Hydrothermal route to metastable phase FeVO₄ultrathin nanosheets with exposed {010} facets: synthesis, photocatalysis and gas-sensing

Abstract

In this paper, pure metastable phase iron vanadate (FeVO 4 -II) ultrathin nanosheets (50 nm in thickness) with exposed {010} facets were obtained by a mild hydrothermal process, without the use of any template or organic surfactant. The photocatalytic rate of the FeVO 4 -II {010} facets was measured taking advantage of their unique morphology. Furthermore, the FeVO 4 -II catalyst could be easily separated and reused, simply by applying an external magnetic field. In addition, with their n-type semiconductor structure, FeVO 4 ultrathin nanosheets exhibited gas-sensing for an ethanol trace.

Synthesis of platinum-decorated iron vanadate nanorods with excellent sensing performance toward n-butylamine

“…6b), respectively, which correspond to the characteristics of V 5+ , identical to previous reports (V2p peak positions of V 5+ are at 517 ± 0.1 eV and 525 ± 0.1 eV) [24,25]. [35].…”

“…In addition, from Fig. 6c, it can be observed that the O1s peak of pure FeVO 4 nanorods is located at a binding energy of 530.58 eV, whereas for Pt-decorated FeVO 4 nanorods, the O1s peak is located at a slightly higher binding energy of 530.78 eV, which resulted from the noble metal-oxide support interaction [24,25]. The high resolution O1s XPS profile of the Pt-decorated FeVO 4 nanorods contains several peaks.…”

“…Among them, iron vanadate (FeVO 4 ), an n-type semiconductor (E g = 2.0 eV) with a triclinic structure [23], has been widely studied in terms of its morphological control and applications, including nanoplatelets for gas-sensors [22][23][24], nanosheets for photocatalysis [25], and nanorods for lithium-ion batteries [24,26]. In gas-sensing applications, FeVO 4 nanostructures have previously been employed for the detection of O 2 [24], n-butanol [23], and ethanol [25]. However, to date, very few reports exist on the use of metal vanadate nanosensors for detecting organic amine vapors.…”

“…The environmental monitoring of amine vapors are of particular interest since both aliphatic and aromatic amines can induce toxicological effects to humans even at minimal concenTo date, diverse nanostructures based on transition metal vanadates have been reported, including ␤-AgVO 3 [12,13], ␣-CuV 2 O 6 [14],CuV 3 O 8 [15], Co 2 V 2 O 7 [16], ZnV 3 O 8 [17], Na 1.08 V 3 O 8 [18], MnV 2 O 6 [19], BiVO 4 [20], InVO 4 [21] and FeV 3 O 8 [22]. Among them, iron vanadate (FeVO 4 ), an n-type semiconductor (E g = 2.0 eV) with a triclinic structure [23], has been widely studied in terms of its morphological control and applications, including nanoplatelets for gas-sensors [22][23][24], nanosheets for photocatalysis [25], and nanorods for lithium-ion batteries [24,26]. In gas-sensing applications, FeVO 4 nanostructures have previously been employed for the detection of O 2 [24], n-butanol [23], and ethanol [25].…”

Urchin-like m -LaVO 4 and m -LaVO 4 /Ag microspheres: Synthesis and characterization

“…Great efforts have been paid to synthesize many vanadates (such as InVO 4 , BiVO 4 , CeVO 4 , Ag 3 VO 4 , Ag 2 V 4 O 11 , AgVO 3 , Mg 3 (VO 4 ) 2 , Zn 3 (VO 4 ) 2 , FeVO 4 , and LaVO 4 ) and study their photocatalytic activity [20][21][22][23][24][25][26][27][28][29][30]. However, the low photocatalytic activity of pure vanadates restricts its wide application in the photocatalytic degradation of organic contaminants owing to its poor adsorptive performance and the difficulty of migrating photogenerated electron-hole pairs.…”