Abstract
Herein, we proposed a method for dual detection of Al3+ and norfloxacin (NOR) by Au-doped N-acetyl-L-cysteine capped copper nanoclusters (NAC-Cu@AuNCs) following a tandem process. The non-luminescent NAC-Cu@AuNCs was fabricated via a bottom-up reduction method. Under neutral solutions, Al3+ was detected sensitively and selectively based on AIE mechanism. The sensing achieved satisfactory results, displaying a broad linear range from 0.1 µM to 90 µM and a low LOD of 0.15 µM, which is significantly lower than the World Health Organization criterion (7.41 µM). Subsequently, ratiometric sensing of NOR was further successfully realized by Al3+/NAC-Cu@AuNCs via coordination reaction between NOR and Al3+. A good linear relationship was obtained in the range of 0.02–16 µM, with LOD as low as 38.3 nM. This work shows great potential in constructing MNCs as sensors for multifunctional detection by combinatorial principles.
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