Controlled bridge growth of ZnO nanowires on laser-scribed graphene-based devices for NO gas detection

Cheng Ying Chou, Shih Feng Tseng, Tien Li Chang, Chen Ting Tu, Hsieh Cheng Han

Research output: Contribution to journalArticle

Abstract

This research proposed a facile low-cost hydrothermal method to control a bridge growth of ZnO nanowires on laser-scribed graphene-based devices applied for NO gas detection. The picosecond laser processing system was used to scribe graphene/glass substrates and to form V-shaped grooves. During the growing process of ZnO nanowires, the surfactant solution of methanol was added into the growth solution to decrease surface tension of V-shaped grooves. Hence, the grown ZnO nanowires could increase their contact area from both sides of the groove edge. The experimental results showed that the V-shaped grooves of graphene/glass substrates were obtained by using optimal laser processing parameters including the pulse repetition rate of 300 kHz, scanning speed of 100 mm/s, laser fluence of 1.81 J/cm2, and number of scribed passes of 3 times. Then, the ZnO nanowires were grown via the immersed processes of the seed layer solution for 80 min and the growth solution with surfactant solution for 8 h. Consequently, the ZnO nanowires had a lowest electrical resistance of 453 Ω. Moreover, the sensitivities of gas sensors were approximately 14.7%, 21.2%, and 40.2% when the ZnO nanowires were exposed to 50 ppm, 150 ppm, and 300 ppm NO gas, respectively.

Original languageEnglish
Article number145204
JournalApplied Surface Science
Volume508
DOIs
Publication statusPublished - 2020 Apr 1

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Keywords

  • Graphene/glass substrate
  • Hydrothermal method
  • NO gas detection
  • Picosecond laser
  • ZnO nanowire

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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