Sonochemical synthesis of porous gold nano- and microparticles in a Rosette cell

• Published in: Ultrasonics sonochemistry Vol. 79; p. 105744
• Main Authors: Usen, Ndifreke, Dahoumane, Si Amar, Diop, Mamadi, Banquy, Xavier, Boffito, Daria C.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-11-2021; Elsevier
• Subjects: Anisotropic particles; Glucose; Gold nanoparticles; Original; Porous particles; Rosette cell; Sonochemistry; Rosette cell; Glucose; Sonochemistry; Anisotropic particles; Gold nanoparticles; Porous particles
• ISSN: 1350-4177; 1873-2828
• DOI: 10.1016/j.ultsonch.2021.105744

•We synthesized Au nanoparticles in a Rosette cell sonochemically.•Direct sonication of HAuCl4 and α-D-C6H12O6 produces anisotropic Au at pH 5.•Direct sonication of HAuCl4 and β-D-C6H12O6 produces potato shaped gold Au at pH 12.•Sonication for 40 min reduces the appearance of pores in Au potatoes.•Intermittent pulsed ultrasound reduces more HAuCl4 in solution with C6H12O6.
We report the synthesis of Au nano- and microparticles that relies on α-D-glucose (C6H12O6) as the reducer and stabilizer in a Rosette cell under 20 kHz ultrasound irradiation. The chemical and physical effects of ultrasonic irradiation on the synthesis were investigated. The results showed that an optimum pH is required for the formation of insoluble Au(0) particles. Upon irradiation, low pH yielded Au nanoparticles while high pH resulted in microparticles. The Au surface capping by α-D-glucose hydroxyl and carbonyl groups was confirmed by Fourier transform infrared (FT-IR) spectroscopy. X-ray diffraction (XRD) analysis indicated that the Au particles crystallize within the face-centered-cubic (FCC) cell lattice. Moreover, continuous sonication reduced larger amounts of the Au precursor compared to the intermittent mode. Furthermore, tuning sonication time and mode influences the particle size and porosity as characterized by scanning and transmission electron microscopy. Our results shed a new light into the importance of the experimental and ultrasound parameters in obtaining Au particles of desired features through sonochemistry.