Abstract
Supramolecular assemblies between graphene and organic fluorophores have been recognised as excellent fluorimetric sensors for numerous significant analytes. Herein, a highly sensitive sensor is designed for interference-free detection of cadmium ion using 5,10,15,20 tetraphenylporphyrin – rGO non-covalent conjugate. Analyte-induced luminescence turn-on is observed in an attractive response range from micromolar to femtomolar with a limit of detection 3.86 fM experimentally, making the system the most sensitive Cd2+ sensor ever reported. The mechanism involved in the detection strategy is probed in detail. The practical utility of the system, established through successful real sample analysis, is further extended by fabricating highly selective solid-state sensor strips operating even at femtomolar levels.
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