Development of highly sensitive, stable and reliable eco-friendly gas sensors is still an open-ended research domain and thus demands many related materials. Bismuth-based compounds form an important material platform in such developments; however, they are so far not reviewed. This review highlights the detailed gas sensing attributes for a range of gases and humidity for n-type and p-type as well as mixed composite materials and influences of catalytic doping on gas sensing in different bismuth-based composites. The future scope in the development of such gas sensors leading to commercialization is also discussed.

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