Resistive hydrogen sensor based on nano composite material and preparation method thereof
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A nano-composite, resistive technology, applied in the field of hydrogen sensors, can solve problems such as non-quantification, and achieve the effects of simple operation, stable product performance and good reproducibility
Active Publication Date: 2014-10-01
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
In the existing technology, the detection of hydrogen leakage generally uses sensitive components, mostly non-quantitative detection, only simple alarm information is given, and most of them can only be detected at high temperatures. Therefore, quantitative detection of hydrogen in room temperature air content is particularly important
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Embodiment 1
[0026] 1) Take a 4cm×0.8cm titanium piece, ultrasonically clean it in ethanol and acetone for 1 hour respectively, dry it under nitrogen flow, and set it aside.
[0027] 2) Take 0.6686 g NH 4 Dissolve F in 5 ml of water, add 195 ml of ethylene glycol to it, stir, and use two electrodes to electrodeposit titanium oxide sheets to form TiO on the surface of the titanium sheets. 2 Nanotubes, using Pt as the negative electrode and titanium sheet as the positive electrode, with an oxidation potential of 60 V, were taken out after 1 h, washed with absolute ethanol, ultrasonicated in absolute ethanol for 3 s, dried in air, and placed in a muffle furnace at 450 °C Firing 3h.
[0028] 3) The fired titanium sheet was used as the working electrode, Pt was used as the counter electrode, and 0.1 mM PdCl at pH=3 2 , deposited at a constant potential of -0.3 V for 3 min, removed, washed with deionized water, and dried in air.
[0029] 4) Use the above titanium sheet as the working elect...
Embodiment 2
[0032] Take a 4 cm × 0.8 cm titanium piece, ultrasonically clean it in ethanol and acetone for 1 hour each, and dry it under nitrogen flow for later use.
[0033] 2) Take 0.6686 g NH 4 Dissolve F in 5 ml of water, add 195 ml of ethylene glycol to it, stir, and use two electrodes to electrodeposit titanium oxide sheets to form TiO on the surface of the titanium sheets. 2 Nanotubes, using Pt as the negative electrode and titanium sheet as the positive electrode, with an oxidation potential of 60 V, were taken out after 1 h, washed with absolute ethanol, ultrasonicated in absolute ethanol for 3 s, dried in air, and placed in a muffle furnace at 450 °C Firing 3h.
[0034] 3) The fired titanium sheet was used as the working electrode, Pt was used as the counter electrode, and the 0.1 mM H 3 PtCl 6 , deposited at a constant potential of -0.5V for 3 min, removed, washed with deionized water, and dried in air.
[0035] 4) Use the above-mentioned titanium sheet as the working el...
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Abstract
The invention discloses a resistive hydrogen sensor based on a nano composite material and a preparation method thereof. A copper sheet with a conductive adhesive on one side is attached to a prepared hydrogen sensitive nano composite material, then a lead wire is connected with the copper sheet, and the change of resistance of the composite material is detected to detect the hydrogen concentration. The hydrogen sensor can quantitatively detect the concentration of hydrogen under a room temperature condition and is easy to operate and high in reproducibility. According to the resistive hydrogen sensor prepared by the preparation method, polyaniline, Pd nano particles and a titanium dioxide nano tube composite material are prepared by a layer-by-layer electrodeposition method; a titanium dioxide nano tube is high in chemical stability and has a large specific surface area, so that the dispersion of the Pd nano particles is effectively enhanced; polyaniline is electrodeposited on the titanium dioxide nano tube composite material, so that the stability and the selectivity of hydrogen detection at room temperature are improved; furthermore, the resistive hydrogen sensor has the advantages of simple technology, wide application range, low manufacturing cost and the like.
Description
technical field [0001] The invention relates to a hydrogen sensor, in particular to a resistive hydrogen sensor based on a nanocomposite material and a preparation method thereof. Background technique [0002] Hydrogen, as an efficient and clean secondary energy source, has attracted widespread attention from all over the world, and as a basic chemical raw material, it has been widely used in aerospace industry, petrochemical industry, national defense industry, metallurgical industry and other fields. The development of hydrogen energy system includes the production, storage, transportation and utilization of hydrogen, and every link is inseparable from the detection of hydrogen. This is because hydrogen molecules are very small and easy to leak, and hydrogen is colorless and odorless, with a wide range of explosion limits (4% to 75%), and will explode when exposed to open flames. Once an accident occurs, it will cause serious harm to human life and national property safet...
Claims
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