Nanostructured perovskite oxides – LaMO3 (M=Al, Co, Fe) prepared by co-precipitation method and their ethanol-sensing characteristics

This paper compared the effects of A. indica plant proteins over chemical methods in the morphology of zinc oxide nanoparticles (ZnO NPs) prepared by a co-precipitation method, and ethanol sensing performance of prepared thin films deposited over a fluorene-doped tin oxide (FTO) bind glass substrate using spray pyrolysis technique. The average crystallite sizes and diameters of the grain-sized cluster ZnO NPs were 25 and (701.79 ± 176.21) nm for an undoped sample and 20 and (489.99 ± 112.96) nm for A. india dye-doped sample. The fourier transform infrared spectroscopy (FTIR) analysis confirmed the formation of the Zn–O bond at 450 cm−1, and also showed the presence of plant proteins due to A. indica dye extracts. ZnO NPs films exhibited good response (up to 51 and 72% for without and with A. indica dye-doped extracts, respectively) toward ethanol vapors with quick response-recovery characteristics at a temperature of 250 °C for undoped and 225 °C for A. indica dye-doped ZnO thin films. The interaction of A. indica dye extracts helps to decrease the operating temperature and increased the response and recovery rates of the sensor, which may be due to an increase in the specific surface area, resulting in adsorption of more oxygen and hence high response results.

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Comparative Study of Pure Zno and Copper Doped Zno Nanoparticles Synthesised via Co-Precipitation Method

ScieXplore International Journal of Research in Science ◽

10.15613/sijrs/2014/v1i2/67542 ◽

2014 ◽

Vol 1 (2) ◽

pp. 73 ◽

Cited By ~ 1

Author(s):

V. Kalaiselvi ◽

N. Jayamani ◽

M. Revathi

Keyword(s):

Comparative Study ◽

Zno Nanoparticles ◽

Precipitation Method ◽

Doped Zno ◽

Co Precipitation

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Magnetic and dielectric properties of BiFeO3 nanoparticles

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v7i2.1697 ◽

2015 ◽

Vol 7 (2) ◽

pp. 1393-1403

Author(s):

Dr R.P VIJAYALAKSHMI ◽

N. Manjula ◽

S. Ramu ◽

Amaranatha Reddy

Keyword(s):

Diffuse Reflectance Spectrum ◽

Precipitation Method ◽

Secondary Phases ◽

X Ray Diffraction ◽

Bifeo3 Nanoparticles ◽

Transmission Electron ◽

Multiferroic Bifeo3 ◽

Pure Phase ◽

Simple Chemical ◽

Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM). Â Â Linear Mâˆ’H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

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