Nanotechnology最新文献

{"title":"Colloidal quantum dots as solution-based nanomaterials for infrared technologies.","authors":"Seçil Sevim Ünlütürk, Didem Taşcıoğlu, Serdar Özçelik","doi":"10.1088/1361-6528/ad9b32","DOIUrl":"10.1088/1361-6528/ad9b32","url":null,"abstract":"<p><p>This review focuses on recent progress of wet-chemistry-based synthesis methods for infrared (IR) colloidal quantum dots (CQD), semiconductor nanocrystals with a narrow energy bandgap that absorbs and/or emits IR photos covering from 0.7 to 25 micrometers. The sections of the review are colloidal synthesis, precursor reactivity, cation exchange, doping and de-doping, surface passivation and ligand exchange, intraband transitions, quenching and purification, and future directions. The colloidal synthesis section is organized based on precursors employed: toxic substances as mercury- and lead-based metals and non-toxic substances as indium- and silver-based metal precursors. CQDs are prepared by wet-chemical methods that offer advantages such as precise spectral tunability by adjusting particle size or particle composition, easy fabrication and integration of solution-based CQDs (as inks) with complementary metal-oxide-semiconductors, reduced cost of material manufacturing, and good performances of IR CQD-made optoelectronic devices for non-military applications. These advantages may allow facile and materials' cost-reduced device fabrications that make CQD based IR technologies accessible compared to optoelectronic devices utilizing epitaxially grown semiconductors. However, precursor libraries should be advanced to improve colloidal IR quantum dot synthesis, enabling CQD based IR technologies available to consumer electronics. As the attention of academia and industry to CQDs continue to proliferate, the progress of precursor chemistry for IR CQDs could be rapid.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789509","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 ethylenediamine detection using WO3-BiVO4 nanoflakes heterostructure with exceptional adsorption capabilities: Experimental and theoretical studies.","authors":"Eun-Bi Kim, M Shaheer Akhtar, Sadia Ameen, Ahmad Umar, Sheikh A Akbar, Sotirios Baskoutas","doi":"10.1088/1361-6528/ada038","DOIUrl":"https://doi.org/10.1088/1361-6528/ada038","url":null,"abstract":"<p><p>The present work describes the synthesis of WO3-BiVO4- nanoflakes heterostructure (NFHs) by a single step hydrothermal method. The analysis of crystalline phases and structural behavior deduced the formation of good crystal quality WO3-BiVO4 NFHs. Under microscopic observation, the as-prepared WO3-BiVO4 displayed uniform and conspicuous nanoflakes like structures. The extensive density functional theory (DFT) was studied to examine the electronic and band structures of as-prepared WO3-BiVO4 NFHs in terms of formation energy, charge density, density of state (DOS) and band structures. The synthesized WO3-BiVO4 NFHs was used as sensing electrode towards the detection of ethylenediamine (EDA) chemical that displayed a good sensitivity of ~318.52 mA.mM-1cm-2, excellent dynamic range of 1 μM - 1 mM with detection limit (LOD) of ~94.51 nM and retention coefficient of ~0.9929. WO3-BiVO4 NFHs electrode possessed the good reproducibility, stability, and repeatability towards EDA chemical. To the best of our knowledge, for the first time, the fabricated chemical sensor fabricated with WO3-BiVO4 NFHs electrode could be promising electrode materials to identify dangerous chemicals at very low concentration in environment. Importantly, the fabricated chemical sensor can be effective for environmental monitoring.&#xD;&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142847129","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":"Corrigendum:<i>In vivo</i>detection of magnetic labeled oxidized multi-walled carbon nanotubes by magnetic resonance imaging (2014<i>Nanotechnology</i> 25 495102).","authors":"Ruibin Li, Ren'an Wu, Liang Zhao, Hongqiang Qin, Jianlin Wu, Jingwen Zhang, Ruyi Bao","doi":"10.1088/1361-6528/ad9b31","DOIUrl":"https://doi.org/10.1088/1361-6528/ad9b31","url":null,"abstract":"","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":"36 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142854077","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 paradigm of microbe-mediated green nano-semiconductors and nano-metals.","authors":"Ajit Khosla, Vishal Chaudhary, Hui Zhang","doi":"10.1088/1361-6528/ad9aaf","DOIUrl":"10.1088/1361-6528/ad9aaf","url":null,"abstract":"<p><p>Semiconducting and metallic nanomaterials are essential building blocks for developing modern-age technologies, and their demand is expanding exponentially with a growing population. However, their processing impacts the ecosystem and requires urgently sustainable solutions. This perspective underlines the emergence of microbe-mediated (bacteria, yeast, fungi, microalgae, viruses, cyanobacteria) green nanomaterials, including metal-based, carbon-based, organic and hybrid nanomaterials, with technical challenges of scalability, stability and cytotoxicity restricting their transition from lab-to-market. Besides, it discusses alternative solutions by integrating digital-age technologies like artificial intelligence to establish these green nano-semiconductors/metals for multidimensional applications and subsidizing the UN's sustainable development goals and one health management.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142786150","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":"Nanostructured zinc carbonate hydroxide microflakes: assessing the toxicity against erythrocytes and L929 cells<i>in vitro</i>.","authors":"Volodymyr Prokopiuk, Anatolii Onishchenko, Yuliia Pazura, Iryna Bespalova, Umut Kökbaş, Liliya Tryfonyuk, Pavlo Mateychenko, Kateryna Kot, Saulesh Kurmangaliyeva, Yurii Kot, Svetlana Yefimova, Anton Tkachenko","doi":"10.1088/1361-6528/ad9aac","DOIUrl":"10.1088/1361-6528/ad9aac","url":null,"abstract":"<p><p>Nanostructured materials have been suggested to be used as a source of dietary zinc for livestock animals. In this study, we assessed the cytotoxicity of newly synthesized nanostructured zinc carbonate hydroxide (ZnCH) Zn₅(CO₃)(OH)₆microflakes. Cytotoxicity of the microflakes was assessed against murine L929 cell line and rat mature erythrocytes. Viability, motility, cell death pathways, implication of Ca²⁺, reactive oxygen species and reactive nitrogen species (RNS) signaling, caspases, and alterations of cell membranes following exposure of L929 cells to the microflakes were assessed. To assess hemocompatibility of the Zn-containing microflakes, osmotic fragility and hemolysis assays were performed, as well as multiple eryptosis parameters were evaluated. Our findings indicate a dose-response cytotoxicity of ZnCH microflakes against L929 cells with no toxicity observed for low concentrations (10 mg l^-1and below). At high concentrations (25 mg l^-1and above), ZnCH microflakes promoted nitrosyl stress, Ca²⁺- and caspase-dependent apoptosis, and altered lipid order of cell membranes in a dose-dependent manner, evidenced by up to 7-fold elevation of RNS-dependent fluorescence, 2.9-fold enhancement of Fura 2-dependent fluorescence, over 20-fold elevation of caspases-dependent fluorescence (caspase-3, caspase-8, and caspase-9), and up to 4.4-fold increase in the ratiometric index of the NR12S probe. Surprisingly, toxicity to enucleated mature erythrocytes was found to be lower compared to L929 cells. ZnCH microflakes induced eryptosis associated with oxidative stress, nitrosyl stress, Ca²⁺signaling and recruitment of caspases at 25-50-100 mg l^-1. Eryptosis assays were found to be more sensitive than evaluation of hemolysis. Zn₅(CO₃)(OH)₆microflakes show no cytotoxicity at low concentrations indicating their potential as a source of zinc for livestock animals.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142786182","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":"Dexamethasone-loaded fibroin nanoparticles promote retinal reattachment in rats by regulating the Th17/Treg balance.","authors":"Linfeng Han, Xiaomeng Li, Genjie Ke, Kai Dong, Guoping Wang, Yonghong Sheng, Liming Tao","doi":"10.1088/1361-6528/ad9df2","DOIUrl":"https://doi.org/10.1088/1361-6528/ad9df2","url":null,"abstract":"<p><p>Purpose&#xD;Retinal detachment (RD) is a common acute blinding eye disease. DEX, an adrenocorticosteroid drug, has predominant protective effects on RD. However, given its poor water solubility and low bioavailability, we aimed to develop an alternative nano-based treatment approach to investigate the effects and underlying mechanisms of RD.&#xD;Methods&#xD;SF@DEX nanomaterials were synthesized and then successfully characterized. In vitro, phagocytosis was measured by flow cytometry. The expression levels of IL-17 and IL-10 were determined by ELISA. A rat model of RD was established by surgery. Then, rats were orally administered with SF, SF@DEX, and DEX, respectively. The level of IL-17A and FOXP3 was assessed by PCR, and the expression levels of TGF-β1, IL-10, IL-17A, and FOXP3 were detected by Western blot. The apoptotic level of retinal ganglion cells (RGCs) in retinal tissue was measured by TUNEL assay, and confocal microscopy was used to detect changes in the colocalization content of IL-17A and FOXP3 in retinal tissue.&#xD;Results&#xD;Our results demonstrated that the nanoparticles exhibited good stability. The encapsulation efficiency (EE) was 90%, and approximately 60% of DEX was released within 12 hours from the dialysis bag. In vivo, after treatment with SF@DEX, the expression of Th17 cells and IL-17A significantly decreased, while the expression levels of Tregs, FOXP3, TGF-β1, and IL-10 were increased. Furthermore, SF@DEX nanomaterial treatment markedly alleviated the severity of RD in rats.&#xD;Conclusion&#xD;Taken together, these findings demonstrate that SF@DEX can protect against RD and inhibit inflammation, mediated by regulating the Th17/Treg immune balance.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818778","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":"Air-stable, aluminium oxide encapsulated graphene phototransistors.","authors":"Tomás Rojas Castiglione, Thomas Pucher, Kaj Dockx, Guillermo Aburto Contreras, Diego Sanz Biava, Benjamín Briceño Elchiver, Michele Buscema, Andres Castellanos-Gomez, Herre S J van der Zant, Diana Dulić","doi":"10.1088/1361-6528/ad9df0","DOIUrl":"https://doi.org/10.1088/1361-6528/ad9df0","url":null,"abstract":"<p><p>Graphene has garnered significant interest in optoelectronics due to its unique properties, including broad wavelength absorption and high mobility. However, its weak stability in ambient conditions requires encapsulation for practical applications. In this study, we investigate graphene CVD-grown field-effect transistors fabricated on Si/SiO₂wafers, encapsulated with aluminum oxide (Al₂O₃) of different thicknesses. We measure and analyze their optoelectronic response across wavelengths from near-ultraviolet to near-infrared. We find that, while having a negligible role in the photogating process, the Al₂O₃layer leads to stable and reproducible transferring curves operating in ambient conditions for over a month, with stable responsivities up to 1.5 A/W at the shortest wavelength. Moreover, the transferring curves are stable at elevated temperatures up to 107 °C. We also show that the sample performance can be tuned by changing the thickness of the Si/SiO₂and Al₂O₃layer which brings further perspectives in developing robust sample technologies, especially in the ultraviolet region where the responsivity increases. Aluminum oxide encapsulated graphene-based photodetectors can thus be interesting for applications in air and at elevated temperatures.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818776","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":"Understanding the electric field dependent channel migration for shorter channel length of multilayer rhenium disulfide (ReS₂) FETs.","authors":"Hyeong Jin Choi, Yun Jae Choi, Gyu-Tae Kim","doi":"10.1088/1361-6528/ad992f","DOIUrl":"10.1088/1361-6528/ad992f","url":null,"abstract":"<p><p>Multilayer rhenium disulfide (ReS₂) has attracted considerable attention due to the decoupled van der Waals interaction between its adjacent layers, leading to significantly higher interlayer resistance compared with other layered materials. While the carrier transport in multilayer materials can be well described by the interlayer resistance (<i>R</i>_Int) and Thomas-Fermi charge screening length (λTF) in resistor network models, the electric field scaling of the channel with the back gate voltage (<i>V</i>_BG) and the drain voltage (<i>V</i>_D) is limited in two-dimensional (2D) multilayer materials. In this report, we present the effects of<i>V</i>_BGand<i>V</i>_Don the channel migration of ReS₂field effect transistors (FETs) with channel lengths of 0.25, 2.4, and 4.4<i>μ</i>m. For shorter channels, the<i>V</i>_BG-dependent conductance (<i>G</i>= (drain current (<i>I</i>_D)/<i>V</i>_D)) increases with increasing<i>V</i>_D, different from the longer channels. Based on the resistor network model, the different behaviors with channel lengths were analyzed by considering the interlayer resistance (<i>R</i>_Int) versus the channel resistance and the Thomas-Fermi charge screening length (λTF). Lower back gate voltage (<i>V</i>_BG) in shorter channels builds the channel near the bottom layer close to the oxide, while high<i>V</i>_BGshifts the conductive channel to the top sheet exposed to ambient condition. In longer channels, due to the increased channel resistance (<i>R</i>_ch), the conductive channel forms near the bottom side close to the oxide. The increase of the threshold voltage (<i>V</i>_th) was observed at higher drain-source voltages (<i>V</i>_D), but in opposite for the top side channel, i.e. the decrease of threshold voltage with increasing<i>V</i>_D. This study will give a hint on establishing the electric field scaling of 2D material-based FETs with channel lengths and applied voltages of<i>V</i>_BGand<i>V</i>_D.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770692","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":"Tuning specific absorption rate of Mn ferrite nanoparticles synthesized by a thermal decomposition method with different Mn concentrations.","authors":"Sahar Oroujizad, Mohammad Almasi Kashi, Amir H Montazer","doi":"10.1088/1361-6528/ad9def","DOIUrl":"https://doi.org/10.1088/1361-6528/ad9def","url":null,"abstract":"<p><p>A thermal decomposition method is used to synthesize monodisperse Mn ferrite nanoparticles (NPs) by changing Mn concentration from 0.1 to 0.8 mmol. The effects of Mn concentration on structural, compositional, morphological, magnetic, and hyperthermia properties are investigated. Transmission electron microscopic images show that the morphology of the NPs changes from flower-like to polygonal with increasing the Mn concentration. The saturation magnetization reaches a maximum value of 48.32 emu/g and a minimum value of 11.09 emu/g with changing the Mn concentration, whereas the coercivity value decreases from 12.6 to 5.3 Oe. The first-order reversal curve (FORC) analysis enables the estimation of superparamagnetic contribution of the Mn ferrite NPs in the range of 21-59.5%. The highest specific absorption rate (SAR) value is obtained to be 385.37 W/g for Mn0.1Fe2.9O4 NPs with the maximum superparamagnetic contribution using a manganese concentration of 0.4 mmol.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818788","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":"Synthesis and magnetic properties of NiCo₂O₄urchin-like nanofibers.","authors":"Ahmed M Nashaat, Abdulaziz Abu El-Fadl, Hiroyuki Nakamura, Mohamed A Kassem","doi":"10.1088/1361-6528/ad947f","DOIUrl":"10.1088/1361-6528/ad947f","url":null,"abstract":"<p><p>Single-phase NiCo₂O₄(NCO) nanoparticles (NPs) with an average particle size of 12 (±3.5) nm were successfully synthesized as aggregates in urchin-like nanofibers via a hydrothermal route. Magnetization data measured as functions of temperature and magnetic field suggest a superparamagnetic-like behavior at room temperature, a ferrimagnetic transition around a Curie temperature<i>T</i>_C∼ 200 K, and a spin blocking transition at a blocking temperature<i>T</i>_B∼ 90 K, as observed at a field of 100 Oe. The spin blocking nature has been investigated by analyses of the field-dependence of<i>T</i>_Bin the static magnetization and its frequency-dependence in the ac susceptibility data measured in zero-field cooling regime, both indicate a low-temperature spin glass-like state. Below<i>T</i>_B, the coercivity increases monotonically up to 1.7 kOe with decreasing temperature down to 5 K. Our results indicate that the magnetic behavior of NCO NPs, which is mainly determined by the cations' ratio, oxidation states, and site-occupancy, can be controlled by a synthesis in appropriate particle size and morphology.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142682443","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}