Highly Sensitive and Selective Detection of Hydrogen Using Pd-Coated SnO2 Nanorod Arrays for Breath-Analyzer Applications

Hwaebong Jung, Junho Hwang, Yong Sahm Choe, Hyun Sook Lee, Wooyoung Lee

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1 Citation (Scopus)


We report a breath hydrogen analyzer based on Pd-coated SnO2 nanorods (Pd-SnO2 NRs) sensor integrated into a miniaturized gas chromatography (GC) column. The device can measure a wide range of hydrogen (1–100 ppm), within 100 s, using a small volume of human breath (1 mL) without pre-concentration. Especially, the mini-GC integrated with Pd-SnO2 NRs can detect 1 ppm of H2, as a lower detection limit, at a low operating temperature of 152C. Furthermore, when the breath hydrogen analyzer was exposed to a mixture of interfering gases, such as carbon dioxide, nitrogen, methane, and acetone, it was found to be capable of selectively detecting only H2. We found that the Pd-SnO2 NRs were superior to other semiconducting metal oxides that lack selectivity in H2 detection. Our study reveals that the Pd-SnO2 NRs integrated into the mini-GC device can be utilized in breath hydrogen analyzers to rapidly and accurately detect hydrogen due to its high selectivity and sensitivity.

Original languageEnglish
Article number2056
Issue number5
Publication statusPublished - 2022 Mar 1

Bibliographical note

Funding Information:
This research was supported by the Technology Innovation Program (‘20013621’, Center for Super Critical Material Industrial Technology) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea), the Basic Science Research Program (2017M3A9F1052297), and the Priority Research Centers Program (2019R1A6A1A11055660) through the National Research Foundation of Korea (NRF), funded by the Korean Government (Ministry of Science and ICT). H.-S. Lee gratefully acknowledges the support from the Basic Research in Science and Engineering Program of the NRF (2021R1A2C1013690).

Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Information Systems
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering


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