Langmuir-Blodgett films of Phospholipid and ZnO were investigated as a sensing membrane to enhance the sensitivity of an olfactory sensor. The membranes were fabricated by alternate stack of dipalmitoylphophatidic acid (DPPA) and ZnO. Compared with the DPPA LB film, the alternately stacked film system showed higher sensitivity and faster response to gases. The chemical vapors used in this study were methanol, ethanol, and acetone.