Nanotechnology最新文献

{"title":"Geometrically asymmetricBC3monolayer as a thermal diode: a molecular dynamics study.","authors":"Farrokh Yousefi, Omid Farzadian, Mehdi Shafiee","doi":"10.1088/1361-6528/ae0cd2","DOIUrl":"10.1088/1361-6528/ae0cd2","url":null,"abstract":"<p><p>In this study, we employ non-equilibrium molecular dynamics simulations to investigate the unique thermal transport properties of an asymmetricBC3monolayer. We demonstrate the existence of<i>infinite thermal rectification</i>, wherein heat flows preferentially in one direction with complete suppression in the reverse, mimicking the behavior of an electrical diode. This phenomenon is attributed to the<i>negative thermal conductivity</i>that arises below a critical temperature difference, referred to as the transition point, where the heat counterintuitively flows from the cold reservoir to the hot one. Furthermore, the system exhibits a spontaneous heat current, allowing persistent heat flow even in the absence of an applied temperature gradient. These remarkable behaviors suggest promising applications in passive cooling, fuel-free refrigeration, and thermal logic devices. We further analyze the impact of geometric and thermal parameters, including length, width, and temperature, on the system's heat conduction and rectification performance. To explain the underlying mechanisms, we propose an analytical model based solely on geometric asymmetry, which shows excellent agreement with our simulation results. Overall, our findings establish theBC3monolayer as a promising platform for efficient nanoscale thermal control.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145192193","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":"Rotational chemical bath deposited flexible MnO₂/MXene thin film as an electrode for all solid state asymmetric supercapacitor.","authors":"Rutuja A Chavan, Gokul P Kamble, Akash S Rasal, Sanjay S Kolekar, Jia-Yaw Chang, Anil Vithal Ghule","doi":"10.1088/1361-6528/ae0cd0","DOIUrl":"10.1088/1361-6528/ae0cd0","url":null,"abstract":"<p><p>MXenes are stealing the spotlight due to their metallic conductivity and hydrophilicity; however, the restacking of 2D layers in MXene hampers the electrochemical performance. On the contrary, MnO₂is considered a promising electrode material for its variable oxidation states, but its weak conductivity limits practical applications. Taking the complementary properties, studies on the<i>in-situ</i>synthesis of MnO₂@MXene by chemical bath deposition (CBD) for energy-related (supercapacitor) applications have not yet been explored. Thus, exploring the opportunity for the first time to examine the performance of MnO₂/Ti₃C₂T<i>_x</i>supercapacitor applications by directly growing nano architectures on a flexible stainless steel mesh substrate utilising a binder-free synthesis approach was of our interest. With this motivation, the present investigation deals with a MnO₂/Ti₃C₂T<i>_x</i>(MnO₂/MXene) composite thin film designated as an MMC electrode deposited on the stainless steel mesh (300 mesh size) via an<i>in-situ</i>modified CBD method called rotational CBD (R-CBD). The synthesised MMC exhibits an excellent specific capacitance of 1130 F g^-1when compared to MnO₂(628.3 F g^-1) and MXene (32.5 F g^-1) at a current density of 1 mA cm^-2. A flexible MnO₂/MXene//MXene-based asymmetric supercapacitor device exhibited specific capacitance of 43.7 F g^-1at 2 mA cm^-2current density, maximum energy density (6.06 Wh kg^-1), and power density (0.6 kW kg^-1).</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145192186","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":"Pseudo-SAMOs array in positively charged semiconductor single-walled carbon nanotubes.","authors":"S A Votyakov, A V Osadchy, E D Obraztsova","doi":"10.1088/1361-6528/ae08bc","DOIUrl":"10.1088/1361-6528/ae08bc","url":null,"abstract":"<p><p>Super Atom Molecular Orbitals (SAMOs) are electronic excited states found in fullerenes in which an electron is excited to one or, more generally, several virtual orbitals with hydrogen like character. The existence of hydrogen-like metastable SAMO states has previously been demonstrated both experimentally and theoretically in fullerenes. In single-walled carbon nanotubes (SWCNTs), the existence of similar states with a maximum in the center of the hollow structure was theoretically demonstrated. In fullerenes, the SAMOs were classified according to their localization form by the orbital quantum number and named s, p, d-SAMOs. In this paper, we show the existence of different states with a maximum in the center of the SWCNTs, which are called pseudo-SAMOs. For the first time in SWCNTs, high-energy pseudo-SAMOs, which appear under high positive charging of the structure, have been demonstrated. As the positive charge of the SWCNT increases, the number of these states also increases as the depth of the Coulomb potential well increases. In the cross-section of the nanotube, the pseudo-SAMOs resemble the SAMOs in fullerenes, but due to the cylindrical symmetry of the nanotube, their shape along the tube axis z deviates from the shape of spherically symmetric wave functions. It is shown that quantization of pseudo-SAMOs along the<i>z</i>-axis occurs in finite SWCNTs, and the pseudo-z quantum number is used in addition to their characterization. For pseudo-SAMOs, the general set of quantum numbers does not repeat: in the case of invariance of the principal and orbital quantum numbers, the magnetic quantum number (the orientation of the orbital in space) changes. In the case of finite structures for pseudo-SAMOs with the same principal and orbital quantum number, the pseudo-z quantum number increases with increasing state number. The lifetimes of the pseudo-SAMOs in the finite SWCNT were estimated. In this nanotube, the lifetime of the pseudo-SAMOs is 1-2 orders of magnitude longer than the lifetime of the surface-localized states and is generally in the order of 10^-8s.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145086483","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":"Enhanced cytotoxicity of cisplatin-loaded Brij S100-alginate-taurine nanogels against HeLa cervical cancer cells.","authors":"Phuong Le Thi, Hoai Tam Nguyen, Viet Quoc Nguyen, Ha Tran Nguyen, Tien Thinh Nguyen, Van Toan Nguyen","doi":"10.1088/1361-6528/ae0cd1","DOIUrl":"10.1088/1361-6528/ae0cd1","url":null,"abstract":"<p><p>Water-insoluble anti-cancer drug delivery systems play a vital role in enhancing the effectiveness, stability, and selectivity of chemotherapeutic agents. By improving these properties, such systems offer better clinical outcomes, reduced systemic toxicity, and expanded therapeutic options, particularly for cancers that exhibit resistance to conventional treatments. In this context, nanogel-based delivery platforms constructed from Brij S100 grafted with alginate have demonstrated considerable promise. Two formulations were studied: Brij-Alg and Brij-Alg-Tau, the latter featuring surface modification of Brij-Alg nanogel particles with taurine molecules. These nanogels were used to encapsulate the anti-cancer drug cisplatin. The resulting drug-loaded nanogels exhibited desirable physicochemical characteristics, including optimal particle size, morphology, surface charge, and controlled drug release profiles suitable for targeted drug delivery applications. Importantly, both Brij-Alg and Brij-Alg-Tau nanogels displayed excellent biocompatibility, with minimal cytotoxicity toward fibroblast cells, indicating their safety for biological use. Cytotoxicity assay against the HeLa cervical cancer cell line revealed that Brij-Alg-Tau/CIS nanogels induced significantly greater cell death than both free CIS and Brij-Alg/CIS nanogels. The enhanced cytotoxicity is attributed to improved cellular uptake and sustained drug release enabled by the taurine-functionalized nanogel structure. These findings suggest that Brij-Alg-Tau nanogels are a promising vehicle for CIS delivery and hold strong potential for advancing cervical cancer therapy.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145192259","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":"Seamless 2D-MoS₂/3D-Si heterojunctions for white light detection applications.","authors":"Santanu Das, Jogendra Singh Rana, Ummiya Qamar, Satyabrata Jit","doi":"10.1088/1361-6528/ae09b5","DOIUrl":"10.1088/1361-6528/ae09b5","url":null,"abstract":"<p><p>In this study, we investigate the quality of junction formation and its impact on the electronic and optoelectronic properties of two-dimensional (2D) multilayered molybdenum disulfide (MoS₂) films directly grown on three-dimensional (3D) p-type silicon (p-Si) (110) substrates. Large-area (15 mm × 15 mm), few-layer (8-10 layers) MoS₂films were synthesized using a facile vapor-phase transport method, achieving seamless integration with the underlying Si substrate. Comprehensive structural and morphological characterizations confirm the uniform growth of multilayer 2D-MoS₂and the formation of a well-defined 2D/3D MoS₂/Si heterojunction interface. The vertical MoS₂/Si heterostructure exhibits a maximum photocurrent of ∼2.131 × 10^-6A and a responsivity of ∼13.31 A W^-1under white light illumination of 20<i>µ</i>W cm^-2at a bias voltage of -3 V. These results highlight the critical role of engineered heterointerfaces in enhancing device performance, including improved adhesion and charge transport across the active layers. This work demonstrates the feasibility of integrating a variety of 2D materials, including 2D-MoS₂, with silicon platforms for complementary metal oxide semiconductor (CMOS) compatible optoelectronic applications. The findings present promising opportunities for developing next-generation photosensors, photodetectors, p-n heterojunction diodes, and vertical junction transistors based on 2D/3D hybrid architectures.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145125277","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":"Biopolymer derived nanofibers for sustainable solutions: a systematic review.","authors":"Vimala S K Bharathi, Muhammad Zubair, Aman Ullah","doi":"10.1088/1361-6528/ae0a58","DOIUrl":"10.1088/1361-6528/ae0a58","url":null,"abstract":"<p><p>The future for nanofibers made from biopolymers is promising, due to their unique feature such as a large surface area, tunable porosity, and functional adaptability. This review delves into the progress in sustainable nanofiber technology, with a focus on biological macromolecules such as cellulose, chitosan, bacterial cellulose, zein, alginate, and gelatin. These bio-based polymers are also compared to synthetic ones, including polycaprolactone, poly(lactic acid), polyvinyl alcohol, and poly(ethylene glycol). These materials are essential in agriculture, food technology, and biomedicine. The study examines various fabrication methods, emphasizing electrospinning for its flexibility and effectiveness. It also looks at interaction mechanisms that improve nanofiber properties for biomedical uses (such as wound healing, drug delivery, and bone tissue engineering), active food packaging, and controlled agrochemical release. A bibliometric analysis over the past 25 years indicates a transition from basic research to practical innovations in nanofiber-based coatings, hydrogels, encapsulants, and sensors. This review highlights the pressing need for more research on biodegradable and biofunctional nanofiber materials, advocating for eco-friendly alternatives to synthetic polymers in different industries. Future advancements should aim at optimizing large-scale production, boosting biocompatibility, and enhancing multifunctional properties to support global sustainability efforts.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145131617","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":"Flame spray pyrolysis of onion-like carbon nanostructures and composites containing reduced titania: A study on their morphological and optical features.","authors":"Muhammad Tanveer, Anna Lähde","doi":"10.1088/1361-6528/ae10c2","DOIUrl":"https://doi.org/10.1088/1361-6528/ae10c2","url":null,"abstract":"<p><p>Carbon nano onions (CNOs) exhibit unique structural and morphological features owing to graphitic layered structures. However, these nanostructures present limited optical activity in visible region due to their higher degree of sp2 hybridization which results in fast recombination of charge carrier species. This necessitates the structural modification of CNOs to impart redshift absorption. Previously, doping of metals and non-metals have been reported for the structural modifications, however, incorporation of metal oxides and their contribution to optical features have not been yet studied. This study specifically demonstrates one step synthesis of visible light driven TiO2 embedded CNOs via modified flame spray pyrolysis (FSP) and provides insights about their structural and optical features. Transmission electron microscopy (TEM) results show that CNO composites present core to shell morphology and TiO2 particles are embedded in the layered structures. Inner core of CNOs is associated with organic carbon (OC) while elemental carbon (EC) is responsible for the outer shell which originates due to high temperature residence time and thereby formation of higher EC4-6 fractions in the closed FSP. Thermal optical carbon analysis shows that core to shell ratio is proportionally affected by titania concentration leading to enhanced defects induced structures. This is further supported by Raman spectroscopic analysis which exhibit rise of ID/IG from 0.76 to 0.82 for 0.5% to 5% titania respectively. These structural defects appear due to sp2 disrupted domains and serve as anchoring sites for the functional groups such as C=O, C-O, C-H and C=C as evidenced by FTIR findings. Furthermore, titania induces synergistic effect and promotes redshift absorption of CNOs, leading to widening its band gap from 1.55 eV to 2.04 eV. This visible light driven CNO composites can act as photocatalyst for different photocatalytic and photochemical applications.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145252060","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":"Metallic superhydrophobic nanostructures via bottom-up synthesis: design, functionality, and applications.","authors":"Maciej Psarski","doi":"10.1088/1361-6528/ae09b4","DOIUrl":"10.1088/1361-6528/ae09b4","url":null,"abstract":"<p><p>Superhydrophobic metallic nanostructures fabricated via bottom-up synthesis methods offer a versatile platform for advanced surface engineering, combining extreme water repellency with the inherent electrical, thermal, and mechanical advantages of pure metals. Techniques such as electrochemical deposition, polyol reduction, and galvanic replacement enable precise control over hierarchical morphologies-including nanowires, nanocones, and dendritic arrays-critical for stabilizing the Cassie-Baxter wetting state. Pure metals such as silver, copper, nickel, and aluminum provide distinct benefits, including high conductivity, mechanical robustness, plasmonic activity, and antimicrobial properties, which are directly exploitable without the complexity of composite systems. These nanostructures exhibit multifunctionality, enabling applications such as self-cleaning surfaces, electrothermal and photothermal anti-icing, oil-water separation, electromagnetic interference shielding, and wearable electronics. However, challenges remain in scaling production, minimizing the environmental impact of fabrication processes, and ensuring long-term durability under mechanical stress. Addressing these limitations will be pivotal for translating metallic superhydrophobic nanostructures into sustainable, real-world solutions across aerospace, biomedical, and environmental sectors.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145125352","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":"Strain direction dependent optical bandgap modulation and negative Poisson's ratio in layered violet phosphorus.","authors":"Yuqing Liu, Shuaihao Tang, Weiheng Zhong, Wei Xin, Jiawei Jing, Yimeng Shi, Xingang Zhao, Yuanzheng Li, Weizhen Liu","doi":"10.1088/1361-6528/ae0ad9","DOIUrl":"10.1088/1361-6528/ae0ad9","url":null,"abstract":"<p><p>Two-dimensional layered materials, especially structures with a negative Poisson's ratio (NPR), provide an ideal platform for engineering optical properties through strain control because of their extremely high mechanical elasticity and sensitive dependence of material properties on mechanical strain. Violet phosphorus (VP) exhibits intrinsic NPR and anisotropic optical properties arising from its unique crystalline structure, which is suitable for strain monitoring applications via photoluminescence (PL) spectroscopy. In this paper, a combined experimental and theoretical effort is made to investigate the effects of mechanical strain along different crystallographic orientations on various spectral features of VP PL. It is found that VP exhibits anomalous strain-dependent bandgap increase, showing anisotropic modulation rates of +16.60 meV/% (<b><i>a</i></b>-axis) and +10.87 meV/% (<b><i>b</i></b>-axis). The abnormal phenomenon could be correlated with electronic band structure based on first-principles calculations. The bandgap increase results from reduced conduction band wavefunctions with the increase of strain. More importantly, the NPR of VP under strain increases its average interlayer spacing, where reduced interlayer interactions drive the monotonic optical bandgap modulation. These findings provide essential insights into the strain-induced optical tunability of VP nanosheets, paving the way for advanced photonic and optoelectronic applications.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145138024","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":"Optimization of MEMS Sensors with 2D Materials: Graphene-Induced Nonradiative Transitions and Suspended Proof Mass Structures.","authors":"Jiaqing Lv, Chunyu Li, Linfu Li, Qiu Cai, Chengwei Zhang, Jiang Tao Liu","doi":"10.1088/1361-6528/ae103e","DOIUrl":"https://doi.org/10.1088/1361-6528/ae103e","url":null,"abstract":"<p><p>Force and acceleration sensors based on graphene-induced nonradiative transitions and silicon proof mass structures, supported by various two-dimensional material cantilevers, are investigated. The results show that hexagonal boron nitride, due to its low Young's modulus and ultrathin thickness, offers superior deformability, thereby enhancing the performance of the microelectromechanical systems (MEMS) sensor. Additionally, the extreme sensitivity of graphene-induced nonradiative transitions to distance allows the sensor to maintain high performance while minimizing its overall dimensions. In force sensing applications, the device achieves a measurement range of 0-400 pN with a sensitivity of 0.50 %/pN. For acceleration sensing, it exhibits a measurement range of 0-6 g, with an accelerometer sensitivity of 17.24 %/g. This work not only demonstrates the feasibility of integrating two-dimensional materials with MEMS, but also establishes a technical foundation for the development of multifunctional MEMS sensors designed for the Internet of Things and implantable medical devices.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145244843","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}