Pyroelectric and conduction properties of Z-type calix[4] acid Langmuir-Blodgett films.
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.
Gapan
R
R
University of Balikesir, Faculty of Science Department of Physics, Balikesir 10100, Turkey.
Ray
A K
AK
Richardson
T H
TH
Hassan
A K
AK
Davis
F
F
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
D002021:Buffers; D008670:Metals; D047250:Calixarenes; D000535:Aluminum