Abstract
Biomorphic porous SnO2 was hydrothermally synthesized at 160 °C and post-calcined at 550 °C using sorghum straw as biotemplate. The as-obtained tubular porous SnO2 inherited the hierarchical microstructure of sorghum straw with a specific surface area of 28.6 m2·g−1 and exhibits remarkable gas sensing performance. After surface modified by Pt nanoparticles, biomorphic SnO2 shows excellent low-temperature hydrogen sensing characteristics with a high sensitivity of 18.2 for 200 ppm hydrogen at 50 °C, a short response time of 7 s and excellent selectivity, as a result of the synergism of the unique porous structure of biomorphic SnO2 and the catalytic activity of the loaded Pt nanoparticles.
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