Fundamental investigation on fluorous nanoemulsion optodes: effect of matrix fluorination on selectivity.

As fundamental investigation on fluorous nanoemulsion (NE) optodes for highly selective perfluorooctanesulfonate (PFOS) sensing, the effect of matrix fluorination on selectivity was investigated. Due to the high hydrophobicity of PFOS itself, it responded in exhaustive mode regardless of the fluorination ratio of the matrix, and the lowest detectable PFOS concentration was on the order of 10 to 10 M. On the other hand, the response of non-fluorous interfering anions was suppressed as the fluorination ratio of the matrix increased.