Chiral metal-semiconductor heterogeneous nanomaterial and preparation method thereof
A nano-material and metal nano-technology, applied in the field of nano-materials, can solve problems that restrict the development and practical application of chiral nano-materials, single, limited functions, etc., and achieve good chiral signals, extended application fields, and good stability.
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[0058] 1) Preparation of chiral metal nanomaterials:
[0059] Reaction container treatment: Soak glassware in aqua regia for 10-12 hours in advance, then rinse with clean water and deionized water, soak, and dry for subsequent experiments;
[0060] The achiral metal nanomaterial and the chiral molecule are mixed and reacted according to the mass ratio of 1: (0.01-0.06), the time is 0.5-2h, and the temperature is 30-60°C; a solution of the chiral molecule-modified metal nanomaterial is obtained, and then Mix the metal nanomaterial solution modified by chiral molecules with the growth solution according to the volume ratio of 1: (16-24), and perform multiple overgrowth at 30-60°C, the reaction time is 0.5-2h, and the number of overgrowth is 1 ~5 times; the precipitate was collected by centrifugal washing, and the chiral metal nanomaterial precipitate was obtained.
[0061] Wherein, the achiral metal nanomaterial is gold nanorod or gold nanotriangular sheet;
[0062] The chiral...
Embodiment 1
[0080] Preparation of embodiment 1 chiral metal nanomaterial (chiral Au nanorod):
[0081] Mix the achiral gold nanorods and the L-cysteine solution with a concentration of 1mM according to the mass ratio of 1:0.01, and react at 35°C for 1h to obtain the chiral molecule-modified gold nanorods solution, and then the hand The gold nanorod solution modified by sexual molecules and the growth solution of hexadecyltrimethylammonium chloride, chloroauric acid and ascorbic acid with a molar ratio of 7:6:900 were mixed according to the volume ratio of 1:20, and reacted at 60°C for 0.5 h, after centrifugation and washing twice, in order to eliminate the influence of chiral molecules and make the chiral gold helical morphology more obvious, continue to repeat the above growth steps, and overgrow the gold nanostructures three times.
[0082] The transmission electron microscope pictures of the prepared chiral gold nanorods are as follows: figure 1 , showing a dumbbell structure with t...
Embodiment 2
[0083] Preparation of embodiment 2 chiral metal nanomaterials (chiral Au polyhedral nanomaterials):
[0084] The difference from Example 1 is that different mass ratios, reaction temperatures, reaction times or growth times are used to obtain chiral gold polyhedral nanomaterials.
[0085] The specific steps are: mix the achiral gold nanorods and the D-cysteine solution with a concentration of 1mM according to the mass ratio of 1:0.06, and react at 60°C for 1h to obtain the chiral molecule-modified gold nanorods solution , and then the gold nanorod solution modified by chiral molecules and the growth solution of hexadecyltrimethylammonium bromide, chloroauric acid and ascorbic acid with a molar ratio of 7:10:900 were mixed according to the volume ratio of 1:16, 40 After reacting at ℃ for 1 h, centrifuging and washing twice, in order to eliminate the influence of chiral molecules and make the shape of the chiral gold helix more obvious, the above growth steps were repeated to ...
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