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S Sasmal, A Sinha, B Donnadieu, RGS Pala, S Sivakumar and S Valiyaveettil
Hybrid organic-inorganic perovskites possess promising signal transduction properties which can be exploited in a variety of sensing applications. Interestingly, the highly polar nature of these materials, while being a bane in terms of stability, can be a boon for sensitivity when they are exposed to polar gases in a controlled atmosphere. However, signal transduction during sensing involves irreversible changes in chemical and physical structure, which is one of the major lacuna preventing its utility in commercial applications. In the context of perovskite materials utilized for sensing, we address major issues such as reversibility of structure and properties, the correlation between instability and structure of the alkylamine, and the relation between packing of alkylammonium chain inside the crystal lattice with the response time towards NH3 gas. The current investigation highlights that volatility of alkylamine formed in presence of NH3 determine the reversibility and stability of original perovskite lattice. In addition, packing of alkylammonium chain inside the perovskite crystal lattice decides the rapid response towards NH3 gas. This mechanistic study addressing three important determining factors such as quick response, reversibility, and high stability, ultimately leads to the design of a stable and sensitive 2D hybrid perovskite towards ammonia sensing.
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Acid, Natural gas, Methylamine, Amino acid, Ammonia, Amide, Nitrogen, Amine
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