High-surface-area tin oxide aerogels have been synthesized by an ambient-pressure drying method, using a non-alkoxide tin precursor and a hybrid sol-gel technique. The tin precursor was dissolved in different volume ratios of mixed water and ethanol solvents, and gelation was attained by means of an epoxide-initiated gelation process. The solvent in the gel was successively replaced with low-surface-tension solvents, and finally the gels were dried at ambient pressure in an oven. It was observed that solvent combinations significantly altered the textural properties of tin oxide aerogels. The solvent exchange process used prior to ambient-pressure drying helped to minimize impurities originating from the tin precursor. The tin oxide aerogels had the maximum specific surface area of 209 m2/g and small crystallite size (<6.5 nm) after an annealing treatment at 500 °C for 2 h. The sensitivity of a SnO2 sensor to CO gas was found to be strongly affected as the specific surface area of its constituent tin oxide aerogel was increased from 121 m2/g to 209 m2/g. This study offers evidence of the effects of tin oxide aerogel's specific surface area upon its gas sensing performance.
|Number of pages||8|
|Journal||Solid State Sciences|
|Publication status||Published - 2015 Dec|
Bibliographical noteFunding Information:
This work was supported by the Business for Cooperative R&D between Industry, Academy, and Research Institutes program, funded by the Korea Small and Medium Business Administration in 2015 (Grant No. C0277323 ). Dinesh B. Mahadik is highly thankful to the Brain Korea office for financial support through a post-doctoral fellowship.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics