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Impedance (or resistance) variation with relative humidity (RH) of silica-based humidity sensors for different materials: (a) xerogel or aerogel coatings; (b) different doping concentrations, Li+ in porous silica (SBA-15) [111]; (c) Li+ in synthetic porous silica (A-SBA-15) [118]; (d) Fe doped SBA-15 [119].
