meso-Tritolylcorrole-Functionalized Single-walled Carbon Nanotube DonorAcceptor Nanocomposites for NO2 Detection

meso-Tritolylcorrole-functionalized single-walled carbon nanotubes (TTC-SWNT) donor-acceptor (D–A) heterojunction nanocomposite film was fabricated on a polycarbonate membrane through filtration and non-covalent functionalization, providing an excellent sensing platform with low-cost, high flexibility and good gas accessibility. The TTC-SWNTs nanocomposite displays a fast and sensitive response to nitrogen dioxide with a limit of detection of 10 ppb (S/N = 3). The sensing response was significantly amplified compared to the unmodified one, which was ascribed to a D–A heterojunction at the interface between electron donor TTC and electron acceptor SWNTs. This study provides a simple route to fabricate low-cost and highly sensitive donor-acceptor nanocomposite-based gas sensors.

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