<sup>1</sup>H MAS NMR
Study of Cysteine-Coated
Gold Nanoparticles
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Abstract
<sup>1</sup>H MAS NMR experiments were performed on gold
nanoparticles
coated with l-cysteine. The experiments show that l-cysteine molecules are zwitterions and support a structural model
of cysteine forming two layers. The inner layer is composed of cysteine
molecules chemisorbed to the gold surface via the sulfur atom. The
outer layer interacts with the chemisorbed layer. The <sup>1</sup>H NMR suggests that the cysteine in the outer layer exhibits large
amplitude motion about specific carbon–carbon bonds