Using light-emitting complex Ir(mppy)3 to detect acetone from 0.5 to 100 ppm by vertical-channel gas sensor

Chia Hua Liu, Nguyen Pham Yen Nhi, Yi Ming Sun, Hsin-Fei Meng*, Hsiao Wen Zan, Li Yin Chen, Zheng Hao Huang, Ya Chung Tian, Chao Sung Lai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Acetone and ammonia are the gases in human breath with relatively high concentrations of 1–200 ppm and 0.5–2 ppm respectively. Gas sensors with vertical current channels covered with organic polymer semiconductors have been proved to have high sensitivity and reliability in breath ammonia detection. But the polymers have a large current drift in air and poor sensitivity to acetone. Here, the polymer is replaced by the iridium metal complex tris[2-(p-tolyl)pyridine]iridium(III), (Ir(mppy)3), a common emitter in organic light-emitting diode (OLED). The vertical gas sensor now has good sensitivity to acetone in the important range of 0.5–100 ppm. The current of Ir(mppy)3 sensor has a smaller drift in air during the measurement. In 800 s, the current drift of Ir(mppy)3 device is only 3.2% percent, whereas the drift of PTB7 polymer device is 35% and P3HT polymer device is 29%. The good resolution of 0.5 ppm acetone is related to the stability of the current of Ir(mppy)3 device.

Original languageEnglish
Article number106507
JournalOrganic Electronics
Volume106
DOIs
StatePublished - Jul 2022

Keywords

  • Acetone
  • Breath
  • Gas sensor
  • Iridium complex

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