02051nas a2200277   4500008004100000022001400041245009600055210006900151260008600220300001200306490000700318520111200325653001001437653002301447653001601470653001601486653002101502100001901523700001401542700001701556700001801573700002001591700001801611700001701629856012701646       2007                        eng d  a1553-317400aOne-step preparation of nanosized Ag-PdCo-powder and its alloy formation at low temperature0 aOnestep preparation of nanosized AgPdCopowder and its alloy form  a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcSEP  a531-5390 v373 a<p>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.</p>10aalloy10aChemical synthesis10anano-powder10anoble metal10aTransition Metal1 aKhanna, P., K.1 aSingh, N.1 aKulkarni, D.1 aMarimuthu, R.1 aCharan, Shobhit1 aPatil, K., R.1 aJain, G., H.  uhttps://library.ncl.res.in/content/one-step-preparation-nanosized-ag-pdco-powder-and-its-alloy-formation-low-temperature-001870nas a2200253   4500008004100000022001400041245010700055210006900162260010500231300000900336490000700345520093600352653003501288653002301323653002001346653001601366653001601382100001701398700001801415700001801433700002101451700001801472856012601490       2007                        eng d  a0250-470700aStudies on gas sensing performance of pure and modified barium strontium titanate thick film resistors0 aStudies on gas sensing performance of pure and modified barium s  aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACADEMY SCIENCEScFEB  a9-170 v303 a<p>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.</p>10a(Ba0.87Sr0.13)TiO3 thick films10aammonia gas sensor10aII2S gas sensor10aselectivity10asensitivity1 aJain, G., H.1 aPatil, L., A.1 aPatil, P., P.1 aMulik, Uttam, P.1 aPatil, K., R.  uhttps://library.ncl.res.in/content/studies-gas-sensing-performance-pure-and-modified-barium-strontium-titanate-thick-film01713nas a2200265   4500008004100000022001400041245010500055210006900160260009200229300001400321490000700335520076800342653001601110653001801126653001401144653002301158100001901181700001601200700001901216700002201235700002601257700001901283700001701302856012801319       2012                        eng d  a1533-488000aSono-chemical synthesis of ZnO nano-particles and their application in hydrogen sulphide gas sensing0 aSonochemical synthesis of ZnO nanoparticles and their applicatio  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScMAR  a2791-27960 v123 a<p>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.</p>10aGas-Sensing10aSono-Chemical10asynthesis10aZnO Nano-Particles1 aKhanna, P., K.1 aKate, Kunal1 aDhanabalan, K.1 aBanerjee, Shaibal1 aReji, Nedunnkandathil1 aShinde, S., D.1 aJain, G., H.  uhttps://library.ncl.res.in/content/sono-chemical-synthesis-zno-nano-particles-and-their-application-hydrogen-sulphide-gas-0