Abstract
The gold nanobipyramids (Au NBPs) are widely used in the analytical detection of biochemistry due to their unique localized surface plasmon resonance (LSPR) properties. In our developed approach, I− in kelp was detected by etching Au NBPs in the presence of IO3−. Under acidic conditions, IO3− reacted rapidly with I− to form I2, subsequently I2 reacted with I− to form the intermediate I3−. In the presence of CTAB, Au NBPs were etched by I2 derived from I3−, resulting in a decrease in the aspect ratio of Au NBPs, to form a significant blue shift of LSPR longitudinal peak and color variation of colloid which changed from blue-green to magenta and could be employed to quantitatively detect the concentration of I− with the naked eye. A linear relationship can be found between the LSPR peak changes with the I− concentration in a wide range from 4.0 μM to 15.0 μM, and the sensitive limit of detection (LOD) was 0.2 μM for UV–vis spectroscopy and the obvious color changes with a visual LOD was 4.0 μM for the naked eye. Benefiting from the high specificity, the proposed colorimetric detection of I− in kelp samples was achieved, indicating the available potential of the colorimetric detection for the determination of I− in real samples. What's more, this detection procedure was time-saving and could avoid tedious procedures.
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