US 12,226,834 B2
Method for laser-induced growth of nano-units to form oriented, chiral, and complex structures
Tao Ding, Wuhan (CN); and Xiaolin Lu, Wuhan (CN)
Assigned to WUHAN UNIVERSITY, Wuhan (CN)
Filed by WUHAN UNIVERSITY, Wuhan (CN)
Filed on Nov. 24, 2021, as Appl. No. 17/535,566.
Application 17/535,566 is a continuation of application No. PCT/CN2021/073205, filed on Jan. 22, 2021.
Claims priority of application No. 202011174634.0 (CN), filed on Oct. 28, 2020.
Prior Publication US 2022/0126364 A1, Apr. 28, 2022
Int. Cl. B22F 9/20 (2006.01); C23C 14/02 (2006.01); C23C 14/16 (2006.01); C23C 14/24 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC B22F 9/20 (2013.01) [C23C 14/025 (2013.01); C23C 14/16 (2013.01); C23C 14/24 (2013.01); B22F 2301/255 (2013.01); B22F 2304/05 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for laser polarization-induced growth of fusiform gold nano-units, comprising the following steps:
step 1. preparation of a gold substrate
with a thermal evaporation instrument, vapor-depositing chromium on a silicon substrate as an adhesion layer, and vapor-depositing a gold layer to obtain a gold film on the adhesion layer; and cutting an entire structure consisting of the silicon substrate, the adhesion layer and the gold film into pieces, and storing the pieces in a dry box for further use;
step 2. preparation of a sample
taking a piece of the entire structure, adding a chloroauric acid solution dropwise on the gold film with a pipette, and covering with a cover glass such that the gold film is completely immersed in the chloroauric acid solution to obtain the sample;
step 3. laser-induced oriented growth of single fusiform gold nanoparticles
coupling a linearly polarized laser into an optical microscope, and focusing the linearly polarized laser on a surface of the gold film in the sample through an objective lens to conduct irradiation for 10 s to 25 s at an irradiation power of 3 mW to 6 mW, and adjusting a direction of the linearly polarized laser to obtain gold fusiform nanoparticles with a corresponding orientation.