Detecting breath ammonia for non-invasive diagnostic based on low-cost organic diode with vertical nanojunctions

Ming Zhi Dai, Yi Lo Lin, Hong Cheng Lin, Hsiao Wen Zan*, Kai Ting Chang, Hsin Fei Meng, Jiunn Wang Liao, May Jywan Tsai, Henrich Cheng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


We propose a novel solid-state electrical ammonia sensor based on a vertical organic diode with high-density nanopores in the top electrode. The proposed ammonia sensor has a detection limit of 20 ppb, a real-time response, sufficient selectivity, simple structure, high reproducibility, and a low production cost. In addition, we used the proposed sensor to detect the nasal breath of rats directly. After controlling the relative humidity and filtering out the CO 2 , we successfully obtained repeated real-time, reliable responses. This is the first demonstration of a solid-state sensor having reliable responses to the breath ammonia of an animal. The sensing response between normal and acute groups is significantly different (p < 0.05). These results demonstrated that the proposed ammonia sensor can detect liver that undergoes moderate hepatopathy.

Original languageEnglish
Title of host publicationIEEE SENSORS 2012 - Proceedings
StatePublished - 1 Dec 2012
Event11th IEEE SENSORS 2012 Conference - Taipei, Taiwan
Duration: 28 Oct 201231 Oct 2012

Publication series

NameProceedings of IEEE Sensors


Conference11th IEEE SENSORS 2012 Conference


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