Growing gold nanoparticles on a flexible substrate to enable simple mechanical control of their plasmonic coupling

Article Article scientifique Article Growing gold nanoparticles on a flexible substrate to enable simple mechanical control of their plasmonic coupling eng 2014 author Cataldi Ugo 789108 author Caputo Roberto author Kurylyak Yuriy author Klein Gérard 763176 author Chekini Mahshid 744202 author Umeton Cesare author Buergi Thomas 727741 7927 10.1039/C4TC01607F 2050-7526 http://xlink.rsc.org/?DOI=C4TC01607F A simple method is presented to control and trigger the coupling between plasmonic particles using both a growing process of gold nanoparticles (GNPs) and a mechanical strain applied to the elastomeric template where these GNPs are anchored. The large scale samples are prepared by first depositing and then further growing gold nanoparticles on a flexible PDMS tape. Upon stretching the tape the particles move further apart in the direction of the stretching and closer together in the direction perpendicular to it. The synergy between the controlled growth of GNPs and the mechanical strain, leads to a drastic shift of the plasmon band and a color change of the sample. Furthermore, the stretching by only a few percent of the amorphous and initially isotropic sample results in a strong polarization-dependent plasmon shift. At smaller gap sizes between neighboring particles, induced by stretching the PDMS tape, the plasmon shift strongly deviates from the behaviour expected considering the plasmon ruler equation. This shows that multipolar coupling effects significantly contribute to the observed shift. Overall, these results indicate that a macroscopic mechanical strain allows one to control the coupling and therefore the electromagnetic field at the nanoscale. Dewey 540 38 Département de chimie physique 142 false 694 Groupe Bürgi Journal of materials chemistry. C 2 37 26275c55-a697-4537-9572-9a47bc421768 Article (Published version) Restricted ref01565.pdf 887009 application/pdf restrictedAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

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Growing gold nanoparticles on a flexible substrate to enable simple mechanical control of their plasmonic coupling	Journal of materials chemistry. C			2014	557	1

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Klein, Gérard