ZnO Nanowire-Based CO Sensors Prepared at Various Temperatures

Abstract

ZnO nanowire-based CO gas sensors were fabricated by growing single crystal ZnO nanowires on patterned templates at various temperatures. It was found that the average length of the nanowires increased while the average diameter of the nanowires decreased as we increased the growth temperature from . It was also found that the nanowires became significantly shorter as the growth temperature was increased. By measuring the resistivity change of the samples at , it was found that the sensor responses were of 3, 17, 57, 7.5, and 5% for the ZnO nanowires grown at 600, 650, 700, 750, and , respectively. Furthermore, it was found that the sensitivity of the sensor was relatively increased when the concentration of injected CO gas increased.