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Issue 30, 2011
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On the formation of anisotropic gold nanoparticles by sputtering onto a nitrile functionalised ionic liquid

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Abstract

Sputtering deposition of gold onto the 1-(butyronitrile)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BCN)MI·N(Tf)2 ionic liquid (IL) has generated colloidal and stable gold nanospheres (AuNS) and gold nanodisks (AuND) in a bimodal size distribution. Upon increasing the sputtering discharge voltage, three distinct phenomena were observed: (i) the mean diameter of both AuNS and AuND decreased; (ii) the population with lower diameters increased and (iii) the formation of AuND disappeared at voltages higher than 340 V. By dissolving the colloidal gold nanoparticles (AuNPs) in isopropanol and dropping the product onto carbon-coated Cu grids, 2D and 3D superlattices tended to be formed, as observed by transmission electron microscopy (TEM). Therefore, the formation of AuND is probably related to a strong interaction between sputtered Au atoms of low kinetic energy and the nitrile groups orientated to the vacuum phase of the IL surface, which drives the preferential anisotropic lateral growth.

Graphical abstract: On the formation of anisotropic gold nanoparticles by sputtering onto a nitrile functionalised ionic liquid

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Article information


Submitted
03 May 2011
Accepted
15 Jun 2011
First published
05 Jul 2011

Phys. Chem. Chem. Phys., 2011,13, 13552-13557
Article type
Paper

On the formation of anisotropic gold nanoparticles by sputtering onto a nitrile functionalised ionic liquid

H. Wender, P. Migowski, A. F. Feil, L. F. de Oliveira, M. H. G. Prechtl, R. Leal, G. Machado, S. R. Teixeira and J. Dupont, Phys. Chem. Chem. Phys., 2011, 13, 13552
DOI: 10.1039/C1CP21406C

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