Nanoparticle metrology in sol-gels using multiphoton excited fluorescence
Karolin, J. and Geddes, C.D. and Wynne, Klaas and Birch, D.J.S. (2001) Nanoparticle metrology in sol-gels using multiphoton excited fluorescence. Measurement Science and Technology, 13 (1). pp. 21-27. ISSN 0957-0233
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We have developed a method of measuring the growth of nanoparticles during sol-gel glass formation based on labelling the particle with a fluorescent dye and determining the multiphoton excited decay of fluorescence anisotropy due to Brownian rotation. Multiphoton excitation is shown to give a higher dynamic range of measurement than one-photon excitation. We illustrate the sub-nanometre resolution and stability of our approach by detecting a 0.8-1.1 nm silica particle hydrodynamic mean radius increase in a tetramethylorthosilicate sol at pH 2.3 labelled with rhodamine 6G and observed over ≈4 weeks and also with a stable silica colloid of radius 6 nm, pH 8.9, labelled with a 6-methoxyquinoline-type dye.
| Creators(s): |
Karolin, J., Geddes, C.D., Wynne, Klaas  ORCID: https://orcid.org/0000-0002-5305-5940 and Birch, D.J.S. ORCID: https://orcid.org/0000-0001-6400-1270;
| Item type: | Article |
|---|---|
| ID code: | 2908 |
| Keywords: | particle metrology, fluorescence anisotropy decay, multiphoton excitation, sol-gel, TMOS, nanoscience, Solid state physics. Nanoscience, Instrumentation, Applied Mathematics |
| Subjects: | Science > Physics > Solid state physics. Nanoscience |
| Department: | Faculty of Science > Physics |
| Depositing user: | Strathprints Administrator |
| Date deposited: | 15 Feb 2007 |
| Last modified: | 01 Jan 2021 08:01 |
| URI: | https://strathprints.strath.ac.uk/id/eprint/2908 |
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