Nanostructure characterization and performance evaluation of perovskite sensor composed of multi-elements.

A multi-element perovskite nanoscale film composed of Li(+) cation incorporated into Ca(2+)-doped PbTiO(3) (LCPT) was derived via colloidal chemistry, sol-gel (SG) method followed by heat-treatment. The morphology, chemical composition and structure of the LCPT nanofilms were investigated by advanced instrumentation (microscopy and spectroscopy) techniques. The characterization indicates formation of a tetragonal crystalline ceramic after sintering. The humidity sensing performances of LCPT nanofilms with various formulations were evaluated as a function of lattice distortion. The LCPT sensor doped with Li (0.5-0.1mol%) possessed the distortion of 1.041-1.046 and displayed rapid sensitivity (current changes from 1.5x10(-3) to 5.2A), high linearity (R(2)=0.997) in the whole relative humidity range (phi: 8-93% RH) under low frequency of 100Hz, and excellent long-term stability.