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Issue 40, 2006
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Crystal structure dependence of the elastic constants of gold nanorods

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Abstract

Time-resolved spectroscopy has been used to examine the elastic properties of single crystal gold nanorods with a [100] growth direction. These rods were produce by seed-mediated growth in the presence of silver ions, using both chemical and photochemical reduction. Analysis of the experimental data yields a value of Young's modulus for the nanorods of ENR = 31 ± 1 GPa. This is approximately 26% smaller than the value for bulk gold of E[100] = 42 GPa. The reduction in the size of Young's modulus is consistent with our previous studies of penta-twinned, [110] growth direction nanorods, where we found ENR = 64 ± 2 GPa compared to E[110] = 81 GPa for bulk gold. The fact that both the single crystal and the penta-twinned nanorods show a similar reduction in E compared to the bulk values (20%–30%) shows that this effect does not arise from the presence of twin planes in the nanorods. Our data show a weak correlation between the measured values of ENR for the [100] nanorods and the surface-to-volume ratio of the rods. The larger value of Young's modulus at small size is possibly due to defect elimination. These results underscore the importance of growth direction in determining the elastic properties of nanorods and nanowires.

Graphical abstract: Crystal structure dependence of the elastic constants of gold nanorods

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Publication details

The article was received on 24 May 2006, accepted on 20 Jul 2006 and first published on 07 Aug 2006


Article type: Paper
DOI: 10.1039/B607364F
Citation: J. Mater. Chem., 2006,16, 3957-3963
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    Crystal structure dependence of the elastic constants of gold nanorods

    H. Petrova, J. Perez-Juste, Z. Zhang, J. Zhang, T. Kosel and G. V. Hartland, J. Mater. Chem., 2006, 16, 3957
    DOI: 10.1039/B607364F

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