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X-Ray Scattering Studies of Gold Nanoparticle Synthesis at the Liquid-Liquid Interface

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posted on 25.07.2018 by Umme Urmee
The temporal evolution of the structure of gold nanoparticles was investigated during their synthesis at an electrified liquid-liquid interface. Although nanoparticles are often grown at internal liquid-liquid interfaces, we studied a novel synthetic route that allowed the growth to be triggered in time by voltage and confined in space to the interface. The electrodeposition of gold was achieved by the reduction of AuCl−1 with tri-p-tolylamine at the interface between water and 1,2-dichloroethane in a custom made electrochemical cell. Grazing incidence small angle X-ray scattering (GISAXS) at the Advanced Photon Source was used to follow the temporal evolution of the gold nanoparticle synthesis. GISAXS results are produced by an initial fast reduction of Au ions to form gold nanoparticles of about 20 nm in radius, which slowly increase in size to about 24 nm. Subsequent fast coalescence forms larger nanoparticles.

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Advisor

Schlossman, Mark

Chair

Wedgewood, Lewis

Department

Chemical Engineering

Degree Grantor

University of Illinois at Chicago

Degree Level

Doctoral

Committee Member

Liu, Ying Sharma, Vivek Nitsche, Ludwig

Submitted date

May 2018

Issue date

11/12/2017

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