Determination of crystallite size, number of graphene layers, interlayer spacing, and defect density with the use of X-ray diffraction and Raman spectroscopic technique. GO was synthesized by using Simple Hummer’s method and was subjected to chemical reduction by using tri-sodium citrate. Particularly, the above parameters have presented by some mathematical equation usage. The shrinkage in the dimensions of crystallite upon reduction leads to decrease in number of graphene layers in each domain and clearly increase the defect density. XRD and Raman stated the formation of GO and its reduction to the formation of RGO.Determination of crystallite size, number of graphene layers, interlayer spacing, and defect density with the use of X-ray diffraction and Raman spectroscopic technique. GO was synthesized by using Simple Hummer’s method and was subjected to chemical reduction by using tri-sodium citrate. Particularly, the above parameters have presented by some mathematical equation usage. The shrinkage in the dimensions of crystallite upon reduction leads to decrease in number of graphene layers in each domain and clearly increase the defect density. XRD and Raman stated the formation of GO and its reduction to the formation of RGO.
{"title":"Determination of crystallite size, number of graphene layers and defect density of graphene oxide (GO) and reduced graphene oxide (RGO)","authors":"Ashish Kaushal, S. Dhawan, Vishal Singh","doi":"10.1063/1.5112945","DOIUrl":"https://doi.org/10.1063/1.5112945","url":null,"abstract":"Determination of crystallite size, number of graphene layers, interlayer spacing, and defect density with the use of X-ray diffraction and Raman spectroscopic technique. GO was synthesized by using Simple Hummer’s method and was subjected to chemical reduction by using tri-sodium citrate. Particularly, the above parameters have presented by some mathematical equation usage. The shrinkage in the dimensions of crystallite upon reduction leads to decrease in number of graphene layers in each domain and clearly increase the defect density. XRD and Raman stated the formation of GO and its reduction to the formation of RGO.Determination of crystallite size, number of graphene layers, interlayer spacing, and defect density with the use of X-ray diffraction and Raman spectroscopic technique. GO was synthesized by using Simple Hummer’s method and was subjected to chemical reduction by using tri-sodium citrate. Particularly, the above parameters have presented by some mathematical equation usage. The shrinkage in the dimensions of crystallite upon reduction leads to decrease in number of graphene layers in each domain and clearly increase the defect density. XRD and Raman stated the formation of GO and its reduction to the formation of RGO.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81556172","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}
This study presents structural, elastic and electronic properties of BNFF-1 using density functional theory (DFT). For obtaining correct ground state structure, two different dispersion corrected methods (Grimme (G06) and Tkatchenko-Scheffler (TS)) along with standard DFT functional have been used. The obtained results with TS functional show less deviation (∼1.2%) than G06 (∼1.7%). This small difference could be due to the relative variation in dispersion coefficients incorporated. The structural parameters from van der Waals (vdW) corrected schemes clearly informs about the role of weak interactions and bond polarizability differences on the structural stability of BNFF-1. The calculated bulk modulus and its pressure derivative using third order birch murnaghan equation of state are 11.43 GPa (17.46 GPa: polycrystalline using Hill approximation) and 8.17 respectively. From the magnitude of bulk modulus we can conclude that BNFF-1 is similar to well known energetic material RDX. The order of compressibility of the lattice parameters obtained from the first order pressure coefficient is c > a > b. The study of elastic constants and the related properties of this material has also been carried out to know the impact and frictional sensitivity of this material. At the end, electronic band structure calculation results at TS level, reveal that, BNFF-1 is a direct band gap (3.02 eV) material along Γ-Γ direction in the first Brillion zone. Overall, the effect of bond polarizability through TS-scheme is well addressed in order to understand the various structure-property correlations.
利用密度泛函理论(DFT)研究了BNFF-1的结构、弹性和电子特性。为了获得正确的基态结构，使用了两种不同的色散校正方法(grime (G06)和Tkatchenko-Scheffler (TS))以及标准DFT泛函。用TS函数得到的结果比G06(~ 1.7%)偏差更小(~ 1.2%)。这种微小的差异可能是由于纳入的分散系数的相对变化。van der Waals (vdW)修正方案的结构参数清楚地说明了弱相互作用和键极化率差异对BNFF-1结构稳定性的作用。利用三阶桦木murnaghan状态方程计算得到的体积模量和压力导数分别为11.43 GPa(希尔近似计算得到的多晶体积模量为17.46 GPa)和8.17 GPa。从体积模量的大小可以得出结论，BNFF-1类似于众所周知的高能材料RDX。由一阶压力系数得到的晶格参数的可压缩性顺序为c > a > b，并对该材料的弹性常数及相关性质进行了研究，以了解该材料的冲击敏感性和摩擦敏感性。最后，TS能级的电子能带结构计算结果表明，BNFF-1在第一brilion区沿Γ-Γ方向为直接带隙(3.02 eV)材料。总的来说，通过ts方案很好地解决了键极化率的影响，以便了解各种结构-性质相关性。
{"title":"Structure-property correlations of bis(nitrofurazano) furazan(BNFF-1): A density functional theory study","authors":"S. Mondal, J. Kumar, E. N. Rao, G. Vaitheeswaran","doi":"10.1063/1.5113230","DOIUrl":"https://doi.org/10.1063/1.5113230","url":null,"abstract":"This study presents structural, elastic and electronic properties of BNFF-1 using density functional theory (DFT). For obtaining correct ground state structure, two different dispersion corrected methods (Grimme (G06) and Tkatchenko-Scheffler (TS)) along with standard DFT functional have been used. The obtained results with TS functional show less deviation (∼1.2%) than G06 (∼1.7%). This small difference could be due to the relative variation in dispersion coefficients incorporated. The structural parameters from van der Waals (vdW) corrected schemes clearly informs about the role of weak interactions and bond polarizability differences on the structural stability of BNFF-1. The calculated bulk modulus and its pressure derivative using third order birch murnaghan equation of state are 11.43 GPa (17.46 GPa: polycrystalline using Hill approximation) and 8.17 respectively. From the magnitude of bulk modulus we can conclude that BNFF-1 is similar to well known energetic material RDX. The order of compressibility of the lattice parameters obtained from the first order pressure coefficient is c > a > b. The study of elastic constants and the related properties of this material has also been carried out to know the impact and frictional sensitivity of this material. At the end, electronic band structure calculation results at TS level, reveal that, BNFF-1 is a direct band gap (3.02 eV) material along Γ-Γ direction in the first Brillion zone. Overall, the effect of bond polarizability through TS-scheme is well addressed in order to understand the various structure-property correlations.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82830402","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}
The Er3+ - Yb 3+ doped TeO2 -WO3- Li2O (TWLEY) ternary doped with and without Ag nanoparticles (NPs) glasses have been synthesized by melt quenching technique. Surface Plasmon resonance bands in the glasses are measured and verified in the range 535-550 nm and 640-650 nm under 488nm laser excitation by lambda scanning technique of the confocal fluorescence microscope. Fluorescence Intensity map of TWLEY and TWLEY03A are observed at 545nm. The Fluorescence Lifetime Imaging Microscopy (FLIM) studies has been conducted for the imaging and lifetime measurement using pulsed laser diode of 405 nm, 6ns,40 MHz of PicoQuant and result are analyzed by decay and lifetime histograms. This work shows that Plasmon enhances photoluminescence of silver and rare-earth doped glasses may be utilized for biomedical imaging.The Er3+ - Yb 3+ doped TeO2 -WO3- Li2O (TWLEY) ternary doped with and without Ag nanoparticles (NPs) glasses have been synthesized by melt quenching technique. Surface Plasmon resonance bands in the glasses are measured and verified in the range 535-550 nm and 640-650 nm under 488nm laser excitation by lambda scanning technique of the confocal fluorescence microscope. Fluorescence Intensity map of TWLEY and TWLEY03A are observed at 545nm. The Fluorescence Lifetime Imaging Microscopy (FLIM) studies has been conducted for the imaging and lifetime measurement using pulsed laser diode of 405 nm, 6ns,40 MHz of PicoQuant and result are analyzed by decay and lifetime histograms. This work shows that Plasmon enhances photoluminescence of silver and rare-earth doped glasses may be utilized for biomedical imaging.
{"title":"Fluorescence imaging of Er3+/Yb3+ codoped tungsten tellurite glasses with silver nanoparticles","authors":"S. K. Mahajan, R. Jain","doi":"10.1063/1.5113104","DOIUrl":"https://doi.org/10.1063/1.5113104","url":null,"abstract":"The Er3+ - Yb 3+ doped TeO2 -WO3- Li2O (TWLEY) ternary doped with and without Ag nanoparticles (NPs) glasses have been synthesized by melt quenching technique. Surface Plasmon resonance bands in the glasses are measured and verified in the range 535-550 nm and 640-650 nm under 488nm laser excitation by lambda scanning technique of the confocal fluorescence microscope. Fluorescence Intensity map of TWLEY and TWLEY03A are observed at 545nm. The Fluorescence Lifetime Imaging Microscopy (FLIM) studies has been conducted for the imaging and lifetime measurement using pulsed laser diode of 405 nm, 6ns,40 MHz of PicoQuant and result are analyzed by decay and lifetime histograms. This work shows that Plasmon enhances photoluminescence of silver and rare-earth doped glasses may be utilized for biomedical imaging.The Er3+ - Yb 3+ doped TeO2 -WO3- Li2O (TWLEY) ternary doped with and without Ag nanoparticles (NPs) glasses have been synthesized by melt quenching technique. Surface Plasmon resonance bands in the glasses are measured and verified in the range 535-550 nm and 640-650 nm under 488nm laser excitation by lambda scanning technique of the confocal fluorescence microscope. Fluorescence Intensity map of TWLEY and TWLEY03A are observed at 545nm. The Fluorescence Lifetime Imaging Microscopy (FLIM) studies has been conducted for the imaging and lifetime measurement using pulsed laser diode of 405 nm, 6ns,40 MHz of PicoQuant and result are analyzed by decay and lifetime histograms. This work shows that Plasmon enhances photoluminescence of silver and rare-earth doped glasses may be utilized for biomedical imaging.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86705451","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}
We report the initial characterization results of spin coated films prepared by blending the optimized concentration of 10 weight % polystyrene in Poly(methyl methacrylate) (PMMA) followed by spin coating on glass. The films are highly transparent with clear evidence of phase separation induced patterning which is a novel observation as this patterning is generally induced when the films are annealed. In contrast, annealing of our film shows mixing of the layers without any bond breakage, resulting in a smooth layer with no presence of patterns anymore.We report the initial characterization results of spin coated films prepared by blending the optimized concentration of 10 weight % polystyrene in Poly(methyl methacrylate) (PMMA) followed by spin coating on glass. The films are highly transparent with clear evidence of phase separation induced patterning which is a novel observation as this patterning is generally induced when the films are annealed. In contrast, annealing of our film shows mixing of the layers without any bond breakage, resulting in a smooth layer with no presence of patterns anymore.
{"title":"Synthesis and initial characterization of PS-PMMA blend film for annealing induced phase mixing study","authors":"S. Tripathi, P. Rao, S. Jha","doi":"10.1063/1.5113135","DOIUrl":"https://doi.org/10.1063/1.5113135","url":null,"abstract":"We report the initial characterization results of spin coated films prepared by blending the optimized concentration of 10 weight % polystyrene in Poly(methyl methacrylate) (PMMA) followed by spin coating on glass. The films are highly transparent with clear evidence of phase separation induced patterning which is a novel observation as this patterning is generally induced when the films are annealed. In contrast, annealing of our film shows mixing of the layers without any bond breakage, resulting in a smooth layer with no presence of patterns anymore.We report the initial characterization results of spin coated films prepared by blending the optimized concentration of 10 weight % polystyrene in Poly(methyl methacrylate) (PMMA) followed by spin coating on glass. The films are highly transparent with clear evidence of phase separation induced patterning which is a novel observation as this patterning is generally induced when the films are annealed. In contrast, annealing of our film shows mixing of the layers without any bond breakage, resulting in a smooth layer with no presence of patterns anymore.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89036741","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}
G. Kiran, Kundrapu Shyam Kumar, A. Yadav, S. Bhattacharyya
Porous mullite was fabricated from kaolin and alumina using naphthalene as a pore-former. For different wt.% of naphthalene addition, the apparent porosity (%) was analysed. The mechanical strength was estimated through flexural strength and diametral tensile strength. Fabricated pellets were sintered at 1400°C, 1500°C, 1600°C to study the effect of pore former on phase formation and porosity distribution through X-Ray diffraction study and FESEM microstructure analysis. The analysis showed 39.79% of porosity in the case of 20wt.% naphthalene addition with flexural strength of 21.93MPa. This pointed towards the application of this product as a membrane support material.Porous mullite was fabricated from kaolin and alumina using naphthalene as a pore-former. For different wt.% of naphthalene addition, the apparent porosity (%) was analysed. The mechanical strength was estimated through flexural strength and diametral tensile strength. Fabricated pellets were sintered at 1400°C, 1500°C, 1600°C to study the effect of pore former on phase formation and porosity distribution through X-Ray diffraction study and FESEM microstructure analysis. The analysis showed 39.79% of porosity in the case of 20wt.% naphthalene addition with flexural strength of 21.93MPa. This pointed towards the application of this product as a membrane support material.
{"title":"Fabrication and characterization of porous mullite ceramics","authors":"G. Kiran, Kundrapu Shyam Kumar, A. Yadav, S. Bhattacharyya","doi":"10.1063/1.5112863","DOIUrl":"https://doi.org/10.1063/1.5112863","url":null,"abstract":"Porous mullite was fabricated from kaolin and alumina using naphthalene as a pore-former. For different wt.% of naphthalene addition, the apparent porosity (%) was analysed. The mechanical strength was estimated through flexural strength and diametral tensile strength. Fabricated pellets were sintered at 1400°C, 1500°C, 1600°C to study the effect of pore former on phase formation and porosity distribution through X-Ray diffraction study and FESEM microstructure analysis. The analysis showed 39.79% of porosity in the case of 20wt.% naphthalene addition with flexural strength of 21.93MPa. This pointed towards the application of this product as a membrane support material.Porous mullite was fabricated from kaolin and alumina using naphthalene as a pore-former. For different wt.% of naphthalene addition, the apparent porosity (%) was analysed. The mechanical strength was estimated through flexural strength and diametral tensile strength. Fabricated pellets were sintered at 1400°C, 1500°C, 1600°C to study the effect of pore former on phase formation and porosity distribution through X-Ray diffraction study and FESEM microstructure analysis. The analysis showed 39.79% of porosity in the case of 20wt.% naphthalene addition with flexural strength of 21.93MPa. This pointed towards the application of this product as a membrane support material.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87985300","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}
S. Dagar, Ashima Hooda, D. Ahlawat, N. Sharma, S. Khasa
Na0.7Bi0.3TiO3 pervoskite were developed through solid state reaction method. The formation of rhombohedral crystal structure was confirmed from the XRD and rietveld refinement. Dielectric properties of the sample were studied in the frequency range 1kHz to 5MHz in temperature range from room temperature to 400°C. Dielectric constant and tangent loss increases with increase in temperature and decrease with increase in frequency for prepared composition. AC conductivity pattern obey Jonscher’s power law and appears nearly constant at lower frequencies and increases at higher frequencies. Dc conductivity and corresponding activation energy for the prepared composition were measured. DC conductivity obeys Arrehenius relation. Dc conductivity and activation energy increases as temperature increases.
{"title":"Structural and dielectric properties of Na0.7Bi0.3TiO3","authors":"S. Dagar, Ashima Hooda, D. Ahlawat, N. Sharma, S. Khasa","doi":"10.1063/1.5112965","DOIUrl":"https://doi.org/10.1063/1.5112965","url":null,"abstract":"Na0.7Bi0.3TiO3 pervoskite were developed through solid state reaction method. The formation of rhombohedral crystal structure was confirmed from the XRD and rietveld refinement. Dielectric properties of the sample were studied in the frequency range 1kHz to 5MHz in temperature range from room temperature to 400°C. Dielectric constant and tangent loss increases with increase in temperature and decrease with increase in frequency for prepared composition. AC conductivity pattern obey Jonscher’s power law and appears nearly constant at lower frequencies and increases at higher frequencies. Dc conductivity and corresponding activation energy for the prepared composition were measured. DC conductivity obeys Arrehenius relation. Dc conductivity and activation energy increases as temperature increases.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87985925","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}
In order to tune the magnetocrystalline anisotropy (MCA) of L10-FeNi by introducing tetragonal distortion, we have investigated FeNi with interstitial C-doping using full-potential approach within generalized gradient approximation (GGA). Our calculations foretell that these structural distortions of FeNi result in a large MCA of 1.88 MJ/m3 at the cost of small suppression in saturation magnetization. Moreover, calculated formation energy also promotes the structural stability of FeNi:C over FeNi. Hence, L10-FeNi:C alloy has the potential to act as opportune rare-earth free permanent magnetic material.
{"title":"Effect of tetragonal distortion induced by interstitial C-doping in L10-FeNi","authors":"P. Rani, J. Thakur, Ankur Taya, M. K. Kashyap","doi":"10.1063/1.5113336","DOIUrl":"https://doi.org/10.1063/1.5113336","url":null,"abstract":"In order to tune the magnetocrystalline anisotropy (MCA) of L10-FeNi by introducing tetragonal distortion, we have investigated FeNi with interstitial C-doping using full-potential approach within generalized gradient approximation (GGA). Our calculations foretell that these structural distortions of FeNi result in a large MCA of 1.88 MJ/m3 at the cost of small suppression in saturation magnetization. Moreover, calculated formation energy also promotes the structural stability of FeNi:C over FeNi. Hence, L10-FeNi:C alloy has the potential to act as opportune rare-earth free permanent magnetic material.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"247 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75907258","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}
Lithium tellurite glasses are fabricated and characterized by density, X-ray diffraction (XRD), thermal analysis, UV-Visible and Raman spectroscopy. Density of glasses decreases with incorporation of MoO3 in lithium tellurite glasses, whereas density increases with the addition of WO3, these changes in density are due to different molar mass of constituents. The introduction of MoO3 and WO3 in lithium tellurite glasses enhances the glass transition temperature and thermal stability. Raman studies revealed that the network structure of the glasses consists of TeO4 and TeO3/TeO3+1 units. The present glass system have potential application for development of laser materials, optical waveguides, and crystal-free optical fibres.Lithium tellurite glasses are fabricated and characterized by density, X-ray diffraction (XRD), thermal analysis, UV-Visible and Raman spectroscopy. Density of glasses decreases with incorporation of MoO3 in lithium tellurite glasses, whereas density increases with the addition of WO3, these changes in density are due to different molar mass of constituents. The introduction of MoO3 and WO3 in lithium tellurite glasses enhances the glass transition temperature and thermal stability. Raman studies revealed that the network structure of the glasses consists of TeO4 and TeO3/TeO3+1 units. The present glass system have potential application for development of laser materials, optical waveguides, and crystal-free optical fibres.
{"title":"Thermal, optical and Raman spectroscopy studies of lithium tellurite glasses containing molybdenum and tungsten ions","authors":"A. Kaur, A. Khanna","doi":"10.1063/1.5113092","DOIUrl":"https://doi.org/10.1063/1.5113092","url":null,"abstract":"Lithium tellurite glasses are fabricated and characterized by density, X-ray diffraction (XRD), thermal analysis, UV-Visible and Raman spectroscopy. Density of glasses decreases with incorporation of MoO3 in lithium tellurite glasses, whereas density increases with the addition of WO3, these changes in density are due to different molar mass of constituents. The introduction of MoO3 and WO3 in lithium tellurite glasses enhances the glass transition temperature and thermal stability. Raman studies revealed that the network structure of the glasses consists of TeO4 and TeO3/TeO3+1 units. The present glass system have potential application for development of laser materials, optical waveguides, and crystal-free optical fibres.Lithium tellurite glasses are fabricated and characterized by density, X-ray diffraction (XRD), thermal analysis, UV-Visible and Raman spectroscopy. Density of glasses decreases with incorporation of MoO3 in lithium tellurite glasses, whereas density increases with the addition of WO3, these changes in density are due to different molar mass of constituents. The introduction of MoO3 and WO3 in lithium tellurite glasses enhances the glass transition temperature and thermal stability. Raman studies revealed that the network structure of the glasses consists of TeO4 and TeO3/TeO3+1 units. The present glass system have potential application for development of laser materials, optical waveguides, and crystal-free optical fibres.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78889400","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}
Monika Nehra, D. Kedia, N. Dilbaghi, A. A. Hassan, Sandeep Kumar
Metal-organic frameworks (MOFs) are the coordination polymers of particular interest for targeted drug delivery in a controlled manner. MOFs have several interesting properties in terms of high por...
{"title":"One-pot synthesis of Cu-based metal-organic frameworks for environmental applications","authors":"Monika Nehra, D. Kedia, N. Dilbaghi, A. A. Hassan, Sandeep Kumar","doi":"10.1063/1.5113041","DOIUrl":"https://doi.org/10.1063/1.5113041","url":null,"abstract":"Metal-organic frameworks (MOFs) are the coordination polymers of particular interest for targeted drug delivery in a controlled manner. MOFs have several interesting properties in terms of high por...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80082965","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}
Prior reduction of Ag+ to Ag° in the NVP dispersed in the solvent, dimethyl formamide (DMF) complex and the subsequent addition of HAuCl4 to the mixture results in the galvanic replacement reaction, wherein the Ag nanoparticles acts as a template site for effective reduction of Au3+ to Au° augmented through NVP, thereby resulting in pure single phase Ag-Au alloy nanoparticles. Single sharp LSPR peaks for various fractional mole compositions of Ag and Au were observed between 435 to 515 nm, with the absorption peak blue shifting linearly with increase in the mole fraction of Au. The structural morphology of the alloy nanostructure was confirmed using TEM. The catalytic properties of the as-synthesized Ag-Au alloy nanoparticles were studied using the reduction process of 4-Nitro-Aniline (NA) to p-phenylenediamine (p-PDA) using NaBH4. It was found that the reduction rate of 4-NitroAniline varies with the mole composition of Ag and Au in the alloy nanostructure.
{"title":"Facile synthesis of Ag-Au nano-alloys and their catalytic applications","authors":"M. B. Newmai, A. Dahiya, P. Kumar","doi":"10.1063/1.5112972","DOIUrl":"https://doi.org/10.1063/1.5112972","url":null,"abstract":"Prior reduction of Ag+ to Ag° in the NVP dispersed in the solvent, dimethyl formamide (DMF) complex and the subsequent addition of HAuCl4 to the mixture results in the galvanic replacement reaction, wherein the Ag nanoparticles acts as a template site for effective reduction of Au3+ to Au° augmented through NVP, thereby resulting in pure single phase Ag-Au alloy nanoparticles. Single sharp LSPR peaks for various fractional mole compositions of Ag and Au were observed between 435 to 515 nm, with the absorption peak blue shifting linearly with increase in the mole fraction of Au. The structural morphology of the alloy nanostructure was confirmed using TEM. The catalytic properties of the as-synthesized Ag-Au alloy nanoparticles were studied using the reduction process of 4-Nitro-Aniline (NA) to p-phenylenediamine (p-PDA) using NaBH4. It was found that the reduction rate of 4-NitroAniline varies with the mole composition of Ag and Au in the alloy nanostructure.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"116 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83473887","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：