Abstract
Too much or too little iodine in the body can affect person's health. Therefore, iodide detection is particularly important. In this work, a novel bimetallic nanoparticle sensor based on colorimetric signal responses was developed for the visual detection of I−. Gold nanoparticles (AuNPs) were prepared by in situ reduction of chloroauric acid using gelatine (Gel) as reducing agent, and further constructed as gold-platinum (Au-Pt) alloy nanoparticle. Au-Pt alloy have unique structure and excellent synergistic effects, which provide higher I− detection sensitivity and stability compared to single-metal nanoparticles. The probe undergoes a redox reaction with I−, which causes the colour to change from buff to rufous, enabling colorimetric detection of I−. The probe is more eye-catching than commonly reported I− detectable colour change based on the aggregation of single metal nanoparticles, and this colour change based on steady-state chemical reactions can remain stable for a long time, which makes it easy to record and detect. The probe showed good linearity over the I− concentration range of 0–1.1 mM with a linear fit coefficient of 0.9943 and a lowest limit of detection (LOD) of 0.29 μM. Moreover, the probe showed very high selectivity for I− and was successfully applied to detection of I− in seawater and tap water. More importantly, the probe remains stable at a temperature of 50 ℃ and a salinity of 12 g/L, broadening its practical application range in a variety of harsh conditions. In summary, the probes have great potential for I− detection and analytical applications.
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