Ambient Carbon Monoxide and Nitric Oxide Sensors Based on Nanosized Metallic Oxides

A.D. Adeyemo, P.K. Dutta
The Ohio State University, US

Keywords: nano materials, gas sensors, hydrated ruthenium oxide, vanadium oxide, carbon monoxide, nitric oxide

Summary:

Over the past few decades, innovation in materials for gas sensing applications have involved change in materials morphology, as in titanium oxide nanorods, addition of nanoparticles, such as Au to cobalt oxide, and the use of conducting polymers such as polyanaline. These studies have included but are not limited to optical and electrochemical sensors. Within the subset of electrochemical gas sensors, metal oxide based devices have been extensively studied for motor vehicle emissions, optimizing combustion processes and, environmental monitoring. Within this research there are still avenues for improvement with issues related to interferences, response times, detection limits and the necessity of high temperature operation. The scientific literature has had few examples of metal oxides that are selective to the detection of gases such as carbon monoxide (CO) and nitric oxide (NO) under ambient conditions. This study examined the interaction of CO and NO on nanoparticles of conducting metal oxides without heating, and shows promise as a new class of resistive based ambient gas sensors. This work is based on particles of hydrated ruthenium oxide and vanadium pentoxide and offers possible applications for adopting them into a sensor in portable low power devices, such as mobile phones.