### Highly Selective Iodide-sensing Silicone Ladder Polymer Membranes Containing a Porphyrin and a Quaternary Ammonium SaltHighly Selective Iodide-sensing Silicone Ladder Polymer Membranes Containing a Porphyrin and a Quaternary Ammonium Salt

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 Author Tsujimura, Yutaka ♦ Yamane, Masataka ♦ Wakida, Shin-ichi Source J-STAGE Content type Text Publisher The Japan Society for Analytical Chemistry Language English
 Abstract It has been demonstrated that a glass-like silicone ladder-type polymer permits one to homogeneously incorporate high amounts of ionophores into the covalently-bonded double chain structure. Furthermore, by making use of this feature, we have successfully fabricated an iodide ion-sensitive field-effect transistor based on two kinds of ionophores and silicone ladder polymer matrix. As ionophores, 5,10,15,20-tetraphenyl-21H,23H-porphyrin and dimethyloctadecyl-3-trimethoxylsilylpropylammonium chloride were homogeneously incorporated into the matrix. The ion-sensitive field-effect transistor showed a linear potential response ranging in the $I^{-}$ concentration between 1.0 × $10^{-5}$ and 1.0 × $10^{-1}$ M. The selectivity coefficients for $I^{-}$ towards interferences of $ClO_{4}^{-}$ and $NO_{3}^{-}$ were estimated to be $K^{pot}_{I-,ClO4-}$ ≈ 6.2 × $10^{-4}$ and $K^{pot}_{I-,NO3-}$ ≈ 4.9 × $10^{-4}.$ The matrix has proved to be so stable that the selectivity coefficients have not been altered over six months. ISSN 09106340 Learning Resource Type Article Publisher Date 2001-01-01 e-ISSN 13482246 Journal Analytical Sciences(analsci) Volume Number 17 Issue Number 10 Page Count 4 Starting Page 1175 Ending Page 1178