Journal of Nanoscience and Technology最新文献_第3页

Study on Optical Properties of Green Synthesized Silver Nanoparticles for Surface Plasmon Resonance 绿色合成纳米银表面等离子体共振光学特性研究

Journal of Nanoscience and Technology Pub Date : 2019-05-06 DOI: 10.30799/JNST.230.19050203

H. Bhangale, S. G. Bachhav, D. Nerkar, K. M. Sarode, D. R. Patil

{"title":"Study on Optical Properties of Green Synthesized Silver Nanoparticles for Surface Plasmon Resonance","authors":"H. Bhangale, S. G. Bachhav, D. Nerkar, K. M. Sarode, D. R. Patil","doi":"10.30799/JNST.230.19050203","DOIUrl":"https://doi.org/10.30799/JNST.230.19050203","url":null,"abstract":"Article history: Received 29 March 2019 Accepted 16 April 2019 Available online 06 May 2019 In the present study green, rapid, extracellular synthesis of silver nanoparticles was achieved under alkaline conditions using Penicillium species. The synthesis of silver nanoparticles is greatly influenced by the pH value of the reaction medium and studied visually as well as using UV-visible spectrophotometer. The SPR absorption bands appeared in the range between 408 nm and 415 nm confirm the formation of the silver nanoparticles. Silver nanoparticles prepared at pH value 10 were further characterized using XRD, SEM, TEM, photoluminescence spectroscopy. X-ray diffraction analysis exhibited the crystalline nature of the prepared silver nanoparticles with face centered cubic structure. The prepared silver nanoparticles were spherical in shape as revealed from SEM and TEM images with the sizes in the range between 11 to 19 nm. The emission spectra were recorded at 530 nm when excited at 400 nm in photoluminescence spectroscope. The prepared silver nanoparticles were evaluated for their catalytic activity in the reduction of MB by NaBH4 and exhibit the excellent results.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125126403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Degradation of Evans Blue using Multi-Walled Carbon Nanotubes (MWCNTs) – Barium Chromate Composite 多壁碳纳米管-铬酸钡复合材料降解埃文斯蓝

Journal of Nanoscience and Technology Pub Date : 2019-05-06 DOI: 10.30799/JNST.227.19050204

N. Kapoor, R. Ameta, S. Ameta

引用次数: 1

Green Synthesis, Characterization and Applications of Silver Nanoparticles using Thunbergia grandiflora Roxb. 大戟属纳米银的绿色合成、表征及应用。

Journal of Nanoscience and Technology Pub Date : 2019-05-06 DOI: 10.30799/JNST.217.19050206

A. Mathew, Salvy Thomas

{"title":"Green Synthesis, Characterization and Applications of Silver Nanoparticles using Thunbergia grandiflora Roxb.","authors":"A. Mathew, Salvy Thomas","doi":"10.30799/JNST.217.19050206","DOIUrl":"https://doi.org/10.30799/JNST.217.19050206","url":null,"abstract":"Green synthesis of silver nanoparticles from the leaf extract of Thunbergia grandiflora Roxb. was carried out by bioreduction of silver nitrate to silver nanoparticles due to the presence of biological compounds present in the leaf. The reaction mixture showed a colour change from colourless to reddish brown. The characterization of silver nanoparticles was done by using UV-Visible spectroscopy, FTIR, and TEM. For UV-Visible spectrometry the strong surface plasmon resonance centered at 436 nm. The FTIR analysis showed prominent bands of absorbance at 598.35, 1634.05, 2079.30, 2333.3 and 3332.60 cm-1. TEM analysis revealed that most of the particles fall in the size range from 0 – 5 nm with an average size of 2.39 nm and the particles were spherical in shape. The nanoparticles obtained were checked for its antibacterial activity by disc diffusion method. The silver nanoparticles showed positive results with Klebsiella planticola, but didn’t show any antibacterial effect against Bacillus subtilis. The silver nanoparticles also positively influenced on seed germination and growth by escalating the germination percentage and growth rate of seedlings.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"96 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125289349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Structural Rietveld Refinement of Nickel Ferrite Nanoparticles Prepared by Chemical Method 化学法制备铁酸镍纳米颗粒的结构Rietveld细化

Journal of Nanoscience and Technology Pub Date : 2019-05-06 DOI: 10.30799/JNST.223.19050202

Y. B. Kannan

引用次数: 2

Synthesis and Characterization of Bioinspired Silver Nanoparticles by Aqueous Leaf Extract of Indigofera cassioides: Evaluation of Antimicrobial and Cytotoxic Activity 靛蓝叶提取物制备纳米银纳米颗粒及其抑菌活性和细胞毒活性评价

Journal of Nanoscience and Technology Pub Date : 2019-05-06 DOI: 10.30799/JNST.222.19050208

R. Kumar, S. Kumar, M. A. Lathiff, G. Muthuboopathi

{"title":"Synthesis and Characterization of Bioinspired Silver Nanoparticles by Aqueous Leaf Extract of Indigofera cassioides: Evaluation of Antimicrobial and Cytotoxic Activity","authors":"R. Kumar, S. Kumar, M. A. Lathiff, G. Muthuboopathi","doi":"10.30799/JNST.222.19050208","DOIUrl":"https://doi.org/10.30799/JNST.222.19050208","url":null,"abstract":"The green synthesis of silver nanoparticles (AgNPs) has increasingly promising due to their potential applications in nanomedicine. For the first time, silver nanoparticles (AgNPs) were synthesized from aqueous leaf extract of Indigofera cassioides. The AgNPs were characterized by UV-Vis spectroscopy and the characteristic surface plasmon resonance peak was observed at 414 nm. The Fourier transform infrared spectroscopy (FT-IR) revealed the phytochemicals in the plant extract which assisted bioreduction, capping and stabilizing agent. Morphology of AgNPs was characterized by transmission electron microscopy (TEM) and they were spherical shape with average particle size as 20 nm. The face centered cubic (FCC) crystalline structure of the AGNPs was confirmed by X-ray diffraction. Dynamic light scattering (DLS) and zeta potential analysis revealed that the average hydrodynamic diameter of the AGNPs as 80 nm and the negative zeta potential value of -36.6 mV indicates good stability. Antimicrobial studies disclosed that the biosynthesized AgNPs possess strong activity against pathogenic bacteria. The cytotoxicity study is concealed that the AgNPs exhibit selective cytotoxicity against the tested cell lines and a pronounced activity was observed against human breast cancer cells (MCF-7). The present study concludes that for the biosynthesized AgNPs could be used as an antimicrobial and anticancer agent.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126991309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Structural and Dielectric Investigations of Cerium Stabilized Zirconia (Zr1-xCexO2(x=0-0.05)) Nanocrystals Blended by Wet Chemical Method 湿化学法混合铈稳定氧化锆(Zr1-xCexO2(x=0-0.05))纳米晶的结构和介电性能研究

Journal of Nanoscience and Technology Pub Date : 2019-05-05 DOI: 10.30799/JNST.220.19050201

H. C. Madhusudhana, S. N. Shobhadevi, B. Nagabhushana, R. Krishna, M. Murugendrappa, H. Nagabhushana

{"title":"Structural and Dielectric Investigations of Cerium Stabilized Zirconia (Zr1-xCexO2(x=0-0.05)) Nanocrystals Blended by Wet Chemical Method","authors":"H. C. Madhusudhana, S. N. Shobhadevi, B. Nagabhushana, R. Krishna, M. Murugendrappa, H. Nagabhushana","doi":"10.30799/JNST.220.19050201","DOIUrl":"https://doi.org/10.30799/JNST.220.19050201","url":null,"abstract":"Cerium doped ZrO2 nano crystals (Zr1-xCexO2(x=0-0.05)) have been synthesized by solution combustion method using glycine as a fuel at furnace temperature 400 °C. The obtained samples are characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy, UV-Vis-spectroscopy and AC conductivity techniques. The XRD patterns exhibit decrease in crystallinity of the sample with increase in dopant concentration. The crystallite size is found to be 20-30 nm. The particle size is decreasing with Ce3+ concentration. The SEM analysis reveals change of porosity and shape of ZrO2 samples from spherical grain structure at 1 mol% of Ce3+ to irregular flake like structures in shape at 5 mol% of Ce3+. The band gap is decreasing from 4 to 3.3 eV as the doping concentration increases. AC impedance spectroscopy results of the as synthesized Ce doped ZrO2 shows good dielectric properties with a very high dielectric constant. Sample of ZrO2 doped with 5 mol% Ce3+ is found to have high dielectric constant (ɛʹ = 50) and the lowest dielectric constant (ɛʹ = 18) is found for undoped ZrO2 at 10 MHz. The lowest dielectric loss is measured for the sample having 5 mol% cerium doped zirconia.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127671231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Green Synthesis of Copper Nanoparticles using Mitragyna parvifolia Plant Bark Extract and Its Antimicrobial Study 细叶假丝菊树皮提取物绿色合成纳米铜及其抗菌研究

Journal of Nanoscience and Technology Pub Date : 2018-08-05 DOI: 10.30799/JNST.133.18040415

Shaileshkumar C. Kotval, Tessy John, K. Parmar

{"title":"Green Synthesis of Copper Nanoparticles using Mitragyna parvifolia Plant Bark Extract and Its Antimicrobial Study","authors":"Shaileshkumar C. Kotval, Tessy John, K. Parmar","doi":"10.30799/JNST.133.18040415","DOIUrl":"https://doi.org/10.30799/JNST.133.18040415","url":null,"abstract":"In this study, Mitragyna parvifolia plant bark used to prepare aqueous extract which provides cost-effective, eco-friendly process, less time consuming, an environmentally benign, easy and proficient way for the synthesis of copper nanoparticles. Mitragyna parvifolia plant bark was collected from Virpur hills forest area. The Mitragyna parvifolia plant bark extract was prepared with deionised water and used for the green synthesis of copper nanoparticles. The colour change of the solution dark brown from pale yellow colour confirms the formation of copper nanoparticles. The green synthesised copper nanoparticles were characterised by UV-visible spectroscopy, FT-IR, XRD, SEM, TEM and their antimicrobial activity was also investigated. UV-visible spectral result confirmed the reduction of copper sulphate to copper nanoparticles. FTIR analysis also supported for the formation of copper nanoparticles. Crystallinity of Cu NPs was find out by XRD study and the morphology of the particles was analysed with the help of scanning electron microscopy and found spherical in nature. The antibacterial activity experiment done against Escherichia coli, gram-negative and Bacillus subtilis, gram-positive bacteria by agar well method and the maximum zone of inhibition was higher in gram-positive bacteria compared to gram-negative bacteria. The green synthesised copper nanoparticles proved to be potential candidates for medical application where the antimicrobial activity is highly essential.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131469619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Biosynthesis and Characterization of Iron Oxide Nanoparticles Synthesized using Earthworm Based Extracts 蚯蚓提取物合成氧化铁纳米颗粒的生物合成及表征

Journal of Nanoscience and Technology Pub Date : 2018-08-05 DOI: 10.30799/JNST.140.18040414

P. Suganya, P. Mahalingam

引用次数: 0

Highly Stable Dye Sensitized Solar Cells with TiO2/MWCNT Nanocomposite Photoanodes 具有TiO2/MWCNT纳米复合光阳极的高稳定染料敏化太阳能电池

Journal of Nanoscience and Technology Pub Date : 2018-07-22 DOI: 10.30799/JNST.136.18040412

S. Kiran, S. K. Kumar

{"title":"Highly Stable Dye Sensitized Solar Cells with TiO2/MWCNT Nanocomposite Photoanodes","authors":"S. Kiran, S. K. Kumar","doi":"10.30799/JNST.136.18040412","DOIUrl":"https://doi.org/10.30799/JNST.136.18040412","url":null,"abstract":"Ever since the first Dye Sensitized Solar Cells (DSSCs) have been reported in 1991, a considerable research is going on for improving its efficiency. The intensive research has made conversion efficiency to reach 14.3%. Although, fewer efforts have been made towards the study of their stability. This paper deals with the addition of MWCNTs to TiO 2 photoanode and their effect on the stability of the DSSCs. Nanocomposites of MWCNT and TiO 2 nanoparticles have been prepared in two different methods and characterized using FESEM and XRD. An optimum thick photoanodes were prepared using these composites and used in DSSC preparation. The photovoltaic performance of DSSCs was observed for a period of 6 months with an interval of 2 months. A huge decline was observed in the performance of cells made with pristine TiO 2 photoanode whereas the cells with TiO 2 /MWCNT nanocomposite photoanode showed stability with a negligible decrease in the efficiency. Cells with nanocomposites prepared in both the methods were able to maintain their short circuit current (JSC) and open circuit voltage (VOC) even after continuous exposure of ambient light for 6 months. The work concludes that the addition of MWCNTs has made DSSCs less susceptible for ambient conditions.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125164483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and Characterization of Nano Ag2O and Cu(OH)2 by Solution Reduction Method and Their Antibacterial Studies 溶液还原法制备纳米Ag2O和Cu(OH)2及其抑菌性能

Journal of Nanoscience and Technology Pub Date : 2018-07-22 DOI: 10.30799/JNST.130.18040409

R. Rajakumari, C. Priya, A. Srilekha

{"title":"Synthesis and Characterization of Nano Ag2O and Cu(OH)2 by Solution Reduction Method and Their Antibacterial Studies","authors":"R. Rajakumari, C. Priya, A. Srilekha","doi":"10.30799/JNST.130.18040409","DOIUrl":"https://doi.org/10.30799/JNST.130.18040409","url":null,"abstract":"Silver oxide (Ag 2 O) and copper(II)hydroxide (Cu(OH) 2 ) nanoparticles were synthesized through a simple solution reduction method using silver nitrate (AgNO 3 ) and copper sulphate pentahydrate (CuSO 4 .5H 2 O) in the presence of sodium hydroxide (NaOH) as reducing agent. X-ray diffraction (XRD) analysis, scanning electron microscopic (SEM) analysis, Fourier transform infrared spectroscopic (FT-IR) analysis, UV-absorption and photoluminescence (PL), vibrating sample magnetometer (VSM) studies were performed to confirm the size distribution measurement, surface morphology, optical and magnetic properties of the synthesized samples. Silver nanoparticles synthesized in the form of Ag 2 O and copper in the form of Cu(OH) 2 was confirmed by the XRD study. The UV-Vis absorption analysis indicates that the absorption peak for Ag 2 O in the lower wavelength region of the optical spectrum. The sharp intensity peaks in the FTIR spectrum of Ag 2 O and Cu(OH) 2 indicate the stretching and bending frequencies of the molecular functional groups in the samples as well as their high crystalline nature. The SEM images show the shape of Ag 2 O nanoparticles is nearly spheroid. The VSM study of Cu(OH) 2 shows ferromagnetic interaction at room temperature. The antibacterial properties of Ag 2 O and Cu(OH) 2 on Staphylococcus aureus and Escherichia coli indicate that both the samples are effective on Staphylococcus aureus , which is concentration dependent.","PeriodicalId":187599,"journal":{"name":"Journal of Nanoscience and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123037206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3