Study of SnO/graphene and SnO/Bamboo charcoal nanocomposites sensors for ethanol sensing

Subject Areas :

roya nayebi ¹ , Abdollah Fallah Shojaei ² , Seyed Mohsen Hosseini-Golgoo ³

1 - M.Sc. student in Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran
2 - Professor in Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran
3 - Assistant Prof. in Department of Electerical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran

Received: 2019-06-21 Accepted : 2020-01-21 Published : 2020-08-22

Keywords: ethanol, Gas sensor, Graphene, Tin (II) oxide, Bamboo charcoal,

Abstract :

In this Research, tin(II) oxide doped with graphene (SnO /graphene) nanocomposite was synthesized by hydrothermal method. Structural characteristics of the nanocomposites were studied using X-ray Diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS) scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR), to confirm possible interactions which may have formed between the nanocomposites. Then, SnO /graphene nanocomposite was used as a sensitive and active layer for preparing a gas sensor for ethanol gas sensing. To optimize the condition and function of the sensor, the sensitivity and response of the nanocomposite at working temperature were investigated and important parameters such as response time, recovery time, and selectivity were determined. At the working temperature also at operating temperature, the sensor showed a sensitivity of about 12 times the concentration of 200 ppm and its response time was significantly lower. In addition, the SnO /graphene sensor had good selectivity over the target gas compared to other gases such as methanol, phenylethyl alcohol, acetone, n-hexane, etc. Due to the properties of bamboo charcoal and specific surface properties and its porosity structure, tin (II) oxide doped with bamboo charcoal (SnO/Bamboo charcoal) nanocomposite synthesis, this sensor was also studied. SnO/Bamboo charcoal nanocomposite showed a significant sensitivity to the low concentration of ethanol at 10 ppm which is better than the sensitivity and detection limit compared to SnO /graphene sensor.

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