Adsorption effects of NO2 at ppm level on visible photoluminescence response of SnO2 nanobelts

Faglia, G.; Baratto, C.; Sberveglieri, G.; Zha, M.; Zappettini, A.
January 2005
Applied Physics Letters;1/3/2005, Vol. 86 Issue 1, p011923
Academic Journal
The visible photoluminescence (PL) of tin oxide nanobelts is quenched by nitrogen dioxide at ppm level in a fast (time scale order of seconds) and reversible way. Besides, the response seems highly selective toward humidity and other polluting species, such as CO and NH3. We believe that adsorbed gaseous species that create surface states can quench PL by creating competitive nonradiative paths. A comparison between conductometric and PL response suggests that the two responses are ascribable to different adsorption processes.


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