Abstract
Metal oxide-based gas sensors (MOGS) are extensively used in applications ranging from health and safety to energy efficiency and emission control. Many recent studies have shown that incorporating two or more metal oxides to form a heterojunction interface at the nano-scale can have drastic effects on gas sensor performance. While there is a wide range of possibilities in designing multitude of nano-heterostructures, their effect on the observed sensor performance cannot be correlated in a systematic manner. This review presents both the opportunities that exist in designing sensors with improved performances and the challenges associated with the dominant electronic and chemical mechanisms that influence the performance of these materials. The article concludes by highlighting some of the major on-going and future research directions that will be crucial for building simple models of charge transport in the nano-heterostructure that controls the sensing properties.
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