Abstract
Recently, various ZnO nanostructures, such as nanowires, nanorod, and nanosheet have been investigated in solar cells and bio-sensors. In such applications, a high porosity and large surface area are required to improve the efficiency and activity. Therefore, two kinds of different ZnO nanostructures, nanotubes and nanoflowers were synthesized by an aqueous solution approach. Meanwhile, the performance of these devices depends critically on the adsorption properties of dye on ZnO nanostructures. In the present study, the adsorption properties of cytochrome c were investigated by UV-visible spectra. It was found that the adsorption of cytochrome c were strongly dependent on the crystalline structure and morphology of ZnO, and highly ordered nanotubes and nanoflowers show higher cytochrome c adsorption ability compared to that of nanorod arrays. The possible reason was the unique structure and large surface area of these two nanostructures.
