Solution-processed chloroaluminum phthalocyanine (ClAlPc) ammonia gas sensor with vertical organic porous diodes

Govindsamy Madhaiyan*, An Ting Sun, Hsiao-Wen Zan, Hsin-Fei Meng, Sheng Fu Horng, Li Yin Chen, Hsiao Wen Hung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In this research work, the gas sensing properties of halogenated chloroaluminum phthalo-cyanine (ClAlPc) thin films were studied at room temperature. We fabricated an air-stable ClAlPc gas sensor based on a vertical organic diode (VOD) with a porous top electrode by the solution process method. The surface morphology of the solution-processed ClAlPc thin film was examined by field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). The proposed ClAlPc-based VOD sensor can detect ammonia (NH3 ) gas at the ppb level (100~1000 ppb) at room temperature. Additionally, the ClAlPc sensor was highly selective towards NH3 gas compared to other interfering gases (NO2, ACE, NO, H2 S, and CO). In addition, the device lifetime was tested by storing the device at ambient conditions. The effect of relative humidity (RH) on the ClAlPc NH3 gas sensor was also explored. The aim of this study is to extend these findings on halogenated phthalocyanine-based materials to practical electronic nose applications in the future.

Original languageEnglish
Article number5783
Pages (from-to)1-9
Number of pages9
Issue number17
StatePublished - 1 Sep 2021


  • Ammonia gas sensor
  • E-nose
  • Organic semiconductor
  • Room temperature
  • Vertical organic diode


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