Construction and enhanced gas sensing performances of CuO-modified α-Fe2O3 hybrid hollow spheres

Hydrothermal synthesis of monodisperse porous cube, cake and spheroid-like α-Fe2O3 particles and their high gas-sensing properties

“…3(c), the O 1s spectrum is asymmetrical with an obvious shoulder and can be Gaussian fitted into three peaks at about 529.9, 531.0 and 532.7 eV, which indicates the existence of three different oxygen species. The binding energy peaks located at 529.9 eV are in good consistent with crystal lattice oxygen (O 2− ) ions [35]. It is also can be seen that there exist two types of chemisorbed oxygen species.…”

“…As we all know, the position of the signal of O 1s of the adsorbed oxygen relies on the charge state of adsorbed oxygen. Peak at about 531.0 eV is attributed to adsorbed O − species on the surface of the ␣-Fe 2 O 3 microparticles, and the high binding energy peaks located at 532.7 eV is attributed to chemisorbed O 2 − species on the surface [35]. Fig.…”

“…No characteristic peaks are observed for other impurities such as ferroferric oxide or ferrous iron oxide, indicating the high purity of the final products. Moreover, there is also no characteristic reflection peaks from Cu species can be detected, which may be due to the low content of Cu species [35]. Compare with the pure ␣-Fe 2 O 3 , the diffraction peaks of the Cu-doped ␣-Fe 2 O 3 are obviously broadened, and the broadening can be reflected by the increase of full-width half maximum (FWHM) of the diffraction peaks, as shown in Table 1.…”

“…Some literatures [35][36][37] show that compare to the pure ␣-Fe 2 O 3 sensor, the doped ␣-Fe 2 O 3 sensor with transition metal ions has a remarkably enhance on gas sensing performance to several volatile organic compounds (VOCs) including methanol, ethanol and acetone.…”

Enhanced H2S sensing characteristics of Au modified Fe2O3 thin films

“…Besides, modification with TiO 2 results in the formation of nanoheterostructures which further resulted in enhanced sensing performance towards VOCs [22]. Zhao [24]. Modification with Au has also been reported to result in improved O 2 sensing [25].…”