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Paper   IPM / Nano-Sciences / 15960
School of Nano Science
  Title:   A graphene/TiS3 heterojunction for resistive sensing of polar vapors at room temperature
1.  Nassim Rafiefard
2.  Azam Iraji zad
3.  Ali Esfandiar
4.  Pezhman Sasanpour
5.  Somayeh Fardindoost
6.  Yichao Zou
7.  Sarah Haigh
8.  Seyed Hossein Hosseini Shokouh
  Status:   Published
  Journal: Microchim. Acta
  Vol.:  187
  Year:  2020
  Pages:   117
  Publisher(s):   Springer-Verlag GmbH
  Supported by:  IPM
The room temperature polar vapor sensing behavior of a graphene-TiS3 heterojunction material and TiS3 nanoribbons is described. The nanoribbons were synthesized via chemical vapor transport (CVT) and their structure was investigated by scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, Raman and Fourier transform infrared spectroscopies. The gas sensing performance was assessed by following the changes in their resistivities. Sensing devices were fabricated with gold contacts and with lithographically patterned graphene (Gr) electrodes in a heterojunction Gr-TiS3-Gr. The gold contacted TiS3 device has a rather linear I-V behavior while the Gr-TiS3-Gr heterojunction forms a contact with a higher Schottky barrier (250 meV). The I-V responses of the sensors were recorded at room temperature at a relative humidity of 55percent and for different ethanol vapor concentrations (varying from 2 to 20 ppm). The plots indicate an increase in the resistance of Gr-TiS3-Gr due to adsorption of water and ethanol with a relatively high sensing response ( 495percent at 2 ppm). The results reveal that stable responses to 2 ppm concentrations of ethanol are achieved at room temperature. The response and recovery times are around 8 s and 72 s, respectively. Weaker responses are obtained for methanol and acetone.

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