Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
TEM images of synthesised gold nanoparticles. (a) gold nanoparticles (approximately20 nm) prepared with 243 kJ (30 min with 135 W ultrasonic power) of sonication; (b) gold nanoparticles (20 to 50 nm) prepared with 729 kJ (90 min with 135 W ultrasonic power) of sonication. Initial HAuCl4 concentration was 0.25 mM and molar ratio between HAuCl4 and sodium citrate was set at 1:3.5.
