Nanoscale Advances最新文献

{"title":"Effect of solvothermal synthesis parameters on crystallite size and atomic structure of cobalt iron oxide nanoparticles","authors":"Olivia Aalling-Frederiksen, Rebecca Katharina Pittkowski, Andy Sode Anker, Jonathan Quinson, Lars Klemeyer, Ben Frandsen, Dorota Koziej, Kirsten Marie Ørnsbjerg Jensen","doi":"10.1039/d4na00590b","DOIUrl":"https://doi.org/10.1039/d4na00590b","url":null,"abstract":"We investigate how synthesis method affect the crystallite size and atomic structure of cobalt iron oxide nanoparticles. By using a simple solvothermal method, we first synthesize cobalt ferrite nanoparticles of ca. 2 and 7 nm, characterized by Transmission Electron Microscopy (TEM), Small Angle X-ray scattering (SAXS), X-ray and neutron total scattering. The smallest particle size corresponds to only a few spinel unit cells, nevertheless, Pair Distribution Function (PDF) analysis of X-ray and neutron total scattering data show that the atomic structure in even the smallest nanoparticles is well described by the spinel structure, however with significant disorder and a contraction of the unit cell parameter. These effects can be explained by surface oxidation of the small nanoparticles, which is confirmed by X-ray near edge absorption spectroscopy (XANES). Neutron total scattering data and PDF analysis reveal a larger degree of inversion of the spinel of the smallest nanoparticles. Neutron total scattering data furthermore allows magnetic PDF (mPDF) analysis, which show that the ferrimagnetic domains correspond to ca. 80% of the crystallite size in the larger particles. A similar but less well-defined magnetic ordering was observed for the smallest nanoparticles. Finally, we use a co-precipitation synthesis method at room temperature to synthesize ferrite nanoparticles of similar size as the smallest crystallites synthesized by the solvothermal method. Structural analysis with PDF demonstrates that the ferrite nanoparticles synthesized via this method exhibit a significantly more defective structure compared to those synthesized via a solvothermal method.","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142264380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 bactericidal behavior of silver nanoparticles decorated nano-sized magnetic hydroxyapatite","authors":"Ebrahim Sadeghi, Reza Taghavi, Amir Hasanzadeh, Sadegh Rostamnia","doi":"10.1039/d4na00183d","DOIUrl":"https://doi.org/10.1039/d4na00183d","url":null,"abstract":"Methicillin-resistant Staphylococcus aureus (MRSA) is the most common cause of acute bacterial arthritis. Due to the increase in antibiotic resistance in these bacteria, the discovery of new antibacterial agents became one of the hot topics in the scientific community. Here, we prepared a nano-sized porous biocompatible magnetic hydroxyapatite through a solvothermal method. Then, we hired a post-synthesis modification strategy to modify its surface for the stabilization of the Ag NPs through a green reduction by the euphorbia plant extract. Moreover, the results show that the prepared composite perfectly prevents the aggregation of the Ag NPs. This composite was used as a bactericidal and antibiofilm agent against MRSA bacteria in an in vitro environment, which showed excellent results. Also, the cell viability assay indicates that the prepared composite has low cytotoxicity, making it a perfect antibacterial agent for in vivo experiments.","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142264382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermomechanical properties of confined magnetic nanoparticles in electrospun polyacrylonitrile nanofiber matrix exposed to a magnetic environment: Structure, Morphology, and Stabilization (Cyclization)","authors":"Baran Sarac, Viktor Soprunyuk, Gordon Herwig, Selin Gumrukcu, Ekrem Kaplan, Eray Yüce, Wilfried Schranz, Jürgen Eckert, Luciano Boesel, A. Sezai Sarac","doi":"10.1039/d4na00631c","DOIUrl":"https://doi.org/10.1039/d4na00631c","url":null,"abstract":"Electrospun metal oxide-polymer nanofiber composites hold promise for revolutionizing biomedical applications due to their unique combination of electronic and material properties and tailorable functionalities. An investigation into incorporating Fe-based nanofillers for optimizing the polyacrylonitrile matrix was conducted, where the systematic and organized arrangement of inorganic components was achieved through non-covalent bonding. These carefully dispersed nanomaterials exhibit the intrinsic electronic characteristics of the polymers and concurrently respond to external magnetic fields. Electrospinning was utilized to fabricate polyacrylonitrile nanofibers blended with Fe2O3 and MnZn Ferrite nanoparticles, which were thermomechanically, morphologically, and spectroscopically characterized in detail. With the application of an external magnetic field in the course of dynamic mechanical measurements under tension, the storage modulus of the glass transition Tg of PAN/Fe2O3 rises at the expense of the loss modulus, and a new peak emerges at ~350 K. For the PAN/MnZn Ferrite nanofibers a relatively larger shift in Tg (from ~367 K to ~377 K) is observed, emphasizing that in comparison to Fe2O3, Mn²⁺ ions in particular enhance the material’s magnetic response in MnZn Ferrite. The magnetic oxide particles are homogenously dispersed in polyacrylonitrile, corroborated by high-resolution scanning electron microscopy. Both nanopowder additions lead to a slight shift of the peak towards larger angles, related to the shrinkage of the polymer. Produced nanofibers with high mechanical and heating efficiency can optimize the influence of the intracellular environment, magnetic refrigeration systems and sensors/actuators by their magnetic behavior and heat generation.","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142264381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"l-cysteine capped MoS2 QDs for dual-channel imaging and superior Fe3+ ion sensing in biological systems†","authors":"Vishakha Takhar, Simranjit Singh, Superb K. Misra and Rupak Banerjee","doi":"10.1039/D4NA00505H","DOIUrl":"10.1039/D4NA00505H","url":null,"abstract":"<p >MoS<small>₂</small> quantum dots (MQDs) with an average size of 1.9 ± 0.7 nm were synthesized using a microwave-assisted method. Absorbance studies confirmed characteristic transitions of MoS<small>₂</small>, with absorption humps at 260–280 nm and 300–330 nm, and a band gap of 3.6 ± 0.1 eV. Fluorescence emission studies showed dominant blue and some green emissions under 315 nm excitation, with an absolute quantum yield of ∼9%. The MQDs exhibited fluorescence stability over time after repeated quenching cycles across various pH and media systems. <em>In vitro</em> toxicity tests indicated cytocompatibility, with around 80% cell survival at 1000 mg L<small>⁻¹</small>. Confocal imaging demonstrated significant uptake and vibrant fluorescence in cancerous and non-cancerous cell lines. The MQDs showed strong selectivity towards Fe<small>³⁺</small> ions, with a detection limit of 27.61 ± 0.25 nM. Recovery rates for Fe<small>³⁺</small> in phosphate buffer saline (PBS) and simulated body fluid (SBF) systems were &gt;97% and &gt;98%, respectively, with a relative standard deviation (RSD) within 3%, indicating precision. These findings suggest that MQDs have high potential for diagnostic applications involving Fe<small>³⁺</small> detection due to their fluorescence stability, robustness, enhanced cell viability, and dual-channel imaging properties.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/na/d4na00505h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A catalytic amplification platform based on Fe2O3 nanoparticles decorated graphene nanocomposites for highly sensitive detection of rutin†","authors":"Zhuzhen Chen, Tingting Zhang, Xue Zhang, Wangxing Cheng, Linwei Chen and Nannan Lu","doi":"10.1039/D4NA00583J","DOIUrl":"10.1039/D4NA00583J","url":null,"abstract":"<p >Exploration of nanocomposites with exceptional catalytic activities is essential for harnessing the unique advantages of each constituent in the domains of pharmaceutical analysis and electrochemical sensing. In this regard, we illustrated the synthesis of iron oxide/N-doped reduced graphene oxide (Fe<small>₂</small>O<small>₃</small>/N-rGO) nanocomposites through a one-step thermal treatment of iron phthalocyanine (FePc), melamine, and graphene oxide for electrochemical sensing. The large specific surface area and good conductivity of N-rGO can efficiently capture rutin molecules and accelerate electron transport, thereby improving the electrochemical performance. Moreover, the Fe<small>₂</small>O<small>₃</small> nanoparticles with distinct electronic characteristics significantly enhanced the detection sensitivity of the constructed electrochemical platform. Because of the outstanding electrical conductivity, an extensive surface area, and synergistic catalysis, Fe<small>₂</small>O<small>₃</small>/N-rGO was employed as an advanced electrode modifier to build an electrochemical sensing platform for rutin detection. Significantly, the manufactured sensor showed a broad detection range from 7 nM to 150 μM and a high sensitivity of 5632 μA mM<small>⁻¹</small>. Furthermore, the fabricated sensor showed desirable results in terms of stability, selectivity, and practical application. This work presents a facile method to prepare Fe<small>₂</small>O<small>₃</small>/N-rGO and supplies a valuable example for building metal oxide/graphene nanocomposites for electrochemical analysis.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/na/d4na00583j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NIR-triggered photooxygenation of α-terpinene with upconversion nanohybrids","authors":"María González-Béjar, Laura Frances-Soriano, Delia Bellezza, Juan Ferrera-González, Julia Perez-Prieto","doi":"10.1039/d4na00528g","DOIUrl":"https://doi.org/10.1039/d4na00528g","url":null,"abstract":"Upconversion nanohybrids (UCNHs) consisting of rose bengal (RB) and upconversion nanoparticles (UCNPs) are able to promote terpinene oxidation upon near-infrared irradiation. The photophysical events occurring upon NIR-irradiation of the UCNH correlate well with the synthetic protocol used to prepare the UCNHs (RB loading and aggregation). These results highlight the importance of the optimization of UCNHs composition for the photocatalysis outcome.","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 systematic study of TMOn (TM = V, Cr, Mn, and Fe; n = 3 and 6) clusters embedded in a PtS2 monolayer†","authors":"Nguyen Thanh Tien, J. Guerrero-Sanchez and D. M. Hoat","doi":"10.1039/D4NA00465E","DOIUrl":"10.1039/D4NA00465E","url":null,"abstract":"<p >Doping-based magnetism engineering is an effective approach to synthesize new multifunctional two-dimensional (2D) materials from their non-magnetic counterparts. In this work, doping with TMO<small>_<em>n</em></small> clusters (TM = V, Cr, Mn, and Fe; <em>n</em> = 3 and 6) is proposed to induce feature-rich electronic and magnetic properties in a PtS<small>₂</small> monolayer. The pristine monolayer is a non-magnetic semiconductor with an indirect energy gap of 1.81 (2.67) eV as obtained from PBE(HSE06)-based calculations. PtS<small>₃</small>-type multivacancies magnetize significantly the monolayer, inducing the emergence of half-metallicity. In this case, a total magnetic moment of 1.90 μ<small>_B</small> is obtained and magnetic properties are produced mainly by atoms around the vacancy sites. Meanwhile, the PtS<small>₂</small> monolayer is metallized by creating PtS<small>₆</small>-type multivacancies without magnetization. Depending on the type of TMO<small>_<em>n</em></small> cluster, either a feature-rich diluted magnetic semiconductor or half-metallic nature is induced, which is regulated mainly by the incorporated clusters. Except for the FeO<small>₆</small> cluster, TM atoms and O atoms exhibit an antiparallel spin orientation, resulting in total magnetic moments between 1.00 and 4.00 μ<small>_B</small>. Meanwhile, the parallel spin ordering gives a large total magnetic moment of 5.99 μ<small>_B</small> for the FeO<small>₆</small>-doped monolayer. Furthermore, Bader charge analysis indicates that all the clusters attract charge from the host monolayer that is mainly due to the electronegative O atoms. Our results may introduce cluster doping as an efficient way to create new spintronic 2D materials from a non-magnetic PtS<small>₂</small> monolayer.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/na/d4na00465e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of plasmonic lens structure for maximum optical vortices induced on Weyl Semimetals Surface States","authors":"Ritwik Banerjee, Tanmoy Maiti","doi":"10.1039/d4na00336e","DOIUrl":"https://doi.org/10.1039/d4na00336e","url":null,"abstract":"Optical vortices have a topologically charged phase singularity, as well as zero intensity distribution in the centre. Optical vortex creation is regarded as a significant source for information transmission for applications in quantum computing, encryption, optical communication, etc. In the present work, using Finite Difference Time Domain (FDTD) simulation we have calculated electric field intensity and phase distribution of 2D lattice of optical vortices generated from various polygonal plasmonic lens structures using surface states of Weyl semimetal (MoTe2). It has been shown that hexagonal lens is the best performing plasmonic lens. Further we have posited here a unified mathematical formulation for the optical electrical field and phase distribution in the near field for any polygonal plasmonic lens. Our theoretical calculation corroborates well with the FDTD results validating the proposed generalized formula. Such plasmonic lens structures demonstrating scaling behavior offer great potential for designing next generation optical memories.","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An overview of critical applications of resistive random access memory","authors":"Furqan Zahoor, Arshid Nisar, Usman Isyaku Bature, Haider Abbas, Faisal Bashir, Anupam Chattopadhyay, Brajesh Kumar Kaushik, Ali Alzahrani and Fawnizu Azmadi Hussin","doi":"10.1039/D4NA00158C","DOIUrl":"10.1039/D4NA00158C","url":null,"abstract":"<p >The rapid advancement of new technologies has resulted in a surge of data, while conventional computers are nearing their computational limits. The prevalent von Neumann architecture, where processing and storage units operate independently, faces challenges such as data migration through buses, leading to decreased computing speed and increased energy loss. Ongoing research aims to enhance computing capabilities through the development of innovative chips and the adoption of new system architectures. One noteworthy advancement is Resistive Random Access Memory (RRAM), an emerging memory technology. RRAM can alter its resistance through electrical signals at both ends, retaining its state even after power-down. This technology holds promise in various areas, including logic computing, neural networks, brain-like computing, and integrated technologies combining sensing, storage, and computing. These cutting-edge technologies offer the potential to overcome the performance limitations of traditional architectures, significantly boosting computing power. This discussion explores the physical mechanisms, device structure, performance characteristics, and applications of RRAM devices. Additionally, we delve into the potential future adoption of these technologies at an industrial scale, along with prospects and upcoming research directions.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/na/d4na00158c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding mono- and bi-metallic Au and Ni nanoparticle responses to fast heating†","authors":"Tatiana E. Itina","doi":"10.1039/D4NA00634H","DOIUrl":"10.1039/D4NA00634H","url":null,"abstract":"<p >Nanoparticle assembly, alloying and fragmentation are fundamental processes with significant implications in various fields such as catalysis, materials science, and nanotechnology. Understanding these processes under fast heating conditions is crucial for tailoring nanoparticle properties and optimizing their applications. For this, we employ molecular dynamics simulations to obtain atomic-level insights into nanoparticle behavior. The performed simulations reveal intricate details of sintering, alloying and fragmentation mechanisms shedding light on the underlying physical phenomena governing these processes. The calculation results help to visualize nanoparticle evolution upon undercritical and supercritical heating elucidating not only the role of temperature, but also of nanoparticle sizes and composition. In particular, it is shown that surface tension and surface energy play important roles not only in nanoparticle melting but also in its fragmentation. When the added energy exceeds a critical threshold, the nanoparticle begins to experience alternating compression and expansion. If the tensile stress surpasses the material's strength limit, fragmentation becomes prominent. For very small particles (with radius smaller than ∼10 nm), this occurs more rapidly, whereas sub-nano-cavitation precedes the final fragmentation in larger particles, which behave more like droplets. Interestingly, this effect depends on composition in the case of AuNi alloy nanoparticles, as expected from the phase diagrams and excess energy. The heating level required to overcome the mixing barrier is also determined and is shown to play an important role in the evolution of AuNi nanoparticles, in addition to their size. Furthermore, our findings provide insights into controlling nanoparticle synthesis for various applications in numerous nanotechnological domains, such as catalysis, sensors, material analysis, as well as deseas diagnostics and treatment. This study bridges the gap between experimental observations and theoretical predictions paving the way for designing advanced nanomaterials with enhanced functionalities.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/na/d4na00634h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}