Platinum-functionalized black phosphorus hydrogen sensors

Geonyeop Lee, Sunwoo Jung, Soohwan Jang, Ji Hyun Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Black phosphorus (BP), especially in its two-dimensional (2D) form, is an intriguing material because it exhibits higher chemical sensing ability as compared to other thin-film and 2D materials. However, its implementation into hydrogen sensors has been limited due to its insensitivity toward hydrogen. We functionalized exfoliated BP flakes with Pt nanoparticles to improve their hydrogen sensing efficiency. Pt-functionalized BP sensors with back-gated field-effect transistor configuration exhibited a fast response/decay, excellent reproducibility, and high sensitivities (over 50%) at room temperature. Langmuir isotherm model was employed to analyze the Pt-catalyzed BP sensors. Furthermore, the activation energy of hydrogen adsorption on Pt-decorated BP was evaluated, which is equal to the change in work function resulting from hydrogen adsorption on the Pt(111) surface. These results demonstrate that Pt-catalyzed BP exhibits a great potential for next-generation hydrogen sensors.

Original languageEnglish
Article number242103
JournalApplied Physics Letters
Volume110
Issue number24
DOIs
Publication statusPublished - 2017 Jun 12

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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