Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 49, Pages 27152-27159Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09496
Keywords
porous single crystal; In2O3 beads; TiO2-In2O3 composite nanofibers; Schottky contact; NO2; gas sensor
Funding
- Union Funds of the National Natural Science Foundation of China [U1034003]
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- National Natural Science Foundation of China [51273089]
- Scientific Research Fund of Heilongjiang Provincial Education Department [12521421, RC2012XK018005]
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Porous single crystal In2O3 beads@TiO2-In2O3 composite nanofibers (TINFs) have been prepared via a facile electrospinning method. The beads were formed because of the existence of hemimicelles in pecursor solution. The formation of hemimicelles was attributed to the synergy of tetrabutyl titanate (TBT) and polyvinylpyrrolidone (PVP). Abundant In3+ ions were drawn toward the ketonic oxygen of PVP resulting in In3+ ions aggregation. Compared with pristine In2O3 nanofibers (INFs), the as-prepared TINFs exhibited excellent properties for sensing NO2 gas at room temperature (25 degrees C). The enhanced sensing property was due to much absorbed oxygen and Schottky junctions between the porous single crystal In2O3 beads and the Au electrode of the sensor. The strategy for combining the unique In2O3 beads@TiO2-In2O3 nanofibers structure which possessed superior conductivity and sufficient electrons with the addition of TiO2 offered an innovation to enhance the gas sensing performance.
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