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Kumara C, Zuo X, Ilavsky J, et al. Super-stable, highly monodisperse plasmonic Faradaurate-500 nanocrystals with 500 gold atoms: Au(~500)(SR)(~120). J Am Chem Soc. 2014;136(20):7410-7doi: 10.1021/ja502327a.
Kumara, C., Zuo, X., Ilavsky, J., Chapman, K. W., Cullen, D. A., & Dass, A. (2014). Super-stable, highly monodisperse plasmonic Faradaurate-500 nanocrystals with 500 gold atoms: Au(~500)(SR)(~120). Journal of the American Chemical Society, 136(20), 7410-7. https://doi.org/10.1021/ja502327a
Kumara, Chanaka, et al. "Super-stable, highly monodisperse plasmonic Faradaurate-500 nanocrystals with 500 gold atoms: Au(~500)(SR)(~120)." Journal of the American Chemical Society vol. 136,20 (2014): 7410-7. doi: https://doi.org/10.1021/ja502327a
Kumara C, Zuo X, Ilavsky J, Chapman KW, Cullen DA, Dass A. Super-stable, highly monodisperse plasmonic Faradaurate-500 nanocrystals with 500 gold atoms: Au(~500)(SR)(~120). J Am Chem Soc. 2014 May 21;136(20):7410-7. doi: 10.1021/ja502327a. Epub 2014 May 09. PMID: 24814044.
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J Am Chem Soc. 2014 May 21;136(20):7410-7. doi: 10.1021/ja502327a. Epub 2014 May 09.

Super-stable, highly monodisperse plasmonic Faradaurate-500 nanocrystals with 500 gold atoms: Au(~500)(SR)(~120).

Journal of the American Chemical Society

Chanaka Kumara, Xiaobing Zuo, Jan Ilavsky, Karena W Chapman, David A Cullen, Amala Dass

Affiliations

  1. Department of Chemistry and Biochemistry, University of Mississippi , Oxford, Mississippi 38677, United States.

PMID: 24814044 DOI: 10.1021/ja502327a

Abstract

Determining the composition of plasmonic nanoparticles is challenging due to a lack of tools to accurately quantify the number of atoms within the particle. Mass spectrometry plays a significant role in determining the nanoparticle composition at the atomic level. Significant progress has been made in understanding ultrasmall gold nanoparticles such as Au25(SR)18 and Au38(SR)24, which have Au core diameters of 0.97 and 1.3 nm, respectively. However, progress in 2-5 nm-diameter small plasmonic nanoparticles is currently impeded, partially because of the challenges in synthesizing monodisperse nanoparticles. Here, we report a plasmonic nanocrystal that is highly monodisperse, with unprecedentedly small size variability. The composition of the superstable plasmonic nanocrystals at 115 kDa was determined as Au(500±10)SR(120±3). The Au(~500) system, named Faradaurate-500, is the largest system to be characterized using high resolution electrospray (ESI) mass spectrometry. Atomic pair distribution function (PDF) data indicate that the local atomic structure is consistent with a face-centered cubic (fcc) or Marks decahedral arrangement. High resolution scanning transmission electron microscopy (STEM) images show that the diameter is 2.4 ± 0.1 nm. The size and the shape of the molecular envelope measured by small-angle X-ray scattering (SAXS) confirms the STEM and PDF analysis.

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