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Issue 22, 2011
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An optrode particle geometry to decrease response time

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Abstract

A hollow 3 μm sensing microcapsule containing chromoionophores within a 100 nm organosilica shell is reported. This shows a response to an ion step two orders of magnitude faster than ‘filled’ sensing particles of similar diameter. Incorporation of chromoionophores ETH 5294 and ETH 7061 in the capsule shell is shown with a t90 response <2 s compared with >15 min for filled particles of similar diameters. This ultrafast geometry is also extended to dual ionophore dye incorporation and preliminary exploration of a FRET-based ratiometric method is examined to extend the pH response range, using a single excitation wavelength.

Graphical abstract: An optrode particle geometry to decrease response time

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Publication details

The article was received on 20 Apr 2011, accepted on 26 Jul 2011 and first published on 03 Oct 2011


Article type: Paper
DOI: 10.1039/C1AN15336F
Analyst, 2011,136, 4718-4723

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    An optrode particle geometry to decrease response time

    J. D. Walters and E. A. H. Hall, Analyst, 2011, 136, 4718
    DOI: 10.1039/C1AN15336F

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