An Ionophore-Based Anion-Selective Optode Printed on Cellulose Paper.

An Ionophore-Based Anion-Selective Optode Printed on Cellulose Paper.
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DOI:
10.1002/anie.201706147
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发表时间:
2017-09-18
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Meyerhoff ME
Meyerhoff ME
中科院分区:
其他
文献类型:
--
作者:
Wang X;Zhang Q;Nam C;Hickner M;Mahoney M;Meyerhoff ME

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We report a general anion sensing platform based on a portable and cost-effective ion-selective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anion-selective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjet-printed and adsorbed on paper and form a “dry” hydrophobic sensing layer. Porous cellulose sheets also allow the sensing site to be modified with dried buffer that prevents any sample pH dependence of the observed color change. A highly selective fluoride optode using an Al(III)-porphyrin ionophore is examined as an initial example of this new anion sensing platform for measurements of fluoride levels in drinking water samples. In addition to Lewis acid-base recognition, hydrogen bonding recognition is also shown to be compatible with this sensing platform. Cellulose paper as a sole substrate allows adsorption of a lipophilic anion ionophore and pH-sensitive indicator dye to enable heterogeneous anion sensing via an anion-proton co-extraction mechanism. This platform also enables adsorption of a buffer salt as the sample pH adjuster to prevent pH dependence of the optical anion response. The adsorption takes place on the surface of both crystalline and non-crystalline domains, and the bulk of only loosely packed non-crystalline domains.
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发表时间: 2016-02-05
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影响因子: --
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