Open Access2D Palladium Sulphate for Visible‐Light‐Driven Optoelectronic Reversible Gas Sensing at Room Temperature
Author(s) -
Alkathiri Turki,
Xu Kai,
Zhang Bao Yue,
Khan Muhammad Waqas,
Jannat Azmira,
Syed Nitu,
Almutairi Ahmed F. M.,
Ha Nam,
Alsaif Manal M. Y. A.,
Pillai Naresha,
Li Zhong,
Daeneke Torben,
Ou Jian Zhen
Publication year - 2022
Publication title -
small science
Language(s) - English
Resource type - Journals
ISSN - 2688-4046
DOI - 10.1002/smsc.202100097
Subject(s) - exfoliation joint , palladium , materials science , noble metal , visible spectrum , optoelectronics , crystal (programming language) , metal , nanosecond , exciton , band gap , absorption (acoustics) , photochemistry , nanotechnology , graphene , optics , chemistry , catalysis , organic chemistry , quantum mechanics , computer science , metallurgy , laser , physics , composite material , programming language
2D metal sulphides (MSs) have attracted enormous amounts of attention in developing high‐performance gas sensors. 2D noble metal sulphides and their derivatives, however, have been less studied due to their predominant nonlayered crystal structures for inefficient exfoliation, despite their surface and peculiar optoelectronic properties. Herein, we successfully synthesize 2D palladium sulphate (PdSO 4 ) from palladium sulphide (PdS) bulk crystals by liquid‐phase exfoliation, in which the presence of oxygen species in the exfoliation solvent plays a key role in the sulphate transformation. Ultrathin 2D PdSO 4 planar nanosheets, with thicknesses of ≈3 nm and submicrometer lateral dimensions, exhibit a broad absorption across the visible spectrum, a narrow bandgap of ≈1.35 eV, and a nanosecond scaled long exciton lifetime, which are all suitable for the visible‐light‐driven optoelectronic gas sensing applications. The 2D PdSO 4 ‐based sensor demonstrates a reversible, selective, and sensitive response toward ppb‐leveled NO 2 gas at blue light irradiation, featuring a response factor of ≈3.28% for 160 ppb NO 2 , a low limit of detection of 1.84 ppb, and a > 3 times response factor enhancement over other gases. Herein, the possibility of realizing 2D ultrathin noble metal sulphide compounds from their nonlayered crystal structures and strong potentials in developing high‐performance chemical sensors is explored.