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Sol-Gel synthesis, structural characterizations, photo- catalytic degradation for H2 production and UV-Absorption of yttrium-substituted Co-Zn ferrite nanoparticles 溶胶-凝胶合成,结构表征,光催化降解制氢和钇取代钴锌铁氧体纳米颗粒的紫外吸收
Pub Date : 2021-01-01 DOI: 10.1063/5.0061089
Pradip D. Patil, R. Parlikar, M. V. Khedkar, A. V. Raut, K. M. Jadhav, R. Kavade
An effect of trivalent yttrium ion substitution on the structural properties of Co-Zn ferrite has been studied after the fabrication of Co1-xZnxFe2-yYyO4 nanoparticles at a typical concentration (x=0.3, y=0.2). The synthesis of Co1-xZnxFe2-yYyO4 nanoparticles was carried out via sol-gel auto-combustion technique using the citric acid as a fuel with a metal nitrate to citrate ratio of 1:3. X-ray diffraction studies of Co1-xZnxFe2-yYyO4 nanoparticles were carried out to study the structural parameter and phase purity. In this study, the XRD pattern revealed the presence of Bragg’s reflections belongs to the cubic spinel structure. The Y3+ ion doping creates additional phases in the Co-Zn ferrite, which plays a crucial role in controlling the physicochemical properties of the typical samples. The crystallite size (t) was estimated using Debye-Scherrer’s formula and reported to be decreased as a result of Y3+ ionic exchange as per the expectations. Y3+ ion substituted Co-Zn ferrite (with Y content = 0.02 per formula unit) may be considered for an attenuation application in the particular range. Visible range light was used for the photocatalytic degradation measurements using methylene Blue dye. In particular, an enhanced degradation efficiency of Co1-xZnxFe2-yYyO4 nanoparticles was observed. The UV-vis spectroscopic studies were performed and reported in the wavelength range 220 400 nm to check the absorbance of methylene blue dye at different time intervals.
在典型浓度(x=0.3, y=0.2)下制备了Co1-xZnxFe2-yYyO4纳米粒子,研究了三价钇离子取代对Co-Zn铁氧体结构性能的影响。以柠檬酸为燃料,硝酸金属与柠檬酸盐的比例为1:3,采用溶胶-凝胶自燃烧技术合成了Co1-xZnxFe2-yYyO4纳米颗粒。通过x射线衍射研究了Co1-xZnxFe2-yYyO4纳米颗粒的结构参数和相纯度。在本研究中,XRD图显示布拉格反射的存在属于立方尖晶石结构。Y3+离子的掺杂在Co-Zn铁氧体中产生了额外的相,这对控制典型样品的物理化学性质起着至关重要的作用。使用Debye-Scherrer公式估计晶体尺寸(t),并根据预期报告由于Y3+离子交换而减小。Y3+离子取代的Co-Zn铁氧体(每公式单位Y含量= 0.02)可考虑用于特定范围内的衰减应用。采用可见光对亚甲基蓝染料进行光催化降解测定。特别是,观察到Co1-xZnxFe2-yYyO4纳米颗粒的降解效率提高。在220 ~ 400 nm波长范围内对亚甲基蓝染料进行了紫外可见光谱研究,考察了亚甲基蓝染料在不同时间间隔内的吸光度。
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引用次数: 1
PEG-600: Greensolvent for synthesis of pyrazolo[5,1-c]thieno[3,4-e][1,2,4]triazin-6-amine PEG-600:合成吡唑[5,1-c]噻吩[3,4-e][1,2,4]三嗪-6-胺的绿色溶剂
Pub Date : 2021-01-01 DOI: 10.1063/5.0060858
S. R. Bireddy, Venkata Ramana Reddy Chittireddy, L. Eppakayala
Using polyethylene glycol (PEG-600) as a reaction medium for the synthesis of 3, the green, onepot, multicomponent method was developed. Tandem-prepared compound 3 with excellent yields, without isolation of intermediates in situ. Thus, using PEG-600 as a solvent, novel Pyrazolo[5,1-c]thieno[3,4e][1,2,4]triazine-6-amine(3) products have been prepared with new synthetic routes and techniques.
以聚乙二醇(PEG-600)为反应介质,开发了绿色、一锅、多组分合成3的方法。串联制备化合物3,产率高,无需原位分离中间体。因此,以PEG-600为溶剂,以新的合成路线和工艺制备了新型吡唑[5,1-c]噻吩[3,4e][1,2,4]三嗪-6-胺(3)衍生物。
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引用次数: 0
Annealing time and temperature dependent morphological and optical properties of dip coated TiO2 thin films 浸涂TiO2薄膜的形貌和光学性质随退火时间和温度的变化
Pub Date : 2021-01-01 DOI: 10.1063/5.0061273
S. Biswas, A. Kar
Anatase TiO2 thin films were deposited on ITO coated glass substrates via hydrothermal assisted sol gel dip coating method and the change in their morphological and optical properties were observed as a function of annealing time and temperature. All the samples showed densely packed spherical or almost spherical nanoparticles that tended to become more irregular and agglomerated as annealing time and temperature were increased. This also led to decreased values of transmittance with increasing annealing time and temperature. Both refractive indices and extinction coefficient increased with increasing annealing time and temperature. Annealing at higher temperature and for longer time decreases non-stoichiometric lattice sites leading to less non-radiative recombination and higher PL intensity.
采用水热辅助溶胶-凝胶浸渍法在ITO涂层玻璃基底上沉积锐钛矿型TiO2薄膜,观察了其形貌和光学性能随退火时间和温度的变化。随着退火时间和退火温度的升高,纳米颗粒呈球状或近似球形排列,呈不规则和团聚的趋势。这也导致透光率随退火时间和温度的增加而降低。折射率和消光系数随退火时间和温度的增加而增加。在较高的温度和较长的退火时间降低了非化学计量晶格位,导致较少的非辐射复合和更高的PL强度。
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引用次数: 0
Structural, morphological and optoelectronic properties of screen-printed film deposited using Sb2Se3 nanowires Sb2Se3纳米线丝网印刷薄膜的结构、形态及光电性能
Pub Date : 2021-01-01 DOI: 10.1063/5.0060953
Sushil Kumar, Parly, Riya, M. Saravanan, U. Deshpande, R. Venkatesh
Structural, morphological and Optoelectronic properties of Sb2Se3 film prepared by optimized screen-printing method is investigated and presented in this work. Sb2Se3 nanowires synthesized by microwave assisted solvothermal method along with ethylene glycol is used as the ink for the preparation of Sb2Se3screen printed film. Structural analysis confirms the orthorhombic phase while the energy dispersive spectroscopy confirms the formation of Sb2Se3 composition. Crystallite size of the nanocrystalline powder (film) is found to be 60nm (104nm). The surface morphological properties as investigated from field emission scanning electron microscope (FESEM) show that the film is covered with nanowires of length 1-3μm and diameter 100-200nm uniformly distributed over the substrate but agglomerated uniformly as a spherical particle with diameter of ~0.8μm.Interestingly, optoelectronic properties of the film and nanocrystalline powder show a band gap value of 1.19eV and 1.22eV respectively with an infinitesimal change in the band gap of the order of 0.03eV which is in correspondence with the morphological properties.Sb2Se3 being a potential material for solar cells, photodetectors and thermoelectric applications, this combination of fast and facile solvent-mediated microwave synthesis and screen-printing approach exhibits importance towards the wearable technology application for harvesting alternate electrical energy. INTRODUCTION V-VI group binary compounds are typical narrow band semiconductors and their nanostructures are of prime interest because of their dimensional-dependent properties [1]. Among these materials, antimony selenide (Sb2Se3) has gained great attention because of its potential technical applications in many areas including photoelectric, photoluminescence, thermoelectric and photon conducting devices. [1] Research on nanotechnology concerns the fabrication of nanomaterials and their applications in a variety of areas. From last few decades it has emerged as a fast-growing field as the properties of nanomaterials are quite different than to those of bulk materials. In particular, one dimensional nanostructure such as nanowires, nanorods and nanotubes have attracted considerable attention due to their potential use in optical, electronic, magnetic and mechanical devices [2]. Among these compounds, the direct band-gap semiconductor Sb2Se3 (Eg ≈ 1.11 to 1.8 eV), with an orthorhombic crystal structure and Pbnm space group, has been extensively studied as an important thermoelectric material and photoconductive semiconductor and because of its high thermoelectric power (~1800μV/K) and unique solar characteristics [3.] It can be used in thermoelectric applications, as absorber in solar cells memory switching devices, [4,5]. In the past decade, various chemical methods have been developed for the synthesis of Sb2Se3 and other chalcogenide nanomaterials, such as vapor-phase processing, the template-directed method, the solgel route, the microwa
本文研究了采用优化丝网印刷法制备的Sb2Se3薄膜的结构、形态和光电性能。采用微波辅助溶剂热法合成Sb2Se3纳米线,以乙二醇为油墨制备Sb2Se3丝网印刷薄膜。结构分析证实为正交相,能量色散谱分析证实为Sb2Se3组成。纳米晶粉末(膜)的晶粒尺寸为60nm (104nm)。通过场发射扫描电镜(FESEM)对薄膜表面形貌进行了研究,结果表明:薄膜表面覆盖着长度为1 ~ 3μm、直径为100 ~ 200nm的纳米线,这些纳米线均匀分布在衬底上,并均匀聚集成直径为~0.8μm的球形颗粒。有趣的是,薄膜和纳米晶粉末的光电性能分别显示出1.19eV和1.22eV的带隙值,带隙的微小变化约为0.03eV,这与形貌特性相一致。Sb2Se3是太阳能电池、光电探测器和热电应用的潜在材料,这种快速简便的溶剂介导的微波合成和丝网印刷方法的结合对可穿戴技术的应用具有重要意义,可用于收集替代电能。V-VI基团二元化合物是典型的窄带半导体,其纳米结构因其尺寸依赖性而备受关注。在这些材料中,硒化锑(Sb2Se3)由于其在光电、光致发光、热电和光子传导器件等许多领域的潜在技术应用而备受关注。[1]纳米技术的研究涉及纳米材料的制造及其在各个领域的应用。在过去的几十年里,由于纳米材料的性质与块状材料有很大的不同,它已经成为一个快速发展的领域。特别是一维纳米结构,如纳米线、纳米棒和纳米管,由于其在光学、电子、磁性和机械器件中的潜在应用而引起了人们的广泛关注。其中,直接带隙半导体Sb2Se3 (Eg≈1.11 ~ 1.8 eV)具有正交晶体结构和Pbnm空间基团,由于其高热电功率(~1800μV/K)和独特的太阳能特性,作为一种重要的热电材料和光导半导体得到了广泛的研究[3]。它可以用于热电应用,作为太阳能电池存储开关器件的吸收剂,[4,5]。在过去的十年中,各种化学方法被开发用于合成Sb2Se3和其他硫系纳米材料,如气相法、模板法、溶胶法、微波辅助化学浴法和水热/溶剂热合成。这些方法各有优缺点[3]。因此,开发一种快速、绿色、高产率的合成均匀sb2se3纳米线的方法仍然是非常需要的。本文通过一种可靠、简便的方法成功合成了Sb2Se3纳米结构。然而,据我们所知,以往的研究大多涉及高毒性还原剂,方案耗时长,产量低的特点。此外,Sb2Se3薄膜可以通过化学浴沉积(CBD)、气相传输沉积(VTD)、共蒸发等不同的沉积技术进行沉积。所有这些技术都是高成本的,并且涉及到一个漫长的制备过程,因此需要一种低成本和更短时间的技术。丝网印刷是一种成本低、效果快的印刷技术。采用丝网印刷、喷墨印刷、直接书写或其他逐层方法湿沉积纳米晶胶体油墨具有许多优点,因为它们能够直接将纳米晶油墨转化为微/宏观功能材料和器件,具有极大的可扩展性、灵活性和成本效益。如今,丝网印刷也被探索为一种更有效的制造热电器件的方法。采用丝网印刷法制备了该薄膜,并对其光电性能和结构性能进行了研究。本文还研究并报道了Sb2Se3纳米晶粉末和丝网印刷Sb2Se3薄膜的表面形貌。采用快速、简便的微波辅助溶剂热法合成了Sb2Se3纳米结构。Sb2Se3以纳米晶粉末形式合成如下:取SbCl (80mg),加入SeO2(60mg),再加入油胺(12ml),置于锥形烧瓶中磁力搅拌5小时。 然后,将溶液在“CEM”制造的“Discover”研究型微波炉中微波加热10分钟。溶液的颜色变成了黑色。加热后,将溶液冷却,用水和乙醇清洗数次。最后以干粉形式收集Sb2Se3沉淀。油墨的制备:将Sb2Se3纳米晶粉末溶液与SbCl3混合,SbCl3作为粘合剂与乙二醇(溶剂)混合,制备浆料。丝网印刷工艺:采用自制丝网印刷装置沉积薄膜,如图1所示。玻璃被用作薄膜制备的衬底。薄膜制备完成后,在1250C的常压下退火4小时,然后冷却干燥,使其正确粘附在玻璃基板上。薄膜干燥后,进行进一步的测量。图1所示。丝网印刷薄膜的整体制作过程示意图。利用Bruker D8 Advance x射线衍射仪进行XRD测量,确定合成样品的晶体结构。对Sb2Se3纳米晶粉末和膜的XRD谱图进行分析,如图1所示。纳米晶粉末XRD谱与JCPDS文件00015-0861匹配。从光谱上观察到Sb2Se3的晶体结构与Pbnm空间基团呈正交结构,其晶格参数为a =11.780Å b =11.633 Å c =3.985 Å。图2。(a)纳米晶线粉和(b)丝网印刷薄膜的Sb2Se3 XRD谱图。采用Debye - Scherrer公式计算Sb2Se3纳米晶粉的晶体尺寸:-
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引用次数: 1
Lattice mechanical properties of Rh0.6Ag0.4 and Rh0.8Ag0.2: A pseudopotential approach Rh0.6Ag0.4和Rh0.8Ag0.2的晶格力学性能:赝势方法
Pub Date : 2021-01-01 DOI: 10.1063/5.0061023
Nupur P. Vora, Priyank V. Kumar, S. Vyas, N. K. Bhatt, P. R. Vyas, V. Gohel
Transition metal alloys are valuable in material science research. In the present communication, Transition Metal Pseudopotential has been used to investigate lattice dynamics in symmetry and non-symmetry directions for binary alloy h ( = 0.6, 0.8). In absence of any neutron scattering data and theoretical results, we present theoretical results which may be considered as a prediction. Further, we have studied temperature variation of Debye temperature ( ) and dynamical elastic constants ( , and ). As experimental results are not available for elastic constants, we have compared our results with the values obtained by first principles method. Presently obtained results are comparable with such theoretical results.
过渡金属合金在材料科学研究中具有重要的应用价值。本文利用过渡金属赝势研究了二元合金h(= 0.6, 0.8)对称和非对称方向上的晶格动力学。在没有任何中子散射数据和理论结果的情况下,我们提出的理论结果可以被认为是一个预测。进一步,我们研究了德拜温度()和动力弹性常数()的温度变化。由于没有弹性常数的实验结果,我们将结果与第一性原理法得到的结果进行了比较。目前得到的结果与理论结果相当。
{"title":"Lattice mechanical properties of Rh0.6Ag0.4 and Rh0.8Ag0.2: A pseudopotential approach","authors":"Nupur P. Vora, Priyank V. Kumar, S. Vyas, N. K. Bhatt, P. R. Vyas, V. Gohel","doi":"10.1063/5.0061023","DOIUrl":"https://doi.org/10.1063/5.0061023","url":null,"abstract":"Transition metal alloys are valuable in material science research. In the present communication, Transition Metal Pseudopotential has been used to investigate lattice dynamics in symmetry and non-symmetry directions for binary alloy h ( = 0.6, 0.8). In absence of any neutron scattering data and theoretical results, we present theoretical results which may be considered as a prediction. Further, we have studied temperature variation of Debye temperature ( ) and dynamical elastic constants ( , and ). As experimental results are not available for elastic constants, we have compared our results with the values obtained by first principles method. Presently obtained results are comparable with such theoretical results.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87304995","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
Study of phonon dispersion and dynamical elastic constants for bcc binary molybdenum-niobium alloys bcc二元钼铌合金声子色散和动态弹性常数的研究
Pub Date : 2021-01-01 DOI: 10.1063/5.0061022
A. V. Nag, P. Kumar, D. S. Tripathi, N. K. Bhatt, P. R. Vyas, V. Gohel
In the present manuscript, we have confirmed the credibility of our proposed pseudopotential extracted from the generalized pseudopotential theory, by carrying out lattice dynamical and lattice mechanical studies for bcc binary molybdenum and niobium alloys. Here, we have calculated phonon dispersion curves, phonon density of states and temperature variation of Debye temperature ( ) for Mo0.41 Nb0.59 alloy. In addition to that, we have obtained the values of dynamical elastic constants (C11, C12 and C44) for Mo0.339 Nb0.661 alloy. The acquired results are quite reassuring in comparison to the experimental data and other theoretical calculations.
在本文中,我们通过对bcc二元钼铌合金的晶格动力学和晶格力学研究,证实了从广义伪势理论中提取的伪势的可信性。本文计算了Mo0.41 Nb0.59合金的声子色散曲线、声子态密度和德拜温度()的温度变化。此外,我们还得到了Mo0.339 Nb0.661合金的动态弹性常数(C11, C12和C44)的值。所得结果与实验数据和其他理论计算结果相比较,是令人放心的。
{"title":"Study of phonon dispersion and dynamical elastic constants for bcc binary molybdenum-niobium alloys","authors":"A. V. Nag, P. Kumar, D. S. Tripathi, N. K. Bhatt, P. R. Vyas, V. Gohel","doi":"10.1063/5.0061022","DOIUrl":"https://doi.org/10.1063/5.0061022","url":null,"abstract":"In the present manuscript, we have confirmed the credibility of our proposed pseudopotential extracted from the generalized pseudopotential theory, by carrying out lattice dynamical and lattice mechanical studies for bcc binary molybdenum and niobium alloys. Here, we have calculated phonon dispersion curves, phonon density of states and temperature variation of Debye temperature ( ) for Mo0.41 Nb0.59 alloy. In addition to that, we have obtained the values of dynamical elastic constants (C11, C12 and C44) for Mo0.339 Nb0.661 alloy. The acquired results are quite reassuring in comparison to the experimental data and other theoretical calculations.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78652794","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
Investigation on photocatalytic properties of RE-Doped titanium dioxide nanoparticles through sol - gel technique 溶胶-凝胶技术研究稀土掺杂二氧化钛纳米颗粒的光催化性能
Pub Date : 2021-01-01 DOI: 10.1063/5.0060851
P. R. Babu, B. Srimathy, K. Shakila, M. LakshmiPriya, R. Arivuselvi
Rare earth Ions (Y,Gd,Sm) doped TiO2 catalysts were prepared by the sol-gel method. Synthesized material was characterized by X-ray diffraction (XRD), UV-Diffuse reflectance spectroscopy (DRS), FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning electron microscopy) and TEM (Transmission electron microscopy). The increase in photo activity is probably analyzed by the shift transfer in UV-DRS and it was confirmed by the degradation of Methylene Blue in water under UV-light irradiation was used to evaluate the photocatalytic activity of prepared catalysts. The result showed that the Tridoping of the rare earth ions can significantly enhance the photocatalytic activity of TiO2 doped rare earth compare with the pristine TiO2.
采用溶胶-凝胶法制备了稀土离子(Y,Gd,Sm)掺杂TiO2催化剂。采用x射线衍射(XRD)、紫外漫反射光谱(DRS)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)和透射电镜(TEM)对合成材料进行了表征。光活性的增加可能是通过UV-DRS中的移位转移来分析的,并且在紫外线照射下对水中亚甲基蓝的降解也证实了这一点。结果表明,稀土离子的三聚能显著提高掺杂TiO2的光催化活性。
{"title":"Investigation on photocatalytic properties of RE-Doped titanium dioxide nanoparticles through sol - gel technique","authors":"P. R. Babu, B. Srimathy, K. Shakila, M. LakshmiPriya, R. Arivuselvi","doi":"10.1063/5.0060851","DOIUrl":"https://doi.org/10.1063/5.0060851","url":null,"abstract":"Rare earth Ions (Y,Gd,Sm) doped TiO2 catalysts were prepared by the sol-gel method. Synthesized material was characterized by X-ray diffraction (XRD), UV-Diffuse reflectance spectroscopy (DRS), FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning electron microscopy) and TEM (Transmission electron microscopy). The increase in photo activity is probably analyzed by the shift transfer in UV-DRS and it was confirmed by the degradation of Methylene Blue in water under UV-light irradiation was used to evaluate the photocatalytic activity of prepared catalysts. The result showed that the Tridoping of the rare earth ions can significantly enhance the photocatalytic activity of TiO2 doped rare earth compare with the pristine TiO2.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"494 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85617416","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
Sol-gel auto-combustion synthesis, cation distribution and physicochemical properties of Ni0.6Cd0.4Fe2O4 NPs Ni0.6Cd0.4Fe2O4 NPs的溶胶-凝胶自燃合成、阳离子分布及理化性质
Pub Date : 2021-01-01 DOI: 10.1063/5.0061166
B. H. Devmunde, D. P. Nandagawali, M. B. Solunke, D. R. Shengule
The intent of begun work is to synthesis and study the structural, electric, magnetic and frequency dependent dielectric properties of Ni0.6Cd0.4Fe2O4 NPs fabricated via sol-gel auto-combustion technic. The XRD data affirmed that the synthesized Ni0.6Cd0.4Fe2O4 NPs do possess a single phase; spinel structure; cubic geometry and ferrite in nature. The lattice constant (a) was estimated to be 8.363 Å and the crystallite size (t) determined from Debay-Scherrer method was found to be 48.70 nm. SEM images of Ni0.6Cd0.4Fe2O4 NPs may propose the spherically shaped with the formation of fusion in gains. Activation energy (∆E) determined from the Arrhenius relation was recorded as 0.03 eV. Eventually, comprehensive magnetic parameters viz. (Ms), (Hc), (nB) were shown to be decreased in comparison to the unloaded NiFe2O4 ferrite as an effect on non-magnetic Cd2+ ions over magnetic Ni2+ and Fe3+ ions.
本文的目的是合成和研究溶胶-凝胶自燃烧法制备的Ni0.6Cd0.4Fe2O4纳米粒子的结构、电、磁和频率相关的介电性能。XRD数据证实合成的Ni0.6Cd0.4Fe2O4 NPs确实具有单相;尖晶石结构;立方几何和自然界中的铁氧体。晶格常数(a)估计为8.363 Å,由Debay-Scherrer法测定的晶粒尺寸(t)为48.70 nm。Ni0.6Cd0.4Fe2O4 NPs的SEM图像显示,随着增益的形成,NPs呈球形。由Arrhenius关系测定的活化能∆E记录为0.03 eV。最后,综合磁性参数(Ms), (Hc), (nB)与未加载的NiFe2O4铁氧体相比,显示出对非磁性Cd2+离子的影响比磁性Ni2+和Fe3+离子的影响要小。
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引用次数: 2
Enhanced photoelectrochemical performance of CeO2 functionalized TiO2 nanotube arrays with Ag coating Ag涂层增强CeO2功能化TiO2纳米管阵列的光电化学性能
Pub Date : 2021-01-01 DOI: 10.1063/5.0060970
S. Dey, Nasima Khatun, Somnath C. Roy
The photoelectrochemical performance of Ag coated CeO2 functionalized TiO2 nanotube arrays (AgCeTNT) is investigated here. The sample is prepared via three steps, such as synthesis of TiO2 nanotube by electrochemical anodization, CeO2 functionalization by hydrothermal and Ag coating by Successive Ionic Layer Adsorption and Reaction (SILAR) method. X-ray diffraction (XRD) analysis showed the anatase phase formation after annealing of TiO2 nanotubes. Field Emission Scanning Electron Microscopic (FESEM) images showed the conformal coverage of CeO2 and Ag nanoparticles on the surface of TiO2 nanotubes. Energy Dispersive X-Ray (EDX) analysis confirmed the presence of Ce, Ag, Ti and O in the AgCeTNT sample. Diffuse Reflectance Spectroscopy (DRS) study revealed the enhancement in visible light sensitivity with CeO2 functionalization and further with Ag coating. The photoelectrochemical measurement showed that the AgCeTNT sample exhibits improved photoelectrochemical performance compared to bare TiO2 nanotubes (TNT), CeO2 functionalized TiO2 nanotubes (CeTNT) and Ag coated TiO2 nanotubes (AgTNT) under the illumination of sunlight. This improvement in photoelectrochemical performance happeneddue to the combined effect of favorable band alignment of CeO2 and TiO2 and Surface Plasmon Resonance (SPR) effect of Ag nanoparticles, which lead to superior charge separation, efficient charge transport and enhanced visible light response.
研究了Ag包覆CeO2功能化TiO2纳米管阵列(AgCeTNT)的光电化学性能。采用电化学阳极氧化法制备TiO2纳米管,水热法对CeO2进行功能化,采用连续离子层吸附反应(SILAR)法制备Ag。x射线衍射(XRD)分析表明,TiO2纳米管退火后形成锐钛矿相。场发射扫描电镜(FESEM)图像显示TiO2纳米管表面有CeO2和Ag纳米颗粒的保形覆盖。能量色散x射线(EDX)分析证实了AgCeTNT样品中存在Ce、Ag、Ti和O。漫反射光谱(DRS)研究表明,CeO2官能化和Ag涂层进一步增强了可见光灵敏度。光电化学测量结果表明,在阳光照射下,AgCeTNT样品比裸TiO2纳米管(TNT)、CeO2功能化TiO2纳米管(CeTNT)和Ag包覆TiO2纳米管(AgTNT)具有更好的光电化学性能。这种电化学性能的提高是由于CeO2和TiO2良好的能带对准和Ag纳米粒子的表面等离子体共振(SPR)效应的共同作用,从而导致了优越的电荷分离,高效的电荷传输和增强的可见光响应。
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引用次数: 3
Decay study of monument sand stones 纪念性砂石的衰变研究
Pub Date : 2021-01-01 DOI: 10.1063/5.0061210
ra Kuri, S. Dadami, Manjula V. Katageri
Selected ancient sandstone monuments (56 th centuries) from Aihole, Pattadakal from Bagalkot district, local quarries stone and sandstone sample of Akkaragall quarries of India were characterized for their mineralogical and physical properties. X-ray diffraction (XRD) coupled with scanning electron microscopy (SEM) are used to discuss the ancient ceramic technology and composition. From XRD analysis we observed that Durga temple and Iranna padi quarry sand stone sample contains Quartz & chromium whereas Akkaragall quarry sand stone sample contains Quartz and silica. Particular attention were given to the analysis of composition of monuments stone with quarries stone and its decay.
从巴加尔科特地区的Aihole, Pattadakal,当地采石场的石头和印度Akkaragall采石场的砂岩样本中选择了56世纪的古代砂岩纪念碑,对其矿物学和物理性质进行了表征。利用x射线衍射(XRD)和扫描电子显微镜(SEM)分析了古代陶瓷的工艺和成分。通过XRD分析,我们发现Durga寺和Iranna padi采石场的砂岩样品含有石英和铬,而Akkaragall采石场的砂岩样品含有石英和二氧化硅。特别注意的是对纪念碑石与采石场石的组成及其衰变的分析。
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引用次数: 0
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NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020
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