This paper examines the growth of ZnO structures on Si (1 0 0) using the aqueous chemical growth (ACG) technique for deposition times of between 1 and 40 h. It is found that ZnO grown using zinc nitrate hexahydrate (Zn(NO3)(2). 6H(2)O) and hexamethylenetetramine (HMTA) as precursors at 95 degrees C exhibits single-phase wurtzite ZnO crystal structure. The shape and the dimensions of the structures were found to depend on the growth time. The results are discussed in terms of kinetic studies carried out in correlation with the different deposition periods. (C) 2007 Elsevier B.V. All rights reserved.