02200nas a2200229 4500008004100000022001400041245009100055210006900146260007300215300001400288490000700302520140100309653001401710653001501724653001901739653002201758653000801780100002401788700001901812700002201831856011701853 2008 eng d a0039-914000aControlled synthesis of ZnO from nanospheres to micro-rods and its gas sensing studies0 aControlled synthesis of ZnO from nanospheres to microrods and it aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN a1315-13190 v753 a

1D ZnO rods are synthesized using less explored hydrazine method. Here we find, besides being combustible hydrazine can also be used as a structure-directing agent. The ratio of zinc nitrate (ZN) to hydrazine is found to control the morphology of ZnO. At lower concentration of ZN as compared with hydrazine the morphology of ZnO is found to be spherical. As we increase the hydrazine content the morphology changes from spherical (diameter similar to 100 nm) to the elongated structures including shapes like Y, T as well dumbbell (diameter similar to 40 nm and length similar to 150 nm). Interestingly for more than 50% of hydrazine ZnO micro-rods are formed. Such rods are of diameter similar to 120 mn having length of about 1 mu m for ZN to hydrazine ratio of 1:9, isolated as well as bundle of rods are seen in scanning electron microscopy (SEM). The X-ray diffraction (XRD) reveals the phase formation with average particle size of 37 nm as calculated using Scherrer's formula. The high-resolution transmission electron microscopy (HRTEM) is also done to confirm the d-spacing in ZnO. Gas sensing study for these samples shows high efficiency and selectivity towards LPG at all operating temperatures. Photoluminescence (PL) study for these samples is performed at room temperature to find potential application as photoelectric material. (C) 2008 Elsevier B.V. All rights reserved.

10aHydrazine10aLPG sensor10aNanostructures10aphotoluminescence10aZnO1 aNavale, Shalaka, C.1 aGosavi, S., W.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/controlled-synthesis-zno-nanospheres-micro-rods-and-its-gas-sensing-studies-002154nas a2200265 4500008004100000022001400041245005700055210005600112260006900168300001200237490000800249520136900257653002001626653000801646653000801654653001501662653000801677100002401685700001301709700001701722700002201739700001901761700002101780856008701801 2008 eng d a0925-400500aEPR and DRS evidence for NO2 sensing in Al-doped ZnO0 aEPR and DRS evidence for NO2 sensing in Aldoped ZnO aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR a668-6730 v1303 a

Zinc oxide (ZnO) is a well-known semiconducting multifunctional material wherein properties right from the morphology to gas sensitivity can be tailor-made by doping or surface modification. Aluminum (Al)-incorporated porous zinc oxide (AI:ZnO) exhibits good response towards NO2 at low-operating temperature. The NO2 gas concentration as low as 20 ppm exhibits S = 17% for 5 wt. % Al-incorporated ZnO. The NO2 response increases with operating temperature and concentration and reaches to its maximum at 300 degrees C without any interference from other gases such as SO3, HCl, LPG and alcohol. Physico-chemical characterization likes differential thermogravimetric analysis (TG-DTA) electron paramagnetic resonance (EPR) and diffused reflectance spectroscopy (DRS) have been used to understand the sensing behavior for pure and A]-incorporated ZnO. The TG-DTA depicts formation of ZnO phase at 287 degrees C. The EPR study reveals distinct variation for O- (g=2.003) and Zn interstitial (g = 1.98) defect sites in pure and Al:ZnO. The DRS studies elucidate signature of adsorbed NO, species in aluminium-incorporated zinc oxide indicating its tendency to adsorb these species even at low temperatures. This paper is an attempt to correlate the gas sensing behavior with the physico-chemical studies such as EPR and DRS. (c) 2007 Published by Elsevier B.V.

10aaluminum doping10aDRS10aEPR10aNO2 sensor10aZnO1 aNavale, Shalaka, C.1 aRavi, V.1 aSrinivas, D.1 aMulla, Imtiaz, S.1 aGosavi, S., W.1 aKulkarni, S., K. uhttps://library.ncl.res.in/content/epr-and-drs-evidence-no2-sensing-al-doped-zno-002342nas a2200265 4500008004100000022001400041245006100055210006000116260009200176300001200268490000600280520146300286653001901749653002601768653001901794653000801813100002401821700002601845700002201871700002201893700002001915700002301935700002301958856009501981 2009 eng d a1662-525000aField emission properties of Al-doped ZnO nanostructures0 aField emission properties of Aldoped ZnO nanostructures aLAUBISRUTISTR 24, STAFA-ZUERICH, CH-8712, SWITZERLANDbTRANS TECH PUBLICATIONS LTDcJAN a231-2370 v53 a

Field emission from Al-doped ZnO nanostrcutures has been investigated in planar diode configuration under ultra high vacuum conditions. The Al-doped ZnO nanostructures were synthesized by co-precipitation method with varying aluminium concentrations. The as- synthesized product was characterized by x-ray diffraction, scanning electron microscope and energy dispersive x-ray analysis. The threshold field required to draw a current density of similar to 1 mu A/cm(2) was observed to be similar to 2.0 V/mu m and similar to 2.3 V/mu m for Al-doped ZnO nanostructures synthesized with aluminium concentrations of 1% and 3%, respectively. The Fowler- Nordheim (F-N) plots for both the specimens exhibit non-linear behaviour, which is observed to be specimen dependent. The nonlinearity observed in the F-N plots has been interpreted on the basis of the theory of electron emission from semiconductor emitters. The field enhancement factors, estimated from the slope of the F-N plots, are found to be similar to 9.3 x 10(3) and 3.9 x 10(3) for 1% and 3% Al-doped ZnO emitters, respectively. The high values of the field enhancement factor Suggest that the emission is from the nanostructures. The emission current stability measured at the preset value of similar to 2 mu A over a period of more than three hours is found to be fairly stable. The results indicate use of Al-doped ZnO nanostructures as promising emitters for field emission based devices.

10afield emission10aFowler-Nordheim plots10aNanostructures10aZnO1 aNavale, Shalaka, C.1 aSheini, Farid, Jamali1 aPatil, Sandip, S.1 aMulla, Imtiaz, S.1 aJoag, Dilip, S.1 aMore, Mahendra, A.1 aGosavi, Suresh, W. uhttps://library.ncl.res.in/content/field-emission-properties-al-doped-zno-nanostructures-001740nas a2200229 4500008004100000022001400041245007800055210006900133260006900202300001200271490000800283520096700291653001601258653001901274653001501293653001801308653001401326100002401340700001301364700002201377856011101399 2009 eng d a0925-400500aInvestigations on Ru doped ZnO: strain calculations and gas sensing study0 aInvestigations on Ru doped ZnO strain calculations and gas sensi aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJUN a466-4700 v1393 a

Pure and ruthenium (Ru) doped nano-crystalline zinc oxide (ZnO) powders were synthesized by using well-known citrate gel route. Citric acid acts as a chelating agent and thus helps in the formation of nanoparticles. The detailed X-ray diffraction (XRD) studies using Hall equation reveal that in the nanoscale dimensions, incorporation of Ru modulates the lattice strain. It is interesting to note that on Ru doping, the compressive strain present in the undoped ZnO changes into tensile strain. We have tested the response of these specimens individually for reducing gases like H(2), LPG (liquefied petroleum gas), C(2)H(5)OH (ethanol), CO, acetone and oxidizing gases like NO, and Cl(2). Undoped ZnO responses perceptibly to LPG while Ru doped sample highly senses ethanol vapors. This might be due to either change in composition on Ru doping or/and difference between basicity of LPG and C(2)H(5)OH vapors. (C) 2009 Elsevier B.V. All rights reserved.

10aCitrate gel10aEthanol sensor10aLPG sensor10aNanomaterials10aruthenium1 aNavale, Shalaka, C.1 aRavi, V.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/investigations-ru-doped-zno-strain-calculations-and-gas-sensing-study-001598nas a2200193 4500008004100000022001400041245008400055210006900139260007300208300001400281490000700295520089300302653001201195653001601207653001701223100002401240700002201264856011801286 2009 eng d a0928-493100aPhotoluminescence and gas sensing study of nanostructured pure and Sn doped ZnO0 aPhotoluminescence and gas sensing study of nanostructured pure a aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY a1317-13200 v293 a

The nanostructured pure and Sn doped ZnO have been synthesized by the thermal evaporation technique. The influence of Sri oil the morphology and structure is investigated by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis techniques, The SEM images indicate change in the growth pattern from nanowires of pure ZnO to tetrapods for Sn doped ZnO. Pure ZnO nanowires exhibit selective response towards acetone vapors while on Sri doping the response decreases. The non-stiochiometry and the morphology of ZnO arc probably responsible for such a difference in gas response. However increase in temperature doesn't improve the sensing behavior. The photoluminescence (PL) Studies reveal UV emission in pure ZnO which shifts to green emission oil doping of Sri. All rights reserved. (C) 2008 Elsevier B V. All rights reserved.

10aAcetone10aGas sensors10aSn doped ZnO1 aNavale, Shalaka, C.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/photoluminescence-and-gas-sensing-study-nanostructured-pure-and-sn-doped-zno-002446nas a2200253 4500008004100000022001400041245014300055210006900198260007300267300001000340490000700350520146200357653002701819653002901846653002701875653001801902100002601920700002501946700002401971700002201995700002402017700002102041856013002062 2012 eng d a0927-776500aNanowires of silver-polyaniline nanocomposite synthesized via in situ polymerization and its novel functionality as an antibacterial agent0 aNanowires of silverpolyaniline nanocomposite synthesized via in  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a35-410 v923 a

Silver-polyaniline (Ag-PANI) nanocomposite was synthesized by in situ polymerization method using ammonium persulfate CAPS) as an oxidizing agent in the presence of dodecylbenzene sulfonic acid (DBSA) and silver nitrate (AgNO3). The as synthesized Ag-PANI nanocomposite was characterized by using different analytical techniques such as UV-visible (UV-vis) and Fourier transform Infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), thermo gravimetric analysis (TGA). X-ray diffraction (XRD), and transmission electron microscopy (TEM). UV-visible spectra of the synthesized nanocomposite showed a sharp peak at similar to 420 nm corresponding to the surface plasmon resonance (SPR) of the silver nanoparticles (AgNPs) embedded in the polymer matrix which is overlapped by the polaronic peak of polyaniline appearing at that wavelength. Nanowires of Ag-PANI nanocomposite with diameter 50-70 nm were observed in FE-SEM and TEM. TGA has indicated an enhanced thermal stability of nanocomposite as compared to that of pure polymer. The Ag-PANI nanocomposite has shown an antibacterial activity against model organisms, a gram positive Bacillus subtilis NCIM 6633 in Mueller-Hinton (MH) medium, which is hitherto unattempted. The Ag-PANI nanocomposite with monodispersed AgNPs is considered to have potential applications in sensors, catalysis, batteries and electronic devices. (C) 2011 Elsevier B.V. All rights reserved.

10aantibacterial activity10aConducting poly(aniline)10aIn situ polymerization10aNanocomposite1 aTamboli, Mohaseen, S.1 aKulkarni, Milind, V.1 aPatil, Rajendra, H.1 aGade, Wasudeo, N.1 aNavale, Shalaka, C.1 aKale, Bharat, B. uhttps://library.ncl.res.in/content/nanowires-silver-polyaniline-nanocomposite-synthesized-situ-polymerization-and-its-novel-000663nas a2200157 4500008004100000022001400041245010800055210006900163260006900232300000800301490000800309100002400317700001300341700002200354856012900376 2013 eng d a0925-400500aResponse to the comments on `Investigations on Ru doped ZnO: strain calculations and gas sensing study'0 aResponse to the comments on Investigations on Ru doped ZnO strai aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcSEP a8260 v1861 aNavale, Shalaka, C.1 aRavi, V.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/response-comments-investigations-ru-doped-zno-strain-calculations-and-gas-sensing-study-0