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Photoinduced phase separation of gold in two-component nanoparticles to form nanoprisms

A technology of silver nanoparticles, gold nanoparticles, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc.

Inactive Publication Date: 2009-04-22
NORTHWESTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, until now, this method has been limited to silver

Method used

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  • Photoinduced phase separation of gold in two-component nanoparticles to form nanoprisms
  • Photoinduced phase separation of gold in two-component nanoparticles to form nanoprisms
  • Photoinduced phase separation of gold in two-component nanoparticles to form nanoprisms

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Experimental program
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Embodiment

[0050] Silver nitrate (AgNO 3 ), trisodium citrate, polyvinylpyrrolidone (PVP) and sodium borohydride (NaBH 4 ) were purchased from Aldrich (Milwaukee, WI, USA). Bis(p-sulfonylphenyl)phenylphosphinate dipotassium salt (BSPP) dihydrate was purchased from Strem Chemicals (Newburyport, MA, USA). All chemicals were used as standard. All water was purified with a Nanopure water system (Ω=18.2 MΩ, Barnstead Ins.).

[0051] Ag-Au core-shell nanoparticles

[0052] AgNO was vigorously stirred in a round-bottomed flask at room temperature in the presence of air. 3 (0.1mM 100mL) and trisodium citrate (0.3mM) in water. 0.5 mL of freshly prepared, ice-cold (about 0°C) NaBH 4 (100 mM) was quickly injected into the mixture. The reaction mixture turned pale yellow and was stirred for 10-15 seconds before adding 1 mL of bis(p-sulfonylphenyl)phenylphosphinate dipotassium salt (BSPP, 5 mM). BSPP was added dropwise over a period of 30 seconds. Core-shell nanoparticles protected with poly...

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Abstract

Nanoprisms containing silver and gold are disclosed. The nanoprisms exhibit the properties of pure silver nanoprisms, but are less susceptible to silver modification or reaction by a surrounding environment than pure silver nanoprisms due to the presence of the gold. The gold surface of the nanoprisms can be further modified, using known gold-modification techniques.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application Serial No. 60 / 782,678, filed March 8, 2006, the entire contents of which are hereby incorporated by reference. [0003] Statement of Government Interests [0004] This invention was made with support from the US Government's National Science Foundation (NSF-NSEC) Grant No. EEC-011-8025. The US Government has certain rights in this invention. Background technique [0005] Since the early twentieth century, a great deal of research has focused on understanding the physical and chemical properties of metals at the nanoscale. Nanoscale particles of gold (Au) and silver (Ag) have been the primary targets of this research due to their optical properties, which exhibit a remarkable correlation with the size, composition, and shape of the nanoparticles (Mie, Ann. Phys.23:377(1908); Kreibig et al., Surface Science 156:678(1985); Lieber, Solid State Comm 107:607(...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22F3/00B22F1/02B22F1/054B22F1/17
CPCB22F2001/0037B22F2998/10B22F2999/00B22F1/025B22F1/0018B82Y30/00B22F1/0553B22F1/054B22F1/17B22F1/056B22F1/14B22F2202/11
Inventor 查德·A·米尔金加布里拉·麦特拉克斯金荣超
Owner NORTHWESTERN UNIV