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OSAMA A. FOUAD,GOMAA A. M. ALI,M. A. I. EL-ERIAN,SALAH A. MAKHLOUF 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
Ultra¯ne Co3O4=SiO2 nanocomposites were obtained via sol?gel (SG) method and related routes. The samples were characterized using X-ray di®raction (XRD), transmission electron microscopy (TEM) and N2 adsorption?desorption techniques. The obtained phase, size of crystallites and speci¯c surface area of the composites vary with the Co:SiO2 weight ratio and preparation route. Humidity sensing properties measured by monitoring the DC conductivity for the obtained nanocomposites are reported. Conductivity changes amount to four orders of magnitudes were observed in response to 10?90% relative humidity change in the measuring chamber. Results indicate that humidity sensing properties depend on Co content and speci¯c surface area of the composite.