Bright-field TEM images of the FATO Nanoparticles were acquired using a Phillips FEG CM200 transmission electron microscope with an accelerating voltage of 200 kV and equipped with a field emission gun. Samples were prepared by diluting 50 µl of the as-prepared FATO-NP dispersion in 2ml of water, and then placing one drop of this dilute dispersion on a lacey-carbon coated copper TEM grid, which was subsequently dried at 100 °C. Particle sizes were analyzed using ImageJ. Measurements were taken measuring the longest axis of the chosen particle.