Self-generating gas sensor taking rGO/In2O3 as electrode material
A gas sensor and electrode material technology, which is applied in the direction of material analysis, material analysis, and material resistance by electromagnetic means, can solve the problems of complex preparation, large overall volume, unsuitable for portable applications, etc., and achieves low price, simple production, Easy-to-use effects
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Embodiment 1
[0032] rGO / In 2 o 3 The preparation of electrode material comprises the following steps:
[0033] ①Weigh 50mgInCl 3 4H 2O was dissolved in 9mL deionized water, and 1mL GO dispersion solution (10mg / mL) was added to sonicate for 30min to form a uniformly dispersed solution; In the digestion tank; ③Temperature control at 150°C, radiation frequency 2450±50MHz, microwave hydrothermal heating for 35min; ④The product was washed and centrifuged three times with deionized water, and dried at 100°C for 24h; ⑤Under the protection of 300mL / min nitrogen, the product Put it in a tube furnace and anneal at 400°C for 3 hours to get the final product rGO / In 2 o 3 nanoparticles. The product was characterized by X-ray energy spectroscopy (EDS) and scanning electron microscopy (SEM). 2 o 3 The mass percentage is 80%, the nanoflower particle size is 8μm, and the microscopic appearance is as figure 1 shown.
Embodiment 2
[0035] The preparation of the power generation module comprises the following steps:
[0036] We used 2.5cm×3.5cm×50μm porous polyvinylidene fluoride (pore size 10μm, porosity 54%) as the storage layer of the nanogenerator, and 1mL 10mg / mL rGO / In was spin-coated on its surface at 1400rmp 2 o 3 (In 2 o 3 The mass percentage is 68%, the particle diameter is 2 μm) ethanol dispersion liquid; Corona charging 30min makes one side of uncoated electrode material carry negative charge; With 3cm * 3.5cm PET (polyethylene terephthalate, 100nm thick Aluminum coating, PET thickness is 200μm) as the supporting layer; when assembling, the edges of the two sides with equal length overlap and are bonded with Kapton tape, and the longer PET film (3) is due to the Mechanically fixed by Kapton tape, rolled up naturally, assembled into a power generation module with a certain arc, the maximum vertical distance between the two layers of film is 1.2cm. Such as figure 2 As shown, a power genera...
Embodiment 3
[0038] Sensing of aniline:
[0039] The power generation module prepared in embodiment 2 is connected with an external test circuit, and the open circuit voltage and short circuit current of the generator are detected with a source meter, and the open circuit voltage and The change of the short-circuit current is used as the sensing signal of the sensor.
[0040] The dynamic response curves of the self-powered aniline sensor to different concentrations of aniline at room temperature are shown in Figure 4 . Control the concentration of aniline so that the gradient increases. During the test, after the signal of a certain concentration is guaranteed to be stable, a higher concentration of aniline gas is introduced. Taking the stable maximum short-circuit current signal at different concentrations, it can be seen that the sensing signal increases with the increase of aniline concentration, and the sensor has a high response sensitivity to low concentration aniline at room temp...
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