Room-temperature response of MOF-derived Pd@PdO core shell/γ-Fe2O3 microcubes decorated graphitic carbon based ultrasensitive and highly selective H2 gas sensor

K Karuppasamy; Ashutosh Sharma; Dhanasekaran Vikraman; Yoon-A Lee; Periyasamy Sivakumar; Jan G Korvink; Hyun-Seok Kim; Bharat Sharma

doi:10.1016/j.jcis.2023.07.046

Room-temperature response of MOF-derived Pd@PdO core shell/γ-Fe₂O₃ microcubes decorated graphitic carbon based ultrasensitive and highly selective H₂ gas sensor

J Colloid Interface Sci. 2023 Dec 15;652(Pt A):692-704. doi: 10.1016/j.jcis.2023.07.046. Epub 2023 Jul 9.

Authors

K Karuppasamy¹, Ashutosh Sharma², Dhanasekaran Vikraman¹, Yoon-A Lee¹, Periyasamy Sivakumar³, Jan G Korvink⁴, Hyun-Seok Kim⁵, Bharat Sharma⁶

Affiliations

¹ Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea.
² Department of Materials Science and Engineering, Ajou University, Suwon 16499, Gyeonggi-do, Republic of Korea.
³ Department of Chemistry, Dongguk University-Seoul, Seoul 04620, Republic of Korea.
⁴ Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermonn-Von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
⁵ Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea. Electronic address: hyunseokk@dongguk.edu.
⁶ Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermonn-Von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany. Electronic address: bharat.sharma@kit.edu.

PMID: 37453873
DOI: 10.1016/j.jcis.2023.07.046

Abstract

With the current upsurge in hydrogen economies all over the world, an increased demand for improved chemiresistive H₂ sensors that are highly responsive and fast acting when exposed to gases is expected. Owing to safety concerns about explosive and highly flammable H₂ gas, it is important to develop resistive sensors that can detect the leakage of H₂ gas swiftly and selectively. Currently, interest in metal-organic frameworks (MOFs) for gas-sensor applications is increasing due to their open-metal sites, large surface area, and unique surface morphologies. In this research, a highly selective and sensitive H₂-sensor was established based on graphitic carbon (GC) anchored spherical Pd@PdO core-shells over γ-Fe₂O₃ microcube (Pd@PdO/γ-Fe₂O₃@GC which is termed as S3) heterostructure materials. The combined solvothermal followed by controlled calcination-assisted S3 exhibited a specific morphology with the highest surface area of 79.12 m² g^-1, resulting in fast response and recovery times (21 and 29 s, respectively), and excellent sensing performance (ΔR/R₀∼ 96.2 ± 1.5), outstanding long-term stability, and a 100 ppb detection limit when detecting H₂-gas at room temperature (mainly in very humid surroundings). This result proves that adsorption sites provided by S3 can promote surface reactions (adsorption and desorption) for ultrasensitive and selective H₂gas sensors.

Keywords: Hydrogen sensor; MOF; Palladium oxide; Surface area; γ-Fe(2)O(3).