| Summary: | A multicolor visual method for the detection of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) was reported based on the iodide-mediated surface etching of gold nanostar (AuNS). First, AuNS was prepared by a seed-mediated method in a HEPES buffer. AuNS shows two different LSPR absorbance bands at 736 nm and 550 nm, respectively. Multicolor was generated by iodide-mediated surface etching of AuNS in the presence of H<sub>2</sub>O<sub>2</sub>. Under the optimized conditions, the absorption peak Δλ had a good linear relationship with the concentration of H<sub>2</sub>O<sub>2</sub> with a linear range from 0.67~66.67 μmol L<sup>−1</sup>, and the detection limit is 0.44 μmol L<sup>−1</sup>. It can be used to detect residual H<sub>2</sub>O<sub>2</sub> in tap water samples. This method offered a promising visual method for point-of-care testing of H<sub>2</sub>O<sub>2</sub>-related biomarkers.
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