"abstract":"<p><p>This research investigates the eco-friendly production of iron oxide nanoparticles and their combination with carbon to create the FeC-1and FeC-2 NPs, using seedless pods of Acacia nilotica. These pods, rich in tannins and flavonoids, serve as a natural reducing, stabilizing, and carbon source. The study details the synthesis of FeC NPs through a non-toxic, green method and examines the influence of varying concentrations of Acacia nilotica extract (ANE) on the electrochemical characteristics of the resulting n FeC-1and FeC-2 electrodes. Both FeC-1and FeC-2 NPs were tested extensively using cyclic voltammetry and galvanostatic charge-discharge methods to evaluate their pseudocapacitive properties in a three-electrode setup. The FeC-2 electrodes showed much better performance, achieving a specific capacitance of 482.85 F/g, compared to FeC-1's 155.71 F/g. This enhanced capacity is attributed to an optimal content that notably boosts conductivity. Additionally, FeC-2 showed impressive cyclic stability, retaining approximately 80% capacity at a constant current density. These findings underscore the potential of using ANE for developing cost-effective and environmentally benign FeC-1 and FeC-2 NPs with promising applications in high-performance supercapacitors.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142910071","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":"Cross-alignment of silver nanowires network for efficient nanowelding.","authors":"Chao Wang, Bo Song, Xin Zhai, Che Zhang, Mengyang Du, Yanqin Miao, Peng Dong","doi":"10.1088/1361-6528/ada449","DOIUrl":"https://doi.org/10.1088/1361-6528/ada449","url":null,"abstract":"<p><p>The performance of sliver nanowire (AgNWs) network flexible transparent electrodes is limited by large contact resistance, making it necessary to perform nanowelding to improve conductivity of the network. However, not all nanowire junctions can be welded. Our work indicates that the welding kinetics between nanowires depend on the crossing angle, with higher surface diffusion velocity prone to welding and fracture at nanowire junctions of crossing angles close to 90 degrees. The impact of nanowire crossing angles on the welding process makes it difficult to achieve simultaneous welding of random AgNWs networks. To address this issue, we adopted an improved Meyer rod coating method to prepared a cross-aligned nanowire network based on a layer-by-layer assembly strategy. Compared to randomly distributed AgNWs networks (11.17Ω/sq, 85.2%), the cross-aligned AgNWs network achieved simultaneous welding of nanowire junctions during thermal annealing, further enhancing the optoelectronic performance (10.8Ω/sq, 90.3%) of the AgNWs network, resulting in a superior figure of merit (FoM) value of 421.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142910035","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":"Construction and synthesis of NiCo₂O₄nanozyme for enhanced antibacterial performance.","authors":"Luchen Zhang, Shuanglong Wang, Ainong Fang, Pengcheng Hu, Yanhui Zhao, Xiaona Sun, Xiaopeng Lan, Yuan Liu, Chunzhao Liu, Chunlei Liu","doi":"10.1088/1361-6528/ad9d49","DOIUrl":"10.1088/1361-6528/ad9d49","url":null,"abstract":"<p><p>Developing effective and low-cost enzyme-like nanomaterials to kill bacteria is vital for human health. Herein, nanorod-assembled NiCo₂O₄microspheres were prepared though a facile hydrothermal method, andshowed highly enhanced peroxidase-like activity compared to pure Co₃O₄due to its large surface area and abundant active sites. The NiCo₂O₄possess the ability to catalyze H₂O₂to generate large amounts of •O^2-, which can be used for bacteriostatic applications. In particular, the antibacterial system combining the spiky NiCo₂O₄particles and a low concentration of H₂O₂(100<i>μ</i>M) exhibits an excellent bacteriostatic efficiency against both<i>Escherichia coli</i>(94.44%) and<i>Staphylococcus aureus</i>(93.45%).</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142813527","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":"Investigation of EMI-shielding properties of buckypaper manufactured with an easily scalable method.","authors":"Zaur Nuriakhmetov, Yuri Chernousov, Dmitry Smovzh, Vladimir Andryushchenko","doi":"10.1088/1361-6528/ada03b","DOIUrl":"10.1088/1361-6528/ada03b","url":null,"abstract":"<p><p>This paper presents a straightforward and easily scalable method for producing buckypapers. These thin films consist of single-walled carbon nanotubes (SWCNTs) dispersed on a PET substrate using an airbrushing technique, followed by solvent evaporation. Notably, this process requires minimal equipment complexity. The study investigates the electrical properties of buckypapers made from both purified and unpurified SWCNTs, as well as chemical vapor deposition graphene. Specifically, we focus on their electromagnetic interference (EMI) shielding effectiveness in the<i>S</i>-band of microwaves (2-4 GHz). To evaluate this, we installed buckypaper and graphene plates within a waveguide cross section. The results show that these buckypapers exhibit high overall shielding effectiveness. It is found that buckypapers based on purified carbon nanotubes have higher shielding parameters (due higher electrical conductivity measured by TRL method) than those based on unpurified CNTs. In summary, our approach offers a practical route for manufacturing effective EMI shielding materials, with potential applications in various technological domains.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142846525","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":"Comparative performance analysis of mixed metal oxide sensors for dual-sensing leveraging machine learning.","authors":"R Binowesley, Kirubaveni Savarimuthu, M Emimal","doi":"10.1088/1361-6528/ad947e","DOIUrl":"10.1088/1361-6528/ad947e","url":null,"abstract":"<p><p>This paper presents the synthesis of mixed metal oxide (BaTiO₃: ZnO) (B: Z) sensors with various molar ratios using a low-temperature hydrothermal method for dual sensing applications (gas and acceleration). The sensor developed with an equal molar ratio of 1B:1Z, showcases superior performance compared to unmixed and alternative mixed metal oxide sensors. This equilibrium in ratios optimally enhances synergistic effects between elements B and Z, resulting in improved sensing properties. Furthermore, it contributes to structural stability, enhancing performance in gas and acceleration sensing. A decreased band gap of 2.82 eV and a rapid turn-on voltage of 0.18 V were achieved. The acceleration performance of 1B:1Z sensor exhibits a maximum voltage of 2.62 V at a 10 Hz resonant frequency and an output voltage of 2.52 V at 1 g acceleration, achieving an improved sensitivity of 3.889 V g^-1. In addition, the proposed gas shows a notable sensor response of ∼63.45% (CO) and 58.29% (CH₄) at 10 ppm with a quick response time of 1.19 s (CO) and 8.69 s (CH₄) and recovery time of 2.09 s (CO) and 8.69 s (CH₄). Challenges in selectivity are addressed using machine learning, employing various classification algorithms. Linear discriminant analysis achieves superior accuracy in differentiating between CO and CH_4,reaching 96.6% for CO and 74.6% for CH₄at 10 ppm. Understanding these concentration-dependent trends can guide the optimal use of the sensors in different current applications.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142682416","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 nanomaterials for radiation protection in the aerospace industry: a systematic review.","authors":"Antonio Said Webbe Sales, Vinicius de Queiroz Pereira, Airton Natanael Coelho Dias","doi":"10.1088/1361-6528/ada38f","DOIUrl":"https://doi.org/10.1088/1361-6528/ada38f","url":null,"abstract":"<p><p>Nanomaterials stand out for their exceptional properties and innovative potential, especially in applications that protect against space radiation. They offer an innovative approach to this challenge, demonstrating notable properties of radiation absorption and scattering, as well as flexibility and lightness for the development of protective clothing and equipment. This review details the use of polymeric materials, such as polyimides (PIs), which are efficient at attenuating ultraviolet (UV) radiation and atomic oxygen (AO). For example, polyimides show a decrease in elongation at break by 10% after exposure to VUV radiation of 2000 equivalent solar hours (ESH). The thermal stability under vacuum ultraviolet (VUV) irradiation shows that colorless polyimides like CPI-T/Al exhibit an onset degradation temperature of 451°C, while CPI-L/Al shows a degradation onset of 439° C. Additionally, advancements in composite materials for gamma and neutron radiation shielding are covered. Materials such as fluorinated hyperbranched polyimides (FHBPI) display a decomposition temperature of approximately 450°C, which ensures structural integrity during space missions involving radiation. Radiation absorption and scattering properties of these composites are assessed, with materials such as W-Bi2O3 demonstrating a high linear attenuation coefficient (LAC) of 2.5 MeV, enhancing their efficiency in protecting against gamma radiation. Mechanical and optical changes, such as a 15% increase in solar absorbance after exposure to VUV, are critical for prolonged space missions. Moreover, the integration of nanoparticles like graphene and carbon nanotubes into polymers has proven to be an efficient strategy for improving the shielding properties and stability of materials. Nanocomposites like BNTT-Ti display a neutron transmission reduction of 20%, further validating their potential for space applications. Future investigations will focus on optimizing the functionality, manufacturing, and compatibility of composite materials, as well as validating their performance under actual space mission conditions. Collaboration among material scientists, aerospace engineers, and space agencies is vital to transforming laboratory discoveries into viable solutions for radiation protection in space.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142896460","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":"Spectroscopic amplifier for ultrahigh plasmonic-based enhancement of the Hyper-Raman scattering procedure.","authors":"Mohammed Alsawafta","doi":"10.1088/1361-6528/ada36c","DOIUrl":"https://doi.org/10.1088/1361-6528/ada36c","url":null,"abstract":"<p><p>An anisotropic plasmonic trimer is proposed as an effective spectroscopic amplifier for the maximum signal enhancement of the Hyper-Raman Scattering (HRS) process. The three-particle system is composed of asymmetric Au nanorings arranged collinearly in a J-aggregate configuration and illuminated by a longitudinally polarized light. The optical properties of the considered trimer have been numerically simulated by the Finite-Difference Time-Domain (FDTD) method. The extinction profile of the heterotrimer exhibits the excitation of two plasmonic bands, superradiant and subradiant (Fano interference) modes. From the associated highly enhanced and strongly localized nearfield, the Enhancement Factor of the Surface-Enhanced HRS (EFSEHRS) is calculated. The simulation results demonstrate the impact of both the thickness and height of the interacting rings on the Raman factor. To reach the desired value of the EFSEHRS, the thickness of the rings should be maximized, and their height must be minimized. These two factors work together to enormously increase the charge density accumulated in the intercoupling region, the associated nearfield intensity, and therefore significantly augment the corresponding EFSEHRS. The EFSEHRS increases exponentially with decreasing height and increasing thickness of the trimer system. For selected values of both thickness and height, EFSEHRS can reach a value never reported before, as high as 5.6x1023.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142896461","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 deposition of Ni on arrays of GaAs nanowires with n-type channels.","authors":"Vasilii Alexandrovich Kuzmin, Dmitry Vladimirovich Mokhov, Tamara Narcissovna Berezovskaya, Anatoly Oizerovich Monastyrenko, Alexei Bouravleuv","doi":"10.1088/1361-6528/ada2f2","DOIUrl":"https://doi.org/10.1088/1361-6528/ada2f2","url":null,"abstract":"<p><p>The processes of electrochemical deposition of Ni on vertically aligned GaAs nanowires (NWs) grown by molecular-beam epitaxy (MBE) using Au as a growth catalyst on Si(111) substrates were studied. Based on the results of electrochemical deposition, it was concluded that during the MBE synthesis of NWs the self-induced formation of conductive channels can occur inside NWs, thereby forming quasi core-shell nanowires. Depending on the length of the channel compare to the NW heights and the parameters of electrochemical deposition, the different hybrid metal-semiconductor nanostructures, such as Ni nanoparticles on GaAs NW side walls, Ni clusters on top ends of GaAs NWs, core-shell Ni/GaAs NWs, were obtained.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142886001","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}