Nanomaterials最新文献

{"title":"Photocatalytic Degradation of Ciprofloxacin by GO/ZnO/Ag Composite Materials.","authors":"Haonan Chi, Pan Cao, Qi Shi, Chaoyu Song, Yuguang Lv, Tai Peng","doi":"10.3390/nano15050383","DOIUrl":"10.3390/nano15050383","url":null,"abstract":"<p><p>This study synthesized graphene oxide (GO)/zinc oxide (ZnO)/silver (Ag) composite materials and investigated their photocatalytic degradation performance for ciprofloxacin (CIP) under visible light irradiation. GO/ZnO/Ag composites with different ratios were prepared via an impregnation and chemical reduction method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The results demonstrated that under optimal conditions (20 mg/L CIP concentration, 15 mg catalyst dosage, GO/ZnO-3%/Ag-doping ratio, and pH 5), the GO/ZnO/Ag composite exhibited the highest photocatalytic activity, achieving a maximum degradation rate of 82.13%. This catalyst effectively degraded ciprofloxacin under light irradiation, showing promising potential for water purification applications.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901575/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605618","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":"Biosynthesis Scale-Up Process for Magnetic Iron-Oxide Nanoparticles Using <i>Eucalyptus globulus</i> Extract and Their Separation Properties in Lubricant-Water Emulsions.","authors":"Yacu Vicente Alca-Ramos, Noemi-Raquel Checca-Huaman, Renzo Rueda-Vellasmin, Edson Caetano Passamani, Juan A Ramos-Guivar","doi":"10.3390/nano15050382","DOIUrl":"10.3390/nano15050382","url":null,"abstract":"<p><p>The use of natural organic extracts in nanoparticle synthesis can reduce environmental impacts and reagent costs. With that purpose in mind, a novel biosynthesis procedure for the formation of magnetic iron-oxide nanoparticles (IONPs) using <i>Eucalyptus globulus</i> extract in an aqueous medium has been systematically carried out. First, the biosynthesis was optimized for various extract concentrations, prepared by decoction and infusion methods, and yielded IONPs with sizes from 4 to 9 nm. The optimum concentration was found at 5% <i>w</i>/<i>v</i>, where the biosynthesis reaction time and ammonium hydroxide amount were the lowest of all samples. This extract concentration was tested, including in replicated samples, for a scale-up process, yielded a total mass of 70 g. It was found by Rietveld and electron microscopy analyses that the structural and morphological properties, such as crystalline and particle sizes (9 nm), are equivalent when scaling the synthesis process. ⁵⁷Fe Mössbauer spectroscopy results indicated that Fe ions are atomically ordered and in a trivalent state in all samples, corroborating with structural results found by X-ray diffraction. Magnetic analysis showed that the scale-up sample exhibited ferrimagnetic-like behavior suitable for magnetic remediation performance (55 emu g^-1). The eucalyptus functionalization was demonstrated by thermogravimetric measurements, whereas the colloidal analysis supported the stability of the magnetic suspensions at pH = 7 (zeta potential > -20 mV). The kinetic adsorption performance indicated a fast kinetic adsorption time of 40 min and remarkable removal efficiency of 96% for lubricant removal from water (emulsion systems). The infrared analysis confirmed the presence of the eucalyptus chemical groups even after the removal experiments. These results suggest that the scale-up sample can be recovered for future and sustainable magnetic remediation processes.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901733/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605385","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":"Electrochemical Synthesis of Polyaniline and Sheet-like Structure of Molybdenum Selenide (PANI@2D-MoSe₂) Binary Composite for Solar Cell Applications.","authors":"Alagumalai Manimekalai, Vediyappan Thirumal, Jinho Kim, Bathula Babu, Kuppu Sakthi Velu","doi":"10.3390/nano15050384","DOIUrl":"10.3390/nano15050384","url":null,"abstract":"<p><p>In this work, a promising material of polyaniline (PANI) and two-dimensional molybdenum diselenides consisting of a PANI@2D-MoSe₂ binary composite was prepared by an electrochemical polymerization ethod. The as-prepared PANI@2D-MoSe₂, the polymer covered in the sheet-like structure of 2D-MoSe₂ surface morphologies, was observed through FE-SEM and HR-TEM studies. The SAED pattern of PANI@2D-MoSe₂ was observed to be in an octahedral phase. The octahedral crystalline phase was also confirmed based on the XRD pattern. In addition, EIS studies of the PANI@2D-MoSe₂ binary composite counter electrode (CE) revealed the highest electrical conductivity of 3.47 × 10^-4 S/cm at room temperature. The DSSCs assembled the PANI@2D-MoSe₂ CE, which amounted to a 7.38% efficiency. Pristine PANI, 2D-MoSe₂, and Pt CEs exhibited efficiencies of 5.07%, 5.82%, and 6.61%. The PANI integrated with 2D (MoSe) combines influences of conductivity and stability for future energy conversion technologies.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901682/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605771","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":"Optical Nonreciprocity Based on the Four-Wave Mixing Effect in Semiconductor Quantum Dots.","authors":"Zelin Lin, Han Yang, Fei Xu, Yihong Qi, Yueping Niu, Shangqing Gong","doi":"10.3390/nano15050380","DOIUrl":"10.3390/nano15050380","url":null,"abstract":"<p><p>Optical nonreciprocity and nonreciprocal devices such as optical diodes have broad and promising applications in various fields, ranging from optical communication to signal process. Here, we propose a magnet-free nonreciprocal scheme based on the four-wave mixing (FWM) effect in semiconductor quantum dots (SQDs). Via controlling the directions of the coupling fields, the probe field can achieve high transmission in the forward direction within a certain frequency range due to the FWM effect. And the transmission of the probe field in the backward direction undergoes significant reduction, as the FWM effect is absent. The calculation results show a wide nonreciprocal transmission window with isolation greater than 12 dB and insertion loss lower than 0.08 dB. The influences of the Rabi frequencies of the coupling fields, the medium length, and the decay rates on the nonreciprocal propagation of the probe field are also studied, showing the requirements of these parameters for good nonreciprocal performances. Our work may offer an insight for developing optical nonreciprocal devices based on the FWM process and the SQD system.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901769/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605436","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 and Characterization of Silver Nanoparticles from <i>Tinospora cordifolia</i> Leaf Extract: Evaluation of Their Antioxidant, Anti-Inflammatory, Antibacterial, and Antibiofilm Efficacies.","authors":"Vijaya Durga V V Lekkala, Arun Vasista Muktinutalapati, Veeranjaneya Reddy Lebaka, Dakshayani Lomada, Mallikarjuna Korivi, Wei Li, Madhava C Reddy","doi":"10.3390/nano15050381","DOIUrl":"10.3390/nano15050381","url":null,"abstract":"<p><p>The use of metal nanoparticles is gaining popularity owing to their low cost and high efficacy. We focused on green synthesis of silver nanoparticles (AgNPs) using <i>Tinospora cordifolia</i> (Tc) leaf extracts. The structural characteristics of Tc nanoparticles (TcAgNPs) were determined using several advanced techniques. Pharmacological activities, including antioxidant, anti-inflammatory, and antibacterial properties, were evaluated through in vitro studies. In the results, the change in sample color from yellow to brown after adding silver nitrate revealed the synthesis of TcAgNPs, and the UV-visible spectrum confirmed their formation. X-ray diffraction studies showed the presence of reducing agents and the crystalline nature of the nanoparticles. Fourier-transform infrared spectra revealed the existence of essential secondary metabolites, which act as reducing/capping agents and stabilize the nanoparticles. The size of the TcAgNPs was small (range 36-168 nm) based on the measurement method. Their negative zeta potential (-32.3 mV) ensured their stability in water suspensions. The TcAgNPs were predominantly spherical, as evidenced from scanning electron microscopy and transmission electron microscopy. Atomic absorption spectroscopy data further revealed the conversion of silver nitrate into silver nanoparticles, and thermogravimetric analysis data showed their thermal stability. The TcAgNPs showed significant DPPH/ABTS radical scavenging ability in a concentration-dependent manner (25-100 µg/mL). Membrane lysis assays showed an effective anti-inflammatory activity of the TcAgNPs. Furthermore, the TcAgNPs showed potent antibacterial effects against multidrug-resistant bacteria (<i>Pseudomonas aeruginosa</i>, <i>Klebsiella pneumonia</i>, <i>Escherichia coli</i>, and <i>Staphylococcus aureus</i>). The TcAgNPs treatment also exhibited antibiofilm activity against bacterial strains, in a concentration-dependent manner. Our findings demonstrate the structural characteristics of green-synthesized TcAgNPs using advanced techniques. TcAgNPs can be developed as potential antioxidant, anti-inflammatory, and antibacterial drugs.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901609/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605785","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":"Research Advances in Ion Exchange of Halide Perovskites.","authors":"Chao Du, Kaiwang Chen, Jiangshan Chen, Dongge Ma","doi":"10.3390/nano15050375","DOIUrl":"10.3390/nano15050375","url":null,"abstract":"<p><p>In recent years, halide perovskite materials have been extensively studied by researchers due to their excellent optoelectronic characteristics. Unlike traditional semiconductors, halide perovskites possess unique ionic crystal structures, which makes it easier to perform facile composition engineering to tailor their physical and chemical properties. Ion exchange is a popular post-treatment strategy to achieve composition engineering in perovskites, and various ion exchange processes have been used to modify the structural and functional features of prefabricated perovskites to meet the requirements of desired applications. This review summarizes the recent progress in ion exchange of halide perovskites, including mechanisms, strategies, and studies on different ion exchange. Additionally, the applications of ion-exchanged perovskites in microfluidic sensors, light-emitting diodes (LEDs), lasers, and solar cells are presented. Lastly, we briefly discuss the challenges in ion exchange of perovskites and hope that ion exchange can provide a more refined and reliable method for the preparation of high-performance perovskites.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901563/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605694","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":"Metal Nanoparticles Obtained by Green Hydrothermal and Solvothermal Synthesis: Characterization, Biopolymer Incorporation, and Antifungal Evaluation Against <i>Pseudocercospora fijiensis</i>.","authors":"Tania Caguana, Christian Cruzat, David Herrera, Denisse Peña, Valeria Arévalo, Mayra Vera, Pablo Chong, Néstor Novoa, Ramón Arrué, Eulalia Vanegas","doi":"10.3390/nano15050379","DOIUrl":"10.3390/nano15050379","url":null,"abstract":"<p><p>Nanoparticles (NPs) have generated significant interest in various fields due to the unique properties that materials exhibit at the nanoscale. This study presents a comparative analysis of copper nanoparticles (Cu-NPs) and cobalt nanoparticles (Co-NPs) synthesized via conventional solvothermal and green hydrothermal synthesis using ethylene glycol and <i>Medicago sativa</i> extract, respectively. The conventional solvothermal synthesis showed higher efficiency for both Cu-NPs and Co-NPs with yields of 32.5% and 26.7%, respectively. Characterization through UV-visible spectroscopy (UV-vis), Fourier-transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) revealed that while solvothermal synthesis produced larger particles (76.5 nm for Cu-NPs, 86.8 nm for Co-NPs), the green hydrothermal method yielded smaller particles (53.8 nm for Cu-NPs, 67.7 nm for Co-NPs) with better control over particle size distribution and spherical morphology, showing minimal agglomeration. UV-vis confirmed metal oxide formation, while FTIR showed complex patterns in NPs (green hydrothermal), indicating plant extract compounds. Antifungal evaluation against <i>Pseudocercospora fijiensis</i> showed complete inhibition at 2000 ppm for both NP types, with no mycelial growth after 30 days. When integrated into chitosan, solvothermal NPs produced rougher surfaces, and scanning electron microscope (SEM) confirmed the presence of copper and cobalt in the nanocomposites. This study provides insights into the synthesis of nanoparticles using an environmentally friendly process and their microbiological applications for future use in organic agriculture.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901758/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605732","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":"Fluorescence Quenching of Graphene Quantum Dots from Orange Peel for Methyl Orange Detection.","authors":"Weitao Li, Yang Liu, Xinglong Pang, Yuanhao Huang, Zeyun Dong, Qian Niu, Yuping Xiong, Shang Li, Shuai Li, Lei Wang, Huazhang Guo, Saisai Cui, Shenpeng Hu, Yuenan Li, Tiantian Cha, Liang Wang","doi":"10.3390/nano15050376","DOIUrl":"10.3390/nano15050376","url":null,"abstract":"<p><p>Methyl orange (MO) is an organic synthetic dye widely used in laboratory and industrial applications. In laboratory settings, it serves as an acid-base indicator due to its distinct color change in both acidic and alkaline environments. Industrially, it is primarily utilized in the textile industry for its ultraviolet (UV) absorption properties. However, the discharge and leakage of methyl orange into the environment can cause severe ecological damage and pose potential carcinogenic and teratogenic risks to human health. Therefore, detecting and quantifying the concentration of methyl orange in various matrices is crucial. This study reports the synthesis of graphene quantum dots (GQDs) from orange peel as a precursor, using ethanol and dimethylformamide (DMF) as solvents. Cyan (c-GQDs) and yellow (y-GQDs) graphene quantum dots were synthesized through a bottom-up hydrothermal method. The difference in color is attributed to the redshift caused by the varying ratio of pyridine nitrogen to pyrrole nitrogen. These GQDs exhibited notable optical properties, with c-GQDs emitting cyan fluorescence and y-GQDs emitting yellow fluorescence under UV light. To investigate fluorescence quenching effects, nine commonly used dyes were tested, and all were found to quench the fluorescence of y-GQDs, with methyl orange having the most significant effect. The fluorescence quenching of orange peel-derived GQDs in the presence of methyl orange is attributed to poor dispersion in DMF solution. Additionally, the GQDs possess high specific surface area, abundant surface functional groups, and excellent electronic conductivity, which contribute to their effective fluorescence quenching performance. The average thickness of y-GQDs (the vertical dimension from the substrate upwards) was 3.51 nm, confirming their graphene-like structure. They emitted yellow fluorescence within the wavelength range of 450-530 nm. Notably, a significant linear correlation was found between the concentration of methyl orange and the fluorescence intensity of y-GQDs (regression coefficient = 0.9954), indicating the potential of GQDs as effective sensing materials for organic pollutant detection.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901586/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605781","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":"Intensity Modulation Effects on Ultrafast Laser Ablation Efficiency and Defect Formation in Fused Silica.","authors":"Dai Yoshitomi, Hideyuki Takada, Shinichi Kinugasa, Hiroshi Ogawa, Yohei Kobayashi, Aiko Narazaki","doi":"10.3390/nano15050377","DOIUrl":"10.3390/nano15050377","url":null,"abstract":"<p><p>Ultrafast laser processing is a critical technology for micro- and nano-fabrication due to its ability to minimize heat-affected zones. The effects of intensity variation on the ultrafast laser ablation of fused silica were investigated to gain fundamental insights into the dynamic modulation of pulse intensity. This study revealed significant enhancement in ablation efficiency for downward ramp intensity modulation compared to the upward ramp. This effect was independent of the repetition rate ranging from 100 Hz to 1 MHz, which suggested that it originates from persistent residual effects of preceding pulses. Photoluminescence experiments indicated that the observed effect is primarily attributed to the dynamic reduction in the ablation threshold caused by the formation of defects such as non-bridging oxygen hole centers. The correlation between the sequence of intensity-modulated pulses and defect formation has been clarified. The knowledge of these correlations, combined with machine learning-based optimization methods, is useful for the optimization of the throughput and quality of ultrafast laser processing.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901963/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605800","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":"Photothermal and Hydrophobic Surfaces with Nano-Micro Structure: Fabrication and Their Anti-Icing Properties.","authors":"Meng Li, Renping Ma, Chaokun Yang, Lebin Wang, Shuangqi Lv, Xin Zhao, Mengyao Pan, Jianjian Zhu, Hongbo Xu","doi":"10.3390/nano15050378","DOIUrl":"10.3390/nano15050378","url":null,"abstract":"<p><p>The formation of ice due to global climate change poses challenges across multiple industries. Traditional anti-icing technologies often suffer from low efficiency, high energy consumption, and environmental pollution. Photothermal and hydrophobic surfaces with nano-micro structures (PHS-NMSs) offer innovative solutions to these challenges due to their exceptional optical absorption, heat conversion capabilities, and unique surface water hydrophobic characteristics. This paper reviews the research progress of PHS-NMSs in their anti-icing applications. It introduces the mechanisms of ice prevention, fabrication methods, and pathways for performance optimization of PHS-NMSs. The anti-icing performance of PHS-NMSs in different application scenarios is also discussed. Additionally, the paper provides insights into the challenges and future development directions in this field.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11901621/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605540","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}