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Cobalt Incorporated Pyramidal Shaped α-Fe₂O₃ Nanoparticles from Poly-vinyl Alcohol Based Precursor

Advances in Nanoparticles 2016年第1期5卷 9-17页

作者： Atanu Naskar Susanta Bera Awadesh Kumar Mallik sunirmal jana Sol-Gel Division CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI) P.O. Jadavpur University Kolkata India Bioceramic and Coating Division CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI) P.O. Jadavpur University Kolkata India

Precursor foam based Co incorporated α-Fe2O3 (AFC) was successfully synthesized at 600℃ calcination temperature by simple solution method using PVA. The formation of α-Fe2O3 nanoparticles was confirmed by X-ray diffraction measurement and reduction in crystallite size was found after cobalt incorporation. Field emission scanning electron microscopy revealed the existence of pyramidal shaped iron oxide in AFC. FTIR and Raman spectra also confirmed the presence of α-Fe2O3. Photocatalytic activity study showed that the cobalt incorporated α-Fe2O3 was better photocatalyst than pure α-Fe2O3. The cobalt incorporated iron oxide nanoparticles could be used for drug delivery application and this simple preparation method could be adopted for the synthesis of other transition metal oxides.

关键词： Sol-Gel Based Foam α-Fe2O3 Nanoparticles Polyvinyl Alcohol Catalytic Activity

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Experimental Study of Perfectly Patterned Silica-Titania Optical Waveguide

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Photonic Sensors 2012年第1期2卷 81-91页

作者： Rimlee DEB ROY Devika SIL sunirmal jana Prasanta Kumar BISWAS Shyamal Kumar BHADRA Fiber Optics & Photonics Division Central Glass & Ceramic Research Institute 196 Raja S. C. Mullick Road Jadavpur Kolkata-700 032 India Sol-Gel Division Central Glass & Ceramic Research Institute 196 Raja S. C. Mullick Road Jadavpur Kolkata-700 032 lndia Department of Chemistry Temple University Philadelphia PA 19122 USA

Inorganic silica-titania thin films with thicknesses 150 nm-200 nm are deposited on high purity and polished silicon wafer and silica glass substrates by sol-gel dipping process and are patterned by capillary force lithography technique. Subsequently grating structure is embossed in green stage. The patterned gel films are subjected to stepwise heat treatment to 500 ℃ and above in pure oxygen atmosphere in order to achieve major conversion of mixed-gel to oxide optical films which are characterized by Ellipsometry, Fourier transform infrared spectroscopy （FTIR） and atomic force microscopy （AFM） to optimize the fabrication parameters and to get perfectly matched film. Removal of organics and formation of perfectly inorganic silica-titania network at optimized heat treatment in controlled environment are ensured by FTIR spectral study. The difference in refractive indices between the substrate and coated film as developed waveguides for operating wavelength show the planar waveguide behavior of the films. calculated theoretically matches exactly with the （632.8 nm） and the measured optical properties

关键词： Optical properties sol-gel technique thin films oxides

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