ArticleAnalytical chemistry2016
Quantifying the Impact of Nanoparticle Coatings and Nonuniformities on XPS Analysis: Gold/Silver Core-Shell Nanoparticles.
Article in Analytical chemistry, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- Click-Ready Gold Nanoparticles from Aqueous Mechanochemistry: 2-Propynylamine as a Reducing Agent and Surface Ligand.Materials (Basel, Switzerland) · 2025Article
- Ultrasensitive detection of circulating tumor DNA using a CRISPR/Cas9 nickase-driven 3D DNA walker based on a COF-AuNPs sensing platform.Mikrochimica acta · 2024Article
- Composition, thickness, and homogeneity of the coating of core-shell nanoparticles-possibilities, limits, and challenges of X-ray photoelectron spectroscopy.Analytical and bioanalytical chemistry · 2022Review
- Analyzing the surface of functional nanomaterials-how to quantify the total and derivatizable number of functional groups and ligands.Mikrochimica acta · 2021Review
- Combining HR-TEM and XPS to elucidate the core-shell structure of ultrabright CdSe/CdS semiconductor quantum dots.Scientific reports · 2020Article
- Surface analysis tools for characterizing biological materials.Chemical Society reviews · 2020Review
- All that is silver is not toxic: silver ion and particle kinetics reveals the role of silver ion aging and dosimetry on the toxicity of silver nanoparticles.Particle and fibre toxicology · 2018Article
- Comparisons of Analytical Approaches for Determining Shell Thicknesses of Core-Shell Nanoparticles by X-ray Photoelectron Spectroscopy.The journal of physical chemistry. C, Nanomaterials and interfaces · 2018Article
- The Chameleon Effect: Characterization Challenges Due to the Variability of Nanoparticles and Their Surfaces.Frontiers in chemistry · 2018Article
- Differential effects of silver nanoparticles on DNA damage and DNA repair gene expression in Ogg1-deficient and wild type mice.Nanotoxicology · 2017Article
- Biomedical surface analysis: Evolution and future directions (Review).Biointerphases · 2017Review
- Multitechnique characterization of oligo(ethylene glycol) functionalized gold nanoparticles.Biointerphases · 2016Article
- Provenance information as a tool for addressing engineered nanoparticle reproducibility challenges.Biointerphases · 2016Article
- Evaluation of Two Methods for Determining Shell Thicknesses of Core-Shell Nanoparticles by X-ray Photoelectron Spectroscopy.The journal of physical chemistry. C, Nanomaterials and interfaces · 2016Article
- Use of XPS to Quantify Thickness of Coatings on Nanoparticles.Microscopy today · 2016Article
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Authors and funding
4 authors.
Funding
Abstract
Spectral modeling of photoelectrons can serve as a valuable tool when combined with X-ray photoelectron spectroscopy (XPS) analysis. Herein, a new version of the NIST Simulation of Electron Spectra for Surface Analysis (SESSA 2.0) software, capable of directly simulating spherical multilayer NPs, was applied to model citrate stabilized Au/Ag-core/shell nanoparticles (NPs). The NPs were characterized using XPS and scanning transmission electron microscopy (STEM) to determine the composition and morphology of the NPs. The Au/Ag-core/shell NPs were observed to be polydispersed in size, nonspherical, and contain off-centered Au-cores. Using the average NP dimensions determined from STEM analysis, SESSA spectral modeling indicated that washed Au/Ag-core-shell NPs were stabilized with a 0.8 nm layer of sodium citrate and a 0.05 nm (one wash) or 0.025 nm (two wash) layer of adventitious hydrocarbon, but did not fully account for the observed XPS signal from the Au-core. This was addressed by a series of simulations and normalizations to account for contributions of NP nonsphericity and off-centered Au-cores. Both of these nonuniformities reduce the effective Ag-shell thickness, which effect the Au-core photoelectron intensity. The off-centered cores had the greatest impact for the particles in this study. When the contributions from the geometrical nonuniformities are included in the simulations, the SESSA generated elemental compositions that matched the XPS elemental compositions. This work demonstrates how spectral modeling software such as SESSA, when combined with experimental XPS and STEM measurements, advances the ability to quantitatively assess overlayer thicknesses for multilayer core-shell NPs and deal with complex, nonideal geometrical properties.
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