High Conducting Multilayer Films From Poly(acrylic acid) and Graphite by Layer-by-Layer Self-Assembly

摘要

Exfoliated graphite nanoplateiets were modified by hexadecyltrimethylammonium bromide (C_(16)TAB) and were used for the construction of [poly(acrylic acid)/ graphite]_n [(PAA/G)_n] multilayer films using a layer-by-layer (LBL) self-assembly method. The film thickness was monitored using X-ray diffraction technique; the results showed that the thickness depended on pH of PAA. Under a lower pH value such as 1.5, the average bilayer thickness was 1.5 nm. Once the pH of PAA was increased to 6.5, the bilayer thickness was around 30 nm. The C_(16)TAB modified (PAA/G)_n multilayer films showed high thermal stability and electrical conductivity. A percolation phenomenon occurred at bilayer number of 11, and the mechanism was discussed.