Abstract
A simple hydrothermal method for the synthesis of Ag0.35V2O5 nanobelts with the assistance of sodium dodecyl sulfate (SDS) is reported in this study. The experimental variables that may affect the nanoparticle structures were investigated. And several advanced techniques, such as TEM, HRTEM, X-ray diffraction (XRD), were used to characterize the morphology and composition of the as-prepared nanobelts. The mechanism of the formation and growth of Ag0.35V2O5 nanobelts was also investigated and discussed. The results show that SDS, as a weak reducing agent, plays a crucial role in the formation of Ag0.35V2O5. According to N2 sorption isothermals, the as-prepared Ag0.35V2O5 nanobelts are found to exhibit relative high surface area. The gas sensing performance of the Ag0.35V2O5 nanobelts towards organic amine was tested. It is found that the nanobelts show superior sensitivity of amine(s) to V2O5 particles, lower detection limit (5 ppm), and higher selectivity of amine versus ammonia at an optimized working temperature of ~260 °C. Moreover, the density functional theory (DFT) simulation was conducted to better understand the sensing mechanism. These findings may be useful in designing promising materials to detect amine gases for medical or food industrial applications.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-1119-5) contains supplementary material, which is available to authorized users.
Highlights
Silver vanadium oxides (SVOs) have attracted increasing attention due to their excellent physicochemical properties and diverse applications in fields of batteries [1], gas sensors [2], surface enhanced Raman spectroscopy (SERS), etc. [3]
Synthesis of Ag0.35V2O5 Nanobelts The composition of the product was investigated by X-ray diffraction (XRD) technique
The composition of the sample can be assigned to Ag0.35V2O5, which is prepared by the assistance of sodium dodecyl sulfate (SDS) at the Ag/V molar ratio of 15:100
Summary
Silver vanadium oxides (SVOs) have attracted increasing attention due to their excellent physicochemical properties and diverse applications in fields of batteries [1], gas sensors [2], surface enhanced Raman spectroscopy (SERS), etc. [3]. Silver vanadium oxides (SVOs) have attracted increasing attention due to their excellent physicochemical properties and diverse applications in fields of batteries [1], gas sensors [2], surface enhanced Raman spectroscopy (SERS), etc. Different phases of SVO (e.g., Ag2V4O11 [4,5,6], AgVO3 [7], and Ag0.33V2O5 [8]) have been obtained, depending on different reaction conditions and material stoichiometry [9]. The type of AgxV2O5 has been extensively studied recently [9,10,11], especially applied as battery cathode materials with enhanced cycle performance [8]. The investigation of sensing property of this material, is little reported. Compared with other types of SVO, Ag2V4O11 and AgVO3 have been largely studied as gas sensing materials recently.
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