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Gold nanoparticles optical properties induced by water and ionic liquid (bmimBF4) inside cationic reverse micelles.

Abstract

In this work we report the effect of the polar solvent entrapped on benzyl-n-hexadecyldimethylammonium chloride (BHDC) reverse micelles (RMs), as nanoreactors for gold nanoparticles (AuNPs) synthesis. We have evaluated how the room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4) and water inside RMs, can control the interactions at the interface as a key factor on nanoparticles finals properties. The results showed the bmimBF4 supramolecular network under confinement plays an important role on the nucleation and growth mechanism of AuNPs. The results showed how the polar solvent can induce a specific interaction at the interface, including an ionic segregation, which affects the BHDC counterion chloride (Cl-) availability at interface, the droplets size, the fluidity and thus the material exchange rate between droplets. These facts strongly influence the AuNPs size, polydispersity, morphology and crystallinity. The RTIL bmimBF4 in BHDC RMs induces an ionic segregation decreasing of the Cl- ions availability at interface that favors sphericity and monocrystallinity on AuNPs formed, meanwhile water do not disturb the Cl- ions availability at interface, and the insertion of these ions on the earlier layer’s crystallinity is a key fact on the anisotropy and polycrystallinity of AuNPs obtained. As we concerned this is the first which compared the influence of the polar solvent entrapped in BHDC RMs as nanoreactors for gold nanoparticles synthesis, also is the first time bmimBF4/BHDC/toluene RMs is used as reaction media for this particular reaction.

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Publication details

The article was received on 04 Apr 2017, accepted on 05 Sep 2017 and first published on 05 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ01106G
Citation: New J. Chem., 2017, Accepted Manuscript
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    Gold nanoparticles optical properties induced by water and ionic liquid (bmimBF4) inside cationic reverse micelles.

    D. Blach and F. Martínez, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01106G

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