A method for preparing millimeter-scale two-dimensional single crystal gold flakes
A gold flake and single crystal technology, applied in the field of micro-nano material preparation, can solve the problems of difficult industrialized mass production, limited gold flake size, complicated preparation process, etc., and achieves low requirements for experimental equipment, good biocompatibility, and high preparation simple steps
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Embodiment 1
[0035] Taking silk fibroin protein as an example, the preparation of protein nanofibers assists the preparation of super-sized two-dimensional gold sheets:
[0036] Cut the cocoon into an area of about 1cm 2 The fragments were immersed in an excess mass fraction of 0.5wt% sodium bicarbonate solution for 30 minutes at a high temperature of 100°C for degumming treatment. After soaking, the soaking was repeated twice to obtain silk fibroin, and the silk fibroin was dried at 40°C. The silk fibroin solid was placed in a 9.3M lithium bromide solution, stirred and dissolved at 10-800 rpm for one hour, the dissolution temperature was 60°C, and the mass fraction of silk fibroin during dissolution was 10%. After that, the silk fibroin solution was dialyzed at 4°C with a dialysis bag with a cut-off of 8000-14000Da for 3 days, and centrifuged at 4°C to remove some insoluble matter at a centrifugal speed of 8000 rpm and a centrifugation time of 20 min. A purified silk fibroin solution ...
Embodiment 2
[0043] Taking silk fibroin as an example, the implementation of protein nanofibers to assist in the preparation of super-sized two-dimensional gold flakes:
[0044] The difference from Example 1 is:
[0045] The purified silk fibroin solution was diluted with water to 1 mg / mL, ethanol was added and the volume fraction of ethanol was adjusted to 9%, the pH of the solution was adjusted to 9.7 with 1 M sodium hydroxide, and left standing at room temperature for 3 days to obtain silk fibroin Protein Nanofiber Dispersion. The silk fibroin nanofibers were diluted with water to 1 mg / mL, and the pH of the solution was adjusted to 1.0 with 1 M hydrochloric acid. An equal volume of tetrachloroauric acid aqueous solution with a concentration of 40 mM was added; solid sodium chloride was added to make the final concentration of sodium chloride in the mixed solution 1.5M. The mixed solution was placed in a sealed container and left to react at 80°C for 6 days. Transfer the reaction solu...
Embodiment 3
[0047] Taking silk fibroin as an example, protein nanofibers are used to assist in the preparation of super-sized two-dimensional gold sheets: the differences from Example 1 are:
[0048] The purified silk fibroin solution was diluted with water to 2 mg / mL, ethanol was added and the volume fraction of ethanol was adjusted to 7%, the pH of the solution was adjusted to 9.3 with 1 M sodium hydroxide, and left standing at room temperature for 3 days to obtain silk fibroin Protein Nanofiber Dispersion. The silk fibroin nanofibers were diluted with water to 2 mg / mL, and the pH of the solution was adjusted to 2.5 with 1 M hydrochloric acid. An equal volume of aqueous tetrachloroauric acid solution with a concentration of 20 mM was added; solid sodium chloride was added to make the final concentration of sodium chloride in the mixed solution 0.5M. The mixed solution was placed in a sealed container, left to react at 80° C. for 6 days, and washed to obtain a two-dimensional single-cry...
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