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-0