Nitrogen Oxide (NO) Gas-Sensing Properties of Bi2MoO6 Nanosheets Synthesized by a Hydrothermal Method

Abstract

Bi 2 MoO 6 nanosheets were synthesized by a hydrothermal method. Morphology and structure of the Bi 2 MoO 6 nanosheets were analyzed by SEM, XRD, N 2 adsorption techniques and XPS. Gassensing properties of the as-prepared Bi 2 MoO 6 sensors were also systematically investigated. The results showed the reaction temperature greatly affected the morphology and structure of as-prepared Bi 2 MoO 6 nanosheets. When the reaction temperature reached 170 ºC, the morphology of the Bi 2 MoO 6 nanosheets tended to regular, and pure Bi 2 MoO 6 nanosheets were obtained. The operating temperature determined the gas-sensing properties of the Bi 2 MoO 6 sensor. At this optimal operating temperature of 300 ºC, the sensitivity of the Bi 2 MoO 6 sensor towards 20 ppm nitrogen oxide (NO) reached a maximum of 3.13. With the increase of the nitrogen oxide (NO) concentration, the sensitivity of the Bi 2 MoO 6 sensor also rapidly increased, and displayed an almost linear relationship between them. Additionally, the Bi 2 MoO 6 sensor demonstrated excellent selectivity with respect to several typical interfering gases.

Enhanced Gas-Sensing Properties for Trimethylamine at Low Temperature Based on MoO3/Bi2Mo3O12 Hollow Microspheres

“…Bismuth molybdate, one of the multicomponent oxides, involving three phases namely α-Bi 2 Mo 3 O 12 , β-Bi 2 Mo 2 O 9 , and γ-Bi 2 MoO 6 , was paid more attention on account of its wide availability and the low cost of its component materials . Many investigations have proved that bismuth molybdate is suitable as a gas-sensing material. ,− Although there is no report on the application of β-Bi 2 Mo 2 O 9 and α-Bi 2 Mo 3 O 12 in the field of gas sensing, α-Bi 2 Mo 3 O 12 possesses a special structure of the three phases, in which the ordered oxygen vacancies disperse in every three Bi sites. The special structure is good for the active lattice oxide ions to migrate rapidly, as well as it enhances the ability of reduction–reoxidation .…”

Bismuth-Based Gas Sensors: A Comprehensive Review

“…Quite interestingly, there are a couple of reports on hydrothermally synthesized Bi 2 MoO 6 and h-BiVO 4 nanostructures for ambient temperature sensing of very low concentrations of NO and C 2 H 5 OH, respectively. 74,75 The results indicate that these materials merit detailed study for gas sensor fabrication.…”

Intracellular NO Delivery by Si-Based Ni Composite Nanoflowers

“…Such nanoflowers can also exhibit excellent responses to NO 2 even at very low concentrations. , A sensor composed of Bi 2 MoO 6 demonstrated good sensitivity toward NO, which rapidly and linearly increased with increasing NO concentration. Moreover, this sensor presented excellent selectivity toward several typical interfering gases at high temperature …”

“…The development of nanotechnology has led to revolutionary achievements in diagnosis, therapy, catalysts, sensors, and electronic devices. − Wrapped nanoparticles (NPs) could be developed into novel structures, such as core–shell, yolk–shell, and hollow materials, with large surface areas absorbing to substrates or storing molecules. − Recent studies have revealed that core–shell nanocomposites show advantageous characteristics like a high theoretical specific surface area ( S BET ), easy size tuning, and excellent formability into various shapes. − Particle size and shape are important factors that determine the applicability of NPs. − Among the various types of core–shell NPs available today, nanoflowers have received wide attention due to their variety of 3D structures and large surface area. , Nanoflower-like core–shell structures could be effectively employed in drug delivery, cell imaging, biosensors, and other biomedical applications because their size and shape can easily be controlled. − , Various metal oxide nanoflowers, such as CuO, TiO 2 , ZnO, NiO, and B i2 MoO 6 , have been actively studied to detect industrially produced volatile organic compounds and toxic gases because of their high selectivity. − NiO nanoflowers present good responses toward NO 2 , which is derived from their flower-like structure, mesoporous pores, and large surface area. Such nanoflowers can also exhibit excellent responses to NO 2 even at very low concentrations. , A sensor composed of Bi 2 MoO 6 demonstrated good sensitivity toward NO, which rapidly and linearly increased with increasing NO concentration.…”