Molecular-assembly nanostructures of 1 : 1 mixed Langmuir-Blodgett films of amphiphilic bis-TTF macrocycle and F-4-TCNQ

摘要

Langmuir-Blodgett (LB) films of 1:1 mixture between an electron donor of amphiphilic bis-tetrathiafulvalene (TTF) macrocycle (1) and an electron acceptor of 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-quinodimethane (F4-TCNQ) were fabricated on substrate surface. Formation of molecular-assembly nanowires was observed on mica surface, whose typical dimension was 3 nm (height) x 50 nm (width) x 1000 nm (length). The one-dimensional nanowires were composed of completely charge-transferred (1(2+))(F-4-TCNQ(-))(2), which coexisted with two-dimensional domains of nanowire bundles of neutral 1(0). Room temperature electrical conductivity of 20-layer LB film for 1: 1 mixed monolayer of 1 and F4-TCNQ was 8.3 x 10(-4) S cm(-1). The film showed a semiconducting temperature dependence with an activation energy of 0.30 eV, which was -0.1 eV larger than that of (1(2+))(F-4-TCNQ(-))(2) LB film. (c) 2005 Elsevier B.V. All rights reserved.