Room temperature conduction characteristics of Calix [4] acid/amine alternate layer Langmuir-Blodgett films

Abstract

Multilayered Langmuir-Blodgett (LB) films were prepared by transferring alternately six layers of calix [4] acid and five calix [4] amine molecules from the subphase of Millipore water (18 MOmegacm ^-1 ) on aluminised glass substrates. Electrical measurements were made obtained at room temperature on LB films in a sandwich structure with a 50 nm thick thermally evaporated aluminium films. The low voltage value of the conductivity is found to be 13.4times10 ^-12 Sm ^-1 . The electrode-limited Schottky effect is responsible for conduction mechanism at a relatively high field due to dc bias and the barrier potential height is determined to be 1.65 eV for metal/LB film/metal system. The ac conductance shows typical power law dependence with a value of ap0.9 for the exponent