Sanjeev Kumar et al 2005 Nanotechnology 16 1167 doi:10.1088/0957-4484/16/8/031
Sanjeev Kumar1, Vinay Gupta and K Sreenivas
Show affiliationsThe synthesis of ZnO nano-needles using unbalanced magnetron sputtering is reported. A multilayer structure comprised of ZnO(50 nm)/Zn(20 nm)/ZnO(2 µm) was grown on a stainless steel substrate without substrate heating. The growth of ZnO nano-needles was observed on the surface of the multilayer structure after post-annealing treatment at 300–400 °C. The nano-needles were distributed randomly over the entire surface and had an average diameter of 20 nm; their length varied from 2 to 5 µm. The ultra-thin Zn layer (20 nm) in the multilayer structure is attributed to act as a nucleating centre and it activates the coalescence process for the growth of ZnO nano-needles. The ZnO nano-needles showed enhanced ultraviolet photoresponse with an initial fast rise and decay. The origin of the photoconductivity is due to the bulk related process. Results show the myriad application of ZnO nano-needles in ultraviolet light detection.
81.16.-c Methods of nanofabrication and processing
72.40.+w Photoconduction and photovoltaic effects
81.40.Gh Other heat and thermomechanical treatments
81.07.Bc Nanocrystalline materials
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
Condensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue 8 (August 2005)
Received 11 February 2005, in final form 22 April 2005
Published 17 May 2005
Sanjeev Kumar et al 2005 Nanotechnology 16 1167
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