Ultrastructure and Surface Composition of Glutathione-Terminated Ultrasmall Silver, Gold, Platinum, and Alloyed Silver-Platinum Nanoparticles (2 nm)

被引：9

作者：

Wolff, Natalie ^{[1
]}

Loza, Kateryna ^{[1
]}

Heggen, Marc ^{[2
]}

Schaller, Torsten ^{[3
]}

Niemeyer, Felix ^{[3
]}

Bayer, Peter ^{[4
]}

Beuck, Christine ^{[4
]}

Oliveira, Cristiano L. P. ^{[5
]}

Prymak, Oleg ^{[1
]}

Weidenthaler, Claudia ^{[6
]}

Epple, Matthias ^{[1
]}

机构：

[1] Univ Duisburg Essen, Inorgan Chem & Ctr Nanointegrat Duisburg Essen CEN, D-45117 Essen, Germany

[2] Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52428 Julich, Germany

[3] Univ Duisburg Essen, Organ Chem, D-45117 Essen, Germany

[4] Univ Duisburg Essen, Struct & Med Biochem, D-45117 Essen, Germany

[5] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, Brazil

[6] Max Planck Inst Kohlenforschung, D-45470 Mulheim, Germany

来源：

INORGANIC CHEMISTRY | 2023年 / 62卷 / 42期

基金：

巴西圣保罗研究基金会;

关键词：

CORE-SHELL NANOPARTICLES; BIMETALLIC NANOPARTICLES; SIZE; NANOCLUSTERS; REDUCTION; PRECISION; AU;

D O I：

10.1021/acs.inorgchem.3c02879

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Alloyed ultrasmall silver-platinum nanoparticles (molar ratio Ag:Pt = 50:50) were prepared and compared to pure silver, platinum, and gold nanoparticles, all with a metallic core diameter of 2 nm. They were surface-stabilized by a layer of glutathione (GSH). A comprehensive characterization by high-resolution transmission electron microscopy (HRTEM), electron diffraction (ED), X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), differential centrifugal sedimentation (DCS), and UV spectroscopy showed their size both in the dry and in the water-dispersed state (hydrodynamic diameter). Solution NMR spectroscopy (H-1, C-13, COSY, HSQC, HMBC, and DOSY) showed the nature of the glutathione shell including the number of GSH ligands on each nanoparticle (about 200 with a molecular footprint of 0.063 nm(2) each). It furthermore showed that there are at least two different positions for the GSH ligand on the gold nanoparticle surface. Platinum strongly reduced the resolution of the NMR spectra compared to silver and gold, also in the alloyed nanoparticles. X-ray photoelectron spectroscopy (XPS) showed that silver, platinum, and silver-platinum particles were at least partially oxidized to Ag(+I) and Pt(+II), whereas the gold nanoparticles showed no sign of oxidation. Platinum and gold nanoparticles were well crystalline but twinned (fcc lattice) despite the small particle size. Silver was crystalline in electron diffraction but not in X-ray diffraction. Alloyed silver-platinum nanoparticles were almost fully amorphous by both methods, indicating a considerable internal disorder.

引用

页码：17470 / 17485

页数：16