Plasmonic-Driven Synthesis of Nanoprisms from Isotropic and Anisotropic Gold Cores

Abstract

A nanoprism having a prismatic silver shell formed about a gold core and a process of forming the same are disclosed. The process includes irradiating a mixture of gold and silver nanoparticles with a narrow band of wavelengths capable of exciting the surface plasmon resonance of the gold.

1 . A nanoprism comprising a gold core and a silver prismatic shell. 
     
     
         2 . A nanoprism having a gold core and a silver prismatic shell produced by a process comprising:
 irradiating a mixture comprising at least one gold nanoparticle and at least one silver nanoparticle with a narrow band of wavelengths capable of exciting a surface plasmon resonance of the gold nanoparticle.   
     
     
         3 . The nanoprism of  claim 1 , wherein the nanoprism has a surface plasmon excitation resonance hand of about 500 nm. 
     
     
         4 . The nanoprism of  claim 1 , wherein the nanoprism has a characteristic resonance at one or more of about 336 nm about 452 nm, and about 632 nm. 
     
     
         5 . The nanoprism of  claim 1 , wherein the gold core is substantially spherical. 
     
     
         6 . The nanoprism of  claim 1 , wherein the gold core is a prism. 
     
     
         7 . The nanoprism of  claim 6 , wherein the gold core is a triangular prism. 
     
     
         8 . The nanoprism of  claim 1 , wherein the silver prismatic shell is a triangular prism. 
     
     
         9 . The nanoprism of  claim 1 , wherein the nanoprism has a thickness of about 2 to about 50 nm. 
     
     
         10 . The nanoprism of  claim 1 , wherein the nanoprism has an average edge length of about 50 to about 300 nm. 
     
     
         11 . The nanoprism of  claim 2 , wherein the mixture is irradiated for a time of about 1 to about 100 hours. 
     
     
         12 . The nanoprism of  claim 2 , wherein the ratio of gold to silver nanoparticles is about 1:5 to about 1:100. 
     
     
         13 . The nanoprism of  claim 2 , wherein the gold nanoparticle has a diameter of about 2 to about 50 nm. 
     
     
         14 . The nanoprism of  claim 2 , wherein the gold nanoparticle has a diameter of about 2 to about 8 nm, and the nanoprism has a thickness of about 7 to about 10 nm. 
     
     
         15 . The nanoprism of  claim 2 , wherein the gold nanoparticle has a diameter of about 20 to about 30 nm, and the nanoprism has a thickness of about 25 to about 45 nm. 
     
     
         16 . The nanoprism of  claim 2 , wherein the silver nanoparticle has a diameter of about 1 to about 10 nm. 
     
     
         17 . The nanoprism of  claim 2 , comprising irradiating with a narrow band of wavelengths of about 500 nm to about 700 nm. 
     
     
         18 . The nanoprism of  claim 2 , wherein the narrow band of wavelengths comprises wavelengths of about 600 to about 700 nm and the nanoprism has an average edge length of about 75 to about 100 nm. 
     
     
         19 . The nanoprism of  claim 2 , wherein the narrow band of wavelengths comprises wavelengths of about 500 to about 525 nm and the nanoprism has an average edge length of about 40 to about 60 nm. 
     
     
         20 . The nanoprism of  claim 2 , wherein the narrow band of wavelengths comprises wavelengths of about 530 to about 580 nm and the nanoprism has an average edge length of about 65 to about 80 nm. 
     
     
         21 . The nanoprism of  claim 2 , wherein the narrow band of wavelengths comprises wavelengths of about 750 to about 1400 nm and the gold core is a prism. 
     
     
         22 . The nanoprism of  claim 21 , wherein the gold core is a triangular prism.