Abstract
SnO2 hierarchical structures assembled by nanoneedles or nanosheets were synthesized through a hydrothermal method. In order to investigate the influence of morphologies on gas sensing properties, their gas sensing performance were tested. We found that the nanoneedle-assembled hierarchical structures show quicker gas response and recovery, which may be due to the better conductivity and lower potential barrier, while the nanosheets-assembled hierarchical structures exhibit higher gas response because of the larger specific surface area.
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