Cheng Yu Xu,Shu Yi Ma,Tian Yuan Dong,Ji Ming Liu,Jin Sha Wei,Hong Tao Jiang,Ping Ni,Ge Ge Fan,Jia Yun Guo
Triethylamine (TEA) is typical hazardous volatile organic gas (VOCs), it is particularly important for us to effectively detect triethylamine in complex places. In this work, high efficiency triethylamine gas sensor based on SmVO 4 was successfully obtained by means of hydrothermal reaction and assisted calcination. Characterization of analytical materials, SmVO 4 octahedral nanoparticles formed clusters similar to pomegranate fruits. There is a trace +4 valence state of vanadium in the material, which contributes to the oxidation-reduction reaction between the target gas and the surface of the material. Gas sensitive test results found that the SmVO 4 sensor still has a 2.45 response to the target gas (triethylamine) at low concentrations (1 ppm). SmVO 4 shows excellent selectivity for triethylamine, with a response value more than three times that of other gases. In 25 days, it shows excellent stability and fast response recovery time (15 s/40 s). In addition, the gas sensing mechanism is analyzed.
Xianjin Ge,Youjin Zhang,Hai Wu,Maozhong Zhou,Tao Lin
Dodecahedral SmVO 4 nanocrystals with uniform size had been successfully synthesized by a facile hydrothermal process in the presence of potassium hydroxide and urea. The dodecahedron-like SmVO 4 was characterized by X-ray diffraction, field-emission scanning electron microscopy, Fourier transform infrared, X-Ray photoelectron spectroscopy, high-resolution transmission electron microscopy and photoluminescence. The possible growth mechanism of the SmVO 4 nanocrystals with dodecahedral shape was discussed. Under excitation at 315 nm, the SmVO 4 sample exhibits strong orange emission while it as the host doped with suitable amount of Eu 3+ ions shows strong reddish orange emission. The diversity in emission intensity detected from SmVO 4 : x% Eu 3+ (x = 1, 3, 5, 7) was compared. The hydrothermal method for preparing dodecahedral SmVO 4 nanocrystals provides us an idea to synthesize other rare earth orthovanadate nanomaterials with special morphology and interesting optical property.
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