Hierarchically porous PdO-functionalized SnO2 nano-architectures for exclusively selective, sensitive, and fast detection of exhaled hydrogen

Sang Hun Kim, Young Kook Moon, Jong Heun Lee, Yun Chan Kang, Seong Yong Jeong

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Approximately one in 10 people worldwide suffer from irritable bowel syndrome (IBS). Thus, early diagnosis and simple monitoring of chronic diseases will help to improve the patient's quality of life. Herein, we report a chemiresistive-type gas sensor for exhaled hydrogen detection that was fabricated by combining hierarchically porous SnO2 nano-architectures and PdO. The unique structured PdO-functionalized SnO2 hydrogen sensor exhibited excellent selectivity (response ratio > 5.2), high response (resistance ratio = 6.3), extremely fast sensing kinetics (response speed: 4.0 s and recovery period: 36.2 s), and low detection limit (0.096 ppm) under high humidity (relative humidity 80%). These exceptional sensing properties toward hydrogen were investigated from multiple perspectives, including effective gas diffusion through multimodal pores, changes in charge-carrier concentration in p-n heterojunctions, and the catalytic effect of PdO. The proposed sensor has a high potential for practical high-performance hydrogen sensor applications and will offer new possibilities for a simple disease diagnosis based on breath analysis.

Original languageEnglish
Pages (from-to)1159-1169
Number of pages11
JournalJournal of Materials Chemistry A
Volume11
Issue number3
DOIs
Publication statusPublished - 2022 Dec 7

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (MSIT) (No. 2021M3H4A3A02086430 and No. 2021R1C1C2009461).

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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