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Light-modulated ion binding: towards calibrationless sensors

Radu, Aleksandar and Kavanagh, Andrew and Scarmagnani, Silvia and Byrne, Robert and Alhashimy, Nameer and Slater, Conor and Diamond, Dermot (2009) Light-modulated ion binding: towards calibrationless sensors. In: PITTCON 2009 - 60th Pittsburg Conference on Analytical Chemistry and Applied Spectroscopy, 8-13 March 2009, Chicago, USA.

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Abstract

Emerging technologies create new application fields but few of them require that we completely rethink our approach in preparation and characterization of sensors. The vision of internet scale wireless sensor networks (WSNs) requires the deployment of enormous numbers of sensors. This necessarily means that the cost of each sensor must be brought down significantly if this vision is to be realized. An ideal solution for this problem would be a sensor that does not interact with its environment in any way until there is a need for measurement. Upon the measurement, the sensor’s surface is completely regenerated and returned into the state as before the measurement. This step is critical as it ensures that the measurement did not any effect on the sensor hence no calibration is necessary. In our work, we use compounds that indeed can be switched between the active and passive state using light. Most commonly used compounds are so called spiropyrans (SP) and spirooxazines (SO). Here we show the recent advance in preparation of reversible, light-modulated sensors using surface immobilised SP/SO derivatives. A further attractive property of these materials is that they are inherently self-indicating through striking colour changes that enable the state to be easily determined (active vs. passive), and the presence of a bound guest to be detected. These spectral changes enable a range of self-diagnostic tests to be incorporated that enable binding events to be controlled at the surface interface, and for real binding events to be distinguished from artefacts arsing from changes in light intensity, or photobleaching of the active component. We have identified most notable problems for utilization of these compounds in “calibrationless” sensors such as relatively weak binding constants, photodegradation, and unfavourable kinetics of switching between the active and passive state and we demonstrate our approach in solving these problems.

Item Type:Conference or Workshop Item (Lecture)
Event Type:Conference
Refereed:No
Subjects:Physical Sciences > Thin films
Physical Sciences > Photochemistry
Physical Sciences > Analytical chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Official URL:http://www.pittcon.org/
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, SFI 07/CE/I1147
ID Code:2971
Deposited On:06 Apr 2009 15:44 by Aleksandar Radu. Last Modified 29 Apr 2010 14:23

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