Synthesis and humidity sensitivity of conducting polyaniline in SBA‐15

Conducting polyaniline (PANI) was synthesized in mesoporous silica SBA‐15. The investigations of XRD, N2 adsorption–desorption, and IR spectra confirm the existence of polyaniline in the channels of SBA‐15 hosts. The impedance of PANI/SBA‐15 composites was studied at different relative humidity (RH) levels, ranging from 11 to 95% RH. The loadings of PANI as well as the concentration of HCl solution have substantial influence on the impedance values. The variation in impedance value of all PANI/SBA‐15 composites is more obvious than that of bulk PANI samples at the same RH. All these results imply that PANI/SBA‐15 composites may have better humidity‐sensitive properties than those of bulk PANI samples.