A design of high performance gas sensor array with discrete islands of Au catalyst for increasing of zinc oxide nanowire junctions

Abstract

In this study, an effective design for growth of ZnO nanowires directly on gas sensor chips is introduced. The design utilizes the dendrite islands of Au catalyst deposited between and on the Pt electrodes for the nanowires to grow on instead of a continuous seed layer or Au film. This lead to an increase of the nanowirenanowire junctions in the devices, as well as a reduction of the leak current that would occur through the mentioned alternative seed layer; resulting in a higher sensitivity. The results showed that the developed gas sensors could be used for monitoring of NO 2 at low concentration.

A Self-Temperature-Modulated Quadrilateral Gas Sensor for Gas Identification

“…The former approach is that of changing the surface structure and morphology of the sensing layer like grain size or adding physical barriers like membranes to only allow the target gas to reach the sensing layer [7], [8], [9], [10]. The secondary approach takes routing that the selectivity can be realized with a load of catalysts like noble metal [11], [12], [13] and the construction of composite-like heterojunctions [14], [15]. Above all, except for these two approaches, one more method called temperature modulation is thereby which the sensor's sensitivity to different gases can be improved.…”