Nanomaterials最新文献

{"title":"Optical Fiber Probe with Integrated Micro-Optical Filter for Raman and Surface-Enhanced Raman Scattering Sensing.","authors":"Md Abdullah Al Mamun, Tomas Katkus, Anita Mahadevan-Jansen, Saulius Juodkazis, Paul R Stoddart","doi":"10.3390/nano14161345","DOIUrl":"10.3390/nano14161345","url":null,"abstract":"<p><p>Optical fiber Raman and surface-enhanced Raman scattering (SERS) probes hold great promise for in vivo biosensing and in situ monitoring of hostile environments. However, the silica Raman scattering background generated within the optical fiber increases in proportion to the length of the fiber, and it can swamp the signal from the target analyte. While filtering can be applied at the distal end of the fiber, the use of bulk optical elements has limited probe miniaturization to a diameter of 600 µm, which in turn limits the potential applications. To overcome this limitation, femtosecond laser micromachining was used to fabricate a prototype micro-optical filter, which was directly integrated on the tip of a 125 µm diameter double-clad fiber (DCF) probe. The outer surface of the microfilter was further modified with a nanostructured, SERS-active, plasmonic film that was used to demonstrate proof-of-concept performance with thiophenol as a test analyte. With further optimization of the associated spectroscopic system, this ultra-compact microprobe shows great promise for Raman and SERS optical fiber sensing.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357131/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080942","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":"Hybrid Cellulosic Substrates Impregnated with Meta-PBI-Stabilized Carbon Nanotubes/Plant Extract-Synthesized Zinc Oxide-Antibacterial and Photocatalytic Dye Degradation Study.","authors":"Hristo Penchev, Katerina Zaharieva, Silvia Dimova, Georgy Grancharov, Petar D Petrov, Maria Shipochka, Ognian Dimitrov, Irina Lazarkevich, Stephan Engibarov, Rumyana Eneva","doi":"10.3390/nano14161346","DOIUrl":"10.3390/nano14161346","url":null,"abstract":"<p><p>Novel fibrous cellulosic substrates impregnated with meta-polybenzimidazole (PBI)-stabilized carbon nanotubes/zinc oxide with different weight content of ZnO and with the use of dimethylacetamide as dispersant media. The pristine ZnO nanoparticle powder was prepared by plant extract-mediated synthesis using <i>Vaccinium vitis-idaea</i> L. The green synthesized ZnO possesses an average crystallite size of 15 nm. The formation of agglomerates from ZnO NPs with size 250 nm-350 nm in the m-PBI@CNTs/ZnO was determined. The prepared materials were investigated by PXRD analysis, XPS, SEM, EDS, AFM, and TEM in order to establish the phase and surface composition, structure, and morphology of the hybrids. The potential of the synthesized hybrid composites to degrade methylene blue (MB) dye as a model contaminant in aqueous solutions under UV illumination was studied. The photocatalytic results show that in the course of the photocatalytic reaction, the m-PBI@CNTs/ZnO 1:3 photocatalyst leads to the highest degree of degradation of the methylene blue dye (67%) in comparison with the other two studied m-PBI@CNTs/ZnO 1:1 and 1:2 composites (48% and 41%). The antibacterial activity of ZnO nanoparticles and the hybrid CNT materials was evaluated by the RMDA and the dynamic contact method, respectively. The profound antibacterial effect of the m-PBI@CNTs/ZnO hybrids was monitored for 120 h of exposition in dark and UV illumination regimes. The photocatalytic property of ZnO nanoparticles significantly shortens the time for bactericidal action of the composites in both regimes. The m-PBI@CNTs/ZnO 1:2 combination achieved complete elimination of 5.10⁵ CFU/mL <i>E. coli</i> cells after 10 min of UV irradiation.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11356824/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080989","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":"Low-Temperature Fabrication of BiFeO₃ Films on Aluminum Foils under a N₂-Rich Atmosphere.","authors":"Jing Yan","doi":"10.3390/nano14161343","DOIUrl":"10.3390/nano14161343","url":null,"abstract":"<p><p>To be CMOS-compatible, a low preparation temperature (<500 °C) for ferroelectric films is required. In this study, BiFeO₃ films were successfully fabricated at a low annealing temperature (<450 °C) on aluminum foils by a metal-organic decomposition process. The effect of the annealing atmosphere on the performance of BiFeO₃ films was assessed at 440 ± 5 °C. By using a N₂-rich atmosphere, a large remnant polarization (<i>P_r</i>~78.1 μC/cm² @ 1165.2 kV/cm), and a high rectangularity (~91.3% @ 1165.2 kV/cm) of the <i>P-E</i> loop, excellent charge-retaining ability of up to 1.0 × 10³ s and outstanding fatigue resistance after 1.0 × 10⁹ switching cycles could be observed. By adopting a N₂-rich atmosphere and aluminum foil substrates, acceptable electrical properties (<i>P_r</i>~70 μC/cm² @ 1118.1 kV/cm) of the BiFeO₃ films were achieved at the very low annealing temperature of 365 ± 5 °C. These results offer a new approach for lowering the annealing temperature for integrated ferroelectrics in high-density FeRAM applications.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357338/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080999","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":"Interventional Effect of Zinc Oxide Nanoparticles with <i>Zea mays</i> L. Plants When Compensating Irrigation Using Saline Water.","authors":"Mostafa Ahmed, Diaa Attia Marrez, Roquia Rizk, Donia Abdul-Hamid, Zoltán Tóth, Kincső Decsi","doi":"10.3390/nano14161341","DOIUrl":"10.3390/nano14161341","url":null,"abstract":"<p><p>High salinity reduces agriculture production and quality, negatively affecting the global economy. Zinc oxide nanoparticles (ZnO-NPs) enhance plant metabolism and abiotic stress tolerance. This study investigated the effects of 2 g/L foliar Zinc oxide NPs on <i>Zea mays</i> L. plants to ameliorate 150 mM NaCl-induced salt stress. After precipitation, ZnO-NPs were examined by UV-visible spectroscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray, and particle size distribution. This study examined plant height, stem diameter (width), area of leaves, chlorophyll levels, hydrolyzable sugars, free amino acids, protein, proline, hydrogen peroxide, and malondialdehyde. Gas chromatographic analysis quantified long-chain fatty acids, and following harvest, leaves, stalks, cobs, seeds, and seeds per row were weighed. The leaves' acid and neutral detergent fibers were measured along with the seeds' starch, fat, and protein. Plant growth and chlorophyll concentration decreased under salt stress. All treatments showed significant changes in maize plant growth and development after applying zinc oxide NPs. ZnO-NPs increased chlorophyll and lowered stress. ZnO-NPs enhanced the ability of maize plants to withstand the adverse conditions of saline soils or low-quality irrigation water. This field study investigated the effect of zinc oxide nanoparticles on maize plant leaves when saline water is utilized for growth season water. This study also examined how this foliar treatment affected plant biochemistry, morphology, fatty acid synthesis, and crop production when NaCl is present and when it is not.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357163/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080996","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":"Meso-Macroporous Hydroxyapatite Powders Synthesized in Polyvinyl Alcohol or Polyvinylpyrrolidone Media.","authors":"Olga S Antonova, Margarita A Goldberg, Alexander S Fomin, Kirill A Kucheryaev, Anatoliy A Konovalov, Margarita A Sadovnikova, Fadis F Murzakhanov, Aleksey I Sitnikov, Alexander V Leonov, Nadezhda A Andreeva, Dinara R Khayrutdinova, Marat R Gafurov, Sergey M Barinov, Vladimir S Komlev","doi":"10.3390/nano14161338","DOIUrl":"10.3390/nano14161338","url":null,"abstract":"<p><p>Mesoporous hydroxyapatite (HA) is widely used in various applications, such as the biomedical field, as a catalytic, as a sensor, and many others. The aim of this work was to obtain HA powders by means of chemical precipitation in a medium containing a polymer-polyvinyl alcohol or polyvinylpyrrolidone (PVP)-with concentrations ranging from 0 to 10%. The HA powders were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, atomic emission spectroscopy with inductively coupled plasma, electron paramagnetic resonance, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The specific surface area (SSA), pore volume, and pore size distributions were determined by low-temperature nitrogen adsorption measurements, and the zeta potential was established. The formation of macropores in powder agglomerates was determined using SEM and TEM. The synthesis in 10% PVP increased the SSA from 101.3 to 158.0 m²/g, while the ripening for 7 days led to an increase from 112.3 to 195.8 m²/g, with the total pore volume rising from 0.37 to 0.71 cm³/g. These materials could be classified as meso-macroporous HA. Such materials can serve as the basis for various applications requiring improved textural properties and may lay the foundation for the creation of bulk 3D materials using a technique that allows for the preservation of their unique pore structure.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357263/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080939","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":"Carbon Dioxide Capture and Conversion Using Metal-Organic Framework (MOF) Materials: A Comprehensive Review.","authors":"Fanyi Kong, Wenqian Chen","doi":"10.3390/nano14161340","DOIUrl":"10.3390/nano14161340","url":null,"abstract":"<p><p>The escalating threat of anthropogenic climate change has spurred an urgent quest for innovative CO₂ capture and utilization (CCU) technologies. Metal-organic frameworks (MOFs) have emerged as prominent candidates in CO₂ capture and conversion due to their large specific surface area, well-defined porous structure, and tunable chemical properties. This review unveils the latest advancements in MOF-based materials specifically designed for superior CO₂ adsorption, precise separation, advanced photocatalytic and electrocatalytic CO₂ reduction, progressive CO₂ hydrogenation, and dual functionalities. We explore the strategies that enhance MOF efficiency and examine the challenges of and opportunities afforded by transitioning from laboratory research to industrial application. Looking ahead, this review offers a visionary perspective on harnessing MOFs for the sustainable capture and conversion of CO₂.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11356948/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080933","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":"Green Synthesis of Cobalt-Doped CeFe₂O₅ Nanocomposites Using Waste <i>Gossypium arboreum</i> L. Stalks and Their Application in the Removal of Toxic Water Pollutants.","authors":"Saloni Koul, Mamata Singhvi, Beom Soo Kim","doi":"10.3390/nano14161339","DOIUrl":"10.3390/nano14161339","url":null,"abstract":"<p><p>Currently, there is an increasing need to find new ways to purify water by eliminating bacterial biofilms, textile dyes, and toxic water pollutants. These contaminants pose significant risks to both human health and the environment. To address this issue, in this study, we have developed an eco-friendly approach that involves synthesizing a cobalt-doped cerium iron oxide (CCIO) nanocomposite (NC) using an aqueous extract of <i>Gossypium arboreum</i> L. stalks. The resulting nanoparticles can be used to effectively purify water and tackle the challenges associated with these harmful pollutants. Nanoparticles excel in water pollutant removal by providing a high surface area for efficient adsorption, versatile design for the simultaneous removal of multiple contaminants, catalytic properties for organic pollutant degradation, and magnetic features for easy separation, offering cost-effective and sustainable water treatment solutions. A CCIO nanocomposite was synthesized via a green co-precipitation method utilizing biomolecules and co-enzymes extracted from the aqueous solution of <i>Gossypium arboreum</i> L. stalk. This single-step synthesis process was accomplished within a 5-h reaction period. Furthermore, the synthesis of nanocomposites was confirmed by various characterization techniques such as Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), dynamic light scattering (DLS), and energy dispersive X-ray (EDX) technology. CCIO NCs were discovered to have a spherical shape and an average size of 40 nm. Based on DLS zeta potential analysis, CCIO NCs were found to be anionic. CCIO NCs also showed significant antimicrobial and antioxidant activity. Overall, considering their physical and chemical properties, the application of CCIO NCs for the adsorption of various dyes (~91%) and water pollutants (chromium = ~60%) has been considered here since they exhibit great adsorption capacity owing to their microporous structure, and represent a step forward in water purification.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357551/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080986","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":"Geometry-Tuned Optical Absorption Spectra of the Coupled Quantum Dot-Double Quantum Ring Structure.","authors":"Doina Bejan, Cristina Stan","doi":"10.3390/nano14161337","DOIUrl":"10.3390/nano14161337","url":null,"abstract":"<p><p>We investigate the energy spectra and optical absorption of a 3D quantum dot-double quantum ring structure of GaAs/Al_0.3Ga_0.7As with adjustable geometrical parameters. In the effective mass approximation, we perform 3D numerical computations using as height profile a superposition of three Gaussian functions. Independent variations of height and width of the dot and of the rings and also of the dot-rings distance determine particular responses, useful in practical applications. We consider that a suitable manipulation of the geometrical parameters of this type of quantum coupling offer a variety of responses and, more important, the possibility of a fine adjusting in energy spectra and in the opportunity of choosing definite absorption domains, properties required for the improvement of the performances of optoelectronic devices.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357507/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080984","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":"Human Serum Albumin Protein Corona in Prussian Blue Nanoparticles.","authors":"Chiara Colombi, Giacomo Dacarro, Yuri Antonio Diaz Fernandez, Angelo Taglietti, Piersandro Pallavicini, Lavinia Doveri","doi":"10.3390/nano14161336","DOIUrl":"10.3390/nano14161336","url":null,"abstract":"<p><p>Prussian Blue nanoparticles (PBnps) are now popular in nanomedicine thanks to the FDA approval of PB. Despite the numerous papers suggesting or describing the in vivo use of PBnps, no studies have been carried out on the formation of a protein corona on the PBnp surface and its stabilizing role. In this paper, we studied qualitatively and quantitatively the corona formed by the most abundant protein of blood, human serum albumin (HSA). Cubic PBnps (41 nm side), prepared in citric acid solution at PB concentration 5 × 10^-4 M, readily form a protein corona by redissolving ultracentrifuged PBnp pellets in HSA solutions, with C_HSA ranging from 0.025 to 7.0 mg/mL. The basic decomposition of PBnp@HSA was studied in phosphate buffer at the physiological pH value of 7.4. Increased stability with respect to uncoated PBnps was observed at all concentrations, but a minimum C_HSA value of 3.0 mg/mL was determined to obtain stability identical to that observed at serum-like HSA concentrations (35-50 mg/mL). Using a modified Lowry protocol, the quantity of firmly bound HSA in the protein corona (hard corona) was determined for all the C_HSA used in the PBnp@HSA synthesis, finding increasing quantities with increasing C_HSA. In particular, an HSA/PBnp number in the 1500-2300 range was found for C_HSA 3.0-7.0 mg/mL, largely exceeding the 180 HSA/PBnp value calculated for an HSA monolayer on a PBnp. Finally, the stabilization brought by the HSA corona allowed us to carry out pH-spectrophotometric titrations on PBnp@HSA in the 3.5-9-0 pH range, revealing a pKa value of 6.68 for the water molecules bound to the Fe³⁺ centers on the PBnp surface, whose deprotonation is responsible for the blue-shift of the PBnp band from 706 nm (acidic solution) to 685 nm (basic solution).</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11356891/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080988","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":"Enhancing the Performance of Ba_xMnO₃ (x = 1, 0.9, 0.8 and 0.7) Perovskites as Catalysts for CO Oxidation by Decreasing the Ba Content.","authors":"Á Díaz-Verde, M J Illán-Gómez","doi":"10.3390/nano14161334","DOIUrl":"10.3390/nano14161334","url":null,"abstract":"<p><p>Mixed oxides featuring perovskite-type structures (ABO₃) offer promising catalytic properties for applications focused on the control of atmospheric pollution. In this work, a series of Ba_xMnO₃ (x = 1, 0.9, 0.8 and 0.7) samples have been synthesized, characterized and tested as catalysts for CO oxidation reaction in conditions close to that found in the exhausts of last-generation automotive internal combustion engines. All samples were observed to be active as catalysts for CO oxidation during CO-TPRe tests, with Ba_0.7MnO₃ (B0.7M) being the most active one, as it presents the highest amount of oxygen vacancies (which act as active sites for CO oxidation) and Mn (IV), which features the highest levels of reducibility and the best redox properties. B0.7M has also showcased a high stability during reactions at 300 °C, even though a slightly lower CO conversion is achieved during the second consecutive reaction cycle. This performance appears to be related to the decrease in the Mn (IV)/Mn (III) ratio.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357658/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142080980","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}