Field-emission Electron Microscopy Research Articles

Enhanced acetone-sensing properties to ppb detection level using Au/Pd-doped ZnO nanorod

ZnO nanorods doped by different amount of Au and Pd were successfully synthesized via one-step microwave-assisted hydrothermal method. The structure, morphology and composition of the as-synthesized products were characterized by X-ray diffraction (XRD), field-emission electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Gas sensors based on ZnO and Au/Pd-doped ZnO nanorods were fabricated and their gas sensing properties were tested for various gases. The results indicate that the incorporation of Au and Pd elements can greatly enhance the gas sensing properties of ZnO sensors. Specifically, the sensor based on 2.0 wt% Au-doped ZnO exhibits the highest response, quickest response and recovery characteristics, best selectivity, low operating temperature, as well as good long-term stability towards acetone. After incorporation of Au (2.0 wt%), the detection limit of Au-doped ZnO sensor decreases to 5 ppb and the response increases to 17 under 1 ppm acetone at 150℃, which is more than triple the responses of ZnO sensor. The results demonstrate that the developed Au-doped ZnO sensor has great potential for ppb-level acetone detection in human breath for diagnosing diabetes.

Synthesis and characterization of butylamine-functionalized Cr(III)–MOF–SO3H: Synergistic effect of the hydrophobic moiety on Cr(III)–MOF–SO3H in esterification reactions

Mesoporous solid acid catalysts with partially hydrophobic moieties, [Cr3O(BDC–SO3H)3−x(BDC–SO3NH3Bu)x]n, were prepared from [Cr3O(BDC–SO3H)3]n (MIL-101(Cr)–SO3H) and BuNH2 for the first time and then characterized by the Brunauer–Emmet–Teller (BET) technique, powder X-ray diffraction, field emission electron microscopy, Fourier transform infrared spectroscopy, and thermal and elemental analyses. The nitrogen adsorption–desorption study showed that the specific surface area and total pore volume of MIL-101(Cr)–SO3H decreased after the reaction with butylamine and formation of [Cr3O(BDC–SO3H)3−x(BDC–SO3NH3Bu)x]n. The prepared materials were used as catalysts to investigate the impact of hydrophobic moieties in esterification yields of phthalic anhydride with several alcohols as a probe reaction. The presence of butylamine as a hydrophobic group on MIL-101(Cr)–SO3H increases the esterification yield significantly for hydrophilic alcohols under solvent-free conditions. Moreover, results showed that [Cr3O(BDC–SO3H)3−x(BDC–SO3NH3Bu)x]n can be recovered and reused for several consecutive reactions without significant loss in catalyst activity.

Characterization of Nano-SiC Powder Prepared by High-Energy Ball Milling as a Mechanochemical Process with Subsequent Annealing Process

SiC nano-powder compound was prepared by mechanochemical process followed by annealing. Phase evaluation and microstructural changes of the powders during the processes were examined by X-ray diffraction, field emission electron microscopy and transmission electron microscopy analyses. Necessary milling times for initial and perfect formation of SiC nano-powder were 50 and 70 hours, respectively. The mean particles size of specimens annealed via FE-SEM images with 70 hours of milling was found to be less than 100 nm.

Deposition of Ni(OH)2 on nickel substrate using vacuum kinetic spray and its application to high-performance supercapacitor

Herein, we report a direct deposition of nano-structured Ni(OH)2 from micro-sized Ni(OH)2 powder on nickel sheet and nickel foam using nano-particle deposition system, one of the low-vacuum and room temperature vacuum kinetic spray processes. In this work, the deposition of the Ni(OH)2 powder on nickel sheets is carried out with various stand-off-distances (SoDs) and carrier gas pressures. The deposited films are investigated by field-emission electron microscopy, X-ray diffraction, and Raman spectroscopy. The crystallite size of the nano-structured Ni(OH)2 depends on the SoD and the carrier gas pressure. The electrochemical performance of Ni(OH)2 deposited on nickel sheets is measured by cyclic voltammetry in the 3-electrode cell. The deposition with 5 mm SoD and 0.3 MPa carrier gas pressure is found to be the optimum deposition condition for the nano-structured Ni(OH)2 thin film as an electrode material. The nano-structured Ni(OH)2 thin film deposited with 5 mm SoD and 0.3 MPa carrier gas pressure on nickel foam demonstrates a specific capacitance of 2377 F g−1 at 2 mV s−1 scan rate and 2092 F g−1 at 1 A g−1 current density and excellent cyclic stability for 3000 cycles with 83% capacitance retention.

Growth of Fe doped ZnO nanoellipsoids for selective NO2 gas sensing application

In this work, Undoped ZnO and Fe-doped ZnO nanostructures were successfully synthesized by using the simple hydrothermal method and their structural, morphological by various characterization techniques and studied the gas sensing properties. The Field emission electron microscopy (FE-SEM) observed that the nanorods assembled together to form the flower like in undoped ZnO and after Fe doping it turns into nanoellipsoid like morphology. NO2 gas response analysis revealed that Fe-doped ZnO nanoellipsoids displayed a higher selectivity compared to undoped ZnO. Among the different doping concentration 8 wt% exhibited the highest response of 209.8 when exposed to 100 ppm concentration of NO2.

Simultaneous green synthesis and in-situ impregnation of silver nanoparticles into organic nanofibers by Lythrum salicaria extract: Morphological, thermal, antimicrobial and release properties.

This research has revealed the promising, green and one-pot approach for fabrication of antimicrobial nanohybrids based on organic nanofibers including cellulose (CNF), chitosan (CHNF), and lignocellulose (LCNF) nanofibers impregnated with silver nanoparticles (AgNPs). Lythrum salicaria extract was used as a reducing agent as well as a capping agent. Formation of the spherical AgNPs ranging between 45 and 65 nm was proved by UV-Vis spectroscopy, transmission electron microscopy (TEM), and dynamic light scattering (DLS). Biomaterials supported AgNPs were characterized and compared for their morphological, thermal, release, and antimicrobial properties. The considerable influence of the phenolic compounds of L.salicaria extract on the synthesis and uniform distribution of AgNPs on nanofibers was confirmed by field emission electron microscopy (FE-SEM). Energy dispersive X-ray spectroscopy (EDX) and ICP-OES analysis of nanohybrids, reflected a high loading capacity for LCNF and also CHNF in contrast to CNF. The release of AgNPs from LCNF substrate was lower than other nanofibers but the order of antimicrobial activity of nanohybrids against E.coli and S.aureus was as this: CHNF ˃ LCNF ˃ CNF. Generally, this research suggested that the efficiency of CHNF and LCNF as immobilizing support of AgNPs is higher than CNF and L.salicaria extract was proposed as a high potential reducing and capping agent.

Influence of growth duration and nitrogen-ambient on the morphological and structural properties of beta-gallium oxide micro- and nanostructures

Micro- and nanostructures of gallium oxide (Ga2O3) were prepared on silicon substrate by the hydrogen-reduction chemical vapor deposition (HR-CVD) technique. We investigated the influence of synthesis duration and growth ambient on the surface morphology, crystal structure and band gap of the grown films by using field emission electron microscope (FESEM), high resolution X-ray diffraction (HR-XRD) and ultraviolet–visible spectrophotometer (UV–vis), while elemental composition was confirmed by energy dispersive X-ray spectroscopy (EDS). Dwell time was found to enhance step coverage of the substrate and also improve the X-ray diffraction peaks. Films fabricated under nitrogen-flowing ambient were observed to have regular shape but with less dense structures, lower Ga/O atomic ratio, weaker XRD peak intensity, and increasing band gap; while samples deposited in N2-deficient environment had characteristics opposite to those of their counterpart. Band gap of films were observed to decrease with increasing film density and Ga/O atomic ratio.

Influence of deposition angle on nano-structure, optical and electrical properties of copper azide (CuN3) thin films

Cu/glass films of 100 (nm) thicknesses were deposited at 0° and 40° and post annealed at three different temperatures with flow of nitrogen. XRD patterns of the films deposited at 40° confirmed formation of CuN3 phase which is due to higher void fraction in these films. Optical properties of the produced samples were obtained using the Bruggeman homogenization method. Results of optical properties of these films showed that the dispersion behavior is sensitive to the annealing temperature, polarization of the incident light and film deposition angle. Clear energy loss peak is obtained for film deposited at 0° and annealed at 350 °C using both s- and p-polarized incident lights with a shift to lower energies for p-polarized incident light. Appearance of these peaks are related to the values of the dielectric functions and the structure of the sample which consists of almost evenly distributed conical shapes with sharp tips leading to the enhancement of plasmon resonances and the corresponding frequency in this sample. The surface morphology of the produced samples was analyzed by means of field emission electron microscope and atomic force microscope. Variation of grain size with annealing temperature is observed which can be due to competition between two processes of diffusion and penetration of nitrogen atoms/molecules in the body of the grains.

Ternary transition metal chalcogenides decorated on rGO as an efficient nanocatalyst towards urea electro-oxidation reaction for biofuel cell application

A ternary transition metal chalcogenide, containing MoS2, NiS, and Co3S4 (MCNS), and MCNS/reduced graphene oxide (MCNS/rGO) composite were prepared as anode catalysts by a simple hydrothermal process for Urea electro-oxidation. It's expected that rGO with high specific surface area provides superior catalytic performance for MCNS/rGO than MCNS. Also, the synergic effect of Mo, Ni, and Co in the composite accelerates the urea oxidation and enhances the performance of the catalyst. The composites were characterized by field emission electron microscopy, transition electron microscopy, and X-ray diffraction spectroscopy. Electrochemical properties of composites were evaluated by cyclic voltammetry. The MCNS/rGO demonstrated superior electrocatalytic performance than the MCNS catalyst. The incorporating of rGO into MCNS creates a high electrochemical surface area for urea electro-oxidation that resulted in a higher current density (18 mA cm−2) than MCNS (3.7 mA cm−2) at the presence of 0.6 M urea and the scan rate of 20 mV s−1. The maximum current density obtained 43 mA cm−2 for MCNS/rGO at the scan rate of 70 mV s−1 in room temperature. Also, single cells based on MCNS and MCNS/rGO supplied a maximum power density of 7.7 mW cm−2 and 21.0 mW cm−2 at room temperature, respectively. Hence, MCNS/rGO can be a favorable electrocatalyst for application in the direct urea fuel cell.

Achieving exceedingly constructional characterization of magnesia-yttria (MgO-Y2O3) nanocomposite obtained via oxalate precursor strategy

Magnesium yttrium oxide (MgO-Y2O3) nanocomposites have been purposefully tailored using an oxalate precursor pathway. Commonly, MgO-Y2O3 nanocomposites possessed a significant technological challenge in electroceramics; particularly remarkable as the anode material for solid oxide fuel cells (SOFC). In this regard, different weight ratios, % of MgO and Y2O3 including (20:80), (50:50) and (80:20) were fabricated based on oxalic acid as a fuel in acidic medium. Indeed, the impact of the annealing temperature on the phase composition, crystallite size, morphology and optical properties was investigated using X-ray diffraction, field emission electron microscope (FESEM), TEM, FTIR and UV–VIS-NIR spectrophotometer. The FESEM results showed the nanocomposite had a cubic like structure with the fine grain sizes of 0–150 nm because of the rapid solidification. The band gap energy was found to be 4.83, 5.10 and 5.08 eV with increasing the ratio of Mg2+ ion from 20 to 50 and 80, respectively. Eventually, our currently studies consider to be an important achievement to investigate and recognize the features of the MgO-Y2O3 system for different applications involving microwave systems, advanced displays (field emission display, plasma display, electroluminescent display), ultra-fast sensors, durable, infrared windows and lasers.

Breakdown characteristics of polyethylene/silicon nitride nanocomposites

Silicon nitride (Si3N4) has been utilized as a nanofiller in polymeric insulation due to its good characteristics in both electrical insulation and thermal conduction properties. In this work, a comparative study was performed between unfilled polyethylene and polyethylene containing different amounts of Si3N4 nanofiller. The study showed that the low density polyethylene (LDPE) added with 15 wt% of Si3N4nanofiller could have higher breakdown strength compared to equivalent LDPE with 10 wt% of Si3N4nanofiller. Morphological characterizations of the nanocomposite samples were performed using field emission electron microscopy (FESEM) and the results showed that the breakdown performance of the investigated materials were affected by the agglomeration of Si3N4 nanoparticles.

Tuning of photoluminescence intensity of europium doped sodium yttrium fluorides synthesized via hydrothermal route

Hydrothermal synthesis of pure, europium doped sodium yttrium fluoride (NaYF4: Eu3+) and NaYF4: Eu3+@NaGdF4 core–shell nanostructures by using trisodium citrate as chelating agent is reported. The control of nanostructure morphology as function of heating time intervals under same reaction condition at 180 °C has been achieved. The synthesized nanostructures were characterized by powder X-ray diffraction (PXRD), Rietveld refinenement, field emission electron microscopy, transmission electron microscopy, infrared spectroscopy, and energy dispersive X-ray spectroscopy. PXRD analysis reveals that all synthesized nanostructures have hexagonal phase without any impurity. Thermogravimetric analysis suggests appreciable thermal stability of synthesized lanthanide doped fluorides and core–shell nanostructures. Photoluminescence spectra of the as synthesized nanocomposites were investigated in details which indicate that the emission intensities are modulated by the morphology of nanostructures which in turn is regulated by varying heating time intervals.

Synthesis of hydroxyapatite via phase transformation of calcium hydrogen phosphate dihydrate: Effects of temperature variation on phase and morphology

In this study, hydroxyapatite (HA) was synthesized via dissolution-precipitation reaction of calcium hydrogen phosphate dihydrate (CaHPO4·2H2O; DCPD) and calcium hydroxide (Ca(OH)2) by hydrothermal process in distilled water. The hydrothermal treatment temperatures were varied (100, 150 and 200 °C) and the effects of this variation on the formation of HA phase and its morphology were investigated. The transformation rate for DCPD to HA was evaluated using X-ray diffraction (XRD) analysis. The morphology of the synthesized HA was observed using field emission electron microscope (FESEM) and transmission electron microscope (TEM). The elemental compositions were analysed by energy dispersive X-ray spectroscopy (EDS). Observation show that different morphologies of HA were obtained with different hydrothermal treatment temperatures. HA nanorods were obtained at lower temperatures (100 and 150 °C) while hexagonal and nanospherical shapes were formed at a higher temperature (200 °C). The crystallinity of HA obtained at the different temperatures were in the range of 50–57% which is similar to the crystallinity of bone minerals (51–57%). It was observed that lower hydrothermal treatment temperatures (150 and 100 °C) yielded nanorod shaped HA with crystallite size of 40–60 nm length and 20 nm diameter which is suitable for clinical applications.

Inhibitory effects of tangeretin on osteoclastogenesis and titanium particle-induced osteolysis

Objective To explore the effects of tangeretin on osteoclastogenesis and bone resorption. Methods Primary bone marrow mononuclear macrophages were isolated and purified from C57BL/6 mice, and different concentrations of tangeretin were added for co-culture. Cell count kit (CCK-8) method was used to detect the cytotoxicity of tangeretin. Macrophage-colony stimulating factor (M-CSF) and receptor activator of nuclear factor-κB ligand (RANKL) were used to induce the differentiation of primary bone marrow mononuclear macrophages into osteoclasts. No tangeretin was given in the control group, and different concentrations of tangeretin (3.125, 6.250 μmol/L) were added in the experimental groups. The number of osteoclasts was counted by tartrate resistant acid phosphatase (TRAP) staining. Cells were planted on bone slices and treated with different concentrations of tangeretin until osteoclasts formed, and bone slices were imaged and analyzed using field-emission scanning electron microscopy. Twenty mice were randomly assigned to four groups (n=5 for each): sham PBS control (sham), Ti particles with PBS (vehicle), and Ti particles with low [10 mg/(kg·day)] or high [20 mg/(kg·day)] concentrations of tangeretin. After 14 days, the effects of tangeretin on osteoclasts in vivo were studied using the titanium particle-induced calvarial osteolysis model. Results Tangeretin cytotoxicity was concentration-dependent. Cell viabilities at 6.250, 12.500 and 25.000 μmol/L of tangeretin were not significantly different from those in the control group (P>0.05). The maximum concentration used in our study was 25.000 μmol/L, which was proven to have no cytotoxic effects on primary bone marrow mononuclear macrophages. Compared to the control group, the number of TRAP positive multinucleated osteoclasts in tangeretin 3.125 μmol/L group (P<0.01) and 6.250 μmol/L group (P<0.01) was significantly decreased. Similarly, the bone resorption area in tangeretin 3.125 μmol/L group (P<0.01) and 6.250 μmol/L group (P<0.01) was also significantly decreased. The In vivo results showed significant osteolysis of the skull in the control group compared to the sham group (P<0.01). As compared with the control group, the osteolysis was significantly inhibited in both the low-concentration tangeretin group (P<0.01) and the high-concentration tangeretin group (P<0.01), and the degree of osteolysis in the high-concentration tangeretin group was significantly lower than that in the low-concentration tangeretin group (P<0.01). Conclusion Tangeretin could inhibit the osteoclastogenesis and osteolysis. Key words: Tangeretin; Osteoclasts; Bone resorption; Osteoporosis

Photocatalytic degradation of ethylene by TiO2 nanotubes/ reduced graphene oxide prepared by gamma irradiation

A nanocomposite photocatalyst of TiO2 nanotubes/reduced graphene oxide (rGO-TNTAs) were prepared by γ-ray radiolysis. The rGO-TNTAs were studied for photocatalytic decomposition of ethylene (C2H4) in a refrigerated environment. Degradation efficiency of ethylene by these materials was described by the apparent first-order rate constant (K). The composite was characterized by Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), Atomic force microscopy (AFM) and Field emission electron microscopy (FESEM). The preparing parameters for materials affecting the degradation efficiency in terms of the rate constant were studied, including the GO addition and the irradiation dose. The results showed that (1) gamma irradiation can induce GO to partial rGO, the rGO surface of rGO-TNTAs was smooth and loosely lamellar structure. (2) The K of the rGO-TNTAs is highly dependent on the GO addition and the irradiation dose. With a GO addition of 0.1 g and an irradiation dose of 20 kGy, the maximum K value of rGO-TNTAs could be obtained under the experimental conditions. (3) From analysis of the Raman spectroscopy spectrum, optimum changes had occurred in the intensity ratio of D-band to G-band of the GO that had been γ-ray-irradiated with a dose of 20 kGy, resulting in the K of rGO-TNTAs increased by 40.9% compared with that of TNTAs.

A novel technique to generate aluminum nanoparticles utilizing ultrasound ablation.

In the present article, a novel method of ultrasound ablation technique is presented with the experimental results for the generation of the aluminum nanoparticles. The formation of the aluminum nanoparticle is confirmed by; the powder X-ray diffraction (XRD), the field emission electron microscopy (FESEM), the atomic force microscopy (AFM) and transmission electron microscopy (TEM). The most probable particle size of nanoparticles produced by this method is 44.7 and 105.7 nm for two different ultrasonic power of 20 W and 50 W respectively. The ultrasonic ablation method is an innovative method for the production of aluminum nanoparticles. In this method, the fast movement sanding by an ultrasonic apparatus converts aluminum foil to nanoparticles. The most important advantages of this method are green, fast, controllable, and high purity of the produced nanoparticle.

Casein and Ag nanoparticles: Synthesis, characterization, and their application in biopolymer‐based bilayer film

In the present investigation, casein nanoparticles and silver nanoparticles (AgNPs) were synthesized separately and the synthesized nanoparticles were incorporated into the bilayer film. Casein nanoparticles were produced using desolvation techniques, whereas AgNPs were synthesized using casein protein. The synthesized nanoparticles were characterized by scanning electron microscope (SEM), field emission electron microscope (FESEM), and UV–Visible spectra. UV spectra and SEM revealed that the pH had a significant effect on the size of both casein nanoparticles and AgNPs. AgNPs, synthesized at pH 13, were spherical in shape with average particle size of 10–25 nm and were stable up to 80 days. All the synthesized AgNPs showed 7–14 mm of zone of inhibition against growth of Escherichia coli. Incorporation of AgNPs and casein nanoparticles into sodium alginate/casein bilayer film improved the oxidative stability of packed almond oil during storage. Peroxide value of oil was increased from 8.02 meq/kg to 11.5 meq/kg only when stored in nanoparticles containing biopolymer film. Practical applications Edible film is a better alternative of plastic materials, but poor shelf life and mechanical properties of the film restrict the application of edible films in food Industries. Incorporation of antibacterial agent can improve the shelf life of biodegradable film. So, in present investigation, casein nanoparticles and AgNPs were synthesized separately. Casein nanoparticles were produced using desolvation techniques, whereas AgNPs were synthesized through mediation of casein protein. Synthesized nanoparticles were characterized by SEM, FESEM, and UV–Visible spectra. The synthesized nanoparticles were incorporated into pectin–sodium alginate/casein bilayer film. Incorporation of AgNPs and casein nanoparticles in bilayer improved the oxidative stability of almond oil during storage.

Mechanical and corrosion behavior of Cu, Cr, Ni and Zn electroplating on corten A588 steel for scope for betterment in ambient construction applications

In this study, copper (Cu), chromium (Cr), nickel (Ni), and zinc (Zn) are deposited onto corten A588 grade steel by electroplating technique. After depositing the coating, microstructure, micro-hardness and surface morphology are studied. This is done through X-ray diffraction (XRD), Vickers hardness and field emission scanning and electron microscopy (FESEM) respectively. The XRD and EDS reveals the presence of Cu, Cr, Ni and Zn elements in the respective coatings and the highest micro hardness of 1918.1HVN is observed in Cr coated corten A588 substrate. Electrochemical impedance spectroscopy (EIS) is studied to find the corrosion behavior of coated and uncoated samples. EIS studies shows that chromium electroplated steel exhibit superior corrosion resistance (Ecorr – 1.742 V; Icorr – 0.334 mA) properties rather than Cu, Ni, Zn coatings and uncoated corten A588 substrate. The weight loss analysis is also performed on coated and uncoated samples with 3.5% NaCl for a week and the results exhibit minimum weight loss in Cr coated corten A588 samples. Hence, the study reveals that the Cu, Cr, Ni and Zn coated corten A588 samples is the suitable candidature for construction applications.

Synthesis of Silica-Coated Silver-Cobalt Ferrite Nanoparticles for Biomedical Applications

In this work, a series of silver-substituted cobalt ferrite (AgxCo1-xFe2O4, 0 ≤ x ≤ 0.1) nanoparticles (NPs) were synthesized, and then a sample with monophase structure and optimum magnetic properties was coated with an amorphous silica layer. First, Ag-substituted Co-ferrite NPs were synthesized via a sol-gel auto combustion method from aqueous metal nitrates solutions. Then, all the powders were characterized by several techniques such as X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), and vibrating sample magnetometry (VSM). These results showed that when the Ag content was between 0 and 0.08, the synthesized powders were the cubic spinel structure, having spherical-shaped particles with an average size of about 20–25 nm. Afterward, the silica coating was applied on the surfaces of the selected sample (i.e., Ag0.08Co0.92Fe2O4 NPs with monophase structure and optimum magnetic properties) by a sol-gel approach based on the Stober process from the tetraethyl orthosilicate (TEOS) as the precursor of silica. Transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, and zeta potential investigations were used to study the characteristics of the silica-coated Ag-Co-ferrite NPs. The results of FTIR and TEM analyses confirmed the presence of the silica coating on the surfaces of the Ag-Co-ferrite NPs. Although the silica-coated sample showed the saturation magnetization (MS) value slightly lower than that of the uncoated one, however, its magnetic properties are suitable for use in different biomedical applications. Also, a water-based suspension containing the silica-coated Ag-Co-ferrite NPs showed a more negative zeta potential value at the pH of 7 in comparison with a suspension containing uncoated ones. Therefore, it can be concluded that the synthesized silica-coated Ag0.08Co0.92Fe2O4 NPs in this study could be considered as a good candidate for the preparation of biomedical ferrofluids.

Size dependent morphology, magnetic and dielectric properties of BiFeO3 nanoparticles

AbstractNano-sized BiFeO3 were synthesized by sol-gel auto combustion method and report the effect of different annealing temperature (400 °C, 500 °C, 600 °C) on phase formation, morphology, magnetic and dielectric properties of synthesized bismuth ferrite (BiFeO3) nanoparticles. The phase formation of BFO nanoparticles were confirmed by X-ray diffraction pattern. Further, significant increment in particle size with increasing annealing temperature was estimated by field emission electron microscopy (FESEM). Magnetization curve showed the soft ferromagnetic behavior of the samples annealed at 400 OC and 500 OC that was explained on the basis of disturbance of spiral modulated long range antiferromagnetic order of bulk BFO. Dielectric response revealed decrease in dielectric constant with increasing annealing temperature. BFO is a room-temperature multiferroic material so it is potential candidate for various applications viz. Water waste treatment, gas sensors and photovoltaic cells in rural areas.