jz0c00121_si_002.mp4 (2.97 MB)
Real-Time In Situ Observations Reveal a Double Role for Ascorbic Acid in the Anisotropic Growth of Silver on Gold
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posted on 2020-03-27, 16:11 authored by Kinanti Aliyah, Jieli Lyu, Claire Goldmann, Thomas Bizien, Cyrille Hamon, Damien Alloyeau, Doru ConstantinRational
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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Gold Rational nanoparticle designtechniqueshape-directing rolematerials sciencesynthesis strategiesTEM cellAnisotropic Growthreaction speedaspect ratio silver rodshalide ionsanisotropic growthnovel informationbulk synthesisDouble Roleascorbic acidgrowth processSitu Observations Revealextinction spectroscopysmall-angle X-raygold pentatwinned seedsliquid-cell transmission electron microscopyreductive propertiesnanoparticle formation
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