Effects of Precursor Concentration on Hexagonal Structures of ZnO Nanorods Grown by Aqueous Solution Method

2013 ◽  
Vol 770 ◽  
pp. 120-123
Author(s):  
P. Limnonthakul ◽  
C. Chananonnawathorn ◽  
K. Aiempanakit ◽  
J. Kaewkhao ◽  
P. Eiamchai ◽  
...  

The ZnO nanorods were fabricated on top of the seeded gold layer by the aqueous solution method with the solution of zinc nitrate and hexamethylenetetramine (HTMA) at 90°C for 24 hours. The variety of the ZnO nanorods were prepared and investigated based on the precursor concentrations, in a range of 1 to 40 mM. The physical morphologies and crystal structures were characterized by field-emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD), respectively. The results showed that, with the small precursor concentrations, the lateral growth of the nanorods was highly significant when compared to their axial growth. The precursor concentration of 20 mM was best optimized for the preparation of the ZnO nanorod arrays with the hexagonal structures at the highest rod diameter and length. At the higher concentrations, although the nanorod size remained nearly constant, the length was however rapidly decreased. Further analyses also proved that, with the increased precursor concentrations, the number density of the ZnO nanorods was progressively increased along with the more complete hexagonal wurtzite structures.

2012 ◽  
Vol 12 (4) ◽  
pp. 3430-3433 ◽  
Author(s):  
Ju-Hyuck Lee ◽  
Keun Young Lee ◽  
Brijesh Kumar ◽  
Sang-Woo Kim

2013 ◽  
Vol 06 (06) ◽  
pp. 1350058 ◽  
Author(s):  
YUAN MING HUANG ◽  
QING-LAN MA ◽  
BAO-GAI ZHAI

A facile and green method was utilized to synthesize core-shelled Zn / ZnO microspheres by boiling Zn microparticles in water for improving the photocatalytic activity of ZnO . The synthesized Zn / ZnO core-shells were investigated by means of scanning electron microscope, X-ray diffractometer and photoluminescence spectrometer, respectively. The morphology analysis showed that the metallic Zn core was about 6 μm in diameter while the ZnO shell was about 600 nm in thickness. Compared to ZnO nanoparticles, the core-shelled Zn / ZnO microspheres exhibited improved photocatalytic activity in degrading methyl orange in water. Our results suggest that the metal–semiconductor junction formed at the Zn / ZnO interface is responsible for the enhanced photocatalytic activity of ZnO .


2016 ◽  
Vol 675-676 ◽  
pp. 134-137
Author(s):  
Phattharaphong Khamkhom ◽  
Mati Horprathum ◽  
Pitak Eiamchai ◽  
Chanunthorn Chananonnawathorn ◽  
Sukon Kalasung ◽  
...  

In this study, we fabricated the zinc oxide (ZnO) nanorods arrays by hydrothermal technique on indium doped tin oxide (ITO) substrate with different concentration of the precursor with zinc nitrate and hexamethyleneteramine (HMTA) in distilled water. Structure, morphology and optical properties of ZnOnanorods on ITO substrate were characterized by x-ray diffractometer, field-emission scanning electron microscope and spectrophotometer, respectively. The ZnO nanorod arrays showing preferentially oriented in the (001) direction and with a wurtzite structure. The scanning electron microscopy results showed that the hexagonal shape ZnO nanorods. It was found that the diameter, length and density of the ZnO nanorods arrays were strongly influenced by the precursor concentration.


2005 ◽  
Vol 87 (10) ◽  
pp. 101908 ◽  
Author(s):  
H. Q. Le ◽  
S. J. Chua ◽  
Y. W. Koh ◽  
K. P. Loh ◽  
Z. Chen ◽  
...  

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