Characterizing gold nanoparticles by NMR spectroscopy

Chengchen Guo, Jeffery Yarger

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Gold nanoparticles have attracted considerable attention in recent research because of their wide applications in various fields such as material science, electrical engineering, physical science, and biomedical engineering. Researchers have developed many methods for synthesizing different kinds of gold nanoparticles, where the sizes and surface chemistry of the nanoparticles are considered to be the two key factors. Traditionally, the sizes of nanoparticles are determined by electron microscopy whereas the surface chemistry is characterized by optical spectroscopies such as infrared spectroscopy and Raman spectroscopy. Compared with that, nuclear magnetic resonance (NMR) spectroscopy provides a more advanced and convenient way for size determination and surface chemistry investigations by combining one- and multiple-dimensional NMR spectroscopy and diffusion-order NMR spectroscopy. Here, we show a thorough study that NMR spectroscopy can be applied to characterize small thiol-protected gold nanoparticles, including size determination, surface chemistry investigation, and structural study. The results show that the nanoparticles' sizes determined by NMR agree well with transmission electron microscopy results. Furthermore, the ligand densities of nanoparticles were determined by quantitative NMR spectroscopy, and the structures of ligands capped on the surfaces were studied thoroughly by one- and multiple-dimensional NMR spectroscopy. In this work, we establish a general method for researchers to characterize nanostructures by using NMR spectroscopy.

Original languageEnglish (US)
Pages (from-to)1074-1082
Number of pages9
JournalMagnetic Resonance in Chemistry
Volume56
Issue number11
DOIs
StatePublished - Nov 1 2018

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Gold
Nuclear magnetic resonance spectroscopy
Nanoparticles
Surface chemistry
Size determination
Ligands
Biomedical engineering
Electrical engineering
Materials science
Sulfhydryl Compounds
Electron microscopy
Raman spectroscopy
Infrared spectroscopy
Nanostructures
Nuclear magnetic resonance
Transmission electron microscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Characterizing gold nanoparticles by NMR spectroscopy. / Guo, Chengchen; Yarger, Jeffery.

In: Magnetic Resonance in Chemistry, Vol. 56, No. 11, 01.11.2018, p. 1074-1082.

Research output: Contribution to journalArticle

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