We describe examples for an optical gas sensor (oxygen) and an optical ion sensor (pH), and discuss how the existing need for complete mass transfer in solid-state optical sensors determines the choice of the appropriate polymer. Examples are given for biomedical instrumentation based on mass-fabricated optical sensors for oxygen, carbon dioxide and pH. We also show that specific recognition of ions, particularly of the clinically important alkali ions, is much more difficult in solid-state sensors. We discuss existing schemes for ions and demonstrate that none of them satisfies the need for rapid, pH-independent determination of ions in whole blood at room temperature and without addition of any reagent. The photo-induced electron transfer (PET) effect represents an attractive alternative to the use of fluoro-ionophores, but it is shown that PET — while being extremely useful when studied in solution — not necessarily does not occur in solid-state sensor matrices to the extent it does in fluid solution, a fact that is explained mainly in terms of rotational restriction.
CITATION STYLE
Wolfbeis, O. S., Huber, C., & Werner, T. (1997). Solid State Supramolecular Optical Sensors. In Chemosensors of Ion and Molecule Recognition (pp. 61–74). Springer Netherlands. https://doi.org/10.1007/978-94-011-3973-1_5
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