Abstract
Methyl mercury is very poisonous, forming from bacteria interacting with mercury in water, soil, or plants, and taken up by humans via the food chain. Therefore, it is important to develop accurate, fast and easy to use biologically-applicable sensors for methyl mercury. Here, we present a novel kind of near infrared light derived biosensor for human serum. It is based on Förster resonance energy transfer on a composite film of In2O3: Yb3+, Er3+ inverse opal photonic crystals and CdTe quantum dots. Using 980 nm laser excitation it minimizes artefacts by autofluorescence, and it features accurate selectivity and a detection sensitivity for down to 13 nM of methyl mercury. This finding opens up a novel fluorescence sensor for methyl mercury detection in biological fields.
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