Abstract
Hierarchical heterostructures consisting of W 18O 49 nanowires grown on SnO 2 nanowires have been prepared by sequential thermal evaporation of tin and tungsten under partial oxygen atmosphere. Sensors made using isolated heterostructure nanowires showed superior selectivity for the detection of chlorine in comparison to isolated pure SnO 2 nanowires as well as mat type films prepared using heterostructure nanowires. Improved response compared to mat type films arises due to different sensing mechanisms of chlorine arising from its adsorption or replacement of oxygen. On the other hand better selectivity in comparison to isolated SnO 2 nanowires has been attributed to transfer of electrons across hetero-junction from W 18O 49 to SnO 2 and lower sensitivity of W 18O 49 to H 2S. The results show potential of tailored hierarchical nanoheterostructures for the fabrication of gas sensors.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
