Interest in quasi ID nanostructures of semiconducting oxides is exponentially grown in the last years, due to their attracting potential applications in electronic, optical and sensor field. After comparing the characteristics of several MOX nanowires recently published we discussed on the sensing properties of metal oxide nanowires and nanotubes, as conductometric and optical gas sensors, prepared by the authors. Single crystal nanostructures were synthesized with the aim of exploring and studying their capabilities as nanosized sensors in form of multi and single nanowire sensors.