Laser-assisted synthesis of Au-Ag alloy nanoparticles in solution.
By using laser-induced heating, we prepared Au-Ag nanoalloys via three different procedures: (i) mixture of Au nanoparticles and Ag(+) ions irradiated by a 532 nm laser, (ii) mixture of Au and Ag nanoparticles irradiated by a 532 nm laser, and (iii) mixture of Au and Ag nanoparticles irradiated by a 355 nm laser. Procedure i is advantageous for the production of spherical alloy nanoparticles; in procedures ii and iii, nanoalloys with a sintered structure have been obtained. The morphology of the obtained nanoalloys depends not only on the laser wavelength but also on the concentration of nanoparticles in the initial mixture. When the total concentration of Ag and Au nanoparticles in the mixture is increased, large-scale interlinked networks have been observed upon laser irradiation. It is expected that this selective heating strategy can be extended to prepare other bi- or multi-metallic nanoalloys.
Institut für Physikalische Chemie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
Zhangquan
Z
Peng
Bernd
B
Spliethoff
Bernd
B
Tesche
Thomas
T
Walther
Karl
K
Kleinermanns
D000497:Alloys / Q000138:chemical synthesis* / Q000737:chemistry / Q000528:radiation effects*; D006046:Gold / Q000737:chemistry / Q000528:radiation effects*; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry / Q000528:radiation effects*; D046529:Microscopy, Electron, Transmission / Q000379:methods; D010316:Particle Size; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry / Q000528:radiation effects*; D012996:Solutions / Q000737:chemistry
D000497:Alloys; D012996:Solutions; D012834:Silver; D006046:Gold