An improved azo chromophore for optical NO2 sensing
Literature Information
A. Bradford, P. L. Drake, O. Worsfold, I. R. Peterson, D. J. Walton, G. J. Price
In previous studies, the response to NO2 of a number of substituted azobenzenes was characterised for sensitivity and kinetics over a range of temperatures. These studies indicated that the optimal sensor of this sort must be based on a chromophore with a binding energy for the target gas of approximately 70 kJ mol−1. Here, we present data for the best chromophore which has resulted, dispersed in an addition-cure polysiloxane matrix. We characterise the activation energy for the binding of NO2 to the azobenzene sites and report measurements of the response time of thin films from which the diffusion constant of NO2 in the matrix is deduced. We report on the behaviour of the films when operated in the cycled mode. We present quartz-crystal microbalance data allowing absolute calibration of the fractional site occupancy in a related system.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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