title: Pyroelectric and conduction properties of Z-type calix[4] acid Langmuir-Blodgett films.
abstract: Non-centrosymmetric Z-type Langmuir-Blodgett (LB) films were prepared by transferring a calix[4] acid monolayer from a subphase of Millipore water (18 Momegacm(-1)) onto aluminised glass substrates. Electrical measurements were performed at room temperature on LB films with a sandwich structure comprising a 50 nm thick thermally evaporated aluminium film. A pyroelectric figure of merit of 2.23 microC m(-2)K(-1) is reported for this LB system. The low voltage value of conductivity is 1.82 x 10(-12) Sm(-1). The electrode-limited Schottky effect is responsible for the conduction mechanism at a relatively high field due to the dc bias and the barrier potential height is determined to be 1.72 eV. The ac conductance for both samples shows a typical power law dependence with a value of approximately 0.86 for the exponent.
authors.affiliation: University of Balikesir, Faculty of Science Department of Physics, Balikesir 10100, Turkey.
authors.forename: R
authors.initials: R
authors.lastname: Gapan
authors.forename: A K
authors.initials: AK
authors.lastname: Ray
authors.forename: T H
authors.initials: TH
authors.lastname: Richardson
authors.forename: A K
authors.initials: AK
authors.lastname: Hassan
authors.forename: F
authors.initials: F
authors.lastname: Davis
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D015374:Biosensing Techniques; D002021:Buffers; D047250:Calixarenes / Q000737:chemistry; D003460:Crystallization; D004553:Electric Conductivity; D004563:Electrochemistry; D004566:Electrodes; D008422:Materials Testing; D008670:Metals / Q000737:chemistry; D008956:Models, Chemical; D015233:Models, Statistical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D002021:Buffers; D008670:Metals; D047250:Calixarenes; D000535:Aluminum