Rapid and stable hydrogen detection based on Pd-modified WO₃ nanosheets

Abstract

Materials with accurate and durable gas detection is essential for gas sensors. We developed a facile and effective method to deposit Pd onto WO3 nanosheets and used the samples for...

PtPd NPs-functionalized metal–organic framework-derived α-Fe2O3 porous spindles for efficient low-temperature detection of triethylamine

“…As shown in Fig. 10, when α-Fe 2 O 3 is in contact with the noble metal Pd NPs, electrons will flow from α-Fe 2 O 3 to Pd until the Fermi energy level reaches the same level, forming a Schottky barrier and expanding the electron depletion layer, 12,32,59 so that the resistance of S2 in air is greater than that of S1. In a triethylamine environment, electrons reacting at the surface of the Pd/Fe 2 O 3 interface are more easily released into the conduction band, enhancing the charge transfer of electrons.…”

“…Metal oxide semiconductors (MOSs) have been extensively studied in detecting flammable, explosive and toxic gases, such as ZnO, 7 Co 3 O 4 , 8 NiO, 9 α-Fe 2 O 3 , 10,11 WO 3 , 12 etc. Among these, α-Fe 2 O 3 , as a typical n-type semiconductor material with a room temperature band gap of 2.2 eV, is gradually becoming a research hotspot for gas-sensitive materials due to its low cost, 13,14 high thermal/chemical stability, and non-toxicity, and has been reported in detecting gases that include ethanol, 9 ethyl acetate, 13 acetone, 15,16 trimethylamine, 17,18 triethylamine 19,20 and n-butanol.…”