Metal oxide nano materials have huge scientific and industrial applications and proved to be good as sensing devices. ZnO - TiO2 nano composites were synthesized by sol-gel method and tested as a chemi-resistive gas sensor. ZnO - TiO2 nano composites with different weight percentages were prepared. Anatase structure was confirmed by XRD and surface morphology was confirmed by SEM. Dopant composition was analyzed by EDAX. Increased sensitivity was observed with increase in butane concentration for all samples investigated. Extensive experimentation for gas sensing with changing temperature was performed and optimum operating temperature was found to be 363K.