Abstract
Bi2MoO6 nanosheets were synthesized by a hydrothermal method. Morphology and structure of the Bi2MoO6 nanosheets were analyzed by SEM, XRD, N2 adsorption techniques and XPS. Gas-sensing properties of the as-prepared Bi2MoO6 sensors were also systematically investigated. The results showed the reaction temperature greatly affected the morphology and structure of as-prepared Bi2MoO6 nanosheets. When the reaction temperature reached 170 oC, the morphology of the Bi2MoO6 nanosheets tended to regular, and pure Bi2MoO6 nanosheets were obtained. The operating temperature determined the gas-sensing properties of the Bi2MoO6 sensor. At this optimal operating temperature of 300 oC, the sensitivity of the Bi2MoO6 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 Bi2MoO6 sensor also rapidly increased, and displayed an almost linear relationship between them. Additionally, the Bi2MoO6 sensor demonstrated excellent selectivity with respect to several typical interfering gases.
Highlights
In the last several years, with the increasing concerns about public safety and human health, there are great demands on precise detection and early warning for environmentally hazardous gases such as NO, NO2, N2O, NH3, H2S, SO2, CO, CO2, and CH4.1 Among them, nitrogen oxide (NO) is a typical hazardous gas produced from combustion chemical plants and automobiles, and can cause acid rains, photochemical smog and production of ozone.[2]
We reported the synthesis of Bi2MoO6 nanosheets using a simple hydrothermal method, and investigated the morphologies and gas-sensing properties of Bi2MoO6 nanosheets at different reaction temperatures
As reaction temperature is increased to 200 oC, many extra peaks arising from other phases are detected, indicating impurity phase is introduced in the Bi2MoO6 nanomaterials
Summary
In the last several years, with the increasing concerns about public safety and human health, there are great demands on precise detection and early warning for environmentally hazardous gases such as NO, NO2, N2O, NH3, H2S, SO2, CO, CO2, and CH4.1 Among them, nitrogen oxide (NO) is a typical hazardous gas produced from combustion chemical plants and automobiles, and can cause acid rains, photochemical smog and production of ozone.[2]. WO3, ZnO, Co3O4, and La2O3 have been employed for gassensing applications.[10] compared to these simple binary oxides, multicomponent oxides have greater advantages. They have more freedom to tune the chemical and physical properties of nanomaterials by altering their compositions, which make them more suitable to be adopted as gas sensors.[11] Bi2MoO6 is a typical multicomponent metal oxide with a band gap of approximately 2.66 eV. To the best of our knowledge, there was almost no report concerning Bi2MoO6 nanomaterials applied as gas sensors for nitrogen oxide (NO) detection
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