Printable liquid metal ink and preparation method thereof

The invention discloses printable liquid metal ink and a preparation method thereof.The preparation method comprises the following steps that (1) gallium-indium alloy is taken and placed in hydrochloric acid with the high concentration, it is ensured that hydrochloric acid can completely cover the gallium-indium alloy, and incubation is conducted overnight; (2) washing with absolute ethyl alcohol for three times to ensure that the hydrochloric acid is completely removed, adding p-aniline derivatives and nano-clay, and mixing until the p-aniline derivatives and the nano-clay are dissolved; 3) performing ultrasonic modification by using an ultrasonic cell crusher; (4) the liquid metal nanoparticles obtained in the step (3) are washed with water; 5) dissolving a polyethylene copolymer in water; and 6) using deionized water to resuspend the liquid metal particles in the step 4), and then mixing with the ink carrier obtained in the step 4) to obtain the liquid metal ink. Compound modification is carried out by ado