Planar flexible room-temperature gas sensor based on printable nano composite material
A nanocomposite material and gas sensor technology, which is applied in the direction of analyzing materials, material resistance, and material analysis through electromagnetic means, can solve the problem of high operating temperature, slow down the aging and damage of materials, improve the gas-sensing performance, and the preparation method is simple Effect
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[0035] The preparation method of the above-mentioned planar flexible room temperature gas sensor comprises the following steps:
[0036] 1) Au or Ag interdigitated electrodes are deposited on polyimide or polyethylene terephthalate flexible substrates by vacuum evaporation or magnetron sputtering. The number of interdigitated electrodes is 5 to 20 pairs. The width is 1 μm ~ 100 μm, and the electrode spacing is 1 μm ~ 100 μm;
[0037] 2) Wash the flexible substrate with Au or Ag interdigitated electrodes repeatedly with deionized water and absolute ethanol, dry, and use polyimide tape to stick the area around the electrode to mask, so that the spray printing range is limited In the area where the interdigitated electrodes are located, the error between batches of sensors is reduced;
[0038] 3) Measure Ag / TiO with a concentration of 1-5 mg / mL 2 / Ti 3 C 2 Put the aqueous dispersion of T nanocomposite in the spray gun storage tank, spray it evenly on the flexible substrate wi...
Embodiment 1
[0045] (1) Two-dimensional Ti 3 C 2 T x Preparation of nanosheets: under magnetic stirring, 400 mesh Ti 3 AlC 2 The powder was slowly added to an etching solution containing 2 g LiF and 9 mol / L concentrated hydrochloric acid, and reacted with magnetic stirring at 350 rpm in a water bath at 50 °C for 36 h. After the reaction, the product was centrifuged at 3500 rpm and washed repeatedly with deionized water until the pH of the supernatant was 6–7; then the washed product was dispersed in 60–70 mL of deionized water and shaken vigorously for 30 After min, centrifuge at 3500 rpm for 30 min, and take the upper Ti 3 C 2 T x (where T represents the -F, -OH, =O active functional groups linked to the surface, and x represents the number of surface functional groups) the colloid, with a concentration of 5 mg / mL, was stored in a refrigerator at low temperature for later use.
[0046] (2) Ag / TiO 2 / Ti 3 C 2 T x Preparation of nanocomposites: Take 5 mL of Ti prepared in step (1...
Embodiment 2
[0051] (1) Two-dimensional Ti 3 C 2 T x Preparation of nanosheets: under magnetic stirring, 400 mesh Ti 3 AlC 2 The powder was slowly added to an etching solution containing 2 g LiF and 9 mol / L concentrated hydrochloric acid, and reacted with magnetic stirring at 350 rpm in a water bath at 50 °C for 36 h. After the reaction, the product was centrifuged at 3500 rpm and washed repeatedly with deionized water until the pH of the supernatant was 6–7; then the washed product was dispersed in 60–70 mL of deionized water and shaken vigorously for 30 After min, centrifuge at 3500 rpm for 30 min, and take the upper Ti 3 C 2 T x (where T represents the -F, -OH, =O active functional groups linked to the surface, and x represents the number of surface functional groups) the colloid, with a concentration of 5 mg / mL, was stored in a refrigerator at low temperature for later use.
[0052] (2) Ag / TiO 2 / Ti 3 C 2 T x Preparation of nanocomposites: Take 5 mL of Ti prepared in step (1...
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