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Calcined powders of pure and doped ZnO have been prepared and characterized by XRD and scanning electron microscopy (SEM). Employing these powders ZnO, Pd-ZnO, Fe-ZnO and Ru-ZnO thick film sensor elements have been prepared and tested for specific sensitivity to ammonia gas in air at room temperature. Among all, Pd-ZnO showed high sensitivity to ammonia in the range 50-90 ppm in air and showed a response...