Evaluation of the performance of sensors based on optical imaging of a chemically sensitive layer |
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Authors: | Corrado Di Natale Marco Santonico Roberto Paolesse Daniel Filippini Arnaldo D’Amico Ingemar Lundström |
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Institution: | 1. Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133, Roma, Italy 2. Department of Chemical Science and Technology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy 3. Division of Applied Physics, Department of Physics, Chemistry and Biology, Link?ping University, 58183, Link?ping, Sweden
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Abstract: | Interest in the use of the optical properties of chemical indicators is growing steadily. Among the optical methods that can
be used to capture changes in sensing layers, those producing images of large-area devices are particularly interesting for
chemical sensor array development. Until now, few studies addressed the characterization of image sensors from the point of
view of their chemical sensor application. In this paper, a method to evaluate such performance is proposed. It is based on
the simultaneous measurement of absorption events in a metalloporphyrin layer with an image sensor and a quartz microbalance
(QMB). Exploiting the well-known behaviour of QMB, comparison of signals enables estimation of the minimum amount of absorbed
molecules that the image sensor can detect. Results indicate that at the single pixel level a standard image sensor (for example
a webcam) can easily detect femtomoles of absorbed molecules. It should therefore be possible to design sensor arrays in which
the pixels of images of large-area sensing layers are regarded as individual chemical sensors providing a ready and simple
method for large sensor array development. |
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