Substrate effect of hydrothermally grown ZnO nanorods and its luminescence properties

We report the hexagonal wurtzite crystalline structure of ZnO nanorod growth by hydrothermal chemical wet synthesis at low temperature (90°C). We have used p-Si (100), n-Si (100), α-quartz (0001), MgO (0001) and ITO (polycrystalline) substrates to understand the growth mechanism of ZnO nanorods with a low pressure environment. X-ray diffraction study confirms the hexagonal structure of the ZnO nanorod. Scanning electron microscopy (SEM) also shows the hexagonal structure along with different size and width of the nanorods. The substrate effect of nanorods has been explained on the basis of adatom kinetics during the growth. We observed that the nanorods were grown from a single nucleation point with 4–5 different branches on the ITO substrate with uniform length and width, whereas MgO substrate shows curled flower architecture across the whole area. The photoluminescence illustrates strong substrate effect. A wide range of UV emission bands along with visible emission has been observed from the ZnO nanorods deposited on different substrates.

[1]  Min Lai,et al.  Templated Electrosynthesis of Zinc Oxide Nanorods , 2006 .

[2]  Z. G. Wang,et al.  One-step growth of ZnO from film to vertically well-aligned nanorods and the morphology-dependent Raman scattering , 2005 .

[3]  Gareth M. Fuge,et al.  Synthesis of Aligned Arrays of Ultrathin ZnO Nanotubes on a Si Wafer Coated with a Thin ZnO Film , 2005 .

[4]  Partha Mitra,et al.  ZnO thin film sensor , 1998 .

[5]  S. Liou,et al.  Tunable growth of ZnO nanorods synthesized in aqueous solutions at low temperatures , 2006 .

[6]  Zhiyong Fan,et al.  Electrical and photoconductive properties of vertical ZnO nanowires in high density arrays , 2006 .

[7]  Haidong Yu,et al.  A general low-temperature route for large-scale fabrication of highly oriented ZnO nanorod/nanotube arrays. , 2005, Journal of the American Chemical Society.

[8]  J. Temmyo,et al.  Au-assisted growth approach for vertically aligned ZnO nanowires on Si substrate , 2006 .

[9]  Robert N. Lamb,et al.  The influence of film crystallinity on the coupling efficiency of ZnO optical modulator waveguides , 1995 .

[10]  Tomoji Kawai,et al.  Self-assembly ZnO nanorods by pulsed laser deposition under argon atmosphere , 2005 .

[11]  Yiping Cui,et al.  Combined whispering gallery mode laser from hexagonal ZnO microcavities , 2009 .

[12]  W. Shen,et al.  Fabrication of hierarchical ZnO architectures and their superhydrophobic surfaces with strong adhesive force. , 2008, Inorganic chemistry.

[13]  E. Kowsari.  Sonochemically assisted synthesis and application of hollow spheres, hollow prism, and coralline-like ZnO nanophotocatalyst , 2011 .

[14]  Sangwoo Lim,et al.  Effect of Seed Layer on the Growth of ZnO Nanorods , 2007 .

[15]  T. Wang,et al.  Ultralow threshold field emission from ZnO nanorod arrays grown on ZnO film at low temperature , 2007 .

[16]  L. Vayssieres.  On the design of advanced metal oxide nanomaterials , 2004 .

[17]  Man Young Sung,et al.  Structural and Optical Properties of ZnO Nanowires Synthesized from Ball-Milled ZnO Powders. , 2002 .

[18]  Zhenkun Wang,et al.  Highly ordered zinc oxide nanotubules synthesized within the anodic aluminum oxide template , 2002 .

[19]  Yan Li,et al.  Fabrication of ZnO nanorods and nanotubes in aqueous solutions , 2005 .

[20]  Anders Hagfeldt,et al.  High Light-to-Energy Conversion Efficiencies for Solar Cells Based on Nanostructured ZnO Electrodes , 1997 .

[21]  C. Schlegel,et al.  Vertical nanowire light-emitting diode , 2004 .

[22]  W. Park,et al.  Electroluminescence in n‐ZnO Nanorod Arrays Vertically Grown on p‐GaN , 2004 .

[23]  Chun-Sing Lee,et al.  Electrical properties of zinc oxide nanowires and intramolecular p–n junctions , 2003 .

[24]  Sten-Eric Lindquist,et al.  Three-dimensional array of highly oriented crystalline ZnO microtubes , 2001 .

[25]  D. Riley,et al.  Mechanism of ZnO nanotube growth by hydrothermal methods on ZnO film-coated Si substrates. , 2006, The journal of physical chemistry. B.

[26]  Clement Yuen,et al.  Random laser action in ZnO nanorod arrays embedded in ZnO epilayers , 2004 .

[27]  Yiying Wu,et al.  Room-Temperature Ultraviolet Nanowire Nanolasers , 2001, Science.

[28]  S. Bhunia,et al.  Strong temperature and substrate effect on ZnO nanorod flower structures in modified chemical vapor condensation growth , 2010 .