1.3.2 Size: Nanoparticle tracking analysis (NTA)
NTA on the NanoSight NS300 device was used to measure nanoparticles concentrations and size. The GNPS samples were diluted 10 or 100 times from their original concentration. They were then put through the detector at a speed of 100 units of syringe pump at a temperature of 21 °C. A 405 nm laser was used to irradiate the particles.