Ultrafast response and recovery trimethylamine sensor based on α-Fe2O3 snowflake-like hierarchical architectures

Snowflake-like α-Fe2O3 hierarchical architectures have been developed to detect trimethylamine (TMA) gas. The α-Fe2O3 has been synthesized by using a facile solvothermal method and a subsequent annealing process. As-fabricated snowflake-like α-Fe2O3 based sensor exhibits ultrafast response and recov...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-09, Vol.718, p.396-404
Main Authors: Yang, Tianye, Du, Liyong, Zhai, Chengbo, Li, Zhifang, Zhao, Qi, Luo, Yang, Xing, Dejun, Zhang, Mingzhe
Format: Article
Language:English
Subjects:
Adsorption
Annealing
Cation exchanging
Electron transfer
Fast response and recovery
Fe2O3
Gas sensor
Heat conductivity
Heat transfer
Hematite
Hierarchical architectures
Iron oxides
Nanocrystals
Oxygen
Recovery time
Selectivity
Snowflakes
Structural hierarchy
TMA
Trimethylamine
Vacancies
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Summary:Snowflake-like α-Fe2O3 hierarchical architectures have been developed to detect trimethylamine (TMA) gas. The α-Fe2O3 has been synthesized by using a facile solvothermal method and a subsequent annealing process. As-fabricated snowflake-like α-Fe2O3 based sensor exhibits ultrafast response and recovery time (0.9 s/1.5 s), excellent selectivity, high response, and superior repeatability toward TMA gas. XPS, PL and UV indicates that abundant oxygen vacancies exist in the α-Fe2O3 surfaces. Oxygen vacancies provide essential active sites for gas adsorption which enormously improve the ability of electron transfer. The remarkable TMA sensing performance can be attributed to the cooperation of oxygen vacancies providing more active sites, rapid electron exchange between Fe3+ and Fe2+ cations inducing conductivity greatly change, and unique snowflake-like hierarchical structure possessing large contacting area and monocrystalline feature. Such novel snowflake-like α-Fe2O3 hierarchical architectures will be a promising candidate for TMA, fish and sea-food freshness detection. •Snowflake-like Fe2O3 were synthesized by a facile solvothermal process.•The Fe2O3 sensor showed ultrafast response and recovery time to TMA.•The gas sensing mechanism of the Fe2O3 sensor was discussed in detail.•A possible growth mechanism of snowflake-like Fe2O3 structure was proposed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.05.227