Effect of core and surface area toward hydrogen gas sensing performance using Pd@ZnO core-shell nanoparticles

Thuy T.D. Nguyen, Dung Van Dao, Dong Seog Kim, Hu Jun Lee, Sang Yeob Oh, In Hwan Lee, Yeon Tae Yu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A versatile hydrogen gas sensor is fabricated using Pd@ZnO core-shell nanoparticles (CSNPs), which were synthesized through a hydrothermal route. Effect of oxidation behavior of Pd core to hydrogen sensing is also investigated for Pd@ZnO CSNPs. Accordingly, Pd@ZnO-2 sensor (core-shell sample was calcined in argon) demonstrates the best performance with respect to Pd@ZnO-1 (core-shell sample was calcined in air) and pure ZnO. It shows a much higher response (R = Ra/Rg = 22) than those of Pd@ZnO-1 (12) and pure ZnO (7) sensors with faster response and recovery times (1.4 and 7.8 min) to 100 ppm hydrogen at 350 °C. In addition, Pd@ZnO-2 sensor owns high selectivity to hydrogen among interfering target gases. Improvement can be attributed to the high content of metallic Pd0 species in CSNPs as calcined in argon. Thereby, a higher Pd metallic content (77%) still remains in Pd@ZnO-2 compared to Pd@ZnO-1 (56%), which in turn modulates the resistance of sensors as exposed to air and target gas, thus enhancing gas sensing activity. High BET surface area of core-shell materials provides plenty of active sites for accelerating the sensing reactions as well.

Original languageEnglish
Pages (from-to)252-259
Number of pages8
JournalJournal of Colloid and Interface Science
Volume587
DOIs
Publication statusPublished - 2021 Apr

Keywords

  • Core-shell
  • Hydrogen sensing
  • Palladium
  • Surface area
  • Zinc oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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