Formaldehyde (HCHO) could reduce Ag+to Ag on the surface of gold nanorods (AuNRs) to form Au core-Ag shell nanorods (Au@AgNRs) in AuNRs-Ag+-HCHO system, which caused dielectric function to change. Thus, a responsive, simple, sensitive and selective AuNRs colorimetric sensor for the determination of HCHO has been developed based on the linear relationship between?λLPAB and the concentration of HCHO. The limit of detection (LOD) of this sensor is 6.3×10-10 (g mL?1), which is much lower than that of resonance fluorescence spectrometry, showing its high sensitivity. What’s more, the sensor has been applied to the detection of HCHO in water samples with the results agreeing well with resonance fluorescence spectrometry, showing its great practicality. Furthermore, mechanism for the detection of HCHO was also discussed.
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