@article { ISI:000250085300004, title = {One-step preparation of nanosized Ag-PdCo-powder and its alloy formation at low temperature}, journal = {Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry}, volume = {37}, number = {7}, year = {2007}, month = {SEP}, pages = {531-539}, publisher = {TAYLOR \& FRANCIS INC}, type = {Article}, address = {325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA}, abstract = {

Nano-sized silver-palladium co-powder has been synthesized from silver nitrate-palladium chloride by wet chemical method. The present experimental conditions are applied for the first time for Ag-Pd co-powders wherein sodium formaldehyde sulfoxylate (SFS) has been used as an external reducing agent to simultaneously reduce respective metal salts. SFS reduces the metal salts at room temperature thus prevents formation of bigger particles of the respective metals in co-powder. Powder X-ray diffraction measurements ( XRD) and Transmission electron microscopy ( TEM) suggest the formation of nano-sized Ag-Pd co-powder with particle diameter in the range of about 25 nm. SEM shows that the powder morphology changes with temperature. Heat treatment of 90: 10 (Ag:Pd) composition showed shift in XRD peaks indicating alloy formation of Ag/Pd at lower temperature. Thick-films generated by use of the co-powder resulted in Ag/Pd alloy at about 500 degrees C as confirmed by the XRD. Thermal analysis showed that Ag/Pd co-powders initially gain the weight due to oxidation followed by the weight loss.

}, keywords = {alloy, Chemical synthesis, nano-powder, noble metal, Transition Metal}, issn = {1553-3174}, doi = {10.1080/15533170701563707}, author = {Khanna, P. K. and Singh, N. and Kulkarni, D. and Marimuthu, R. and Charan, Shobhit and Patil, K. R. and Jain, G. H.} } @article { ISI:000244765100003, title = {Studies on gas sensing performance of pure and modified barium strontium titanate thick film resistors}, journal = {Bulletin of Materials Science}, volume = {30}, number = {1}, year = {2007}, month = {FEB}, pages = {9-17}, publisher = {INDIAN ACADEMY SCIENCES}, type = {Article}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, abstract = {

Barium strontium titanate ((Ba0.87Sr0.13)TiO3-BST) ceramic powder was prepared by mechanochemical process. The thick films of different thicknesses of BST were prepared by screen-printing technique and gas-sensing performance of these films was tested for various gases. The films showed highest response and selectivity to ammonia gas. The effect of film thickness on gas response was also studied. As prepared BST thick films were surface modified by dipping them into an aqueous solution of titanium chloride (TiCl3) for different intervals of time. Surface modification shifted response to H2S gas suppressing the responses to ammonia and other gases. The surface modification, using dipping process, altered the adsorbate-adsorbent interactions, which gave the unusual sensitivity and selectivity effect. Sensitivity, selectivity, thermal stability, response and recovery time of the sensor were measured and presented.

}, keywords = {(Ba0.87Sr0.13)TiO3 thick films, ammonia gas sensor, II2S gas sensor, selectivity, sensitivity}, issn = {0250-4707}, doi = {10.1007/s12034-007-0003-z}, author = {Jain, G. H. and Patil, L. A. and Patil, P. P. and Mulik, Uttam P. and Patil, K. R.} } @article { ISI:000305039700151, title = {Sono-chemical synthesis of ZnO nano-particles and their application in hydrogen sulphide gas sensing}, journal = {Journal of Nanoscience and Nanotechnology}, volume = {12}, number = {3}, year = {2012}, month = {MAR}, pages = {2791-2796}, publisher = {AMER SCIENTIFIC PUBLISHERS}, address = {26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA}, abstract = {

Herein we describe synthesis of ZnO nanoparticles by using alkaline solution of ZnX2 (X = NO3, Cl) under ultrasound energy of 20 KHz. The reaction can be completed in about 1-2 hours. As prepared powders were analyzed by XRD measurement to find that the product is hexagonal phase pure ZnO. UV-Visible measurement of aq. solution showed absorption band at similar to 365 nm and photoluminescence (PL) indicated multiple bands in visible region due to deep traps owing to high temperature sintering. The hydrophilicity can be imparted by use of a suitable polyelectrolyte. Freshly prepared samples showed good dispersion in aqueous and alcoholic medium. The thick films derived from the ZnO nano-particles showed excellent sensing for hydrogen sulphide gas.

}, keywords = {Gas-Sensing, Sono-Chemical, synthesis, ZnO Nano-Particles}, issn = {1533-4880}, doi = {10.1166/jnn.2012.5732}, author = {Khanna, P. K. and Kate, Kunal and Dhanabalan, K. and Banerjee, Shaibal and Reji, Nedunnkandathil and Shinde, S. D. and Jain, G. H.} }