The present work reports the structural, morphological, and optical analysis of rare earth metal ion (Nd3+) doped Titanium Dioxide Nanoparticles. Titanium Dioxide doped with Neodymium ions (1wt% and 4wt%) have been studied by X-ray diffraction (XRD) Aanlysis, High Resolution Transmission Electron Microscopy (HR-TEM) analysis, Energy Dispersive X-ray Analysis (EDAX), Ultravioletvisible (UVVis) spectroscopic analysis. The powder X-ray diffraction patterns ensured the nanocrystalline anatase formation of all the samples. The morphology and particle size of the TiO2 host matrix were confirmed by High Resolution Transmission emission electron microscopy (HR-TEM). The particle size trend obtained from HR- TEM images is acceptable with the crystal size obtained from XRD results. Ultravioletvisible measurements were carried out to investigate the optical properties of our powdered titania. The dye sensitized solar cells were fabricated with these as-synthesized materials as the photoanode and the J-V measurement shows improved high open circuit voltage, short circuit current and high efficiency achieved. (c) 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the National Conference on Material Science.

In the present study, Pure and (1 wt% and 4 wt%) Gadolinium (Gd3+) doped TiO2 nanoparticles were developed with a hydrothermal method, and dye sensitized solar cells were fabricated using them as an electron transfer material. The anatase phase and structural property of pure and Gd3+ doped TiO2 nanoparticles were examined using XRD analysis. Energy Dispersive X-ray analysis (EDAX) confirmed the presence of titania nanoparticles and UV-Vis absorption spectroscopy was used for the investigation of the optical properties of synthesized photocatalysts. The photovoltaic performance of Gd3+:TiO2 based solar cells is improved compared to un-doped TiO2 based solar cell. The power conversion efficiency of the solar cells on Gd3+:TiO2 increased to 4.88%, which is higher than that of the solar cells based on un-doped TiO2. (c) 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the National Conference on Material Science.

Manganese vanadate nano pebbles were prepared by a simple co-precipitation method and calcined at 350 degrees C for 3 h. X-ray diffraction pattern and Fourier transform infrared spectroscopic analysis confirmed the monoclinic structure of Mn2V2O7 with metallic bond vibrations. Morphological features of manganese vanadate nanoparticles were observed as pebble-like morphology via Scanning electron microscope and High-resolution transmission electron microscopic analysis. Oxidation states and optical property of the synthesized manganese vanadate nano pebbles was examined through UV-Visible absorption spectroscopic analysis. Pseudocapacitance nature of prepared manganese vanadate nano pebbles was investigated by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopic techniques in 4 M aqueous KOH electrolyte. The maximum specific capacitance values of 528 Fg(-1) was attained in 4 M KOH electrolyte solution at 10 mVs(-1). Superior capacitive retention of about 90.1% was achieved along with 99% coulombic efficiency after 3000 continuous cycles. (C) 2020 Elsevier B.V. All rights reserved.

High-performance energy storage electrode materials are emerging demand in near future for the construction of supercapacitor with high energy and power densities. Herein, Nickel (II) Diethyldithiocarbamate was used as single-source precursor for Nickel Sulfide (Ni9S8) two-dimensional (2D) nanosheets (NSs) preparation and hexadecylamine as shape directing agent via simple solvothermal method. The orthorhombic structure of Ni9S8 NSs was confirmed by X-ray diffraction (XRD) pattern. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed that as-prepared Ni9S8 nanoparticles possess sheet-like morphology. Besides, the thermal stability of Ni(DTC)2 complex was studied by Thermogravimetric/Derivative Thermogravimetric (TG/DTG) with differential scanning calorimetric (DSC) analysis. The electrochemical properties of Ni9S8 NSs was studied using galvanostatic charge–discharge (GCD) and cyclic voltammetry (CV) techniques. From the charge–discharge study of Ni9S8 NSs, a high specific capacitance of 281 Fg−1 was obtained at a current density of 1 Ag−1 and up to 82% retentivity was achieved after 5000 cycles. Thus, the prepared Ni9S8 NSs could be the one of the attractive potential active electrode materials for the application of supercapacitor.

Abstract High-performance energy storage electrode materials are emerging demand in near future for the construction of supercapacitor with high energy and power densities. Herein, Nickel (II) Diethyldithiocarbamate was used as single source precursor for Nickel Sulfide (Ni9S8) two dimensional (2D) nanosheets preparation and hexadecylamine as shape directing agent via simple solvothermal method. The orthorhombic structure of Ni9S8 nanosheets was confirmed by X-ray diffraction (XRD) pattern. Scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) images revealed that as-prepared Ni9S8 nanoparticles possess sheet-like morphology. Besides, the thermal stability of Ni(DTC)2 complex was studied by Thermo-gravimetric/Derivative thermo gravimetric(TG/DTG) with Differential scanning calorimetric (DSC) analysis. The electrochemical properties of Ni9S8 nanosheets was studied using galvanostatic charge-discharge (GCD) and cyclic voltammetry (CV) techniques. From the charge-discharge study of Ni9S8 nanosheets, a high specific capacitance of 281 Fg− 1 was obtained at a current density of 1 Ag− 1, and up to 82 % retentivity was achieved after 5000 cycles. Thus, the prepared Ni9S8 nanosheets could be one of the attractive potential active electrode materials for the application of supercapacitor.

The supercapacitive behaviour of chemically synthesized cobalt vanadate nanostructures was reported in this work. Various analytical techniques along with optical studies were utilized to investigate the crystallographic information's and optical response. Crystallographic information of the prepared nanostructures was revealed by the XRD analysis and it's formation was confirmed by the FTIR and XPS techniques. The nano-layered structural and surface morphology was observed through scanning electron microscopy and high-resolution transmission electron microscopy. Electrochemical performances in aqueous electrolytic medium were examined for supercapacitive behaviour of prepared Co3V2O8. Specific capacitance value of about 790 F/g was achieved at 1 A/g current density and the superior capacitive retention of 90.1 % after 10000 cycles had been imparted by the prepared Co3V2O8. Based on the results, it was confirmed that the prepared cobalt vanadate nanostructures can be used as an electrode material for future energy storage devices.

The nanostructured cobalt hydroxide [Co(OH)(2)] embedded carbon nanotubes (CNT) have been synthesised by a simple chemical reflux method. The crystallinity of cobalt hydroxide has been confirmed by using powder X-ray diffraction data. The presence of CNT in the synthesised nanocomposite is also examined. Fourier transform infrared spectroscopy reveals the OH and Co-O vibrations in the Co(OH)(2)/fCNT nanocomposite. SEM and TEM images expose the surface morphology of Co(OH)(2) sheet that is embedded over carbon nanotube. The electrochemical performance of the Co(OH)(2) embedded fCNT has been examined by the cyclic voltammetry in 6 M potassium hydroxide (KOH) electrolyte in room temperature. Co(OH)(2) embedded fCNT nanocomposite exhibits higher specific capacitance up to 1006.8 F/g at 0.5 mV s(-1) scan rate. The specific capacitance of Co(OH)(2) embedded fCNT nanocomposite is calculated from the charge-discharge curve. The synthesised hybrid nanocomposite is used as a cathode, and the functionalized CNT is used as an anode. These are used to fabricate an asymmetrical supercapacitor device. The device is delivered to a high power density of 7000 W kg(-1) and energy density of 17 W h kg(-1) in the potential window from 0 V to 1.4 V. The results of hybrid Co(OH)(2)/fCNT parallel to fCNT asymmetrical supercapacitor exhibit better cycle stability up to 5000 cycles. The usefulness of Co(OH)(2)/fCNT parallel to fCNT asymmetrical supercapacitor is analysed for energy storage devices.

Fe2O3 nanoparticles were prepared by simple chemical route. The structural, functional, morphological properties of prepared nanoparticles were obtained by Powder X-ray Diffraction analysis, Fourier transform infrared spectroscopy, and Scanning Electron Microscopy analysis respectively. The average grain size of the prepared nanoparticles was calculated using the Scherrer formula. The functional groups and metal bonding were analyzed through FTIR analysis. The external morphology of the prepared nanomaterials was analyzed with scanning electron microscopy technique. Electrochemical property of the prepared nanomaterial was examined with the help of cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy.

The aim of the present work is to investigate the influence of Samarium ions doping in the TiO2 host lattice and the contribution to the optical properties of this semiconductor. The X-ray diffraction pattern shows the formation of anatase phase TiO2 nanoparticles of average sizes 7.8 nm, 7.21 nm and 6.1 nm for both pure and 1 wt% and 4 wt% of Sm3+ doped samples respectivity. Energy Dispersive X-ray (EDX) spectroscopy confirms the presence of Sm ions within the Sm substituted TiO2 nanoparticles. These results suggest that, Pure and doped TiO2 samples confirm anatase phase of good crystallinity with smaller crystallite size. UV- visible spectra display stronger absorption in the visible region. The photocatalytic experiments are investigated by the removal of rhodamine B under UV light. Compared to the other two photocatalysts, the results shows that 4 wt% of Sm3+ doped TiO2 exposes the highest photocatalytic performance. (c) 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the National Conference on Material Science.

The optimized electronic and ionic conductivity to minimize the total resistance in electrodes are investigated for the nickel hydroxide-carbon nanotubes nanocomposites synthesised by the chemical reflux method. The powder X-ray diffraction results revealed that, Ni(OH)2 nanoparticles successfully encapsulated with carbon nanotubes and title composite was formed. The existence of important vibrations of CNT and Ni(OH)2 was confirmed by FTIR spectra. Surface microstructure patterns were recorded by scanning electron microscopy (SEM) in different parts of the sample with different magnification. The SEM analysis revealed that, Ni(OH)2 mixed well with carbon nanotubes. Energy dispersive X-ray analysis confirmed the existence of elements present in the synthesised composite and with good agreement between experimental and theoretically values. The electrode was prepared from the synthesised Ni(OH)2/CNT nanocomposite and specific capacitance measurement was made to it by using potentiostat. Charge-discharge ability of Ni(OH)2/CNT electrode was analysed and its results are presented. Electrochemical oxidation-reduction behaviour of Ni-CNT composite was investigated by cyclic voltametery. The electrochemical impedance spectra revealed that, internal resistance between electrode/electrolyte interface play significant role and results are presented.

Cucurbita seed like zinc oxide (ZnO) nanoparticle is synthesised via chemical reflux method. The phase, size and structure of ZnO elucidates by X-ray diffraction method. Infrared spectrum is revealed its functional groups which are present in the synthesised nanoparticles. The cucurbita seed like morphology of prepared zinc oxide nanoparticles were examined by SEM analysis. Optical absorption property and bandgap of synthesized ZnO nanoparticles are investigated. The electrochemical activity of Cucurbita seed like ZnO nanoparticles measurement carry out through electrochemical impedance analysis, galvanostatic charge discharge and cyclic voltammetry results

Pyrochlore structured nickel vanadate nanorods had been prepared by simple co-precipitation method. It was examined for pseudocapacitor electrode material. Morphological, optical and structural aspects of synthesized materials had been studied using a high-resolution transmission electron microscopy, UV–Visible absorption spectroscopy and powder X-ray diffraction analysis, respectively. The functional groups, stretching and bending vibrations were traced by Fourier transform infrared spectroscopy and the formation of nickel vanadate nanorods was confirmed by the binding energy analysis through X-ray photoelectron spectroscopic studies. The rod-shaped nanostructures of pyro nickel vanadate were confirmed by the scanning electron microscopy and HR-TEM analysis. Electrochemical techniques such as cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy techniques were used to analyse the supercapacitive behaviour of the prepared nanorods. Pyro nickel vanadate nanorods possesses excellent electrochemical stability up to 3000 cycles and the performance retention of about 94.1% was achieved even after 3000 repetitive charge-discharge cycles.

Gd doped CdTe (Gd:CdTe) QDs sensitized working electrodes were fabricated for QDSSC applications. In this fabrication process, mercapto succinic acid capped Gd:CdTe QDs were synthesized by colloidal method and used as the sensitizer. Improved optical properties of the prepared QDs were examined by optical absorption and emission spectral analysis. Fluorescence quantum yield measurement reveals that 10% Gd:CdTe QDs shows the highest quantum yield of 67%. XRD analysis confirms the cubic zinc blende crystalline structure of the prepared QDs and the dopant concentration dependent cell parameters and crystallite sizes were revealed. Performance of capping molecules over the prepared QDs was analyzed by FT-IR studies. Enhanced photovoltaic performance of prepared pure and doped QDs was analyzed through J-V characteristic curves, which show better photovoltaic response with an efficiency of 2.24% for 10% Gd:CdTe QDs.

The manganese oxide (Mn3O4) nanoparticles (NPs) were immobilized in the surface of functionalized carbon nanotubes (fCNT) (Mn3O4-fCNT composite) for the enhancement of electrochemical performances. The broad and notable crystalline peaks were found in a powder X-ray diffraction pattern of Mn3O4-fCNT and it confirms that, Mn3O4 presence in nanoscale. The functional vibrations of -OH, -COOH, C=O, C-O were found in FTIR spectrum and Raman spectra also recorded to understand functional groups present in the composite. The surface morphology was studied and also, the elemental analysis was carried out for Mn3O4-fCNT using SEM images of the composite. The electrochemistry responses of Mn3O4-fCNT were investigated. We have evaluated its response and performances in cyclic voltammetry, impedance, galvanostatic charge-discharge aspects. A notable specific capacitance of 499 Fg(-1) at 0.1 mAg(-1) was found in Mn3O4-fCNT. The asymmetrical supercapacitor was designed with Mn3O4-fCNT and ZnO-CNT and its specific capacitance was evaluated.

Nano structured zinc vanadate, Zn-3(VO4)(2), have been successfully synthesized by simple co-precipitation method and calcined at 600 degrees C. Calcinated Zn-3(VO4)(2) nano flakes were characterized by various analytical techniques to examine the structural, optical, and surface morphological properties. The X-ray diffraction pattern revealed that the prepared Zn-3(VO4)(2) nanoparticles were orthorhombic crystalline structure and found the crystallite structure was similar to 44 nm. The flake shaped Zn-3(VO4)(2) nanoparticles was evaluated by electron microscopies such as scanning electron microscopy and high-resolution transmission electron microscopy studies. Elemental compositions and functional groups were elucidated by energy dispersive spectroscopy with mapping and Fourier transform infrared spectral studies. Electrochemical behaviour of Zn-3(VO4)(2) nanostructures were investigated by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopic analysis. The specific capacitance value for the prepared nanoparticles was 312 Fg(-1) with high retention of about 90.7% which was achieved after 5000th cycles. It clearly revealed that synthesized Zn-3(VO4)(2) nanoparticles may lead to potential application for forthcoming energy storage devices.

ZnO nanorods embedded on functionalized CNT have been synthesised by the chemical refluxing method. The characterization results revealed the tube-like structure of carbon nanotubes, that expose the ZnO nanorods grafted upright and parallel on the floor across the CNT surface. The powder X-ray diffraction patterns show that crystalline ZnO nanorods are highly loaded on the surface of CNT and formed as a nano-composite. Raman spectroscopy results showed that the intensity of D and G bands decreased due to the loading of ZnO nanorods. Cyclic voltammetry curves reveal the double layer capacitor (EDLC) behaviour of ZnO/CNT. The synthesised hybrid ZnO/CNT exhibits a high specific capacitance (SPc) of 189 Fg-1. The quick charge-discharge performance was found about 95 Fg-1 and the cyclic stability of 96% was observed for 1000 cycles. ZnO/CNT nano-composites also exhibit a high power density of 2250 W kg-1.

Carbon spheres wrapped by maghemite nanoparticles were synthesized through facile hydrothermal method. The structural parameters were analyzed through powder x-ray diffraction analysis. Functional groups were analyzed by Fourier transform infrared spectroscopic analysis. The prepared carbon spheres wrapped by maghemite nanoparticles morphology were investigated using scanning electron microscopic analysis. The elemental composition and distribution of elements were examined by energy dispersive spectroscopic technique with mapping. Redox property, charge discharge mechanism was done through cyclic voltammetry and galvanostatic charge-discharge studies.

Pure MnO2 nanorods were synthesized by hydrothermal method and characterized by different techniques to analyze their crystalline nature, surface morphology, functional groups, and optical properties. XRD analysis confirms that the prepared nanorods possess a tetragonal crystalline structure. The occurrence of nanorods was confirmed by SEM analysis and its elemental composition was studied by elemental mapping. MnO2 nanorods modified working electrode was fabricated by the deposition of prepared nanorods on nickel foil. Electrochemical performance of the MnO2 nanorods modified working electrode was studied using redox additive based electrolyte containing 0.1M K4 [Fe(CN)6 ] in 1M KOH solution. The maximum specific capacitance of the prepared nanorods in 1M KOH electrolyte was 89 Fg-1 and it is greatly enhanced by the addition of 0.1M K4 [Fe(CN)6 ] redox additives (634 Fg-1 ).

Iron vanadate nanoparticles were prepared by simple co-precipitation method. The crystal structure and elemental composition of prepared material were confirmed using X-ray Diffraction analysis and Elemental Dispersive X- ray spectroscopic analysis respectively. Surface morphology of the sample was analyzed by Scanning Electron Microscopic techniques. Optical absorption and molecular vibrations were studied by UV-Vis. absorption spectroscopy and Fourier Transform Infrared spectroscopic techniques. Electrochemical behaviors such as redox property, charge-discharge mechanism and impedance analysis were examined with cyclic voltammetry, Galvanostatic charge-discharge and electrochemical impedance spectroscopic studies.

Drying mediated self-aggregation patterns of CdTe colloidal QDs through simple evaporation method was reported. Thioglycolic acid (TGA) capped CdTe QDs were prepared in aqueous phase through colloidal route and their structural, optical and morphological behaviors were studied. The drying patterns of CdTe QDs were fabricated under a constant evaporation rate. The coffee ring effect and the drying pattern formations were studied for the TGA capped CdTe colloidal QDs suspension in an aqueous medium. The structural behavior of the CdTe QDs and the drying patterns were revealed by the X-ray diffraction analysis. The size-tunable optical properties of the prepared CdTe QDs were studied by the optical absorption and emission spectroscopy. The capping effects of TGA on CdTe QDs were confirmed by the FT-IR analysis. The surface morphology of the TGA capped CdTe QDs and the drying mediated aggregation patterns of CdTe colloidal suspension were studied by the scanning electron microscopy analysis. The drying mediated patterns from the evaporation technique were suggested as a simple technique for the fabrication of molecular devices.