Plasticizer-free and pH-independent ion-selective optode films based on a solvatochromic dye

Abstract

A layer of a solvatochromic dye, an ionophore, and an ion-exchanger deposited on a Nylon membrane enables highly selective colorimetric and fluorometric ion sensing.

Protamine/heparin optical nanosensors based on solvatochromism

“…16,17 Following this work, membrane and particle type sensors that rely on an ion exchange between the target ion and an optical reporter were developed further. [18][19][20][21][22] Emulsified (nanoparticle-type) optical sensors have been of particular interest as they allow: assay miniaturization (to the cellular scale 23,24 ), integration of automated liquid handling, and significantly reduced equilibrium times. Unfortunately, nanoparticle-based polyion sensors for reliable measurement in blood, plasma and serum have not yet been successful.…”

Digital printing of selective and reversible ion optodes on fabrics: toward smart clothes for epidermal chemical sensing

“…Replacement of the pH-sensitive dye with a pHindependent solvatochromic dye is another possible direction. 20 We believe our method presents a strong step towards fabricating smart garments using optical chemical sensors. In future work, we will explore more sensing chemistries, compare more polymer fabrics, extend the ionic analytes, and initiate on-body tests.…”

Quantification of silver in several samples using a new ionophore polymer membrane as an optical sensor

“…Optodes have numerous benets such as facile construction, good selectivity and sensitivity, and high dynamic concentration range accompanied by a low detection limit. [19][20][21] The detection of silver cations by optical sensors based on colorimetric methods has been discussed. Several optical chemical sensors have utilized colored complexes immobilized in a suitable matrix.…”