Formaldehyde Sensing Properties of SnO-Graphene Composites Prepared via Hydrothermal Method

doi:10.1016/j.jmst.2015.05.001

Abstract

Abstract: Graphene (G) was prepared by reducing graphene oxide (GO) with hydrazine hydrate. SnO-graphene composites with different amounts of graphene were prepared via hydrothermal method. SnO-G composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of the graphene content in the composites and the hydrothermal temperature on the gas-sensing responses of the materials to formaldehyde vapor were investigated. The gas-sensing selectivity of the sensor based on SnO-1% G (100 °C, 10 h) composite to five kinds of gases (1000 × 10^-6) was also studied. The results revealed that the sensor based on SnO-1% G (100 °C, 10 h) exhibited high response to formaldehyde vapor when the operating temperature of the sensor was 133 °C and the response to 0.001 × 10^-6 formaldehyde attained 3.9. The response time and recovery time for 0.001 × 10^-6 formaldehyde were 24 and 12 s, respectively.

Key words: Graphene (G), SnO, Gas sensor, Formaldehyde

Xiangfeng Chu, Xiaohua Zhu, Yongping Dong, Wangbing Zhang, Linshan Bai. Formaldehyde Sensing Properties of SnO-Graphene Composites Prepared via Hydrothermal Method[J]. J. Mater. Sci. Technol., 2015, 31(9): 913-917.

Figures/Tables 8

XRD patterns of SnO-1% G composites prepared at different hydrothermal reaction temperatures for 10 h.

XRD patterns of SnO-G composites with different graphene content prepared at hydrothermal reaction temperature of 100 °

C for 10 h.

SEM images of the SnO-1% G prepared at 80 °

C (a), 100 °

C (b), and 120 °

C (c) for 10 h.

Responses of SnO-G composites with different graphene/SnO mass ratios to 1000 ×

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