Journal
MATERIALS LETTERS
Volume 302, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2021.130452
Keywords
In2O3/alpha-Fe2O3 heterostructure; Sensors; Triethylamine; Cubic-like structure; Semiconductors
Funding
- National Natural Science Foundation of China [51402123]
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Cubic-like heterostructures of In2O3/alpha-Fe2O3 assembled with 2D porous nanoplates were prepared by solvothermal method and subsequent calcination process. The introduction of Fe3+ component contributed to the morphological evolution and unique gas-sensing behavior, with large specific surface area, effective heterojunctions, and tunable electron transmission mechanism being key factors.
Cubic-like In2O3/alpha-Fe2O3 heterostructures assembled with 2D porous nanoplates have been prepared by solvothermal method and subsequent calcination process. The introduction of Fe3+ component plays an important role for the morphological evolution of In2O3-based samples with unique crystal nucleation and growth mechanism. Compared with flower-like In2O3 self-assemblies composed of tower-like structural units, In2O3/alpha-Fe2O3 composites can display superior trimethylamine (TEA) gas-sensing behavior. For example, the optimal working temperature is reduced from 250 to 170 degrees C, and the response value of In/Fe-2 materials is 375.43, which is about 6.23 times than that of In2O3 sensors. The enhanced gas-sensing properties are mainly attributed to large specific surface area (234.4 m(2)/g), the effective In2O3/alpha-Fe2O3 heterojunctions, unique surface/interface effects, and tunable electron transmission mechanism.
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