Preparation method of carbon nanotube ink and preparation method of transistor device
A carbon nanotube and transistor technology, applied in the field of high-performance semiconductor carbon nanotube ink, can solve the problem of many printing times (some need to print dozens to 100 times to build a carbon nanotube thin film transistor device, and the device performance is not good. It has the advantages of excellent electrical performance, low cost and convenient operation.
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[0022] Wherein, the preparation method of this carbon nanotube ink comprises the steps:
[0023] Step 1: Take carbon nanotubes, surfactants, additives and water according to the mass ratio of 0.0001-0.1:0.02-5:0.0001-2:200, stir and mix them, perform ultrasonic dispersion, and prepare a suspension;
[0024] Step 2: The suspension is subjected to centrifugation and stratification, and the supernatant is separated to obtain the carbon nanotube ink.
[0025] In the method, the separated and purified carbon nanotubes are ultrasonically dispersed in an aqueous solution containing surfactants and additives, and the upper layer solution obtained after centrifugation can be used to print high-performance thin film transistor devices.
[0026] The method for using the above-mentioned carbon nanotube ink to make a transistor device is to inject the carbon nanotube ink into the ink cartridge, then print the carbon nanotube ink at a preset position, and print 1-10 times repeatedly (accord...
Embodiment 1
[0029] First, the desired carbon nanotubes are purified by chemical functional modification, density gradient ultrahigh-speed centrifugation, chromatographic separation, and electrophoresis. In this example, a high-speed centrifugal separation and purification method was adopted.
[0030] Weigh 0.01 mg of purified CoMocat 76 single-walled carbon nanotubes, put into 20 ml, 0.2% by mass of surfactant sodium dodecylsulfonate (SDS) and sodium cholate (SC) aqueous solution, Then add molecular weight 5×10 3 Polyvinylpyrrolidone (PVP) was used as an additive, and its mass-volume concentration in the dispersion was adjusted to 0.01 mg / mL, wherein the mass ratio of SDS to SC was 5:3. After stirring, ultrasonically disperse for 30 minutes with an ultrasonic cleaning machine with a power of 25W to obtain a uniformly dispersed dispersion. And the consumption of additive is under meeting the requirement of printing, and concentration is as low as possible molecular weight is as small as ...
Embodiment 2
[0033] The difference between this example and Example 1 is that: Weigh 0.3 mg of purified CoMocat 76 single-walled carbon nanotubes, put them into 20 ml of 0.4% by mass aqueous solution of surfactants SDS and SC, and then add Molecular weight is 10 4 The PVP is used as an additive, and its mass-volume concentration in the dispersion is adjusted to be 0.1 mg / mL.
[0034] The ink made by the above process is used to make transistors. After annealing, the electrical properties of transistor devices are significantly improved, from figure 1 It can be seen that the switching ratio and mobility of the transistor device are increased by nearly 10 times, while the hysteresis loop is significantly reduced. from figure 2 It can be seen that the carbon nanotube film is basically composed of a single or a few carbon nanotube bundles, there are no large carbon nanotube bundles in the film, and the morphology of the carbon nanotubes does not change significantly before and after anneali...
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