P-type α-Fe₂O₃ hexagonal nanosheets: Synthesis and aniline-sensing performance

Abstract

The unique α-Fe2O3 hexagonal nanosheets have been successfully prepared through a facile solvothermal method with subsequent calcining process. The as-synthesized α-Fe2O3 sample exhibits p-type conductive performance. The gas sensitivities of the as-fabricated Fe2O3 nanosheets-based sensor are comprehensively studied and show good gas-sensing performance toward aniline. Furthermore, the aniline-sensing mechanism is investigated and the origin of the p-type conductivities is also discussed.

The co-enhanced effect of Zn-doping and Ag-loading on the selectivity of a p-type Fe2O3 toward acetone

“…When Fe 3+ ions are predominant, this means that Fe 2+ is doped into Fe 2 O 3 , which is a typical p-type doping. 49–51 The high-resolution XPS spectrum of Fe 2p of the Fe 2 O 3 sample shows that the iron atoms have two states of Fe 3+ and Fe 2+ , proving that Fe 2+ was doped into Fe 2 O 3 . This theoretically explains the reason why the Fe 2 O 3 sensor prepared in our work exhibit p-type conductive characteristics.…”

Facile synthesis of Fe-based metal–organic frameworks from Fe2O3 nanoparticles and their application for CO2/N2 separation

“…Nevertheless, a substantial difference regarding the oxygen constituents was observed when examining the deconvoluted spectra of O 1s in Fe 2 O 3 and M-100Fe@Fe 2 O 3 #1.80 samples. As shown in Figure 7b , the O 1s spectrum of the Fe 2 O 3 sample exhibits two peaks, that is, a major peak at 530.1 eV standing for Fe–O bonds and a minor peak at 532 eV assigned to oxygen-related vacancies within the framework of Fe 2 O 3 [ 35 ]. In contrast, the O 1s spectrum of the M-100Fe@Fe 2 O 3 #1.80 sample was composed of three peaks, namely, a major peak at 531.6 eV for C=O bonds and two minor peaks, one at 530.1 eV for Fe–O bonds and the other at 533.5 eV for O–H bonds [ 32 , 36 ].…”