An ultra-sensitive room temperature toluene sensor based on molten-salts modified carbon nitride

Zijing Wang*, Zhanyong Gu, Fen Wang, Angga Hermawan, Shingo Hirata, Yusuke Asakura, Takuya Hasegawa, Jianfeng Zhu, Miki Inada, Shu Yin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, two-dimensional crystalline C3N4 (CCN) was obtained by promoting the self-condensation reaction of dicyandiamide in an air atmosphere via the molten salt method. Studies show that compared with polymer-C3N4 (PCN) ((9.8 m2/g)), CCN has a larger specific surface area (77.1 m2/g)) and better crystallinity. Additionally, the resistance of CCN in the air is 40 MΩ, 1250 times lower than that of polymer-C3N4 (PCN) (∼50000 MΩ). Secondly, when 50 ppm toluene gas analysis flows into the CCN based gas sensor at room temperature, the gas response value is 350. The CCN based gas sensor works for 60 days, or after 25 cycles continuously, the gas response value remains at about 350 (Rg/Ra), which is due to the excellent crystallinity, optimized π conjugate system, and enhanced interlayer van der Waals of CCN. Additionally, the critical effect of crystallinity on the gas sensitivity of carbon nitride is also discussed in detail.

Original languageEnglish
JournalAdvanced Powder Technology
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Carbon nitride
  • Crystallinity
  • Molten-salts method
  • Toluene gas sensor

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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