Langmuir–Blodgett (LB) films of novel tetrathiafulvalene derivative containing diamino group

A new tetrathiafulvalene (TTF) derivative—5,6-diamino-2-(4,5-bis(decylthio)-1,3-dithio-2-ylidene)benzo[d]-1,3-dithiole (1) with strong amphiphilic character and good reversible redox property has been synthesized. The Langmuir–Blodgett (LB) film of compound 1 was fabricated and its physical properties were characterized by UV–vis spectra, X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM) and surface profiler. The room temperature in-plane dc conductivity of the LB film increases from 10−7 S cm−1 to 10−5 S cm−1 after doped by iodine.