Particle Size Control of 11-Mercaptoundecanoic Acid-Protected Au Nanoparticles by Using Heat-treatment Method

Carboxylic acid-functionalized Au nanoparticles with very small and uniform core size (1.8 nm) could be prepared on the basis of the Brustʹs two phase method using 11-mercaptoundecanoic acid (MUA) as a surfactant. Various sizes of MUA-protected Au nanoparticles (MUA-Au) were obtained by the heat-treatment method in the solid state from 150 to 170 °C.