Growth Analysis of Hierarchical ZnO Nanorod Array with Changed Diameter from the Aspect of Supersaturation Ratio

Abstract

One kind of hierarchical ZnO nanorod array with changed diameter was successfully synthesized using Zn powder as the source through the chemical vapor deposition method. The supersaturation ratio was considered a crucial factor determining the growth behavior of reagent species. The growth process was discussed at length, and a growth model was proposed. Another two expanded experiments were conducted to prove the validity of this growth mechanism. In addition, our proposed growth mechanism just could be used to explain some interesting experimental phenomena in preparation of ZnO nanorod arrays, viz., the obtained nanorods often had changed diameter when Zn powder was adopted as the source, and the synthesized nanorods commonly possessed correspondingly uniform diameter when ZnO and carbon powder was used as source. These growth analyses were helpful in comprehending the microcosmic growth behavior of nanostructure and provided some references in preparation of special 1-D nanostructures with definite as...