Porous FeVO4 nanorods: synthesis, characterization, and gas-sensing properties toward volatile organic compounds

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

“…2a, the lengths of the prepared FeVO 4 nanorods typically vary from ∼2-3 m, with the diameters ranging from 50 to 100 nm. Notably, these nanorods show the presence of numerous pores, which originates from the dehydration of water (H 2 O) molecules during the conversion of hydrated FeVO 4 precursor (FeVO 4 ·1·1H 2 O) to pure triclinic FeVO 4 at high temperatures, as reported previously in our work [23]. Furthermore, from Fig.…”

“…3a.This figure indicates the presence of clear lattice fringes with d-spacings of 0.297 and 0.253 nm, indexed to the interplanar spacing of (120) and (221) planes of triclinic FeVO 4 , respectively. In comparison, the Pt-decorated FeVO 4 nanorods show the (120) lattice of triclinic FeVO 4 along with additional lattice fringes of Pt with a d-spacing of 0.225 nm, corresponding to the d-spacing of (111) plane of Pt [23]. To confirm the porous nature both pure and the Pt-decorated FeVO 4 nanorods, N 2 adsorption-desorption isotherms and Barrett-Joyce-Halenda (BJH) pore size distribution measurements were carried out.…”

“…The porous FeVO 4 nanorods were prepared according to our previous report with some modifications [23]. Typically, 2 mmol of Fe(NO 3 ) 3 ·9H 2 O was dissolved in 10 mL of distilled water to form a clear orange solution and 2 mmol of NH 4 VO 3 was dissolved into another 10 mL of distilled water at 90 • C to form a transparent yellow solution.…”

“…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].…”

“…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.…”