01651nas a2200301 4500008004100000022001400041245005700055210005700112260010500169300001200274490000700286520069500293653002100988653001101009653001801020653002201038100002301060700002201083700002001105700002101125700001901146700001701165700001401182700002301196700001901219700002101238856009001259 2005 eng d a0304-428900aSynthesis and analysis of ZnO and CdSe nanoparticles0 aSynthesis and analysis of ZnO and CdSe nanoparticles aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACADEMY SCIENCEScOCT a615-6200 v653 a

Zinc oxide and cadmium selenide particles in the nanometer size regime have been synthesized using chemical routes. The particles were capped using thioglycerol in case of ZnO and 2-mercaptoethanol in case of CdSe to achieve the stability and avoid the coalescence. Zinc oxide nanoparticles were doped with europium to study their optical properties. A variety of techniques like UV-Vis absorption spectroscopy, X-ray diffraction (XRD), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) were used to carry out structural and spectroscopic characterizations of the nanoparticles.

10achemical capping10aDoping10aNanoparticles10aphotoluminescence1 aAshtaputre, S., S.1 aDeshpande, Aparna1 aMarathe, Sayali1 aWankhede, M., E.1 aChimanpure, J.1 aPasricha, R.1 aUrban, J.1 aHaram, Santosh, K.1 aGosavi, S., W.1 aKulkarni, S., K. uhttp://library.ncl.res.in/content/synthesis-and-analysis-zno-and-cdse-nanoparticles-002576nas a2200265 4500008004100000022001400041245012300055210006900178260007300247300001200320490000800332520157800340653003501918653002101953653002001974653003401994100002702028700002702055700002502082700001802107700001802125700001702143700001902160856013102179 2014 eng d a0169-433200aSurface studies on benzophenone doped PDMS microstructures fabricated using KrF excimer laser direct write lithography0 aSurface studies on benzophenone doped PDMS microstructures fabri aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcSEP a292-3000 v3143 a

his paper discusses microfabrication process for benzophenone doped polydimethylsiloxane (PDMS) using laser lithography. KrF excimer laser of 248 nm with 20 ns pulse width at repetition rate of 1 Hz was used for microfabrication of undoped and benzophenone doped PDMS. The doped-PDMS shows sensitivity below 365 nm, permitting processing under ambient light. The analysis of etch depth revealed that doped PDMS shows self developable sensitivity at lower fluence of similar to 250 mJ/cm(2). The unexposed and exposed surface was studied using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and Scanning electron microscopy (SEM). Spectrocopic analysis indicated increase in C-O, C=O, Si-O-3 and Si-O-4 bonding at the expense of Si-C and Si-O-2 bonds of PDMS. In case of laser exposed doped-PDMS, removal of benzophenone from probe depth of spectroscopy was observed. Whereas the surface morphology of exposed and unexposed doped-PDMS was observed to be same, indicating clean development of PDMS micropattems. The present study indicates that addition of 3.0 wt.% benzophenone in PDMS enhance self development sensitivity of PDMS. The self developable results on doped-PDMS are quite encouraging for its potential use in point of care Lab-On-Chip applications, for fabricating micropattems using direct write laser lithography technology. 

10aDirect write laser lithography10aMicrofabrication10amicropatterning10aPoly(dimethylsiloxane) (PDMS)1 aKant, Madhushree, Bute1 aShinde, Shashikant, D.1 aBodas, Dhananjay, S.1 aPatil, K., R.1 aSathe, V., G.1 aAdhi, K., P.1 aGosavi, S., W. uhttp://library.ncl.res.in/content/surface-studies-benzophenone-doped-pdms-microstructures-fabricated-using-krf-excimer-laser-002278nas a2200217 4500008004100000022001400041245007500055210006900130260006900199300001000268490000800278520153400286653001701820653001901837653002301856653001801879100001801897700001801915700001901933856010801952 2014 eng d a0254-058400aSynthesis and luminescence of graphene-nano calcium sulphide composite0 aSynthesis and luminescence of graphenenano calcium sulphide comp aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcSEP a57-640 v1473 a

Graphene-nanocrystalline calcium sulphide has been synthesized using in-situ reduction of calcium salt and graphene oxide. Graphene oxide was prepared using Hummer's method. Surface morphology and crystal structure of samples were observed by transmission electron microscopy (TEM) and X-Ray diffraction (XRD). Ultra thin graphene and graphene oxide sheets with size ranging between tens to several hundreds of square nanometers are observed in TEM images. The TEM micrographs of G-CaS show that CaS particles are embedded in graphene sheets and the average particle size of CaS particles in the composite is less than 50 nm. The reduction in the intensity of various functional groups in FTIR spectrum also confirms the formation of graphene. The UV-Visible spectra of CaS shows absorption peak at 220 nm with a small shoulder at 250 nm whereas in G-CaS 220 nm absorption peak has reduced intensity and the shoulder at 250 nm has now shifted to 270 nm due to modification in the defect structure of CaS by graphene. CaS and G-CaS shows photoluminescence emission at 470 nm (lambda(exc.) = 375 nm) and 440 nm (lambda(exc.) = 350 nm) respectively, however emission intensity of G-CaS is relatively lower than CaS. Although the emission intensity is found to be lower than CaS, addition of CaS to graphene in G-CaS complex has made graphene luminescent. XPS spectra also indicate reduction of various oxygen containing functional groups in highly reduced graphene oxide and G-CaS. (C) 2014 Elsevier B.V. All rights reserved.

10aLuminescence10aNanostructures10apowder diffraction10aPrecipitation1 aSharma, Geeta1 aPatil, K., R.1 aGosavi, S., W. uhttp://library.ncl.res.in/content/synthesis-and-luminescence-graphene-nano-calcium-sulphide-composite-0