Enhanced gas sensitivity in TiO2 nanoneedles grown on upright SnO2 nanoplates

In situ growth of upright-standing SnO2 nanoplates connected to horizontally pointed TiO2 nanoneedles to form a new, high surface area hierarchical nanostructure is proposed for the first time and envisaged in ammonia and liquid petroleum gas sensors. The increased surface area due to a hierarchical nanostructure accounts for enhanced gas sensitivity.