Growth of Dual-Layer Nanorods and Nanowalls Using Al Reaction Layer for Cholesterol Biosensor

In this paper, a single-step chemical bath deposition method was developed for the growth of novel aluminium (Al)-doped zinc oxide nanostructures (NSs) comprising a dual-layer of nanorods/nanowalls. This particular mesoporous structure can accommodate a larger number of ChOx molecules than is possible in a traditional nanorod array. The formation of this dual-layer of NSs depends largely on the content of Al ions and reaction time. A cholesterol biosensor was constructed using these NSs as supporting materials for cholesterol oxidase loading. The device achieved sensitivity of 93.82 μA/mMcm² within a linear-range of 1.3-13 mM.