July 14, 2015
Editors' Choice: High-Throughput Synthesis of Uniform Silver Seed Particles
Metal nanoparticles are becoming favorite objects in current plasmonics. Their extraordinary optical properties in form of sharp optical resonances, i.e., localized surface plasmon resonances (LSPR), are based on coherent oscillations of free conductive electrons upon irradiating electromagnetic waves. The position of the LSPR and, therefore, the potential application strongly depends on the material, size, and shape of the nanoparticles. These factors can be adjusted by the chemical synthesis. For an optimal synthesis, the mixing parameters are of key importance. Changes in mixing conditions can result in uncontrollable colloid morphologies and/or various sizes. Therefore, with increasing complexity of the particle shape, more control during the synthesis is needed. A. Csáki et al. described a novel system with a combination of different microfluidic units to create small and monodisperse silver seed particles. The device combined three different micromixers, namely, a split-and-recombine-mixer, a T-shaped mixer, and a Dean-flow-mixer, in one platform for a defined fluid manipulation. The chemical adducts were optimally mixed, and the resulting seed particles are well-defined and sufficiently small for the subsequent synthesis step, i.e., the growth in triangular-shaped geometry in batch.
Matthias Thiele, Andrea Knauer, Andrea Csáki*, Daniell Mallsch, Thomas Henkel, Johann Michael Köhler, and Wolfgang Fritzsche
High-Throughput Synthesis of Uniform Silver Seed Particles by a Continuous Microfluidic Synthesis Platform
Chem. Eng. Technol. 2015, 38 (7), 1131-1137.