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Determining surface chemical composition of silver nanoparticles during sulfidation by monitoring the ligand shell

  • John M. PettiboneEmail author
  • Justin M. GorhamEmail author
  • Jingyu Liu
Research Paper
  • 87 Downloads

Abstract

Evaluating the surface and core compositions of transforming nanoparticles (NP) represents a significant measurement challenge but is necessary for predicting performance in applied systems and their toxicity in natural environments. Here, we use X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy to characterize both the surface and core of polyvinyl pyrollidone-silver nanoparticles in the presence of two Suwannee River fulvic acid (FA) standards and humic acid (HA) during sulfidation, the predominant transformation pathway in environmental systems. Only by using data from both spectroscopic methods was a clear relationship established between AgNP core composition and FA affinity established, where concomitant loss of FA was observed with Ag2S formation. Using XPS to measure AgNP surface composition, overlapping trends from XPS on FA I desorption from the AgNP surface as function of surface sulfidation were observed with FA II in the ATR-FTIR measurements. The reproducibility of the changing heterogeneous coating as a function of AgNP sulfidation provided a transferable method to determine the extent of Ag sulfidation without further need for the high resolution, high cost measurement tools that underpinned validation of the method. The relationship was not observed for HA, where a lower affinity to the AgNP surface was observed, suggesting distinct binding to the NP.

Graphical abstract

Keywords

Transformation Spectroscopy Natural organic matter Transferable methods Surface nanoscience 

Notes

Acknowledgements

The authors thank Aaron Johnston-Peck for performing the TEM.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11051_2018_4410_MOESM1_ESM.docx (4.2 mb)
ESM 1 (DOCX 4274 kb)

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2018

Authors and Affiliations

  1. 1.Material Measurement Science DivisionNational Institute of Standards and TechnologyGaithersburgUSA

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