A double layer structure sensor (DLS sensor) consisting of a photocrosslink
ed PVCA and a PMMA film was prepared. Advantages of the photocrosslinked PV
CA sensor and the PMMA sensor were reflected in the initial sensor performa
nce of the DLS sensor. The sensing characteristics were affected by the thi
ckness and the degree of crosslinking of the photocrosslinked PVCA layer. T
here was an optimum PVCA film thickness (around 0.1 mu m) for reducing the
effect of both instantaneous and long-term coexistent acetone vapor.