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Related Concept Videos

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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Related Experiment Video

Updated: Jun 5, 2026

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging
07:41

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Method for determining the elemental composition and distribution in semiconductor core-shell quantum dots.

Gilad Zorn1, Shivang R Dave, Xiaohu Gao

  • 1National ESCA and Surface Analysis Center for Biomedical Problems, University of Washington, Seattle, Washington 98195-1750, USA.

Analytical Chemistry
|January 14, 2011
PubMed
Summary
This summary is machine-generated.

We developed a new X-ray photoelectron spectroscopy (XPS) method to precisely analyze multilayer quantum dot (QD) structures. This technique accurately determined the elemental composition of CdSe/CdS/ZnS QDs, advancing nanoparticle surface science.

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Last Updated: Jun 5, 2026

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17:14

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Published on: October 23, 2014

Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Core-shell quantum dots (QDs) are widely used in biological sciences.
  • Characterizing the precise structure of multilayer nanoparticles presents analytical challenges.
  • Existing surface science techniques require novel modifications for nanoparticle analysis.

Purpose of the Study:

  • To develop and validate a precise XPS signal subtraction technique for analyzing multilayer CdSe/CdS/ZnS quantum dots.
  • To experimentally determine the elemental composition and distribution within these QDs.
  • To advance surface science methodologies for complex nanoparticle systems.

Main Methods:

  • Developed a novel XPS signal subtraction technique to resolve overlapping selenium 3s and sulfur 2s peaks.
  • Applied a correction formula to XPS data for accurate elemental quantification.
  • Utilized time-of-flight secondary mass spectrometry (ToF-SIMS) for surface composition analysis.

Main Results:

  • Successfully separated overlapping Se 3s and S 2s peaks with high precision.
  • Determined a 2 nm stoichiometric CdSe core surrounded by two CdS layers and a ZnS monolayer.
  • ToF-SIMS indicated QD surfaces are primarily covered with octadecylphosphonic acid and trioctylphophine oxide.

Conclusions:

  • The developed XPS method offers enhanced precision for analyzing multilayer nanoparticles containing selenium and sulfur.
  • The study provides a detailed elemental mapping of CdSe/CdS/ZnS QDs, confirming their multilayer structure.
  • The findings represent a significant advancement in the surface science study of complex nanomaterials.