Lattice constant of LB films were controlled by introducing "Spacer Molecul
es" such as pyrrole or fullerene into arachidic acid LB films. The appropri
ate buffer layers which satisfy lattice matching between the different mono
layers were successfully formed. The observation using an atomic force micr
oscope clearly showed tl;at the LB films are highly ordered in the lateral
direction even after introducing spacer molecules. The spatially controlled
LB films were also found to be applied for a novel gas sensor with a molec
ular size recognition.