Acetone Sensing Characteristics of γ-Fe2O3 Nanofibers†

doi:10.7503/cjcu20140457

Abstract

Abstract:

PVP/FeC₆H₅O₇ composite nanofibers were prepared via electrospinning method. After 3 h of calcinations, the composite PVP/FeC₆H₅O₇ nanofibers were turned to γ-Fe₂O₃ nanofibers. X-ray diffraction(XRD), scanning electron microscopy(SEM) and the Brunauer-Emmett-Teller(BET) method were employed to characterize the products. Before calcinations, the composite nanofibers had smooth and uniform surfaces with an average diameter about 1000 nm. After calcinations, the nanofibers shrank but maintained the continuous structures with an average diameter about 600 nm. When used to detect acetone, sensor based on γ-Fe₂O₃ nanofibers exhibited high response, good linear dependence(7.88×10²—1.58×10⁵ mg/m³), fast response and recovery speed at 230 ℃. The sensor also showed good stability. These properties make the γ-Fe₂O₃ nanofibers good candidates for acetone detection.

Key words: Electrospinning, γ-Fe2O3, Nanofiber, Acetone, Gas sensor(Ed.: F, K, M)

CLC Number:

O611

TrendMD:

YANG Min, LIU Xiaoyang, ZHAO Xudong, LI Benxian, WANG Xiaofeng*. Acetone Sensing Characteristics of γ-Fe₂O₃ Nanofibers^†[J]. Chem. J. Chinese Universities, 2014, 35(8): 1615.

Figures/Tables 9

Fig.1 Schematic image of ceramic tube

Fig.2 XRD pattern of γ-Fe2O3 nanofibers

Fig.3 SEM images of PVP/FeC6H5O7 composite nanofibers(A) and γ-Fe2O3 nanofibers after calcinations(B) Insets are the magnified SEM images of the samples.

Fig.4 N2 adsorption-desorption isotherms(A) and pore size distribution(B) of γ-Fe2O3 nanofibers

Fig.5 Gas response to 7.88×104 mg/m3 acetone vs. operating temperature of the γ-Fe2O3 sensor

Fig.6 Gas response of the γ-Fe2O3 sensors vs. concentration of acetone Inset shows the calibration curve in an acetone concentration range of 7.88×102—1.58×105 mg/m3.

Fig.7 Response and recovery characteristics of the γ-Fe2O3 sensor at 230 ℃ to 7.88×104 mg/m3 acetone

Table 1 γ-Fe2O3 nanomaterials prepared by different methods and the acetone sensing properties

Material	Prepare method	S, R_a/R_g	Response time/s	Recovery time/s	Work temperature/℃	Reference
γ-Fe₂O₃ nanopowder	Solvent method	≈27(7.88×10⁵ mg/m³)	20	100	240	[5]
γ-Fe₂O₃film	Screen printing method	≈2(7.88×10⁴ mg/m³)			330	[23]
γ-Fe₂O₃ nanopowder	Solid phase reaction	≈5(7.88×10⁵ mg/m³)			335	[24]
γ-Fe₂O₃ nanofiber	Electrospinning method	6.9(7.88×10⁴ mg/m³)	24	38	230	This work
γ-Fe₂O₃ nanofiber	Electrospinning method	58.5(7.88×10⁵ mg/m³)	25	41	230	This work

Fig.8 Long-time stability curves of the γ-Fe2O3 sensor

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Acetone Sensing Characteristics of γ-Fe₂O₃ Nanofibers^†

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