Abstract
A nanocomposite(PPy/F-MWCNTs) were successfully synthesized by the in-situ chemical oxidation polymerization with acid-treated multi-walled carbon nanotubes(F-MWCNTs) and polypyrroles(PPy).The as-prepared composite was characterized by Fourier transformed infrared spectra(FT-IR),UV-Vis diffuse refflec-tion spectroscope(UV-Vis DRS),thermal gravimetric analysis(TGA),X-ray diffraction(XRD),Branauer-Emmett-Teller analysis(BET),field-emission scanning electron microscope(FE-SEM) and transmission electron microscope(TEM).The results reveal that the F-MWCNTs is well coated with about 25-40nm thick polypyrrole,and the surface specific areas of PPy/F-MWCNTs is about three times than that of pure PPy.The sensors fabricated by PPy/F-MWCNTs exhibit higher sensitivity,better response/reproducibility towards NH3 vapor at room tempera-ture than that fabricated by pure PPy or F-MWCNTs.The sensitivity is 1.9 even to 200×10-6 of NH3 and the re-sponse time is 135s.In addition,compared with MWCNTs untreated with acid,the as-prepared PPy/F-MWCNTs also exhibits higher sensitivity than that prepared without acid-treated MWCNTs.
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