Abstract
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 $93.82\mu \text{A}/\text{mMcm}^2$ within a linear-range of 1.3–13 mM.
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