Mechanism and Growth of Flexible ZnO Nanostructure Arrays in a Facile Controlled Way

[摘要] Nanostructure arrays-based flexible devices have revolutionary impacts on the application of traditional semiconductor devices. Here, a one-step method to synthesize flexible ZnO nanostructure arrays on Zn-plated flexible substrate in Zn(NO3)2/NH3·H2Osolution system at 70–90∘Cwas developed. We found out that the decomposition of Zn(OH)2precipitations, formed in lowerNH3·H2Oconcentration, in the bulk solution facilitates the formation of flower-like structure. In higher temperature, 90∘C, ZnO nanoplate arrays were synthesized by the hydrolysis of zinc hydroxide. Highly dense ZnO nanoparticale layer formed by the reaction ofNH3·H2Owith Zn plating layer in the initial self-seed process could improve the vertical alignment of the nanowires arrays. The diameter of ZnO nanowire arrays, from 200 nm to 60 nm, could be effectively controlled by changing the stability of Zn(NH3)42+complex ions by varying the ratio of Zn(NO3)2toNH3·H2Owhich further influence the release rate ofZn2+ions. This is also conformed by different amounts of the Zn vacancy as determined by different UV emissions of the PL spectra in the range of 380–403 nm.

[学科分类] 材料工程