The Morphological Properties of Heterostructured Fe3O4/ZnO Film by Aqueous Solution Process

Heterostructured Fe
₃
O
₄
/ZnO films were fabricated by an aqueous solution process named the spin-spray method at a low substrate temperature of 95 °C. The surface morphology of the ZnO single layer changed from rod array to dense structure by adding citrate ions in the reaction solution. It indicated high optical transmittance above 85%, and exhibited a low electrical resistivity in the range of
$\sim 10^{\mathrm {-2}}~\Omega \cdot \text {cm}$
after UV irradiation. In case of the Fe
₃
O
₄
single layer, it had magnetite phase and another impurity peak was not observed. Then, Fe
₃
O
₄
layer was deposited successively on the ZnO layer, and the as-fabricated Fe
₃
O
₄
/ZnO film had a preferential orientation along (nnn) plane, while other peaks identified for Fe
₃
O
₄
were also detected. Scanning electron microscopy images of the as-fabricated Fe
₃
O
₄
/ZnO films indicated a cubic shape.