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Visualizing the size, shape, morphology, and localized surface plasmon resonance of individual gold nanoshells by near-infrared multispectral imaging microscopy.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mejač, Irena Bryan, William W. Lee, T. Randall Tran, Chieu D. |
| Copyright Year | 2009 |
| Abstract | We have successfully utilized the newly developed near-infrared multispectral imaging (NIR-MSI) microscope to observe and measure directly the localized surface plasmon absorption (LSPR) of individual gold nanoshells. The NIR-MSI is suited for this task because it can simultaneously record spectral and spatial information of a sample with high sensitivity (single pixel resolution) and high spatial resolution (approximately 0.9 microm/pixel). Importantly, the LSPR of individual nanoshells measured by the NIR-MSI microscope agrees well with the spectra calculated theoretically using Mie scattering for the nanoshells (i.e., nanoshells with silica cores approximately 800 nm in diameter and gold shell thicknesses of approximately 35 nm). Additionally, the NIR-MSI microscope enables measurement of LSPR at different positions within a single nanoshell. LSPR spectra were found to be distinct at various positions within a single nanoshell. Since LSPR spectra are known to depend on the shape and morphology of the nanoshells, these results seem to suggest that the individual nanoshells are not smooth and well-defined, but are rather rough and inhomogeneous. The LSPR spectra of single nanoshells in several different solvents were also examined using NIR-MSI and were found to depend on the dielectric constant of the medium. However, the relationship was discovered to be more complex than simply following the Drude equation. Specifically, when (lambda(max)/fwhm)(2) values of LSPR for single gold nanoshells were plotted as a function of 2n(2) (or 2epsilon) for nanoshells in six different solvents, a linear relationship was found for only three solvents: D(2)O, acetonitrile-d(3), and ethyl acetate. Acetone-d(6) showed a slight deviation, whereas formamide and pyridine-d(5) exhibited distinctly different correlations. |
| Starting Page | 266 |
| Ending Page | 268 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://lee.chem.uh.edu/2009/Analytical%20Chemistry%20%20(2009),%2081(16),%206687.pdf |
| Alternate Webpage(s) | http://www2.mu.edu/chem/tran/documents/127.pdf |
| PubMed reference number | 19618908v1 |
| Alternate Webpage(s) | https://doi.org/10.1021/ac9007495 |
| DOI | 10.1021/ac9007495 |
| Journal | Analytical chemistry |
| Volume Number | 81 |
| Issue Number | 16 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Acetone Acetone:MRat:24H:Urine:Qn Acetonitrile:MCnc:Pt:Bld:Qn Anabasine Diameter (qualifier value) Formamide (substance) Hepatitis B Surface Antigens Magnetic Resonance Imaging Microscope Device Component N-methylsuccinimide Nanoshells Pyridines Silicon Dioxide Solvents Surface Plasmon Resonance ethyl acetate |
| Content Type | Text |
| Resource Type | Article |
