Realization of an H2/CO dual-gas sensor using CoPd magnetic structures

Jaw Yeu Liang, Yu Jun Chou, Chiao Wen Yin, Wen Chin Lin, Hong Ji Lin, Po Wen Chen, Yuan Chieh Tseng

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


We demonstrated the application of CoPd magnetic devices in single (H2) and dual (H2 and CO) gas detection by varying the thin-film structure. The anomalous Hall effect provided the read-out signal of the devices. The dual-gas sensor was particularly useful for examining whether methane reformation by steam was completed during H2 production where CO is a byproduct. Through in situ Fourier transform infrared and X-ray absorption spectroscopy, we discovered that H2 detection involved a charge-transfer effect between Co and Pd in addition to a surface-adsorption process, for both multilayer and alloy structures; however, CO detection was solely associated with a surface-adsorption process, which only occurred in the alloy structure. The proposed devices demonstrated performances exceeding those of current commercial models (solid-state based) regarding power consumption (<5 mW) because they were not required to undergo a heating process. An Arduino prototype platform was employed to test the modularization of the device, and adequate feasibility was demonstrated.

Original languageEnglish
Article number182401
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 2018 Oct 29

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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