The imaging mechanism, imaging depth, and parameters influencing the visibility of carbon nanotubes in a polymer matrix using an SEM
Visualization of embedded carbon nanotubes (CNTs) in polymer using a scanning electron microscope (SEM) has been established as a convenient technique to evaluate CNT dispersion. This technique is known as voltage contrast imaging and is different from material contrast and topographic contrast imag...
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| Veröffentlicht in: | Carbon (New York) 2011-05, Vol.49 (6), p.1955-1964 |
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| container_end_page | 1964 |
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| container_issue | 6 |
| container_start_page | 1955 |
| container_title | Carbon (New York) |
| container_volume | 49 |
| creator | Li, Wenjing Buschhorn, Samuel T. Schulte, Karl Bauhofer, Wolfgang |
| description | Visualization of embedded carbon nanotubes (CNTs) in polymer using a scanning electron microscope (SEM) has been established as a convenient technique to evaluate CNT dispersion. This technique is known as voltage contrast imaging and is different from material contrast and topographic contrast imaging. By investigating CNT/epoxy composites the voltage contrast imaging theory is further understood. Trapping of electrons at the CNT/epoxy interface induces a local potential difference which enhances the image contrast. By coating the composite with a polymer film of different thicknesses the imaging depth (i.e. from how deep the CNTs can be seen) is determined to be up to 250
nm, and is a function of the accelerating voltage of the SEM. Visibility of CNTs is found to be sensitive to the CNT dispersion and concentration, as well as to the accelerating voltage. |
| doi_str_mv | 10.1016/j.carbon.2010.12.069 |
| format | Article |
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nm, and is a function of the accelerating voltage of the SEM. 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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Carbon Carbon nanotubes Chemistry Cross-disciplinary physics: materials science rheology Dispersions Electric potential Exact sciences and technology Fullerenes and related materials diamonds, graphite General and physical chemistry Imaging Materials science Physics Polymer matrix composites Scanning electron microscopy Specific materials Surface physical chemistry Visibility Voltage |
| title | The imaging mechanism, imaging depth, and parameters influencing the visibility of carbon nanotubes in a polymer matrix using an SEM |
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