An innovative Ag/Cu-doped polypyrrole hybrid nanocomposite gas sensor for superior ammonia detection at room temperature

IF 5.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Advances Pub Date : 2025-02-17 DOI:10.1039/D4MA01166J

Arunima Verma, Tanuj Kumar and Rahul Singhal

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Abstract

Hybrid nanocomposites combining organic and inorganic materials offer enhanced responses to reducing and oxidizing gases. This study presents a novel polypyrrole (PPy)-based hybrid nanocomposite synthesized with varying concentrations of silver (Ag) and copper (Cu) nanoparticles for efficient ammonia sensing at room temperature. The uniform dispersion of Ag/Cu nanoparticles within the PPy matrix enables a dense, smooth surface that enhances electron transport and boosts conductivity, compatibility, and catalytic activity. Structural and surface analyses using XRD, FESEM, UV-vis, EDS, TGA, and FTIR revealed that the PPy@Ag/Cu hybrid nanocomposite sensor achieved an 86% response to 300 ppm ammonia. Selectivity was confirmed against gases like carbon dioxide, carbon monoxide, ethanol, and hydrogen sulphide. The protonation and deprotonation in the PPy@Ag/Cu heterojunction contribute to the ammonia sensing mechanism, making this nanocomposite a promising material for environmental monitoring applications.

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