Hopping conduction in Langmuir films

Abstract
The dc conductance of Langmuir films of the Cd salts of fatty acids CH3‐ (CH2)n‐2‐COOH, with various n, has been measured at liquid‐nitrogen temperature. The conductivity decreases exponentially with increasing chain length of the fatty acid molecules. This agrees well with the theoretical prediction for hopping conduction in a multilayer system associated with interface states.