Isolation of a 300 kDa, Au ∼1400 Gold Compound, the Standard 3.6 nm Capstone to a Series of Plasmonic Nanocrystals Protected by Aliphatic-like Thiolates

Chanaka Kumara, M. Mozammel Hoque, Xiaobing Zuo, David A. Cullen, Robert L. Whetten, Amala Dass

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Disclosed herein is a method to obtain the ∼300 kDa gold-hexanethiolate compound, extracted from the Faradaurate series of smaller (3) and larger (1) homologues, thereby permitting the first measurement of its distinctive properties by methods including mass spectrometry, optical spectroscopy, electron microscopy, X-ray scattering, and diffraction. The results suggest a monocrystalline metallic core (free of twinning planes) of ∼3.1 nm minimum dimension, which supports a clear plasmonic optical response, along with a diffuse exterior shell. An idealized model to account for this (and smaller) members of the series is proposed based on the completion of a convex core of regular truncated-octahedral (TO) morphology, that is, the TO (5,5) crystallite comprising 1289 sites. The diffuse layer may comprise the 240 S sites (thiolate sulfur headgroups) and 96 Au-adatom sites, giving a total composition (1385,240) and a molar mass of ∼301.0 kDa (90.7% Au). The ∼300 and ∼400 kDa gold compounds contain Au ∼1400 and Au ∼2000 atoms, respectively.

Original languageEnglish (US)
Pages (from-to)6825-6832
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume9
Issue number23
DOIs
StatePublished - Dec 6 2018
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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