02295nas a2200253   4500008004100000022001400041245017400055210006900229260007300298300001400371490000800385520135300393653001701746653001101763653001101774653001901785653001501804653000801819100002501827700001801852700002001870700002301890856012801913       2011                        eng d  a0169-433200aSynthesis of Cu-ZnO and C-ZnO nanoneedle arrays on zinc foil by low temperature oxidation route: effect of buffer layers on growth, optical and field emission properties0 aSynthesis of CuZnO and CZnO nanoneedle arrays on zinc foil by lo  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a8366-83720 v2573 a<p>Different densities of ZnO nanoneedle films have been prepared by pre-coated zinc foils with thin layer of copper and carbon followed by thermal oxidation at 400 degrees C in air. The X-ray diffraction patterns show well defined peaks, which could be indexed to the wurtzite hexagonal phase of ZnO. The scanning electron microscope images clearly reveal formation of ZnO needles on the entire substrate surface. The X-ray photoelectron spectroscopy studies indicate that Cu and C ions are incorporated into the ZnO lattice. Photoluminescence studies evaluate different emission bands originated from different defect mechanism. From the field emission studies, the threshold field, required to draw emission current density of similar to 100 mu A/cm(2), is observed to be 2.25 V/mu m and 1.57 V/mu m for annealed zinc foil pre-coated with copper and carbon, respectively. The annealed film with copper layer exhibits good emission current stability at the pre-set value of similar to 100 mu A over a duration of 4 h. The results show that buffer layer is an important factor to control the growth rate, resulting in different density of ZnO needles, which leads to field emission properties. This method may have potential in fabrication of electron sources for high current density applications. (C) 2011 Elsevier B. V. All rights reserved.</p>10aBuffer layer10aCarbon10aCopper10afield emission10aNanoneedle10aZnO1 aJamali-Sheini, Farid1 aPatil, K., R.1 aJoag, Dilip, S.1 aMore, Mahendra, A.  uhttps://library.ncl.res.in/content/synthesis-cu-zno-and-c-zno-nanoneedle-arrays-zinc-foil-low-temperature-oxidation-route-001941nas a2200217   4500008004100000022001400041245005400055210005300109260009900162300001400261490000700275520123500282653001101517653002301528653001401551653000801565100002501573700001901598700001801617856008801635       2012                        eng d  a0272-884200aSurface characterization of Au-ZnO nanowire films0 aSurface characterization of AuZnO nanowire films  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcDEC  a6665-66700 v383 a<p>Au-ZnO nanowire films have been synthesized by annealing Zn foils coated with a thin layer of gold. An X-ray diffraction study found that the synthesized ZnO consists mainly of a hexagonal wurtzite structure along with a small amount of AuZn3 phase. Scanning electron images showed that the ZnO wires extend to several microns in length. X-ray photoelectron spectroscopy studies confirmed the oxidation states of Au and Zn. An asymmetric O ls peak indicates the presence of oxygen in an oxide layer and O H groups on the films surfaces. Photoluminescence (PL) spectra showed different visible peaks for pre-annealed films, while for annealed films an UV peak appeared. In addition, the PL analysis showed that the overall intensity of photoluminescence decreased significantly after the films were annealed. Raman spectroscopy results also indicated that the crystalline quality of the films improved with annealing. This could be attributed to a decrease in oxygen vacancies and/or absorption of O-H groups on the surface of ZnO film. The highly hydrophilic surface with a water contact angle of similar to 155 degrees was obtained after annealing in air. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.</p>10aAu-ZnO10aHighly hydrophilic10aNanowires10aXPS1 aJamali-Sheini, Farid1 aYousefi, Ramin1 aPatil, K., R.  uhttps://library.ncl.res.in/content/surface-characterization-au-zno-nanowire-films-0