Real-Time In Situ Observations Reveal a Double Role for Ascorbic Acid in the Anisotropic Growth of Silver on Gold - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2020

Real-Time In Situ Observations Reveal a Double Role for Ascorbic Acid in the Anisotropic Growth of Silver on Gold

Jieli Lyu
Claire Goldmann
Thomas Bizien
Cyrille Hamon

Résumé

Rational nanoparticle design is one of the main goals of materials science, but it can only be achieved via a thorough understanding of the growth process and of the respective roles of the molecular species involved. We demonstrate that a combination of complementary techniques can yield novel information with respect to their individual contributions. We monitored the growth of long aspect ratio silver rods from gold pentatwinned seeds by three in situ techniques (small-angle x-ray scattering, optical extinction spectroscopy and liquid-cell transmission electron microscopy). Exploiting the difference in reaction speed between the bulk synthesis and the nanoparticle formation in the TEM cell, we show that the anisotropic growth is thermodynamically controlled (rather than kinetically) and that ascorbic acid, widely used for its mild reductive properties plays a shape-directing role, by stabilizing the {100} facets of the silver cubic lattice, in synergy with the halide ions. This approach can easily be applied to a wide variety of synthesis strategies.
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Dates et versions

hal-02997235 , version 1 (10-11-2020)

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Citer

Kinanti Aliyah, Jieli Lyu, Claire Goldmann, Thomas Bizien, Cyrille Hamon, et al.. Real-Time In Situ Observations Reveal a Double Role for Ascorbic Acid in the Anisotropic Growth of Silver on Gold. Journal of Physical Chemistry Letters, 2020, 11 (8), pp.2830-2837. ⟨10.1021/acs.jpclett.0c00121⟩. ⟨hal-02997235⟩
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