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Conductance behaviors of (a) polypyrrole-based MIP/TiO2-NTA sensor for detecting 1 ppm HCHO; (b) TiO2 nanotube array for detecting 50 ppm HCHO; (c) dependence between conductance responses and HCHO concentrations for the polypyrrole-based MIP/TiO2-NTA sensor; and (d) conductance responses after the polypyrrole-based MIP/TiO2-NTA sensor exposed to five cycles of 5 ppm HCHO.
