UV-visible Reflectance Spectra Research Articles

Studies of Optical, Dielectric, Ferroelectric, and Structural Phase Transitions in 0.9[KNbO3]-0.1 [BaNi1/2Nb1/2O3−δ

The compound 0.9[KNbO3]-0.1[(BaNi1/2Nb1/2O3−δ] (KBNNO), a robust eco-friendly (lead-free) ferroelectric perovskite, has diverse applications in electronic and photonic devices. In this work, we report the dielectric, ferroelectric, and structural phase transitions behavior in the KBNNO compound using dielectric, X-ray diffraction, and Raman studies at ambient and as a function of temperature. Analyses of X-ray diffraction (XRD) data at room temperature (rtp) revealed the orthorhombic phase (sp. Gr. Amm2) of the compound with a minor secondary NiO cubic phase (sp. Gr. Fm3m). A direct optical band gap Eg of 1.66 eV was estimated at rtp from the UV–Vis reflectance spectrum analysis. Observation of non-saturated electric polarization loops were attributed to leakage current effects pertaining to oxygen vacancies in the compound. Magnetization studies showed ferromagnetism at room temperature (300 K) in this material. XRD studies on KBNNO at elevated temperatures revealed orthorhombic-to-tetragonal and tetragonal-to-cubic phase transitions at 523 and 713 K, respectively. Temperature-dependent dielectric response, being leaky, did not reveal any phase transition. Electrical conductivity data as a function of temperature obeyed Jonscher power law and satisfied the correlated barrier-hopping model, indicating dominance of the hopping conduction mechanism. Temperature-dependent Raman spectroscopic studies over a wide range of temperature (82–673 K) inferred the rhombohedral-to-orthorhombic and orthorhombic-to-tetragonal phase transitions at ~260, and 533 K, respectively. Several Raman bands were found to disappear, while a few Raman modes such as at 225, 270, 289, and 831 cm−1 exhibited discontinuity across the phase transitions at ~260 and 533 K.

Preparation, characterization and photocatalytic activity of SrTiO3 and Ag2O/SrTiO3 nanomaterials

The pure SrTiO3 nanoparticles were synthesized by sol-gel method and Ag2O loaded SrTiO3 (Ag2O/SrTiO3) was prepared by precipitation method. The obtained samples were characterized with powder X-ray diffraction (XRD), transmission electron microscope (TEM) and UV-visible diffuse reflection spectrum (DRS). The effect of Ag2O loading on the photocatalytic activity of Ag2O/SrTiO3 nanoparticles for the degradation of methyl orange (MO) as amodel pollutant under visible light irradiation was studied. Compared with pure SrTiO3 nanoparticles, the Ag2O/SrTiO3 nanoparticle displayed higher photocatalytic activity for the degradation of methyl orange and the 5 % Ag2O/SrTiO3 photocatalyst exhibited the highest photocatalytic activity.

Optical and Magnetic Properties of Cubic Double Perovskites Ba2RSbO6(R= Dy, Gd) Coordinated to Lattice Dynamical and Crystal‐Field Computations

Herein, optical (e.g., UV–Vis reflectance spectra, infrared and Raman spectroscopy) and magnetization properties of the double‐perovskite compounds Ba2DySbO6(BDS) and Ba2GdSbO6(BGS) are reported. Optical bandgap is determined to be 4.524 eV for BDS and 4.465 eV for BGS using Kubelka–Munk function fit to the UV–Vis spectra. The lattice dynamical calculations on the force‐field model are undertaken for assigning the observed infrared and Raman modes. The dc susceptibility does not exhibit magnetic ordering down to 2 K for the two compounds. The dc magnetization atT = 2 K does not saturate for BDS even at a magnetic field of 11 T, but saturates at 5 T to a value of 7μB/Gd3+for BGS. A frequency‐dependent cusp in the ac susceptibility appears at 3.3 K, that is unlikely generic spin‐glass‐like freezing, and may be attributed to the short‐range correlations among Dy3+‐moments in BDS. Crystal‐field (CF) computations are performed to analyze the magnetic data for BDS. The obtained CF level scheme of Dy3+ions demonstrates the observed susceptibility and isothermal magnetization curves very well. The field‐dependence of the two lowest CF levels along different principal axes does not exhibit any level crossing, consistent with the lack of ordering in Ba2DySbO6.

Surface optical phonon and multi – phonon transitions in YVO4:Eu3+ nanopowders

In this paper two methods of preparation of yttrium orthovanadate nanopowders were presented: Solid State Reaction (top – down approach) and Solution Combustion Synthesis (bottom – up approach). For starting structural characterization, X – Ray Powder Diffraction (XPRD) and Field Emission Scanning Electron Microscopy (FESEM) were used. We report the change in reflection spectra in europium doped YVO4 nanopowders with comparison to its bulk analog. In UV–Vis reflection spectra we consider the change in values of band gap in these structures, after resizing it from bulk to nanomaterial. In Far – Infrared (FIR) reflection spectra, we registered the existence of Surface Optical Phonon (SOP) and different multi – phonon processes which alter the reflection spectra of bulk YVO4. The influence of Eu ions is reflected through multi – phonon processes that occur and are connected with energy transfer from YVO4 lattice to Eu ions. All IR spectra were modeled using classical oscillator model with Drude part added which takes into account the free carrier contribution. Since our samples are distinctively inhomogeneous materials, we use Effective Medium theory in Maxwell Garnett approximation to model its effective dieletric function.

The Effect of Precursor Concentration on the Particle Size, Crystal Size, and Optical Energy Gap of CexSn1-xO2 Nanofabrication.

In the present work, a thermal treatment technique is applied for the synthesis of CexSn1−xO2 nanoparticles. Using this method has developed understanding of how lower and higher precursor values affect the morphology, structure, and optical properties of CexSn1−xO2 nanoparticles. CexSn1−xO2 nanoparticle synthesis involves a reaction between cerium and tin sources, namely, cerium nitrate hexahydrate and tin (II) chloride dihydrate, respectively, and the capping agent, polyvinylpyrrolidone (PVP). The findings indicate that lower x values yield smaller particle size with a higher energy band gap, while higher x values yield a larger particle size with a smaller energy band gap. Thus, products with lower x values may be suitable for antibacterial activity applications as smaller particles can diffuse through the cell wall faster, while products with higher x values may be suitable for solar cell energy applications as more electrons can be generated at larger particle sizes. The synthesized samples were profiled via a number of methods, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). As revealed by the XRD pattern analysis, the CexSn1−xO2 nanoparticles formed after calcination reflect the cubic fluorite structure and cassiterite-type tetragonal structure of CexSn1−xO2 nanoparticles. Meanwhile, using FT-IR analysis, Ce-O and Sn-O were confirmed as the primary bonds of ready CexSn1−xO2 nanoparticle samples, whilst TEM analysis highlighted that the average particle size was in the range 6−21 nm as the precursor concentration (Ce(NO3)3·6H2O) increased from 0.00 to 1.00. Moreover, the diffuse UV-visible reflectance spectra used to determine the optical band gap based on the Kubelka–Munk equation showed that an increase in x value has caused a decrease in the energy band gap and vice versa.

Effect of annealing time on structural and optical proprieties of mercury (Hg+2) doped TiO2 thin films elaborated by sol-gel method for future photo-catalytic application

Highly nanocatalytic Hg+2-doped TiO2 thin films were synthesised by a sol-gel method, deposited on silicon, and annealed at 1000 °C for different holding times (4 h, 6 h and 8 h). The morphology, structure and optical properties of the thin films were examined by X-ray Diffraction, Raman spectroscopy, Scanning electron microscopy and UV-Vis Reflectance spectroscopy. The photocatalytic potential of the thin films was evaluated via photo-degradation of methylene-blue under UV irradiation. At higher holding times, the XRD and Raman measurement displays anatase, rutile and HgTiO3 phases, with an increase of peak intensity for anatase and rutile, and the development of an HgTiO3 phase. UV-Vis reflectance spectra showed a shift in absorbance to the visible region with decrease of band gap energies. SEM revealed an increase of highly oriented nanostructures with a preponderance of nanotubes shape. With an increase of holding time to 8 h, the Hg+2-doped TiO2 thin films showed excellent photodegradation of methylene blue under UV light for 4 h, reaching 56–72%.

Retraction Notice: Synthesis and study the crystal structure of polycrystalline a novel type phase in Zn- Pb- Zr intermetallic alloy by ab initio method via powder XRD system

Zn- Pb- Zr ternary intermetallic phases were synthesized by high-temperature solid-state synthesis. Structural characterization was performed by means of powder X-ray diffraction and energy dispersive X-ray analysis. X-ray powder diffraction coupled with Rietveld refinement reveals the sample’s phase purity we have prepared. Thermal behavior analysis shows Zn0.61 Pb0.91 Zr0.138 is very stable, it doesn’t decomposition until heated up to 998 °C. UV-visible absorption and diffuse reflection spectrum feature characteristic absorption bands of d-electron transition and main group metallic alloy given an optical band gap value of 3.65 eV. Magnetic susceptibilities measurement gives significant anti- ferromagnetic interactions between magnetic centers. The results further encourage the prospects of ternary Zn-Pb-Zr alloy anodes to utilize in real energy storage applications The photo degradation experiment were performed to evaluate photocatalytic activities of Zn0.61 Pb0.91 Zr0.138 .The Rietveld refinement parameters are a=8.731(A),b=8.734(A),c=5.929(A), GOF=1.214,Rwp=31.21,Rp=21.321 having hexagonal crystal system with primitive . P 63/m c m space group.

Structural, electrical properties and photoluminescence analyses of the terbium doped barium titanate

Multifunctional materials integrating optical and electric properties into a composite or into a doped single–phase material have attracted much attention from scientists for future optoelectronic devices. In this work, polycrystalline Ba1–xTbxTiO3, x = 0.00, 0.01 and 0.05 materials were synthesized by hydrothermal route and their photoluminescence and dielectric properties were studied. The as–prepared powders showed a microstructure consisting of grains with the shape of cube; and average particle size ranging from 75 nm to 150 nm. The investigated temperature dependence of dielectric permittivity of Ba1–xTbxTiO3 ceramics revealed a decrease of the Curie temperature (Tc) with increasing terbium content, and a more pronounced degree of diffuseness of phase transition. The resistivity at room temperature was discussed in terms of positive temperature coefficient of resistance (PTRC) effect. UV–vis reflectance spectra of Ba1–xTbxTiO3 samples showed a decrease of the band gap energy with the increase of Tb amount, due to the band–gap narrowing effect. The photoluminescence spectra recorded for Tb doped BaTiO3 materials, at 80 K, evidenced the typical f–f luminescence lines of the Tb3+ accompanied the broad luminescence band at about 425 nm due to self–trapped exciton recombination. These results demonstrated that the terbium enhances the dielectric properties and photoluminescence simultaneously, being suitable for electronic applications.

Laser Induced Method to Produce Curcuminoid-Silanol Thin Films for Transdermal Patches Using Irradiation of Turmeric Target

A new possible method to produce a transdermal patch is proposed in this paper. The study refers to the pulsed laser deposition method (PLD) applied on turmeric target in order to obtain thin layers. Under high power laser irradiation of 532 nm wavelength, thin films containing curcuminoids were obtained on different substrates such as glass and quartz (laboratory investigation) and hemp fabric (practical application). Compared FTIR, SEM-EDS and LIF analyses proved that the obtained thin film chemical composition is mainly demethoxycurcumin and bisdemethoxycurcumin which is evidence that most of the curcumin from turmeric has been demethixylated during laser ablation. Silanol groups with known role into dermal reconstruction are evidenced in both turmeric target and curcuminoid thin films. UV–VIS reflection spectra show the same characteristics for all the curcuminoid thin films, indicating that the method is reproducible. The method proves to be successful for producing a composite material, namely curcuminoid transdermal patch with silanol groups, using directly turmeric as target in the thin film deposited by pulsed laser technique. Double layered patch curcuminoid—silver was produced under this study, proving compatibility between the two deposited layers. The silver layer added on curcuminoid-silanol layer aimed to increase antiseptic properties to the transdermal patch.

The first representative of a new class of charge transfer complexes in o-quinone series for organic semiconductors

The first representative of a new class of charge transfer complexes for organic semiconductors was synthesized. The reaction of p-nitroaniline (PNA) with [1,10]-phenanthroline-5,6-dione (PD) results in the formation of a stable molecular charge transfer (CT) complex PNA3-PD2 in a ratio of 3:2. The structure of the molecular CT complex PNA3-PD2 was established by X-ray diffraction studies. Using the density functional theory method, it is shown that several types of intermolecular interactions are realized in the complex: between the PNA amino group and the nitro group of another PNA molecule, carbonyl groups, and PD nitrogen atoms. Complex PNA3-PD2 is stable only in solid form. The diffuse reflectance UV–vis spectrum of PNA3-PD2 crystal powder is characterized by the intense weakly structured long-wavelength absorption band up to 650 nm. Quantum chemical calculations of the electronic structure have shown that the complex PNA3-PD2 is a straight-band semiconductor with a band gap of 2.11 eV.

Microgel-hydrogel composite photonic crystals to monitor and extract uranyl ions in aqueous solutions

We fabricate microgel-hydrogel composite photonic crystals and investigate their spectroscopic response to uranyl ion (UO22+) in aqueous solution. Upon adsorption of UO22+, the UV–visible reflection spectra of the composite photonic crystal (CPC) exhibit a peak due to Bragg diffraction, which is intense and blue shifted as compared to that of unadsorbed CPC. At low concentrations, the blue shift and intensity of the diffraction peak increases with UO22+. However, at higher concentrations of UO22+ (>600 μM), the peak shows a red-shift. Reasons for this altered behaviour of the Bragg diffraction at different UO22+ concentrations are discussed in terms of chelation of UO22+ with ligand groups in the CPC. The uranium extraction capacity of the CPC (at 600 μM, pH = 5.5) estimated using Arsenazo-III method is found to be 487 mM/kg of composite photonic crystals. Our observations indicate that microgel-hydrogel composite photonic crystals can be good candidates for extraction as well as detection of uranium, along with in situ monitoring of adsorption of uranium during extraction by simply monitoring their Bragg diffraction.

Fulgide Derivative-Based Solid-State Reversible Fluorescent Switches for Advanced Optical Memory

Fulgide Derivative-Based Solid-State Reversible Fluorescent Switches for Advanced Optical Memory

Preparation and growth mechanism of a gold-coloured Ag@AAO composite film with no angular dependence

Ag-coated anodic aluminium oxide film with a golden colour was successfully synthesized by an ultrahigh vacuum magnetron sputtering system. Free-standing Ag films were obtained by a mechanical stripping process. The results indicate that the Ag films have an ordered close-packed hexagonal pattern similar to that of the anodic aluminium oxide template. The structural colour of the sample is not derived from thin-film interference. UV–Vis reflectance spectra measurements show that the blue purple-spectrum area has a relatively strong absorption. The absorption peak indicates that the golden colour comes from localized surface plasmons. We think the reason, for the gold-coloured Ag@AAO composite film, is the periodic arrangement of Ag particles. This is also the reason why the golden colour does not change with the viewing angle. Further research shows that the Ag atoms initially grew preferentially on the hexagonal vertices of the anodic aluminium oxide template, and then Ag islands grew on the top of the anodic aluminium oxide surface, finally forming narrow Ag nanoholes on top of the wider pores of the template below, with increasing Ag sputtering time. These films show the promise of application in many areas, including decoration, display and anti-counterfeiting.

Effect of calcination temperature on the microstructure and optical properties of monodispersed self-assembled yttrium orthovanadate microspheres

Monodispersed self-assembled Eu3+-doped yttrium orthovanadate (YVO4) microspheres have been prepared by a facile hydrothermal method using trisodium citrate (Na3C6H5O7) as surfactants and complexing agents. Then the as-prepared YVO4:Eu3+ microspheres were subjected to the calcination treatment at different temperatures. The phase structure, microstructure, and optical properties of these microspheres were characterized by X-ray diffraction (XRD) and refinement analysis with GSAS-II, scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectra, UV–Vis reflectance spectrum (UV–Vis RS), and photoluminescence (PL) spectra, respectively. XRD revealed a pure tetragonal phase structure without any impurities of the as-prepared YVO4:Eu3+ microspheres. SEM images indicated that the self-assembled YVO4:Eu3+ architectures were made up of microspheres with the average diameter of around 300 nm, which were self-assembled from tiny packed nanocrystallites with 24–30 nm in diameter. Remarkably, the microstructure of these self-assembled microspheres could be well preserved during the calcination process at high temperatures. Under UV light irradiation, YVO4:Eu3+ microspheres exhibited a bright red emission corresponding to the 5D1→7F1 and 5D0→7FJ (J = 1, 2, 3, 4) transitions of the Eu3+ ions. More importantly, compared with the as-prepared YVO4:Eu3+ microspheres, the microspheres after the calcined treatment showed superior optical properties, as indicated by higher emission intensity, longer decay lifetime, and higher quantum efficiency. The present results showed that the self-assembly synthesis combined with the calcination treatment could provide a facile route to optimize the luminescent properties of inorganic functional materials.

Growth of crystalline silicon by a seed layer approach using plasma enhanced chemical vapor deposition

Different processes are used to improve the deposition of a nanocrystalline silicon layer to enhance optical absorption in different devices. The difficulty encountered lies in the reproducibility and cost of the process. In the present study, we have investigated the effect of a crystalline seed layer on the structural properties of a subsequent hydrogenated silicon (Si:H) layer (top layer). Structural properties of deposited films were investigated by absorption and Raman spectroscopy, grazing incidence X-ray diffraction measurements and spectroscopic ellipsometry. They show that using the seed layer approach promotes the structural evolution of the subsequent layer by improving its size and fraction of crystallites. UV–visible reflectance spectra simulations using Bruggeman effective medium approximation were used in order to investigate the composition evolution of the studied samples. They predict that the optical model of the elaborated layers consists of (i) the crystalline substrate (ii) the incubation layer (a mixture of amorphous silicon and voids) (iii) the bulk crystalline layer (a mixture of amorphous silicon, crystalline silicon and voids) and finally (iv) the surface layer. The incubation layer observed at the beginning of growth of the subsequent layer is absent in the optical model in the presence of the seed layer or it may be very thin in thickness, so that it has not been presented in the optical model. The optical model shows also an increase of void fraction in the top layer in the presence of the seed layer; this has been linked to the increase of crystallite size. It is noted also that the top layer is rougher in the presence of the seed layer and this has been attributed to the presence of larger silicon crystallites on its surface. Such deposition process can be used to enhance crystalline phase in absorber layer for optoelectronic devices.

UV–Visible reflectance of common light reflectors and their degradation after an ionization dose up to 100 Mrad

Light reflectors are widely used to enhance scintillation light collection. Their enhancement level depends on the reflector’s reflectance at the scintillator’s emission wavelength. We report UV–Visible reflectance spectra, relative to BaSO4, for several common reflectors. Also reported is their radiation hardness against an ionization dose up to 100 Mrad. The results of this investigation provide a reference for applications of these reflectors in a severe radiation environment.

Nanofabrication of (Cr2O3)x (NiO)1-x and the impact of precursor concentrations on nanoparticles conduct

This study aims to synthesize the (Cr2O3)x (NiO)1-x nanoparticles at lower and higher precursor values using the calcination method. There is a lack in regard to investigating the lower and higher precursor values on structural and optical properties of the (Cr2O3)x (NiO)1-x nanoparticles. To synthesize the (Cr2O3)x (NiO)1-x nanoparticles, Cr (III) acetate hydrate and Ni (II) acetate tetrahydrate were reacted with poly (vinyl alcohol). Several techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR), have been employed to characterize the synthesized sample. The XRD pattern analysis indicated that, following calcination, nanoparticle formation occurred, indicating hexagonal crystalline structures (HCP) and face-centred cubic (FCC) of (Cr2O3)x (NiO)1-x nanoparticles. FT-IR verified the existence of Ni–O and Cr–O as the original compounds of ready (Cr2O3)x (NiO)1-x nanoparticle samples. In term of average particle size, this varied from 5 to 16 nm when the precursor concentration rised from x = 0.20 to x = 0.80, as reflected in the TEM results. X-ray photoelectron spectroscopy (XPS) was employed to measure the valence state and surface composition of the prepared product nanoparticles. To identify the optical band gap using the Kubelka–Munk equation, diffuse UV–visible reflectance spectra were employed, which revealed that the energy band gap fell with a rise in the value of x. In addition, photoluminescence (PL) spectra indicated that the photoluminescence intensity was related to a directly proportional way to particle size. Hence, the results can be employed with a broad range of applications in solar cell energy applications at higher x values and antibacterial activity at lower x values.

Incorporation of Fluorescent Dyes in Electrospun Chitosan/Poly(ethylene oxide)

Polymeric films have been increasingly investigated due to the ease of miniaturization and integration in several sensor devices. Films obtained from the electrospinning technique have a controlled diameter and homogeneity, and substances can be incorporated into the polymeric network. Electrospinning fiber of chitosan (Ch) and poly(ethylene oxide) (PEO) was obtained from solutions prepared at different concentrations in acetic acid, and varying the distance and the voltage applied. The obtained films were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and UV-Visible specular reflectance spectra (UV-SRS). The best conditions for electrospinning were obtained for a 2% m/v (Ch + PEO) solution in the ratio 90:10% m/m (Ch:PEO), applied voltage of 18 kV, and 18 cm distance between the capillary tube and collector. Acridine orange, sodium fluorescein, and erythrosine fluorescence dyes were successfully incorporated into Ch:PEO films. The spectrofluorometric spectra of the films showed excitation and emission processes and the acridine orange film showed evidence of excimer formation by the presence of an excitation peak at 569 nm. Ch-PEO films with the incorporation of fluorescent dyes may well be used as flexible probes or sensors in colorimetric devices in biochemical applications.

Electrochemical Oxidation of Ti15Mo Alloy-The Impact of Anodization Parameters on Surface Morphology of Nanostructured Oxide Layers.

It is well-known that the structure and composition of the material plays an important role in the processes occurring at the surface. In this paper, a surface morphology of nanostructured oxide layers electrochemically grown on Ti15Mo, tuned by applying different anodization parameters, was investigated in detail. The one-step anodization of Ti15Mo alloy was performed at room temperature in an ethylene glycol-based electrolyte containing 0.11 M NH4F and 1.11 M H2O. Different anodization times (ranging from 5 to 60 min) and applied potentials (40–100 V) were tested, and the surface morphology, elemental content, and crystalline structure were monitored by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and X-ray diffractometry (XRD), respectively. The results showed that contrary to the multistep anodization of titanium foil, the surface morphology of anodic oxide obtained via the one-step process contains the nanoporous outer layer covering the nanotubular structure. What is more, the pore diameter (Dp) and interpore distance (Dint) of such layers exhibit different trends than those observed for anodization of pure titanium. In particular, at a certain potential range, a decrease in both Dp and Dint with increasing potential was observed. However, independently on the used anodization conditions, the elemental content of oxide layers remained similar, showing the amount of molybdenum at c.a. 15 wt.%. Finally, the amorphous nature of as-anodized layers was confirmed, and their optical band-gap was determined from the diffuse reflectance UV–Vis spectra. It was found that Eg is tunable to some extent by changing the anodizing potential. However, further thermal treatment in air at 400 °C resulted in the anatase phase formation that was accompanied by a significant Eg reduction. Therefore, we believe that the presented results will greatly contribute to the understanding of anodic formation of nanostructured functional oxide layers with tunable properties that can be applied in various fields.

Grain boundary effect on structural, optical, and electrical properties of sol–gel synthesized Fe-doped SnO2 nanoparticles

Tin oxide (SnO2) and iron-doped tin oxide (Sn1 – x Fe x O2, x = 0.05 wt%, 0.10 wt%) nanoparticles are synthesized by the simple sol–gel method. The structural characterization using x-ray diffraction (XRD) confirms tetragonal rutile phases of the nanoparticles. The variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the lattice. The compressive strain present in the lattice estimated by using peak profile analysis through using Williamson–Hall plot also exhibits the influence of grain boundary formation in the lattice. The radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum (PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary influence. Raman spectrum and the morphological analysis by using a field emission scanning electron microscope (FESEM) also indicate the formation of grain boundaries. The compositional analysis by using energy dispersive x-ray spectrum (EDAX) confirms Fe in the SnO2 lattice. The conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing, which makes the Sn1 – x Fe x O2 a potential candidate for device applications.