Abstract
The connection between heterogeneous catalysis and chemoresistive sensors is emerging more and more clearly, as concerns the well-known case of supported noble metals nanoparticles. On the other hand, it appears that a clear connection has not been set up yet for metal oxide catalysts. In particular, the catalytic properties of several different oxides hold the promise for specifically designed gas sensors in terms of selectivity towards given classes of analytes. In this review, several well-known metal oxide catalysts will be considered by first exposing solidly established catalytic properties that emerge from related literature perusal. On this basis, existing gas-sensing applications will be discussed and related, when possible, with the obtained catalysis results. Then, further potential sensing applications will be proposed based on the affinity of the catalytic pathways and possible sensing pathways. It will appear that dialogue with heterogeneous catalysis may help workers in chemoresistive sensors to design new systems and to gain remarkable insight into the existing sensing properties, in particular by applying the approaches and techniques typical of catalysis. However, several divergence points will appear between metal oxide catalysis and gas-sensing. Nevertheless, it will be pointed out how such divergences just push to a closer exchange between the two fields by using the catalysis knowledge as a toolbox for investigating the sensing mechanisms.
Highlights
It is customary to introduce additives to metal oxide-based chemosensors in order to enhance such features as the response magnitude and selectivity. Such additives are very often constituted by noble metals in various forms [1]; their use finds its physicochemical foundation in heterogeneous catalysis, in the concept of spillover [2,3]
It is not surprising that such a connection exists between heterogeneous catalysis and chemosensors
The concept of metal oxide heterogeneous catalysis will be elaborated as a fruitful crossroad with the chemosensors field. This development will be conducted by reviewing various metal oxide catalytic systems that will be shown to be of potential interest even to chemoresistive sensors
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. It is customary to introduce additives to metal oxide-based chemosensors in order to enhance such features as the response magnitude and selectivity. Such additives are very often constituted by noble metals in various forms [1]; their use finds its physicochemical foundation in heterogeneous catalysis, in the concept of spillover [2,3]. The concept of metal oxide heterogeneous catalysis will be elaborated as a fruitful crossroad with the chemosensors field. This development will be conducted by reviewing various metal oxide catalytic systems that will be shown to be of potential interest even to chemoresistive sensors. Points of divergence between the two research fields will be indicated in order to avoid unjustified analogies and to show how catalysis may help to improve research methodology in oxide chemosensors
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