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 (18MΩ cm-1) on aluminised glass substrates. Electrical measurements were made obtained at room temperature on LB films in a sandwich structure with a 50nm thick thermally evaporated aluminium films. The low voltage value of conductivity is found to be 13.4σ10-12 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 1.65eV for metal/ LB film/metal system. The ac conductance shows typical power law dependence with a value of ≈0.9 for the exponent.