Direct formation of gold nanoparticles using ultrasound
| DWPI Title: Formation method for gold nanoparticles, involves subjecting aqueous solution that includes alkylthiol and surfactant and provided with bulk gold to ultrasonication using predetermined ultrasound frequency, to form gold nanoparticles |
| Abstract: The invention provides a green chemistry, aqueous method to synthesize gold nanoparticles directly from bulk gold sources. The method involves the ultrasonication of bulk gold in water in the presence of an alkythiol species and a quaternary ammonium surfactant. An organic bilayer forms on the surface of the gold which renders it susceptible to material ejection from the violent collapse of cavitation bubbles. This ejected material is stabilized in solution by the formation of an organic bilayer and can be easily separated. It can then be subjected to an aqueous digestive ripening step to give a gold nanoparticle ensemble with a well-defined plasmon resonance. This method is applicable to a number of different sources of bulk gold. The method can be applied to an environmentally important problem; the recovery of gold from electronic waste streams. For example, gold nanoparticles can be extracted directly from the surface of SIM cards, with no prior manipulation of the cards necessary. |
| Use: Formation method for gold nanoparticles. |
| Advantage: The formation method produces gold nanoparticles directly from bulk metal, while eliminating the need for the toxic dissolution and reduction processes. The formation method uses ultrasonication to extract gold nanostructures directly from the surface of gold source article, with no prior manipulation of the gold source article required. |
| Novelty: The formation method involves providing a bulk gold in an aqueous solution that includes an alkylthiol and a surfactant. The alkylthiol includes dodecanethiol and the surfactant includes a quaternary ammonium salt. The aqueous solution is subjected to ultrasonication using an ultrasound frequency between 20 kilohertz and 10 megahertz, to form gold nanoparticles that have particle size of less than 100 nm. |
| Filed: 4/11/2017 |
| Application Number: US15484856A |
| Tech ID: SD 13844.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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