Synthesis of Al-doped ZnO Nanorods via Microemulsion Method and Their Application as a CO Gas Sensor

doi:10.1016/j.jmst.2014.12.004

Abstract

Abstract: Aluminum doped ZnO (AZO) nanorods were synthesized by microemulsion method with different types of surfactants. The phase and the morphology of the above nanorods were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). SEM observations showed that the ZnO nanorods had diameters around about 50-200 nm and lengths up to several micrometers. The CO gas sensing properties of the AZO nanorods were tested at operating temperatures of 200, 300, 350 and 400 °C. It was found that AZO nanorods based sensor exhibited the highest sensitivity to CO at 350 °C.

Key words: Zinc oxide, Nanorod, Microemulsion, Aluminum, CO and gas sensor

Sang Kyoo Lim, Seong Hui Hong, Sung-Ho Hwang, Won Mi Choi, Soonhyun Kim, Hyunwoong Park, Min Gi Jeong. Synthesis of Al-doped ZnO Nanorods via Microemulsion Method and Their Application as a CO Gas Sensor[J]. J. Mater. Sci. Technol., 2015, 31(6): 639-644.

Figures/Tables 8

Schematic (a) and top (b) views of sensor.

Chemical structure of surfactants: (a) sodium ethyl benzene sulfonate (EBS), (b) sodium dodecyl benzene sulfonate (DBS).

XRD patterns of synthesized ZnO nanorods and aluminum doped ZnO nanorods with different surfactants: (a) ZnO-EBS, (b) ZnO-DBS, (c) AZO-EBS, (d) AZO-DBS.

FE-SEM images of synthesized ZnO nanorods and aluminum doped ZnO nanorods with different surfactants: (a) ZnO-EBS, (b) ZnO-DBS, (c) AZO-EBS, (d) AZO-DBS.

EDX spectra and element mappings of synthesized ZnO nanorods and aluminum doped ZnO nanorods with different surfactants: (a) ZnO-EBS, (b) ZnO-DBS, (c) AZO-EBS, (d) AZO-DBS.

XPS analysis of synthesized ZnO nanorods and aluminum doped ZnO nanorods with different surfactants: (a) Zn 2p, (b) O 1s, (c) Al 2p.

Response of ZnO nanorods and aluminum doped ZnO nanorods to 100 ×

10-6 of CO in air depending on working temperature: (a) ZnO-EBS, (b) ZnO-DBS, (c) AZO-EBS, (d) AZO-DBS.

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