Cubic Phase Structure Research Articles

The encapsulation of noble metal over metal oxide semiconductor TiO2@Ag for the degradation of sulphur dye in effluent water by photocatalysis and electrochemical water splitting

Metal Oxide Semiconductor - Metal core-shell nanostructure with TiO2 as core and Ag nanoparticles as shell (TiO2@Ag) have been synthesized by a simple, environmentally friendly room temperature wet chemical method. The prepared TiO2@Ag core-shell nanoparticle was characterized by using various analytic techniques. X-ray diffraction analysis confirms the formation of tetragonal bcc structure anatase phase of TiO2 and Face-Centred Cubic structure (fcc) of silver in core-shell nanostructure. Fourier Transform Infrared Spectroscopy (FTIR) study proved the presence of characteristic peaks of both TiO2 and Ag. XPS study revealed the existence Ti4+ and metallic silver in core-shell nanostructure, High - Resolution Transmission Electron Microscopy (HR–TEM) and High - Resolution Scanning Electron Microscopy (HR–SEM) revealed the covering of Ag nanoparticles at the surface of TiO2 spheres. The TiO2@Ag core-shell nanoparticles exhibit a high residual mass of 95.9 % and stability to withstand up to 1000 °C. The prepared TiO2@Ag core-shell nanoparticles as photocatalyst showed enhanced photocatalytic degradation (240 min) of sulphur dye in effluent water with a degradation efficiency of 81 % and capable of employing in wastewater treatment to eliminate toxic elements present in it. In the current study, we have used core-shell nanoparticles prepared using the wet chemical method at room temperature. The prepared core-shell nanoparticles were used to study the photocatalytic degradation of sulphur black dye directly collected from textile effluent water. They were also used for the production of oxygen and hydrogen through the electrolysis process. The synthesized TiO2@Ag core-shell nanoparticles act as effective electrocatalyst for the production of oxygen and hydrogen through oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) using the electrolysis process.

Enhanced photocatalytic activity in AgCu-decorated ZnO nanoparticles under UV and sunlight

This study investigates the structural, morphological, and photocatalytic properties of monometallic (Ag and Cu) and bimetallic (AgCu) nanoparticles (NPs) incorporated into ZnO NPs and their photocatalytic performance. X-ray diffraction and Rietveld refinement were employed to analyze the structural characteristics, revealing the formation of a hexagonal wurtzite structure of ZnO and cubic phases of Ag and Cu within the metal-decorated NPs. Scanning electron microscopy provided visual evidence of the spherical morphology, with an average particle size of 50 nm. Energy-dispersive X-ray spectroscopy confirmed the successful deposition of Ag, Cu, and AgCu NPs onto the ZnO surface. The photocatalytic efficiency of the NPs was evaluated by the degradation of methylene blue dye under UV light at a wavelength of 254 nm under sunlight irradiation. Under UV light, the bimetallic AgCu/ZnO system exhibited exceptional performance, achieving a degradation rate of about 95% with 10% AgCu/ZnO. Conversely, under sunlight illumination, the monometallic Cu/ZnO and Ag/ZnO NPs exhibited outstanding photocatalytic properties, with degradation rates of about 99 and 98%, respectively. These findings underscore the influence of the light source on photocatalytic performance as well as the significance of the plasmonic effects and charge-transfer mechanisms.

Modification induced by 120 MeV Ag ion irradiation in ZnS

We report the structural, morphological, and optical properties of ZnS thin films before and after swift heavy ion (SHI) irradiation of 120 MeV Ag ions. These films were deposited by the spin coating method on the glass substrate and irradiated at various ion fluencies from 1 × 1011 to 1 × 1013 ions/cm2. The Grazing Incidence X-ray diffraction (GIXRD), Scanning electron microscopy (SEM), UV–visible transmittance, Photoluminescence (PL), and Raman Spectroscopy were used to characterize these ZnS thin films. The GIXRD patterns show a mixed phase of cubic and hexagonal structure after the ion irradiation. The crystallite sizes of pure and irradiated films are significantly modified. Raman spectroscopy shows a slight increase in the intensity of the 3LO mode of ZnS on irradiation. The SEM image shows nanoflake-like structures in pristine, and the irradiated thin films depict various morphologies (rod, platy, and sphere-like). UV–visible shows a cut-off wavelength at 339 nm and the spectra are blue-shifted with the increase in ion fluence. The Tauc plots reveal the increase in the band gap. The intensity of PL decreases with ion irradiation. Hence the analytical results show that the structural and optical properties of ZnS thin films are altered on swift heavy ion irradiation which may have potential applications in optoelectronic applications.

Pressure-induced superconductivity and robust Tc against external pressure in (Ge,Sn,Pb)Te

The robustness of superconducting transition temperature (Tc) against external pressure in medium entropy alloy (MEA) and high entropy alloy (HEA) -type compounds has attracted significant interest with regards to the realization of stable superconducting applications. In this study, we have synthesized Ge1/3Sn1/3Pb1/3Te belonging to MEA-type MTe, where the M site comprises only isovalent group-14 elements, to depict a critical factor for the robustness of Tc. High-pressure electrical transport measurements and structural analysis reveal that the high-pressure phase of CsCl-type cubic structure exhibits the robustness of Tc against external pressure. Molecular dynamics simulation and density functional theory calculation suggest that the glassy atomic vibration characteristic mainly contributes to the appearance of the robustness. This insight accelerates the further development of unique properties within HEA superconductors and their applications.

Temperature dependence of the strength of Nb-Mo-Ta-W alloys due to screw dislocations

The Nb-Mo-Ta-W system has attracted significant attention as a model alloy of the refractory multi-principal element alloy family. Nb-Mo-Ta-W crystallizes as a single phase in the body-centered cubic (bcc) structure and possesses exceptional mechanical properties at high temperature. However, unlike in standard bcc metals, the ground-state configurations of screw dislocations in Nb-Mo-Ta-W are highly twisted, with dislocation lines displaying a high concentration of kinks and cross-kinks at all temperatures. This gives rise to a strengthening of chemical nature associated with overcoming this intrinsic line roughness. In this paper we quantify the contribution to the total strength of this ‘self-pinning’ effect using a kinetic Monte Carlo model of screw dislocation lines that is not subjected to some of the traditional limitations of atomistic simulations. We find that the self-pinning stress remains even at high temperatures due to the balance of two competing effects: strengthening due to higher concentrations of kinks on multiple glide planes, and softening associated with the thermal dissolution of cross-kinks.

(AlCrMoTiNi)1-XNX high entropy ceramic with high hardness and toughness prepared by co-filtered cathodic vacuum arc deposition

High entropy ceramic (HEC) coatings have become candidates for new protective coating due to their high strength. However, the hardness - toughness balance of the ceramic coatings is still a difficult problem to solve. The strong nitride forming elements Al, Ti, Cr, Mo, and the non-nitride forming element Ni were selected as the components of the (AlCrMoTiNi)1-XNX HEC coatings to regulate the hardness and toughness. When x = 0 and 0.29, the composite structure of amorphous and metallic Ni phase is observed in these coatings. When x = 0.37, 0.40, and 0.45, the phase structure changes to the composite structure of nanoscale face-centered cubic (FCC) phase, metallic Ni, and amorphous phase. When x = 0.45, the maximum hardness of the HEC coating is 31.25 GPa, and it also has high toughness with a KIC value of 3.25 MPa m1/2. The HEC coating with high hardness and toughness also presents excellent wear resistance and corrosion resistance. Therefore, the (AlCrMoTiNi)0.55N0.45 HEC coating has potential as a protective coating applied in various areas.

Highly Efficient Orange-Red Emission in Sm3+-Doped Yttrium Gallium Garnet Single Crystal

High-quality single crystals with empirical composition Y2.96Sm0.04Ga5O12 (YGG: Sm3+) were successfully prepared by the optical floating zone method for the first time and compared with related single crystals of Y2.96Sm0.04Al5O12 (YAG: Sm3+). With both crystals, XRD showed that Sm3+ entered the cubic-phase structure. Optical absorption spectra produced a series of peaks from Sm3+ in the 250 nm to 550 nm range, and photoluminescence excitation (PLE) spectra detected at 613 nm showed strong excitation peaks at 407 nm and 468 nm. A strong emission peak at 611 nm (orange-red light) was observed in the photoluminescence (PL) spectra under excitations at both 407 and 468 nm, respectively, but it was much brighter under excitation at 407 nm. Furthermore, with both emission spectra, the peaks from the YGG: Sm3+ crystal were significantly more intense than those from the YAG: Sm3+ crystal, and both experienced a blue shift. In addition, under excitation at 407 nm, the color purity of the emitted orange-red light of YGG: Sm3+ was higher than that of the YAG: Sm3+ crystal, and the fluorescence lifetime for the 4G5/2 → 6H7/2 transition of YGG: Sm3+ was longer than that of the YAG: Sm3+ crystal. The optical properties of the YGG: Sm3+ crystal are better than those of the YAG: Sm3+ crystal.

Effects of RF magnetron sputtering power on the structure and nanohardness of high-entropy alloys (TiVCrNbSiTaBY)N hard coatings

High-entropy alloys (TiVCrNbSiTaBY)N hard coatings were deposited on silicon wafers and stainless steel plates using radio-frequency (RF) magnetron sputtering. The effects of RF power on the elemental composition, morphology, structure and nanohardness of coatings are evaluated. The coatings exhibit smooth surface with low roughness less than 1 nm. Higher RF power introduces more silicon into coatings and densifies the columnar structure. The coatings present nanocomposite structure of face-centered cubic phase and amorphous Si3N4. With increasing RF power, the content of amorphous phase rises and crystal grains are refined. The changes in structure lead to a tendency for nanohardness and elastic modulus of coatings to first increase and then decrease. The coating grown at 800 W has the highest nanohardness and highest elastic modulus of ∼38.1 GPa and ∼451.2 GPa, respectively. The strengthening mechanism is explained by the nanocrystal-TiN/amorphous-Si3N4 model. The annealing treatment in air demonstrates that the coating exhibits excellent oxidation resistance at 800 °C.

Fabrication and investigation of zinc telluride thin films

Zinc Telluride ZnTe alloys and thin film have been fabricated and deposited on glass substrates by thermal evaporation method which may be a suitable window layer of zinc telluride with different annealing temperatures (373 and473) K for 60 minutes in vacuum. Deposited thin films with thickness 100 nm was characteristic by using X-ray diffraction XRD to know structures, Atomic Force Microscopy (AFM) to evaluate surface topology, morphology. It was found out that the vacuum annealing improves on thin ZnTe films structure and surface morphology. Structural analysis reveals that ZnTe films have zinc blende structure of cubic phase with (111) preferred reflection and grain size is enhanced from 8.6 to 16.7 nm with annealing. Optical properties where optical bandgap energy values slightly decreased (2.3-2.2) eV as the annealing temperatures.

Studies on structural and optical characterization of Na:ZnS nanocomposites

In this work, we report the structural, morphological and optical characterization of pure and sodium (Na) mixed ZnS nanocomposites. The Na:ZnS nanocomposites were synthesized by the co-precipitation method using the Na2SO4. The powder XRD pattern reveals a mixed phase of cubic and hexagonal structure. The crystalline size was found to be ∼6 nm based on the full width at half maximum (FWHM) by using the Debye Scherrer formula. Moreover, the diffraction peaks were shifted towards a higher angle compared to pure ZnS. This can be due to the difference in the ionic radii of Na+ and Zn2+ ions. The SEM images show the spherical shape of nanocomposites. The UV-visible absorption spectra of pure and Na:ZnS show an absorption cut-off wavelength of 278 nm (4.46 eV) compared to bulk band gap of ZnS (3.78 eV). The blue shift can be attributed to the quantum confinement effect. In addition to that, the optical absorption increases with increasing Na concentration. The functional groups are identified by FTIR analysis. The photoluminescence (PL) study reveals the near band edge emission at 468 nm (2.64 eV). The broad and high relative intensity of defect level emission is observed in the lower energy side of the PL spectra. The intensity of luminescence increases with increasing Na concentration due to the radiative recombination process. The Raman spectra show the formation of nanocomposite through change in phonon frequency, structural disorder and width for LO phonon mode. A change of 1.7 cm−1 phonon width suggests the formation of disorder.

Pd-Enriched-Core/Pt-Enriched-Shell High-Entropy Alloys Nanoparticles with a Face-Centred Cubic Structure for C1 and C2 Alcohol Oxidation.

Recently, high-entropy alloy nanoparticles (HEA NPs) have aroused great interest globally with their unique electrochemical, catalytic, and mechanical properties, as well as diverse activity and multielement tunability for multi-step reactions. Herein, a facile low-temperature synthesis method at atmospheric pressure is employed to synthesize Pd-enriched-HEA-core and Pt-enriched-HEA-shell NPs with a single phase of face-centred cubic structure for promoting the oxidation of C1 and C2 alcohols. Interestingly, the lattice of both Pd-enriched-HEA-core and Pt-enriched-HEA-shell enlarge during the formation process of HEA, with tensile strains included in the core and shell of HEA. Strikingly, the as-made PdAgSn/PtBi HEA NPs show excellent electrocatalytic activity and durability for methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). Especially, the specific (mass) activity of PdAgSn/PtBi HEA NPs for MOR is 4.7 mA/cm2 (2874 mA mg(Pd+Pt)-1), about 1.7 (5.9) and 1.5 (4.8) times higher than that of commercial Pd/C and Pt/C catalysts, respectively. Combined with high-entropy effect, Pt sites and Pd sites on the interface of the HEA act synergistically to facilitate the multi-step process towards EOR. This study offers a promising way to find a feasible route for scalable HEA manufacturing with promising applications.

Structural, optical, and magnetic properties of Co‐doped CeO2 thin films prepared by radio‐frequency magnetron sputtering

Co‐doped CeO2 (Ce1‐xCoxO2, x = 0, 0.03, and 0.06) thin films were prepared by radio‐frequency magnetron sputtering. The structural, optical, and magnetic properties of these films were characterized by X‐ray diffraction (XRD), Raman spectroscopy (Raman), atomic force microscopy (AFM), Fourier transform‐infrared spectroscopy (FT‐IR), spectroscopic ellipsometry (SE), and superconducting quantum interference magnetometer (SQUID). XRD and Raman studies revealed that all the films exhibited single phase of cubic fluorite structure, with highly (111) preferred orientation. No Co and Co‐related oxide was detected. Compared with undoped CeO2 films, the defect concentration of Co‐doped films increases. AFM images displayed that the film surface morphology is dependent on the Co‐doped content. The vibrational band assignment of undoped and Co‐doped CeO2 films was analyzed by FT‐IR. The energy dispersion optical constants (the refractive index n and the extinction coefficient k) of Ce1‐xCoxO2 thin films were obtained by analyzing the SE spectra in the ultraviolet and visible‐near infrared (UV–NIR) region (0.5–5.9 eV). The optical band gap energies Eg for these films were determined. The Eg values of the Ce1‐xCoxO2 thin films are 3.35, 3.27, and 3.25 eV, and the n values at wavelength of 632 nm are about 2.35, 2.38, and 2.42 for Co‐doped content x = 0, 0.03, and 0.06, respectively. SQUID measurements show that Co‐doped CeO2 films exhibit room temperature ferromagnetism, and the saturation magnetization (Ms) is 0.0051 and 0.0098 emμ/cm3 with the Co doping content x = 0.03 and 0.06, respectively. The ferromagnetism of Co‐doped CeO2 films belong to the intrinsic magnetism of the films.

Macro-micro numerical simulation and experimental study of Mg-Gd-Y-Zn-Zr alloy fabricated by cold metal transfer wire arc additive manufacturing

The Mg-Gd-Y-Zn-Zr alloy components were fabricated by cold metal transfer (CMT) based wire arc additive manufacturing (WAAM). The heat transfer and equiaxed grain growth in the weld pool bonding zone of the alloy were investigated through macro-micro numerical simulation. The results shows, the morphology of the molten pool in the bonding area is ellipsoid with a major semi-axis of 13 mm and a semi-minor axis of 6 mm. The size of the molten pool increases with increasing temperature. With the increase in the number of layers of material added, the high temperature zone is enlarged continuously. This is due to the weakening of the heat dissipation of the substrate and the preheating effect of the first material added on the subsequent material added. The phase field model of equiaxed grain growth during the solidification process of the CMT arc welding pool, was established. The growth of equiaxed crystals in the bonding region temperature gradients of 4.9 °C/m and 3.6 °C/m, the propulsion velocity of 1.5 m/min and 2.3 m/min were simulated, respectively. The further away the molten pool from the keyhole center, the smaller the temperature gradient, the faster the dendrite growth speed, and the more vigorous the dendrite morphology. The unique layered processing method and Marangoni effect of the melting pool in the bonding zone of CMT-WAAM arc additive promote the β-Mg24(Gd,Y)5 and RE-rich phases of body-centered cubic structure. These precipitated phases are evenly distributed at the grain boundaries, it hinders the migration of grain boundarie st, which in turn inhibits grain growth.

Effect of sputtering power on the properties of TiN coatings deposited by the magnetron sputtering

In this work, the TiN coatings on Ti6Al4V and Si substrates were deposited by magnetron sputtering. The effect of sputtering powers on structure and mechanical properties of the TiN coatings was investigated. X-ray diffraction patterns displayed a single phase of face centered cubic structure. Scanning electron microscope observations found that the particle morphology of the TiN coatings changed from a leaf or flat-shaped structure to a tetrahedron faceted one, similar to a pyramid. The particle size and deposition rate increased with increasing sputtering power due to higher energy bombardment of ion gas to surface target. Furthermore, the highest hardness value (22,8 GPa ± 1,2 GPa) corresponds to the TiN coating deposited at 250 W power. Finally, the friction coefficient increased from 0,46 to 0,61 with increasing sputtering power from 150 to 300 W.

ZnO/CeO2/carbon xerogel composites with direct Z-scheme heterojunctions: Enhancing photocatalytic remediation of 4-chlorophenol under visible light

This paper aims to create visible light driven ternary photocatalysts using zinc oxide (ZnO), cerium (IV) oxide (CeO2), and carbon xerogel (CX) as constituent materials. The use of CeO2 is based on the creation of direct-Z-scheme heterojunctions with the ZnO and the consequent diminishing of charge recombination, whereas the carbon xerogel inclusion is predicted to minimize bandgap energy, decrease electron-hole recombination, and boost specific surface area. Furthermore, the choice of the black-wattle tannin as a carbonaceous precursor was targeted at the development of an environmentally friendly and affordable composite. The existence of the hexagonal phase of zinc oxide and cubic structure of the cerium (IV) oxide in the ternary material was confirmed by X-ray diffractometry and X-ray photoelectron spectroscopy, with the latter also suggesting chemical bonding between the ZnO and the CX due to the creation of zinc oxycarbide complexes. The inclusion of the carbon xerogel provokes a significant modification in the morphology of the ternary material, resulting in an increased surface area and smaller particle aggregates. The CX/ZnO–CeO2 ternary composite obtains the highest photocatalytic efficiency among all the materials studied, degrading 100% of 4-chlorophenol under simulated sunlight and 68% under visible radiation, after 5 h. The increased photocatalytic activity can be attributed to the formation of direct Z-scheme heterojunctions between the semiconductors, higher visible light response, and higher specific surface area, as evidenced by the results obtained by active radical scavenging, chronoamperometry, diffuse reflectance spectroscopy, and N2 adsorption–desorption isotherms.

Tunable luminescence and oxygen defects of the spinel MgAl2O4: Eu3+/Eu2+ for photonic application

In this study, we have reported the luminescent property of 0, 0.05, 0.1, and 0.5 mol. % Eu2O3 doped in bulk MgAl2O4 spinel excited at 266 nm. The samples were prepared by slip-cast method and sintered at 1650 °C for 2 h in the air. The sintered samples were subjected to hot isostatic pressing (HIP) in argon atmosphere to achieve theoretical density and transparency. X-ray diffraction patterns for all samples revealed the spinel phase of the face-centered cubic structure. The luminescence of the sintered and HIPed samples was recorded using photoluminescence spectrometers. The sintered samples exhibited characteristic red light emission of Eu3+ at 613 nm. Surprisingly, this Eu3+ emission does not appear for the HIPed samples and shows a characteristic blue emission for the Eu2+ in the 445–480 nm range. Interestingly, further heat treatment of the HIPed samples at 1300 °C for 1 h in air revealed the re-appearance of the characteristic Eu3+ red emission at 613 nm without the Eu2+ blue emission. It is concluded that the Eu3+/Eu2+ emission centers are tunable depending on the processing conditions. Here a characteristic emission center at 482 nm was found for the sintered samples that indicate the presence of oxygen vacancy.

Comparative study on mechanical and tribological properties of Cr–Al–N and Cr–Al–O coatings deposited by cathodic arc evaporation

A comparative study was performed for (Cr1−xAlx)2O3 and (Cr1−xAlx)N coatings with different Al contents (x = 0, 0.5, and 0.7) concerning structural, mechanical, and tribological properties. The composition-dependent phase structure was found for Cr–Al–O coatings, where higher Al content promotes a mixed structure of cubic and minor amorphous phases. Moreover, the mixed-phase structure results in lower indentation hardness, ∼27 GPa, and residual compressive stress, ∼ −4 GPa, as compared to Cr2O3 and Cr–Al–N coatings. Besides, (Cr0.5Al0.5)2O3 and (Cr0.3Al0.7)2O3 show worse wear resistance with a wear rate higher than 1.0 × 10−5 mm3/N·m at 200 − 600 °C due to reduced hardness and lower residual stress. A higher bias potential of −150 V induces higher compressive residual stress and hardness, which is beneficial to the high-temperature wear resistance of Cr–Al–O coatings.

Impact of the B/C-doping ratio on the microstructure, mechanical properties, and cutting performance of AlTiN-based coatings

Certain element doping is a facile and powerful vehicle for tailoring the organization and properties of hard coatings. This research fabricated AlTiBCN coatings with various B/C doping ratios (the boron-carbon incorporation totaled 10 at.%) and explored the effect law of varying B/C ratios on the coatings' microstructure, mechanical properties, tribological, and cutting performances. All coatings exhibited a mixed structure of cubic and fibrous zincite phases, with the major phase being w- Al(Ti)N and the minor phases being c-Al(Ti)N and c-Ti(C, N). Besides, along with the increase in C-doping proportion, the coating organization shifted from a featureless glassy pattern to a fine-grained columnar crystal morphology. Boron was mainly found as -BN in the coatings, while carbon was mostly found as c-Ti(C, N) replacement solid solution (B/C ratio≤2.5:1, 0:10) and amorphous C (B/C ratio≤1:2.5, 0:10). According to the properties results, (1) AlTiBCN coating with a B/C ratio of 1:1 had the optimal mechanical, tribological, and cutting performance; (2) AlTiBCN coating with a B/C ratio≥ 2.5:1 and 10:0 had higher hardness but poorer coating brittleness and tribological properties due to excessive α-BN; (3) At B/C ratios≤ 1:2.5 and 0:10, the mechanical properties of its coatings dropped sharply, which means the coating's hardness, toughness, and wear resistance are aggravated by the strong softening effect of α-C.

Synthesis and Magnetic Properties of Carbon Doped and Reduced SrTiO3 Nanoparticles

We report on the studies of the synthesis, structural, and magnetic properties of undoped SrTiO3 (STO), carbon-doped STO:C, and reduced STO STO:R nanoparticles. Fine (~20–30 nm) and coarse (~100 nm) nanoparticles with a single phase of cubic perovskite-type structure were sintered by thermal decomposition of SrTiO(C2O4)2. Magnetization loops of fine STO:C and STO:R nanoparticles at low temperatures and an almost linear decrease in magnetization with temperature indicate the realization of a soft, ferromagnetic state in them, with a pronounced disorder effect characteristic of doped dilute magnetic semiconductors. Oxidation and particle size increase suppress the magnetic manifestations, demonstrating the importance of surface-related defects and oxygen deficiency in the emergence of magnetism. It was found that oxygen vacancies and doping with carbon make similar contributions to the magnetization, while complementary electron paramagnetic resonance, together with magnetization measurement studies, show that the most probable state of oxygen vacancies, which determine the appearance of magnetic properties, are charged F+ oxygen vacancies and C-impurity centers, which tend to segregate on the surface of nanoparticles.

Synthesis, Structural and Optical Properties of Co Doped Sm<sub>2</sub>O<sub>3</sub> Nanostructures

In the present investigation Co doped Sm2O3nanostructures (NS) with different concentrations (1%, 3% and 8%) synthesized by thermal decomposition and surface reduction methods using sodium hydroxide as precipitating agent. Flake-like shaped semiconductor crystal features, morphology, optical absorptivity, chemical composition determined by XRD (X-ray diffraction), SEM (scanning electron microscopy) and UV-Visible. Flake-like morphology of the NS observed in SEM analysis having grain size varies in between 80 and 96 nm. XRD pattern depicted mixed phase of cubic crystal structure with crystallite size lying between 36.8 and 29.9 nm. Red shift in the optical absorptivity was observed in the spectrum, and spectral shift from ultraviolet to visible region with optical band gap (Eg) value decreases from 4.33 to 2.01 eV. Upon excitation with ultraviolet radiation (excitation = 300 nm), NS showed red emission in all concentrations of Co dopant and maximal emission intensity appeared at 485.5 nm for 8% of Co dopant concentration. The NS finds prominent utility in the field of optoelectronics and photoelectronic applications.