Continuous segmented-flow synthesis of Ag and Au nanoparticles using a low-cost microfluidic PTFE tubing reactor

Gustavo Ochoa-Vazquez (1) , Boris Kharisov (2) , Ana Arizmendi-Morquecho (3) , Anaïs Cario (4) , Cyril Aymonier (4) , Samuel Marre (4) , Israel López (1)

1 Facultad de Ciencias Químicas
2 Facultad de Ciencias Químicas
3 Centro de Investigación en Materiales Avanzados
4 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

We present in here a simple and low cost continuous segmented-flow process for the synthesis of Ag and Au spherical-shaped nanoparticles. Different residence times (RT) were used to perform the nanoparticle synthesis, observing that at low RT, the Ag nanoparticles production, which uses a fast reduction reaction with NaBH4, is improved due to an enhancement in the mixing of the reactants. However, the flow conditions have an opposite effect in the case of Au nanoparticles synthesis. Indeed, since the chemical reduction process (Turkevich method) exhibit a much slower kinetics, high RT (low flowrates) improve the synthesis yield and the quality of the nanoparticles. The Ag and Au nanoparticles were characterized by UV-Vis spectrophotometry (UV-Vis) and Transmission Electron Microscopy (TEM). The Ag spherical-shaped nanoparticles presented a LSPR at 400 nm (size ≈ 4 nm), while the synthesized Au nanoparticles exhibit LSPR and sizes in the range 520 - 550 nm and 14 - 17 nm, respectively.

Mots clés: Ag nanoparticles; Au nanoparticles; Flow synthesis; Microfluidics; Microfluidic synthesis; Noble metal nanoparticles

Domaines: Matériaux

Gustavo Ochoa-Vazquez, Boris Kharisov, Ana Arizmendi-Morquecho, Anaïs Cario, Cyril Aymonier, et al.. Continuous segmented-flow synthesis of Ag and Au nanoparticles using a low-cost microfluidic PTFE tubing reactor. IEEE Transactions on NanoBioscience, 2022, 21 (1), pp.135-140. ⟨10.1109/TNB.2021.3101189⟩. ⟨hal-03351576⟩