Assembling SnO2 nanocubes to nanospheres for high-sensitivity sensors

作者：Yu, L.; Zhang, M.; Chen, Y. J.; Zhang, H. M.; Li, Q. H.^*; Zhang, E. D.; Xu, Z.

来源：Solid State Sciences, 2012, 14(4): 522-527.

DOI：10.1016/j.solidstatesciences.2012.02.003

• Nanocubes
• SnO2 nanospheres
• High-sensitivity

SnO2 nanospheres with a diameter of about 150 nm were synthesized by a hydrotherrnal method. They were assembled by numerous tetragonal nanocubes with an average size of 8 nm. Since the morphology of nanospheres agglomerated by nanocubes, the modulations of quantum confinement and large contact area were realized; this would serve as the basis for high sensitivity. The sensors based on the as-synthesized nanospheres showed good selectivity among different gases and superior sensitivity to ethanol compare with previous reports. The sensitivity could reach 53 to 50 ppm ethanol at a relatively low working temperature of 275 degrees C. A possible mechanism was proposed, which could be primarily related to the large surface-to-volume ratio and the small size effect of nanocubes. Published by Elsevier Masson SAS.

• 出版日期2012-4
• 单位湖南大学; 化学生物传感与计量学国家重点实验室