Pub Date : 2018-11-11DOI: 10.30799/JNST.177.18040521
R. Shabu, A. Moses Ezhil Raj
As major attention has been paid to transition metal oxide semiconductor suitable for solar cell, photo detector and gas sensor, present study embark on the structural, optical and electrical characterization of Ag doped CuO thin films prepared using chemical spray pyrolysis technique at the constant substrate temperature of 350 �C. For Ag doping, various concentrations of silver acetate (0.5-3.0 wt.%) was used in the sprayed precursor solution. Confirmed monoclinic lattice shows the tenorite phase formation of CuO in the pure and Ag doped films. The optical band gap of the films was in the range of 2.4 -3.4 eV. A minimum resistivity of 0.0017x103 ohmcm was achieved in the 0.5 wt.% Ag doped film, and its optical band gap was 2.74 eV.
{"title":"Influence of Ag-Dopant on Structural Optical and Electrical Properties of Cu(1-x)AgxO Thin Films Prepared By Chemical Spray Pyrolysis Technique","authors":"R. Shabu, A. Moses Ezhil Raj","doi":"10.30799/JNST.177.18040521","DOIUrl":"https://doi.org/10.30799/JNST.177.18040521","url":null,"abstract":"As major attention has been paid to transition metal oxide semiconductor suitable for solar cell, photo detector and gas sensor, present study embark on the structural, optical and electrical characterization of Ag doped CuO thin films prepared using chemical spray pyrolysis technique at the constant substrate temperature of 350 �C. For Ag doping, various concentrations of silver acetate (0.5-3.0 wt.%) was used in the sprayed precursor solution. Confirmed monoclinic lattice shows the tenorite phase formation of CuO in the pure and Ag doped films. The optical band gap of the films was in the range of 2.4 -3.4 eV. A minimum resistivity of 0.0017x103 ohmcm was achieved in the 0.5 wt.% Ag doped film, and its optical band gap was 2.74 eV.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132502613","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}
Pub Date : 2018-11-11DOI: 10.30799/JNST.170.18040519
A. Jadhav, B. Raghunanda, Ashok D. Shetkar, Ajai Kumar S. Molakeri
Zinc ferrite (ZnFe2O4) nanocrystalline powder material was prepared by combustion method. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) is used to study on structural properties. The magnetic properties of the sample were measured at room temperature using vibrating sample magnetometer (VSM) in the field range �15000 G. Hysteresis loop obtained room temperature for ZnFe2O4 nanoparticles indicates that the nanoparticles are ferromagnetic in nature.
{"title":"Characterization and Magnetic Properties of Zinc Ferrite Synthesized by Combustion Route","authors":"A. Jadhav, B. Raghunanda, Ashok D. Shetkar, Ajai Kumar S. Molakeri","doi":"10.30799/JNST.170.18040519","DOIUrl":"https://doi.org/10.30799/JNST.170.18040519","url":null,"abstract":"Zinc ferrite (ZnFe2O4) nanocrystalline powder material was prepared by combustion method. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) is used to study on structural properties. The magnetic properties of the sample were measured at room temperature using vibrating sample magnetometer (VSM) in the field range �15000 G. Hysteresis loop obtained room temperature for ZnFe2O4 nanoparticles indicates that the nanoparticles are ferromagnetic in nature.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127322194","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}
Pub Date : 2018-11-11DOI: 10.30799/JNST.166.18040518
S. Arora, I. Shvets
This present work reported here the influence of miscut angle of vicinal MgO (100) substrates (with miscut angle between 1-5� along <011> direction) on the magnetoresistance (MR) behavior of epitaxial magnetite (Fe3O4) films. By varying the miscut angle, we are able to control the step-terrace periodicity of the substrate surface, which allows us to tailor the density of the step-edges induced antiphase boundaries, APBs (nanoscale liner defects formed during growth due to coalescence of neighbouring domains), in epitaxial Fe3O4 films. We found that the contribution from the step-edges induced APBs to the magnetoresistance (MRSE) in Fe3O4 films increases with increase in miscut (up to 2�) and decreases for larger miscut angles. From temperature dependent studies, we observed that the magnitude of MRSE increased with decrease in temperature and peaks at the Verwey transition. The decrease in MRSE for larger miscut samples is attributed to the influence of APB strain-fields on the degree of spin-polarization of Fe3O4 regions on terraces.
{"title":"Influence of Miscut Angle on the Magnetoresistance Behavior of Epitaxial Fe3O4 Thin Films Grown on Vicinal Substrates","authors":"S. Arora, I. Shvets","doi":"10.30799/JNST.166.18040518","DOIUrl":"https://doi.org/10.30799/JNST.166.18040518","url":null,"abstract":"This present work reported here the influence of miscut angle of vicinal MgO (100) substrates (with miscut angle between 1-5� along <011> direction) on the magnetoresistance (MR) behavior of epitaxial magnetite (Fe3O4) films. By varying the miscut angle, we are able to control the step-terrace periodicity of the substrate surface, which allows us to tailor the density of the step-edges induced antiphase boundaries, APBs (nanoscale liner defects formed during growth due to coalescence of neighbouring domains), in epitaxial Fe3O4 films. We found that the contribution from the step-edges induced APBs to the magnetoresistance (MRSE) in Fe3O4 films increases with increase in miscut (up to 2�) and decreases for larger miscut angles. From temperature dependent studies, we observed that the magnitude of MRSE increased with decrease in temperature and peaks at the Verwey transition. The decrease in MRSE for larger miscut samples is attributed to the influence of APB strain-fields on the degree of spin-polarization of Fe3O4 regions on terraces.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133311611","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}
Pub Date : 2018-11-08DOI: 10.30799/JNST.159.18040516
J. Arumugam, A. Raj, A. Irudayaraj
One dimensional Bi2S3 nanorods have been successfully synthesized by a very simple reflux method with different precursor concentration for 2 hours at 180 �C. The as-synthesized Bi2S3 powders were characterized by X-ray diffraction (XRD), high resolution scanning electron microscope (HRSEM), high resolution transmission microscope (HRTEM), UV-Vis spectrometer, Fourier transform infrared (FTIR) spectrometer. X-ray diffraction (XRD) results show that the resulting nanocrystals have an orthorhombic structure. X-ray diffraction patterns indicate a polycrystalline nature and the crystallite sizes seem increase with increase in the concentration. The HRSEM and HRTEM images reveal that the diameter of the nanorods increase with increasing concentration of the precursor. Morphological analysis reveals that the as-prepared Bi2S3 nanorods can be tuned to morphology by varying precursor concentration from 0.01 M to 0.001 M. The bismuth nitrate, which is known to be a linear polymer, plays a critical role as a precursor and a template for the growth of uniform Bi2S3 nanorods. Bi2S3 nanorods are good absorbents of solar radiation and hence can be used in solar cells.
在180℃条件下，采用不同前驱体浓度回流2小时的方法，成功地合成了一维Bi2S3纳米棒。采用x射线衍射仪(XRD)、高分辨率扫描电镜(HRSEM)、高分辨率透射显微镜(HRTEM)、紫外可见光谱仪(UV-Vis)、傅里叶变换红外光谱仪(FTIR)对合成的Bi2S3粉末进行了表征。x射线衍射(XRD)结果表明，所得纳米晶体具有正交结构。x射线衍射图显示其多晶性质，晶粒尺寸随浓度的增加而增大。HRSEM和HRTEM图像显示，纳米棒的直径随着前驱体浓度的增加而增加。形态学分析表明，制备的Bi2S3纳米棒可以通过改变前驱体浓度(0.01 M ~ 0.001 M)来调整形貌。硝酸铋是一种已知的线性聚合物，它作为前驱体和模板对均匀Bi2S3纳米棒的生长起着关键作用。Bi2S3纳米棒对太阳辐射有良好的吸收能力，因此可以用于太阳能电池。
{"title":"Morphology Manipulation and Related Properties of High Crystalline Bi2S3 Nanorods by Reflux Approach","authors":"J. Arumugam, A. Raj, A. Irudayaraj","doi":"10.30799/JNST.159.18040516","DOIUrl":"https://doi.org/10.30799/JNST.159.18040516","url":null,"abstract":"One dimensional Bi2S3 nanorods have been successfully synthesized by a very simple reflux method with different precursor concentration for 2 hours at 180 �C. The as-synthesized Bi2S3 powders were characterized by X-ray diffraction (XRD), high resolution scanning electron microscope (HRSEM), high resolution transmission microscope (HRTEM), UV-Vis spectrometer, Fourier transform infrared (FTIR) spectrometer. X-ray diffraction (XRD) results show that the resulting nanocrystals have an orthorhombic structure. X-ray diffraction patterns indicate a polycrystalline nature and the crystallite sizes seem increase with increase in the concentration. The HRSEM and HRTEM images reveal that the diameter of the nanorods increase with increasing concentration of the precursor. Morphological analysis reveals that the as-prepared Bi2S3 nanorods can be tuned to morphology by varying precursor concentration from 0.01 M to 0.001 M. The bismuth nitrate, which is known to be a linear polymer, plays a critical role as a precursor and a template for the growth of uniform Bi2S3 nanorods. Bi2S3 nanorods are good absorbents of solar radiation and hence can be used in solar cells.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125078721","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}
Pub Date : 2018-10-28DOI: 10.30799/JNST.163.18040513
V. M. Vinosel, S. Anand, S. Pauline
A systematic investigation on the preparation of SnO2 nanosheets using cost effective hydrothermal method was studied. Tetragonal phase SnO2 were synthesized using tin(II)chloride dihydarte and sodium hydroxide as precursor solution with basic water mixing. The synthesized samples were examined by XRD, HRSEM, EDAX, FTIR and UV-visible spectroscopy. The nanocrystalline size and strain of the SnO2 nanosheets have been inspected by Williamson-Hall analysis. The quantum size effect outcomes in spectacular variation in the optical and vibrational appearances of nanostructured materials likened to their bulk counterparts. Nanosheets like optical image were observed in the microscopy studies. Functional tests of SnO2 nanosheets include photocatalytic effect in the degradation of methylene blue (MB). The result revealed that SnO2 nanosheets degraded 84% of MB under UV light illumination. Dielectric studies such as dielectric constant, loss and ac conductivity were determined.
{"title":"Synthesis, Characterization and Efficient Photocatalytic Activity of Hydrothermally Synthesized SnO2 Nanosheets","authors":"V. M. Vinosel, S. Anand, S. Pauline","doi":"10.30799/JNST.163.18040513","DOIUrl":"https://doi.org/10.30799/JNST.163.18040513","url":null,"abstract":"A systematic investigation on the preparation of SnO2 nanosheets using cost effective hydrothermal method was studied. Tetragonal phase SnO2 were synthesized using tin(II)chloride dihydarte and sodium hydroxide as precursor solution with basic water mixing. The synthesized samples were examined by XRD, HRSEM, EDAX, FTIR and UV-visible spectroscopy. The nanocrystalline size and strain of the SnO2 nanosheets have been inspected by Williamson-Hall analysis. The quantum size effect outcomes in spectacular variation in the optical and vibrational appearances of nanostructured materials likened to their bulk counterparts. Nanosheets like optical image were observed in the microscopy studies. Functional tests of SnO2 nanosheets include photocatalytic effect in the degradation of methylene blue (MB). The result revealed that SnO2 nanosheets degraded 84% of MB under UV light illumination. Dielectric studies such as dielectric constant, loss and ac conductivity were determined.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125367743","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}
Pub Date : 2018-10-28DOI: 10.30799/JNST.160.18040515
K. Ramar, A. Ahamed
This study employed a green, eco-friendly and convenient hydrothermal method for the synthesis of stable silver nanoparticles (Ag NPs) using neem (Azadirachta indica A Juss) fruit extract, which also acts as a reducing and capping agents. Since neem fruits has been found to have various medicinal applications, this fruit has been chosen in this paper to obtain Ag NPs. The Ag NPs were characterized by PXRD, UV–Vis diffuse reflectance spectra (DRS), FTIR, FESEM-EDAX, and HRTEM analysis. UV–Vis DRS spectra studies provided sufficient evidences for the formation of Ag NPs. The major role of functional groups present in the synthesis and stabilization of the NPs was obtained from FTIR studies. The PXRD and HRTEM investigations clearly demonstrated the crystalline nature of the NPs. From the HRTEM images, the Ag NPs were found to be spherical and of nearly uniform size with an average size of 13 nm. Further, Ag NPs were subjected to the agar disc diffusion antimicrobial assay (Mueller–Hinton Agar testing) against Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) bacteria. The test results showed the potent antibacterial activity of NPs for Gram-positive bacteria is higher than that the Gram- negative bacteria
{"title":"Hydrothermal Green Synthesis of Silver Nanoparticles using Azadirachta indica A. Juss. Fruit Juice for Potential Antibacterial Activity","authors":"K. Ramar, A. Ahamed","doi":"10.30799/JNST.160.18040515","DOIUrl":"https://doi.org/10.30799/JNST.160.18040515","url":null,"abstract":"This study employed a green, eco-friendly and convenient hydrothermal method for the synthesis of stable silver nanoparticles (Ag NPs) using neem (Azadirachta indica A Juss) fruit extract, which also acts as a reducing and capping agents. Since neem fruits has been found to have various medicinal applications, this fruit has been chosen in this paper to obtain Ag NPs. The Ag NPs were characterized by PXRD, UV–Vis diffuse reflectance spectra (DRS), FTIR, FESEM-EDAX, and HRTEM analysis. UV–Vis DRS spectra studies provided sufficient evidences for the formation of Ag NPs. The major role of functional groups present in the synthesis and stabilization of the NPs was obtained from FTIR studies. The PXRD and HRTEM investigations clearly demonstrated the crystalline nature of the NPs. From the HRTEM images, the Ag NPs were found to be spherical and of nearly uniform size with an average size of 13 nm. Further, Ag NPs were subjected to the agar disc diffusion antimicrobial assay (Mueller–Hinton Agar testing) against Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) bacteria. The test results showed the potent antibacterial activity of NPs for Gram-positive bacteria is higher than that the Gram- negative bacteria","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126012738","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}
Pub Date : 2018-10-28DOI: 10.30799/JNST.158.18040512
P. Geetha, E. S. Ram, N. Anasuya, P. Sarita
Graphene is one of the best conductive materials for developing nanocomposites due to its outstanding electronic properties. Graphene is developed by modified Hummers’ method. Zinc oxide (ZnO) based composites were developed by using different weight percentages (0.1%, 0.5% and 1%) as reinforcement. To enhance the dispersion of graphene in ZnO matrix the synthesis was processed by ultrasonication process. The obtained graphene oxide, ZnO and composites were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM) techniques for structural information, band analysis and surface morphology respectively. The proposed nanocomposites were developed by varying loading percentages 0.1%, 0.5% and 1% weight of graphene. These materials are used in various applications like varistors, energy storage, sensors, super capacitors and so on.
{"title":"Facile Synthesis of Graphene Based ZnO Nanocomposite","authors":"P. Geetha, E. S. Ram, N. Anasuya, P. Sarita","doi":"10.30799/JNST.158.18040512","DOIUrl":"https://doi.org/10.30799/JNST.158.18040512","url":null,"abstract":"Graphene is one of the best conductive materials for developing nanocomposites due to its outstanding electronic properties. Graphene is developed by modified Hummers’ method. Zinc oxide (ZnO) based composites were developed by using different weight percentages (0.1%, 0.5% and 1%) as reinforcement. To enhance the dispersion of graphene in ZnO matrix the synthesis was processed by ultrasonication process. The obtained graphene oxide, ZnO and composites were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM) techniques for structural information, band analysis and surface morphology respectively. The proposed nanocomposites were developed by varying loading percentages 0.1%, 0.5% and 1% weight of graphene. These materials are used in various applications like varistors, energy storage, sensors, super capacitors and so on.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133546724","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}
Pub Date : 2018-10-28DOI: 10.30799/JNST.145.18040514
S. Nagaraja, Sharanabasamma M. Ambalagi, Hajeebaba K. Inamdar, B. Bharathi, D. Mahalesh, M. Prasad, S. Basavaraja, P. Naik
The polymer composites of polyaniline (PANI) with PVDF have been synthesized by polymerization method. The different composites of PANI with PVDF are obtained by adding 0.5, 1, 1.5, 2 and 2.5 N solutions of PVDF during the polymerization to get the PANI/PVDF composites. The synthesized samples of PANI and composite of PANI with PVDF polymer were characterized by using X-Ray diffraction (XRD). The dielectric properties such as dielectric constant, dielectric loss and AC conductivity for the composites of PANI/PVDF at different weight percentages are studied as a function of frequency in the range 5 Hz–35 MHz at ambient temperature. It is found that the dielectric permittivity decreased exponentially at lower frequency region up to 300 Hz and then the dielectric permittivity remains constant at higher frequency region as the frequency increased. It is also observed that the dielectric permittivity increased as the concentration of PVDF in the polymer composite increased as compared to PANI. Further, it is observed that the dielectric loss increased as a weight percentage of PVDF increased in the composite of PANI. In case of AC conductivity as the frequency increased the AC conductivity remains constant up to 6.75 MHz and afterwards it increases as frequency increased. This is due to the increase in charge carriers through the hopping mechanism in the polymer composites. It is also observed that as a weight percentage of PVDF increased the AC conductivity is also increased
{"title":"Synthesis and Characterization of PANI/PVDF Composites for Dielectric and AC Conductivity","authors":"S. Nagaraja, Sharanabasamma M. Ambalagi, Hajeebaba K. Inamdar, B. Bharathi, D. Mahalesh, M. Prasad, S. Basavaraja, P. Naik","doi":"10.30799/JNST.145.18040514","DOIUrl":"https://doi.org/10.30799/JNST.145.18040514","url":null,"abstract":"The polymer composites of polyaniline (PANI) with PVDF have been synthesized by polymerization method. The different composites of PANI with PVDF are obtained by adding 0.5, 1, 1.5, 2 and 2.5 N solutions of PVDF during the polymerization to get the PANI/PVDF composites. The synthesized samples of PANI and composite of PANI with PVDF polymer were characterized by using X-Ray diffraction (XRD). The dielectric properties such as dielectric constant, dielectric loss and AC conductivity for the composites of PANI/PVDF at different weight percentages are studied as a function of frequency in the range 5 Hz–35 MHz at ambient temperature. It is found that the dielectric permittivity decreased exponentially at lower frequency region up to 300 Hz and then the dielectric permittivity remains constant at higher frequency region as the frequency increased. It is also observed that the dielectric permittivity increased as the concentration of PVDF in the polymer composite increased as compared to PANI. Further, it is observed that the dielectric loss increased as a weight percentage of PVDF increased in the composite of PANI. In case of AC conductivity as the frequency increased the AC conductivity remains constant up to 6.75 MHz and afterwards it increases as frequency increased. This is due to the increase in charge carriers through the hopping mechanism in the polymer composites. It is also observed that as a weight percentage of PVDF increased the AC conductivity is also increased","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123252536","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}
Pub Date : 2018-09-14DOI: 10.30799/JNST.151.18040511
B. Venkataramana, S. Sankar, A. Saikumar, B. V. K. Naidu
In the present work, green synthesis of silver nanoparticles (AgNPs) using a natural phytochemical agent has been described. The aqueous latex from Musa paradisiaca peduncle has been utilized as reducing as well as stabilizing agent. The formation of AgNPs was optimized by varying latex and AgNO3 concentrations and finally reaction time. Ultraviolet-visible spectroscopic analysis showed the surface plasmon resonance peak between 350 and 450 nm confirms the formation of silver nanoparticles. X-ray powder diffraction analysis revealed the crystalline nature of AgNPs, Fourier transform infrared spectroscopy analysis revealed that AgNPs were stabilized by polyphenols and other aromatics present in the Musa Paradisiaca peduncle latex, while X-ray energy dispersive spectroscopy confirms the metallic nature. The field emission scanning electron microscopy and high resolution transmission electron microscopy showed the spherical shape of the particles and size distribution of AgNPs measured by dynamic light scattering which are in the range of 40 to 50 nm. The synthesized AgNPs showed photocatalytic activity on the degradation / removal of the methylene blue dye and the antimicrobial activity against Pseudomonas aeruginosa, Staphylococcus aureus and Klebseilla bacterial species.
{"title":"Phytochemical Mediated Synthesis of Silver Nanoparticles using Musa paradisiaca Peduncle Latex and Its Photocatalytic and Antimicrobial Activity","authors":"B. Venkataramana, S. Sankar, A. Saikumar, B. V. K. Naidu","doi":"10.30799/JNST.151.18040511","DOIUrl":"https://doi.org/10.30799/JNST.151.18040511","url":null,"abstract":"In the present work, green synthesis of silver nanoparticles (AgNPs) using a natural phytochemical agent has been described. The aqueous latex from Musa paradisiaca peduncle has been utilized as reducing as well as stabilizing agent. The formation of AgNPs was optimized by varying latex and AgNO3 concentrations and finally reaction time. Ultraviolet-visible spectroscopic analysis showed the surface plasmon resonance peak between 350 and 450 nm confirms the formation of silver nanoparticles. X-ray powder diffraction analysis revealed the crystalline nature of AgNPs, Fourier transform infrared spectroscopy analysis revealed that AgNPs were stabilized by polyphenols and other aromatics present in the Musa Paradisiaca peduncle latex, while X-ray energy dispersive spectroscopy confirms the metallic nature. The field emission scanning electron microscopy and high resolution transmission electron microscopy showed the spherical shape of the particles and size distribution of AgNPs measured by dynamic light scattering which are in the range of 40 to 50 nm. The synthesized AgNPs showed photocatalytic activity on the degradation / removal of the methylene blue dye and the antimicrobial activity against Pseudomonas aeruginosa, Staphylococcus aureus and Klebseilla bacterial species.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128536025","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}
Pub Date : 2018-09-14DOI: 10.30799/JNST.147.18040510
D. Himadri, D. Pranayee, S. Kumar
Quantum dots are nearly spherical nanocrystals that have unique optical property which are in intermediate in size between bulk semiconductor and individual atom. Lead sulphide (PbS) nanoparticles are synthesized by the reaction between lead nitrate and sodium sulphide. This paper proposes a detection method of bacterial sample based on memristic properties of semiconductor quantum dots. In this case, PbS nanoparticle is considered for its good fluorescent property. PbS nanoparticle were synthesized and characterized by UV –visible spectroscopy, PL, XRD, SEM and HRTEM. The antimicrobial activity of Pbs and CdS quantum dots are observed in this paper. The potential application of these quantum dots as a biosensor is examined by conjugating bacterial stain E. coli and S. aureus and examining the current –voltage characteristics with E. coli.
{"title":"Synthesis of PbS Nanoparticles and Its Potential as a Biosensor based on Memristic Properties","authors":"D. Himadri, D. Pranayee, S. Kumar","doi":"10.30799/JNST.147.18040510","DOIUrl":"https://doi.org/10.30799/JNST.147.18040510","url":null,"abstract":"Quantum dots are nearly spherical nanocrystals that have unique optical property which are in intermediate in size between bulk semiconductor and individual atom. Lead sulphide (PbS) nanoparticles are synthesized by the reaction between lead nitrate and sodium sulphide. This paper proposes a detection method of bacterial sample based on memristic properties of semiconductor quantum dots. In this case, PbS nanoparticle is considered for its good fluorescent property. PbS nanoparticle were synthesized and characterized by UV –visible spectroscopy, PL, XRD, SEM and HRTEM. The antimicrobial activity of Pbs and CdS quantum dots are observed in this paper. The potential application of these quantum dots as a biosensor is examined by conjugating bacterial stain E. coli and S. aureus and examining the current –voltage characteristics with E. coli.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130936172","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}
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