XPS Examination of the Chemical Composition of PEGMUA‐Coated Gold Nanoparticles
Source abstract
Abstract
Abstract A surface chemical analysis of 12 nm diameter gold nanoparticles (AuNPs) coated with polyethylene glycol (PEG)‐11‐mercaptoundecanoic acid (MUA) is performed by means of X‐ray photoelectron spectroscopy (XPS). For this purpose, the PEGMUA‐coated AuNPs are deposited using two different deposition techniques, drop‐casting or spin‐coating, on a thin‐film carbon substrate. The measurements show that AuNPs are present in the +I oxidation state due to the synthesis process of the coated AuNPs, and in the Au(0) oxidation state. Carbon and oxygen contaminations are detected on both the coating surface and carbon substrate. While sputtering of the sample with argon enables the removal of carbon and oxygen contaminations, it also removes part of the coating on the sample surface. The two deposition methods, however, do not cause any chemical structural changes to the nanoparticles.
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Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Catalytic Processes in Materials Science · Electron and X-Ray Spectroscopy Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Physikalisch‐Technische Bundesanstalt (PTB) Bundesallee 100 38116 Braunschweig Germany
Institute of Radioecology and Radiation Protection Leibniz University Hannover Herrenhäuserstraße 2 30419 Hannover Germany
Faculty of Physics and Center for Nanointegration Duisburg‐Essen (CENIDE) University of Duisburg‐Essen Lotharstraße 1 47057 Duisburg Germany
Physikalisch‐Technische Bundesanstalt (PTB) Abbestraße 2‐12 10587 Berlin Germany
Funding
Deutsche Forschungsgemeinschaft
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