Synthesis of chiral nanoparticles using circularly polarized light

Patent metadata

Field	Value
Publication number	US-2016167136-A1
Application number	US-201514940845-A
Country	US
Kind code	A1
Filing date	Nov 13, 2015
Priority date	Nov 14, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

New methods of forming chiral nanoparticles (e.g., nano structures) are provided. The method comprises directing circular polarized light (CPL) towards a nanoparticle precursor to cause a photo induced reaction of the nanoparticle precursor and induce chirality to form a stable chiral nanoparticle. In this manner, CPL is used to template chirality onto nanoparticles without use of any chiral component or chiral ligands for inducing chirality to the particle in such a method. The nanoparticles may include a variety of light-absorbing materials (e.g., CdTe, CdS, Au, and the like). Such methods provide a rapid, simple, and inexpensive way of forming chiral nanoparticles that have long term chiral stability.

First claim

What is claimed is:

1 . A method of forming a chiral nanoparticle comprising:
directing circular polarized light towards a nanoparticle precursor to cause a photo-induced reaction of the nanoparticle precursor that induces chirality therein to form the chiral nanoparticle.

2 . The method of claim 1 , wherein the nanoparticle precursor and the chiral nanoparticle are free of any ligands for inducing chirality.

3 . The method of claim 1 , wherein the nanoparticle precursor comprises a first component for forming the chiral nanoparticle and a second component that serves as a capping agent on the chiral nanoparticle.

4 . The method of claim 1 , wherein the nanoparticle precursor is a dispersion of a first component for forming the chiral nanoparticle in an aqueous medium.

5 . The method of claim 1 , wherein the nanoparticle precursor comprises an element selected from the group consisting of: gold, cadmium, silver, copper, nickel, iron, carbon, platinum, silicon, mercury, lead, molybdenum, iron, and combinations thereof.

6 . The method of claim 1 , wherein the chiral nanoparticle is selected from the group consisting of: gold, silver, copper, nickel, iron, carbon, platinum, silicon, CdTe, CdSe, CdS, HgTe, HgSe, HgS, PbTe, PbSe, PbS, MoS 2 , FeS 2 , FeS, FeSe, and combinations thereof.

7 . The method of claim 1 , wherein the chiral nanoparticle is selected from the group consisting of: gold, CdTe, CdSe, CdS, and combinations thereof.

8 . The method of claim 1 , wherein the chiral nanoparticle is a nanoribbon.

9 . The method of claim 1 , wherein the chiral nanoparticle has a length of greater than or equal to about 2 nm to less than or equal to about 5 μm.

10 . The method of claim 1 , wherein the circular polarized light is a left-handed circular polarized light, so that the directing of the circular polarized light induces left-handed chirality in the chiral nanoparticle.

11 . The method of claim 1 , wherein the circular polarized light is a right-handed circular polarized light, so that the directing of the circular polarized light induces right-handed chirality in the chiral nanoparticle.

12 . The method of claim 1 , wherein the chiral nanoparticle is stable and maintains its chiral properties for greater than or equal to about 3 years.

13 . A chiral nanoparticle comprising:
a light-absorbing material selected from the group consisting of: gold, silver, copper, nickel, iron, carbon, platinum, silicon, CdTe, CdSe, CdS, HgTe, HgSe, HgS, PbTe, PbSe, PbS, MoS 2 , FeS 2 , FeS, FeSe, and combinations thereof, wherein the chiral nanoparticle exhibits chirality and is substantially free of any chirality-inducing ligands.

14 . The chiral nanoparticle of claim 13 , wherein the light-absorbing material is an inorganic material nanoparticle selected from the group consisting of: gold, silver, copper, nickel, iron, platinum, silicon, CdTe, CdSe, CdS, HgTe, HgSe, HgS, PbTe, PbSe, PbS, MoS 2 , FeS 2 , FeS, FeSe, and combinations thereof.

15 . The chiral nanoparticle of claim 13 , wherein the chiral nanoparticle is selected from the group consisting of: gold, CdTe, CdSe, CdS, and combinations thereof.

16 . The chiral nanoparticle of claim 13 , wherein the chiral nanoparticle exhibits right-handed chirality or left-handed chirality.

17 . The chiral nanoparticle of claim 13 , wherein the chiral nanoparticle is stable and maintains its chirality for greater than or equal to about 1 year.

18 . The chiral nanoparticle of claim 13 , wherein the chiral nanoparticle is stable and maintains its chirality for greater than or equal to about 3 years.

19 . The chiral nanoparticle of claim 13 , wherein the chiral nanoparticle is a nanoribbon.

Assignees

• Univ Michigan

Inventors

• Kotov Nicholas A
• Yeom Jihyeon

Classifications

• B22F1/0551

  Flake form nanoparticles · CPC title

• C01G11/02

  Sulfides · CPC title

• C01B19/007

  Tellurides or selenides of metals (C01B19/002 takes precedence) · CPC title

• B22F9/24 Primary

  starting from liquid metal compounds, e.g. solutions · CPC title

• C01P2004/17

  Nanostrips, nanoribbons or nanobelts, i.e. solid nanofibres with two significantly differing dimensions between 1-100 nanometer · CPC title