Stannic oxide hollow porous film gas sensitive element and preparation method thereof

Abstract

The invention discloses a stannic oxide hollow porous film gas sensitive element and a preparation method thereof. The gas sensitive element is characterized by covering a thin film formed by a single-layer stannic oxide hollow sphere on a substrate accompanied by an electrode, wherein the thickness of the thin film is 90 to 130nm, the diameter of the hollow sphere is 90 to 130nm, the wall thickness is 15 to 25nm, the diameter of each particle forming a sphere wall is 15 to 25nm, and the pore space between each two particles is 2 to 4nm. The method comprises the steps of adding stannic chloride pentahydrate into an ethanol water, stirring, adding a hydrochloric acid solution to obtain a mixed liquor, carrying out sealed reaction on the mixed liquor, carrying out solid-liquid separation on the mixed liquor, and washing to obtain a stannic oxide hollow sphere; adding a mercapto-type modifier into a stannic oxide hollow sphere ethyl alcohol dispersion liquid, stirring, carrying out solid-liquid separation, and washing to obtain mercapto-modified stannic oxide hollow sphere; adopting an air-water interface self-assembly method for self-assembling the mercapto-modified stannic oxide hollow sphere on a water surface so as to obtain a single-layer stannic oxide hollow sphere thin film, using the substrate accompanied by the electrode for fishing out, and drying to obtain a target product. The stannic oxide hollow porous film gas sensitive element is easy to be widely used in high sensitivity trace detection of methyl mercaptan gas.

Description

technical field [0001] The invention relates to a gas sensor and a preparation method, in particular to a tin oxide hollow porous film gas sensor and a preparation method thereof. Background technique [0002] Methyl mercaptan is a kind of volatile organic sulfide, and it will cause greater damage to the human respiratory system and nervous system at a lower concentration (>0.5ppm). This highly toxic organic sulfide is widely found in sewage treatment, petroleum refining, pulp industry and energy-related treatment processes. [0003] Tin oxide (SnO 2 ) is an important n-type semiconductor, which has been widely used in solar cells, catalytic support materials, chemical sensors and other fields. With the development of nanoscience and technology, in order to make tin oxide have better sensing performance, people have synthesized tin oxide nanomaterials with various shapes, such as the title "NO 2 Sensing performance of SnO 2 hollow-spheres sensor", Sensor and Actuators...

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Problems solved by technology

Although this product can be used for the detection of nitrogen dioxide gas, there are deficiencies with its preparation method. At first, the product cannot detect methyl mercaptan gas; Full contact with the gas; again, when detecting nitrogen dioxide gas, the product must first be loaded onto the electrode by brushing, not only the variable shape and uncontrollable coverage will cause the thickness of the sensing film to be uneven, It also makes the sensing film non-repeatable, and has the defect of complex operation; again, the preparation method cannot obtain the product of detecting methyl mercaptan gas.

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