New insight into gas sensing performance of nanoneedle-assembled and nanosheet-assembled hierarchical SnO2 structures

• Nanoneedle-assembled and nanosheet-assembled SnO2 were synthesized.
• Nanoneedle-assembled SnO2 show quicker gas response and recovery.
• Nanosheet-assembled SnO2 exhibit higher gas response to ethanol.

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.

In the letter, nanoneedle-assembled SnO2 and nanosheet-assembled-SnO2 were synthesized via a hydrothermal method. And nanoneedle-assembled SnO2 shows quicker gas response and recovery while nanosheet-assembled SnO2 exhibits higher gas response.Figure optionsDownload as PowerPoint slide