Collective chirality of binary plasmonic nanoparticles janus assemblies
AssigneesLibing Wang, Chuanlai Xu, Liguang Xu, Xiaoling Wu
InventorsLibing WANG, Chuanlai Xu, Liguang Xu, Xiaoling Wu
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Abstract
Multiple properties of plasmonic assemblies are determined by their geometrical organization. This patent focuses on the formation of Janus structure of the asymmetric assembly structure of the gold nanorods and gold nanoparticles. Chiral structure of gold nanorods and gold nanoparticles can be obtained through the characterization of optical spectra of the Janus structure. And it opens the door for the explanation of the mechanism of the chirality, plays a strong guiding role in the negative refractive material above and has good application prospects.
Claims10
A novel preparation method of nanoparticle Janus assemblies comprising the steps of:
- (1) gold nanoparticles are synthesized by reduction of HAuCl4 using trisodium citrate;
- (2) gold nanorods are prepared by seed-mediated growth procedure;
- (3) the synthesized gold nanoparticles based on step (1), couple with sulfydryl modified DNA to form the complexes of Au NP-DNA;
- (4) the prepared gold nanorods based on step (2), are modified with DNA on the sides of Au NR;
- (5) magnetic nanoparticles (MNP) conjugate with amino modified DNA by EDC procedure;
- (6) the prepared Au NR-DNA complexes hybridize with MNP-DNA complexes, according to step (4) and (5), forming the assembly of gold nanorods and magnetic nanoparticles;
- (7) after adding a nucleotide strand of SEQ ID NO:
- 4 complementary to the remaining sequence of SEQ ID NO:
- 3 modified on the magnetic nanoparticles, the DNA ligase is added for asymmetric extension of DNA modified on the gold nanorods;
- (8) the gold nanorods are recovered through magnetic separation following the dissociation of superstructures of gold nanorods and magnetic nanoparticles formed in the step (7) at the melting temperature;
- (9) based on step (3) and (8), the prepared Au NP-DNA complexes hybridize with Au NR-DNA complexes to obtain binary plasmonic nanoparticles Janus assemblies;
- (10) the prepared binary nanoparticles Janus assemblies based on step (9) are characterized by transmission electron microscopy (TEM), circular dichroism spectra (CD) as well as synchrotron small-angle X-ray scattering (S-SAXS).
Dependencies are inferred from the claim text.