| At present, with the increasingly serious gas pollution, detection of poisonous andharmful gas is very important. But so far gas sensor has many shortcomings, such as poorstability, limited selective, low sensitivity and so on. Infrared gas sensor is a gas sensingdevice that based on the absorption properties of gas molecules to near-infrared light, anddifferent gas molecules with different absorption intensity, use the relationship of gasconcentration and absorption strength to determine the component and concentration ofgas. Compared with other types of gas sensor, such as semiconductor type, catalyticcombustion type, electric chemical type and so on, infrared gas sensor have manyadvantages. For example, long service lige, low maintenance cost, high sensitivity, moresuitable for gas, good stability, high cost performance, online analysis and wideapplication. Up to now, seeking the most suitable sensitive element for infrared gassensor has become research focus. Butterfly wings scales have the unique structures thatmake them have the special structural color. The sensitivity to external environment andthe application of this unique structure has become research focus of scientists. In thispaper, four kinds of typical butterfly wings scales were contrastive analyzed on thesensitivity to external environment of their structural colors. The most sensitive butterflystructure was identified. Selective vapor response of this structure was researched. Andthe mechanism of its sensitivity to liquid and gas was analyzed. Then the biomimeticstructure was prepared imitating the butterfly wings scales. Main content and conclusionsin this paper include:Morpho Menelaus, Trogonoptera, Papilio Ulysses, Papilio palinurus four kinds ofbutterfly were chosen for their typical structural colors. First of all, through the structureanalysis of these four kinds of butterfly found that each of them has photonic crystalstructure. Then through the tests for the selective vapor response of four kinds ofbutterfly to ether and ethanol found that four kinds of butterfly had different sensitivityto ether and ethanol. After the ether and ethanol volatilized, butterfly wings scalesrecovered the original color, and butterfly wings scales still has the sensitivity of etherand ethanol. Morpho Menelaus and Papilio Ulysses butterfly wing scales have obvioussensitivity to ether and ethanol. While butterfly wing scales of Trogonoptera and Papiliopalinurus relatively have weaker sensitivity to ether and ethanol. Secondly, through thecomparison on the selective vapor response of four kinds of butterfly scales to vapor, found that the selective vapor response of Papilio Ulysses and Papilio palinurus to vaporare not repeated. Butterfly wing scales of Morpho Menelaus have the biggest sensitivityto vapor, ether and ethanol. At the same time, the sensitivity is repeated. So MorphoMenelaus butterfly wing scales of were determined as the research prototype for sensitiveelement. Finally, through the sensitivity tests of Morpho Menelaus wing scales to vapor,ether, ethanol and carbon dioxide, found that the sensitivity is cyclical. Reason ofselective vapor response was analyzed according to the multi-layer film interferencetheory. The calculation results agree with the test results. Then Translight simulationsoftware was used to verify the selective vapor response of butterfly wing scales ontheory. The simulation results are highly consistent with the calculation results. Butterflywing scales have selective vapor response. If the butterfly wing scales structures could beapplied in gas detection sensor, the application value of the gas detection sensor would beincreased greatly.Butterfly wings scales of Morpho Menelaus as a template were copied by biologicaltemplate to get its reverse geometry. Through selective vapor response research andstructure preparation of Morpho Menelaus wing scales, this paper provides guidance forthe application of butterfly wing scales micro/nano structure in gas detection sensor. |
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