Pub Date : 2018-09-04DOI: 10.30799/JNST.149.18040509
B. Prashanti, T. Damodharam
A facile synthesis of graphene oxide-copper oxide nanocomposite (GO-CuO) was performed by using wet chemical method of graphene oxide and copper acetate precursors. The nanocomposite was characterized and intercalated with Raman spectroscopy, FE-SEM, TEM, SAED and EDAX. The crystalline nature was studied from P-XRD. Photocatalytic degradation of palladium ion was studied by using UV-VIS spectrophotometer. Significant high-performance photocatalytic activity of GO-CuO nanocomposite was exhibited on palladium ions degradation under solar light.
{"title":"Fabrication of Graphene–CuO Nanocomposite with Improved Photocatalytic Degradation for Palladium Solution under Solar Light Irradiation","authors":"B. Prashanti, T. Damodharam","doi":"10.30799/JNST.149.18040509","DOIUrl":"https://doi.org/10.30799/JNST.149.18040509","url":null,"abstract":"A facile synthesis of graphene oxide-copper oxide nanocomposite (GO-CuO) was performed by using wet chemical method of graphene oxide and copper acetate precursors. The nanocomposite was characterized and intercalated with Raman spectroscopy, FE-SEM, TEM, SAED and EDAX. The crystalline nature was studied from P-XRD. Photocatalytic degradation of palladium ion was studied by using UV-VIS spectrophotometer. Significant high-performance photocatalytic activity of GO-CuO nanocomposite was exhibited on palladium ions degradation under solar light.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130051511","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 : 2018-08-31DOI: 10.30799/JNST.157.18040507
G. Satyanarayana, G. N. Rao, K. V. Babu
Ferrite materials with the general formula Ni0.7Zn0.2Cu0.1Fe1.9M0.1O4 (M=Al and Cr) are synthesized by using the solid state reaction method. X-ray diffraction (XRD), Fourier transforms infrared (FTIR) spectra, scanning electron microscope (SEM) dielectric measurements and vibrating sample magnetometer (VSM) techniques are utilized to study the various properties of the synthesized ferrites. XRD analysis confirmed the formation of single phase cubic spinel structure and the crystallite size is calculated by Scherrer’s formula found to be 20.3 and 12.5 nm. The magnetic properties were studied using pulse field hysteresis loop technique at room temperature. The saturation magnetization exhibit 98.71 and 91.69 emu/g for Al3+ and Cr3+ substituted Ni-Zn-Cu ferrites respectively. The magnetic permeability is increasing for chromium substituted compound in the frequency range 100 Hz to 120 MHz and significant modification in DC conductivity is explained on the basis of hopping mechanism.
{"title":"Structural, Dielectric and Magnetic Properties of Al3+ and Cr3+ Substituted Ni-Zn-Cu Ferrites","authors":"G. Satyanarayana, G. N. Rao, K. V. Babu","doi":"10.30799/JNST.157.18040507","DOIUrl":"https://doi.org/10.30799/JNST.157.18040507","url":null,"abstract":"Ferrite materials with the general formula Ni0.7Zn0.2Cu0.1Fe1.9M0.1O4 (M=Al and Cr) are synthesized by using the solid state reaction method. X-ray diffraction (XRD), Fourier transforms infrared (FTIR) spectra, scanning electron microscope (SEM) dielectric measurements and vibrating sample magnetometer (VSM) techniques are utilized to study the various properties of the synthesized ferrites. XRD analysis confirmed the formation of single phase cubic spinel structure and the crystallite size is calculated by Scherrer’s formula found to be 20.3 and 12.5 nm. The magnetic properties were studied using pulse field hysteresis loop technique at room temperature. The saturation magnetization exhibit 98.71 and 91.69 emu/g for Al3+ and Cr3+ substituted Ni-Zn-Cu ferrites respectively. The magnetic permeability is increasing for chromium substituted compound in the frequency range 100 Hz to 120 MHz and significant modification in DC conductivity is explained on the basis of hopping mechanism.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129566588","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 : 2018-08-31DOI: 10.30799/JNST.153.18040508
Sonali Samantra, S. S. Ray
The synthesis of metallic nanoparticles is an active area of academic and application research in nanotechnology. It is also an amalgamating technology which has fascinating multi-disciplinary application in various sections. Nanoparticles has been a conventional but field if we go on further decreasing the size we enter the field of quantum dots (<10 nm) with application in the form of tracers, labels, sensors etc. Molybdenum disulfide and tantalum nanoparticles were synthesized and characterized through FESEM, FTIR, XRD,UV-Vis spectroscopy, spectrofluorimetry, etc. The size of the synthesized nanoparticles as observed in FESEM were found to be in the range of 22 to 50 nm for molybdenum nanoparticle and 34.72 to 72.45 nm in case of tantalum. The EDAX analysis shows the composition of molybdenum nanoparticle as hydrogen(H), molybdenum(Mo), nitrogen(N), oxygen(O) and fluorine(F) with 32.3%, 66.3%, 0.43%, 0.32% and 0.5% respectively. The EDAX analysis show the composition of tantalum nanoparticle as hydrogen(H), tantalum(Ta), oxygen(O), nitrogen(N) and fluorine(F) with 35.9%,50%,4.8%,2.01%,7.17%. The XRD analysis of molybdenum disulfide images indicates the synthesized nanoparticle as crystalline in nature. The average crystallinity was found to be 7.93 nm. Tantalum nanoparticles with a crystallinity of 8.05 and 12.20 nm were observed as [2 0 0] and [1 1 0] planes. Biocompatibility of the synthesized nanoparticles was examined by MTT assay. The spectrofluorometry of the synthesized nanoparticles proves the fluorescence property which is most probably because of the quantum dots. Furthermore, the fluorescence property was also used for the cell imaging. The study is a first its kind to exercise the use of Mo and Ta quantum dots in the field of biomedical application and further work is necessary for optimization and implementation of the nanoparticles in the biological sector.
{"title":"Heterogeneous Mixture of Nanoparticles from MoS2 and Ta2O5: Synthesis and Characterization","authors":"Sonali Samantra, S. S. Ray","doi":"10.30799/JNST.153.18040508","DOIUrl":"https://doi.org/10.30799/JNST.153.18040508","url":null,"abstract":"The synthesis of metallic nanoparticles is an active area of academic and application research in nanotechnology. It is also an amalgamating technology which has fascinating multi-disciplinary application in various sections. Nanoparticles has been a conventional but field if we go on further decreasing the size we enter the field of quantum dots (<10 nm) with application in the form of tracers, labels, sensors etc. Molybdenum disulfide and tantalum nanoparticles were synthesized and characterized through FESEM, FTIR, XRD,UV-Vis spectroscopy, spectrofluorimetry, etc. The size of the synthesized nanoparticles as observed in FESEM were found to be in the range of 22 to 50 nm for molybdenum nanoparticle and 34.72 to 72.45 nm in case of tantalum. The EDAX analysis shows the composition of molybdenum nanoparticle as hydrogen(H), molybdenum(Mo), nitrogen(N), oxygen(O) and fluorine(F) with 32.3%, 66.3%, 0.43%, 0.32% and 0.5% respectively. The EDAX analysis show the composition of tantalum nanoparticle as hydrogen(H), tantalum(Ta), oxygen(O), nitrogen(N) and fluorine(F) with 35.9%,50%,4.8%,2.01%,7.17%. The XRD analysis of molybdenum disulfide images indicates the synthesized nanoparticle as crystalline in nature. The average crystallinity was found to be 7.93 nm. Tantalum nanoparticles with a crystallinity of 8.05 and 12.20 nm were observed as [2 0 0] and [1 1 0] planes. Biocompatibility of the synthesized nanoparticles was examined by MTT assay. The spectrofluorometry of the synthesized nanoparticles proves the fluorescence property which is most probably because of the quantum dots. Furthermore, the fluorescence property was also used for the cell imaging. The study is a first its kind to exercise the use of Mo and Ta quantum dots in the field of biomedical application and further work is necessary for optimization and implementation of the nanoparticles in the biological sector.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134411535","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 : 2018-08-31DOI: 10.30799/JNST.155.18040506
K. Bera, S. Saha, P. Jana
In this work, we have fabricated dye-sensitized solar cell (DSSC) based on chemically grown ZnS nanoparticles with three different source of dye namely Gerbera jamesonii, Rosa indica and Acalypha wilkesiana leaves extract. Anthocyanin, a kind of natural dye found in the leaves of plants and flowers was used as photosensitizers in preparing dye-sensitized solar cell. The optical properties of anthocyanin present in three dyes were also studied. Morphological properties have been studied by atomic force microscopy on ZnS film as well as on ZnS film with dye. The current-voltage characteristics of the dye-sensitized solar cell had been studied in light condition. The DSSC is characterized by the measurement of open circuit voltage, short circuit current density; efficiency and fill factor. The efficiency of three dye solar cell is different and it is maximum for Acalypha wilkesiana leaves extract dye.
{"title":"Fabrication and Characterization of Dye-Sensitized Solar Cell using Chemically Grown ZnS Nanoparticles","authors":"K. Bera, S. Saha, P. Jana","doi":"10.30799/JNST.155.18040506","DOIUrl":"https://doi.org/10.30799/JNST.155.18040506","url":null,"abstract":"In this work, we have fabricated dye-sensitized solar cell (DSSC) based on chemically grown ZnS nanoparticles with three different source of dye namely Gerbera jamesonii, Rosa indica and Acalypha wilkesiana leaves extract. Anthocyanin, a kind of natural dye found in the leaves of plants and flowers was used as photosensitizers in preparing dye-sensitized solar cell. The optical properties of anthocyanin present in three dyes were also studied. Morphological properties have been studied by atomic force microscopy on ZnS film as well as on ZnS film with dye. The current-voltage characteristics of the dye-sensitized solar cell had been studied in light condition. The DSSC is characterized by the measurement of open circuit voltage, short circuit current density; efficiency and fill factor. The efficiency of three dye solar cell is different and it is maximum for Acalypha wilkesiana leaves extract dye.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115137124","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 : 2018-08-30DOI: 10.30799/JNST.152.18040505
L. Prakash, C. Tirupathi
Pure and rare-earth metal Gd doped SnO2-CuO nanoparticles were successfully prepared from the starting materials SnCl2, CuCl2 and doping element gadolinium nitrate. Pure and Gd doped SnO2-CuO were synthesized by co-precipitation method. The samples were characterized using X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), UV-Vis, SEM, EDX and dielectric studies. The XRD analysis reveals that the rare-earth metal Gd dopants were substituted into rutile SnO2-CuO nanoparticles. Pure SnO2-CuO nanoparticles have an average crystallite size of 15 nm and rare-earth metal Gd doped SnO2-CuO nanoparticles have 18 nm. The average crystallite size of the sample increases when dopant was used and XRD peak intensity also increases when compared to pure SnO2-CuO nanoparticles. The optical absorption measurements exposed the nanometric size of the materials influences the energy band gap. Optical band gap was found to be 5.08 eV for pure SnO2-CuO nanoparticles and 5.14 eV for Gd doped SnO2-CuO nanoparticles. Surface morphology of pure and Gd doped SnO2-CuO nanoparticles annealed at 400 °C shows that most of the particles are rod shaped and hence it may have better sensitivity. Dielectric constant and dielectric loss decrease with increasing frequency at 100 °C and 200 °C. Doped samples show larger dielectric properties than pure SnO2-CuO nanoparticles.
{"title":"Synthesis and Characterization of Pure and Rare-Earth Metal Gd Doped SnO2-CuO Nanoparticles by Co-Precipitation Method","authors":"L. Prakash, C. Tirupathi","doi":"10.30799/JNST.152.18040505","DOIUrl":"https://doi.org/10.30799/JNST.152.18040505","url":null,"abstract":"Pure and rare-earth metal Gd doped SnO2-CuO nanoparticles were successfully prepared from the starting materials SnCl2, CuCl2 and doping element gadolinium nitrate. Pure and Gd doped SnO2-CuO were synthesized by co-precipitation method. The samples were characterized using X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), UV-Vis, SEM, EDX and dielectric studies. The XRD analysis reveals that the rare-earth metal Gd dopants were substituted into rutile SnO2-CuO nanoparticles. Pure SnO2-CuO nanoparticles have an average crystallite size of 15 nm and rare-earth metal Gd doped SnO2-CuO nanoparticles have 18 nm. The average crystallite size of the sample increases when dopant was used and XRD peak intensity also increases when compared to pure SnO2-CuO nanoparticles. The optical absorption measurements exposed the nanometric size of the materials influences the energy band gap. Optical band gap was found to be 5.08 eV for pure SnO2-CuO nanoparticles and 5.14 eV for Gd doped SnO2-CuO nanoparticles. Surface morphology of pure and Gd doped SnO2-CuO nanoparticles annealed at 400 °C shows that most of the particles are rod shaped and hence it may have better sensitivity. Dielectric constant and dielectric loss decrease with increasing frequency at 100 °C and 200 °C. Doped samples show larger dielectric properties than pure SnO2-CuO nanoparticles.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125416635","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 : 2018-08-20DOI: 10.30799/JNST.127.18040503
Pawan Kumar, B. S. Dehiya, A. Sindhu, Vinod Kumar
In this paper, we are addressing the development of new composition (60%SiO2-30%CaO-10%P2O5) of biodegradable and biocompatible bioglass (nBG) nanoparticles. The bioglass nanoparticles have been fabricated by sol-gel method. To get functionalized bioglass nanoparticles, they were treated with lysozyme (1 mg/mL) for 48 h. Morphology of nanoparticles, such as structure, particle size, and surface topography were studied by TEM. Bioglass nanoparticles generate hydroxyapatite layer when nanoparticles treated with simulated body fluid (SBF) for 7 days. The presence of bioglass and hydroxyapatite phases confirmed by XRD. TEM images revealed irregular shaped with slightly agglomeration of nanoparticles in nanometer range (200 to 500 nm). The in-vitro biodegradation of nanoparticles was confirmed by weight loss in the presence of SBF. The cytotoxicity effects and cell proliferation of respective sample were investigated through MTT assay. BET results revealed average surface area (10.4 m2/g) of nanoparticles. The nano range of particles will provide better surface to volume ratio over micro or macro particles which makes them more effective so they are often able to react rapidly.
{"title":"Synthesis and Characterization of Nano Bioglass for the Application of Bone Tissue Engineering","authors":"Pawan Kumar, B. S. Dehiya, A. Sindhu, Vinod Kumar","doi":"10.30799/JNST.127.18040503","DOIUrl":"https://doi.org/10.30799/JNST.127.18040503","url":null,"abstract":"In this paper, we are addressing the development of new composition (60%SiO2-30%CaO-10%P2O5) of biodegradable and biocompatible bioglass (nBG) nanoparticles. The bioglass nanoparticles have been fabricated by sol-gel method. To get functionalized bioglass nanoparticles, they were treated with lysozyme (1 mg/mL) for 48 h. Morphology of nanoparticles, such as structure, particle size, and surface topography were studied by TEM. Bioglass nanoparticles generate hydroxyapatite layer when nanoparticles treated with simulated body fluid (SBF) for 7 days. The presence of bioglass and hydroxyapatite phases confirmed by XRD. TEM images revealed irregular shaped with slightly agglomeration of nanoparticles in nanometer range (200 to 500 nm). The in-vitro biodegradation of nanoparticles was confirmed by weight loss in the presence of SBF. The cytotoxicity effects and cell proliferation of respective sample were investigated through MTT assay. BET results revealed average surface area (10.4 m2/g) of nanoparticles. The nano range of particles will provide better surface to volume ratio over micro or macro particles which makes them more effective so they are often able to react rapidly.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130959881","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 : 2018-08-20DOI: 10.30799/JNST.144.18040504
K. Latha, C. Prema, S. Sundar
The present work reports the synthesis and characterization of cobalt oxide nanoparticles. Microwave oven method was used for synthesizing cobalt oxide nanoparticles. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, photoluminescence (PL) and scanning electron microscope (SEM). The prepared samples show poor crystalline nature so that the samples were calcined at 300 °C for 1 hr. The calcined samples were characterized for further changes in its morphology. XRD identifies the sample is in Co3O4 phase with face-centered cubic structure. Debye-Scherer formula was used to calculate the average crystallite size of the annealed sample and it was found to be 7 to 28 nm. In addition to crystallite size, specific surface area, dislocation density and microstrain are calculated using XRD. Williamson-Hall plot was used to calculate the size and strain. FT-IR spectrum shows two stretching bands at 660 and 550 cm−1 which confirm the functional group present in the cobalt oxide nanoparticles. In optical absorption studies, a blue shift in the energy band gap reveals the quantum confinement effect. Photoluminescence spectra shows emission peak in the visible region.
{"title":"Synthesis and Characterization of Cobalt Oxide Nanoparticles","authors":"K. Latha, C. Prema, S. Sundar","doi":"10.30799/JNST.144.18040504","DOIUrl":"https://doi.org/10.30799/JNST.144.18040504","url":null,"abstract":"The present work reports the synthesis and characterization of cobalt oxide nanoparticles. Microwave oven method was used for synthesizing cobalt oxide nanoparticles. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, photoluminescence (PL) and scanning electron microscope (SEM). The prepared samples show poor crystalline nature so that the samples were calcined at 300 °C for 1 hr. The calcined samples were characterized for further changes in its morphology. XRD identifies the sample is in Co3O4 phase with face-centered cubic structure. Debye-Scherer formula was used to calculate the average crystallite size of the annealed sample and it was found to be 7 to 28 nm. In addition to crystallite size, specific surface area, dislocation density and microstrain are calculated using XRD. Williamson-Hall plot was used to calculate the size and strain. FT-IR spectrum shows two stretching bands at 660 and 550 cm−1 which confirm the functional group present in the cobalt oxide nanoparticles. In optical absorption studies, a blue shift in the energy band gap reveals the quantum confinement effect. Photoluminescence spectra shows emission peak in the visible region.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115793583","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 : 2018-08-07DOI: 10.30799/JNST.146.18040502
S. Botsa, D. Ramadevi, K. Basavaiah
In the recent years, green synthesis of nanomaterials has received a great attention to researchers in worldwide due to eco-friendly and scalable synthesis. Here, we report a green synthesis of copper oxide (CuO) nanorods via sonochemical assisted approach. The crystalline structure, band gap and morphology of as prepared CuO nanorods were investigated by UV-Vis diffuse reflectance (UV-Vis/DRS), Fourier Transform infrared spectroscopy, powder X-Ray diffraction (XRD) pattern and scanning electron microscopy (FESEM-EDX). The bandgap of as prepared CuO nanorods was found to be 2.0 eV, which is fall in the visible region of solar spectrum. FTIR demonstrated that there is strong interaction between Cu and oxygen in prepared CuO. XRD results reveal the formation of phase pure and crystalline CuO. FESEM images clearly show the rod like morphology of CuO and the presence of elemental copper and oxygen in EDX, confirms the formation of CuO. The photocatalytic degradation activity of CuO nanorods was examined against a model dye pollutant, nitrobenzene (NB) under visible light irradiation. CuO nanorods were effectively degraded the NB under visible light irradiation. CuO nanorods acts as potent and shows enhanced antimicrobial agent against pathogenic fungi, Candida albicans and bacteria, Escherichia coli.
{"title":"A Facile Synthesis of Copper Oxide Nanorods for Photocatalytic Degradation of Organic Pollutant and Inactivation of Pathogens","authors":"S. Botsa, D. Ramadevi, K. Basavaiah","doi":"10.30799/JNST.146.18040502","DOIUrl":"https://doi.org/10.30799/JNST.146.18040502","url":null,"abstract":"In the recent years, green synthesis of nanomaterials has received a great attention to researchers in worldwide due to eco-friendly and scalable synthesis. Here, we report a green synthesis of copper oxide (CuO) nanorods via sonochemical assisted approach. The crystalline structure, band gap and morphology of as prepared CuO nanorods were investigated by UV-Vis diffuse reflectance (UV-Vis/DRS), Fourier Transform infrared spectroscopy, powder X-Ray diffraction (XRD) pattern and scanning electron microscopy (FESEM-EDX). The bandgap of as prepared CuO nanorods was found to be 2.0 eV, which is fall in the visible region of solar spectrum. FTIR demonstrated that there is strong interaction between Cu and oxygen in prepared CuO. XRD results reveal the formation of phase pure and crystalline CuO. FESEM images clearly show the rod like morphology of CuO and the presence of elemental copper and oxygen in EDX, confirms the formation of CuO. The photocatalytic degradation activity of CuO nanorods was examined against a model dye pollutant, nitrobenzene (NB) under visible light irradiation. CuO nanorods were effectively degraded the NB under visible light irradiation. CuO nanorods acts as potent and shows enhanced antimicrobial agent against pathogenic fungi, Candida albicans and bacteria, Escherichia coli.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115120581","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 : 2018-08-04DOI: 10.30799/JNST.143.18040501
S. Velusubhash, K. Kalirajan, S. Harikengaram, R. Vettumperumal, R. Murugesan, A. Rajarajeswari
In the present work, solution based simple chemical precipitation method has been employed to prepare undoped, cobalt (Co)-doped and cobalt, nickel (Co, Ni) co-doped ZnS quantum dots (QDs). The XRD pattern revealed that all samples displayed cubic zinc blende structure. The average crystallite size of as prepared ZnS QDs were found to be in 1.0 to 1.4 nm range. Surface morphological of synthesized samples were recorded and some distinction in morphological features between undoped, doped and co-doped ZnS QDs were noticed. EDX analysis confirms the presence of all corresponding elements in the samples. The blue-shift in the absorption spectra was observed. The optical band gap energy (Eg) for all the hybrid ZnS QDs samples were evaluated by using UV-Visible optical absorption spectral data. In PL analysis, emission band at 660 nm was found to be quenched as ZnS QDs interact with dopant and co-dopant. Electrochemical analysis was carried out by transition of photogenerated electrons in undoped, cobalt (Co)-doped and cobalt, nickel (Co, Ni) co-doped ZnS QDs modified glassy carbon electrodes. To authenticate the results of PL and electrochemical studies, photocatalytic behaviour of QDs were studied and positive impact of doping and co-doping process on photo degradation were noticed and discussed.
{"title":"Influence of Co-Dopant on Structural, Optical and Electrochemical Properties of Zinc Sulphide Quantum Dots","authors":"S. Velusubhash, K. Kalirajan, S. Harikengaram, R. Vettumperumal, R. Murugesan, A. Rajarajeswari","doi":"10.30799/JNST.143.18040501","DOIUrl":"https://doi.org/10.30799/JNST.143.18040501","url":null,"abstract":"In the present work, solution based simple chemical precipitation method has been employed to prepare undoped, cobalt (Co)-doped and cobalt, nickel (Co, Ni) co-doped ZnS quantum dots (QDs). The XRD pattern revealed that all samples displayed cubic zinc blende structure. The average crystallite size of as prepared ZnS QDs were found to be in 1.0 to 1.4 nm range. Surface morphological of synthesized samples were recorded and some distinction in morphological features between undoped, doped and co-doped ZnS QDs were noticed. EDX analysis confirms the presence of all corresponding elements in the samples. The blue-shift in the absorption spectra was observed. The optical band gap energy (Eg) for all the hybrid ZnS QDs samples were evaluated by using UV-Visible optical absorption spectral data. In PL analysis, emission band at 660 nm was found to be quenched as ZnS QDs interact with dopant and co-dopant. Electrochemical analysis was carried out by transition of photogenerated electrons in undoped, cobalt (Co)-doped and cobalt, nickel (Co, Ni) co-doped ZnS QDs modified glassy carbon electrodes. To authenticate the results of PL and electrochemical studies, photocatalytic behaviour of QDs were studied and positive impact of doping and co-doping process on photo degradation were noticed and discussed.","PeriodicalId":268157,"journal":{"name":"Volume 4,Issue 5,2018","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115561357","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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