Ionic Liquid Assisted Synthesis of α-Fe2O3 Nanospheres Based on Potassium Acetate Solution and Their Gas-sensing Properties†

doi:10.7503/cjcu20170804

Abstract

Abstract:

α-Fe₂O₃ nanospheres with good crystallinity and uniformity, diameter of 10—30 nm were synthesized from FeCl₃·6H₂O and CH₃COOK with 1-butyl-3-methylimidazolium chloride([Bmim]Cl) as ionic liquid structure-based agent and surfactant by hydrothermal method at a constant temperature of 150 ℃ for 8 h. The effects of different amounts of [Bmim]Cl on the formation of iron oxide and its gas sensing properties were investigated. The gas-sensing results show that α-Fe₂O₃ nanospheres exhibit the best gas-sensing properties to ethanol when the amount of ionic liquid is 12 mmol. When the working temperature is 300 ℃, the sensitivity of as-prepared α-Fe₂O₃ nanospheres to 50 μL/L ethanol is 7.56, which is 5.6 times that of α-Fe₂O₃ generated without ionic liquid. There is also a good linear relationship(R=98.8%) in the range of 10—200 μL/L, and the sensor has good selectivity and stability. In addition, the gas-sensing mechanism of α-Fe₂O₃ nanospheres to ethanol, and the influence of operating temperature on its gas-sensing properties were discussed in detail.

Key words: Hydrothermal method, Iron oxide, Ionic liquid, Gas-sensing

CLC Number:

O614.81

TrendMD:

PAN Shuai, HU Xiaobing, SONG Runmin, XIE Lili, ZHU Zhigang, ZHENG Liaoying. Ionic Liquid Assisted Synthesis of α-Fe₂O₃ Nanospheres Based on Potassium Acetate Solution and Their Gas-sensing Properties^†[J]. Chem. J. Chinese Universities, 2018, 39(8): 1631.

Figures/Tables 9

Fig.1 Gas sensor preparation process based on α-Fe2O3 nanospheres and the test system

Fig.2 XRD patterns of α-Fe2O3 nanospheres prepared with different amounts of ionic liquid(A) and FTIR spectra of S-0(a), S-4(b) and [Bmim]Cl(c)(B)(A) a. S-0; b. S-1; c. S-2; d. S-3; e. S-4; f. S-5.

Fig.3 SEM images of α-Fe2O3 nanospheres prepared with different amounts of ionic liquid (A) S-0; (B) S-1; (C) S-2; (D) S-3; (E) S-4; (F) S-5.

Fig.4 N2 adsorption-desorption isotherms and pore size distribution(inset) of samples S-0(A) and S-4(B)

Fig.5 Temperature-dependent gas sensing response(A) and response-recovery curves(B) of different α-Fe2O3 nanospheres to 50 μL/L ethanol gasa. S-0; b. S-1; c. S-2; d. S-3; e. S-4; f. S-5. Inset of (B) shows tres and trec of S-4.

Fig.6 Dynamic response transient(A) and sensitivity-ethanol concentration plot(B) for the gas sensor based on sample S-4 at 300 ℃

Fig.7 Stabiliity test of sample S-4 at operating temperature of 300 ℃ to 10 μL/L ethanol(A) and response sensitivity for sample S-4 to different gases at operating temperature of 300 ℃(B) (B) a. C2H5OH; b. CH3COH3; c. H2S; d. NH3; e. NO; f. Cl2; g. NO2.

Fig.8 Reaction mechanism of α-Fe2O3 nanospheres exposed to ethanol gas

Fig.9 Reaction mechanism of α-Fe2O3 nanospheres exposed to ethanol gas at different operating temperatures

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Ionic Liquid Assisted Synthesis of α-Fe₂O₃ Nanospheres Based on Potassium Acetate Solution and Their Gas-sensing Properties^†

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