Noble metal NPs and nanoalloys by sonochemistry directly processed on nanocarbon and TiN substrates from aqueous solutions

Exploiting Interfacial Effects between Collapsing Bubbles and Nanocarbon/TiN Substrates for the Green Synthesis of Self-Organized Noble Metal and Nanoalloy Nanoparticles

“…The alloy composition may be controlled by the mixing ratio of the respective solutions. In [ 29 ], nanoalloys in close range to PtPd27 and AuPd22 were obtained by mixing equal volumes of 2 mM solutions of H 2 PtCl 6 and K 2 PdCl 4 or HAuCl 4 and K 2 PdCl 4 .…”

“…(a) Modification via sonochemistry [ 29 ]: Sonication experiments were performed using a Bandelin Sonorex RK31 (Schalltec, Welersteusslingen, Germany) bath with an ultrasonic nominal output of 40 W and ultrasonic frequency of 35 kHz. For the processing of Au-NPs, the substrate was immersed either in a 2- or 1-mM solution of HAuCl 4 and sonicated for 90 s. For the AuPd and PtPd NPs, a 1:1 mixture of HAuCl 4 and K 2 PdCl 4 (H 2 PtCl 6 ) was used under the same conditions.…”

“…Similar results were obtained with the TiN-terminated substrates, shown in Figure 3. A previous publication [29] had shown that nanoalloys of PtPd and AuPd were easily processed on both substrates via sonication in a mixture of aqueous solutions of either H 2 PtCl 6 and K 2 PdCl 4 or HauCl 4 and K 2 PdCl 4 . The alloy composition may be controlled by the mixing ratio of the respective solutions.…”

“…Further, the high-magnification micrographs, shown in Figure 5c,d, show a rather continuous interface between the Au-NPs and the underlying nanostructures, suggesting a good adhesion of the NPs. A previous publication [29] had shown that nanoalloys of PtPd and AuPd were easily processed on both substrates via sonication in a mixture of aqueous solutions of either H2PtCl6 and K2PdCl4 or HauCl4 and K2PdCl4. The alloy composition may be controlled by the mixing ratio of the respective solutions.…”

“…The alloy composition may be controlled by the mixing ratio of the respective solutions. In [29], nanoalloys in close range to PtPd27 and AuPd22 were obtained by mixing equal volumes of 2 mM solutions of H2PtCl6 and K2PdCl4 or HAuCl4 and K2PdCl4. (b) supported NMNPs and nanoalloys via a Leidenfrost-mediated reduction of metal ions Subsequent treatment of the Au-NPs containing substrates in the same manner using an aqueous solution of H 2 PtCl 6 yields bimetallic Au-Pt-NPs, where Pt partly reduces on Au-NPs leading to a rough morphology of the NPs, shown in Figure 6, and partly forms Pt-NPs on the substrate surface, decorating SWCNTs.…”