Tsai, Evaline S. and Himmelstoss, Sandy F. and Wiesholler, Lisa M. and Hirsch, Thomas and Hall, Elizabeth A. H. (2019) Upconversion nanoparticles for sensing pH. ANALYST, 144 (18). pp. 5547-5557. ISSN 0003-2654, 1364-5528
Full text not available from this repository. (Request a copy)Abstract
Upconversion nanoparticles (UCNPs) can provide a vehicle for chemical imaging by coupling chemically sensitive dyes and quenchers. The mechanism for coupling of two anthraquinone dyes, Calcium Red and Alizarin Red S, was investigated as a function of pH. The green emission band of the UCNPs was quenched by a pH-dependent inner filter effect (IFE) while the red emission band remained unchanged and acted as the reference signal for ratiometric pH measurements. Contrary to previous expectation, there was little evidence for a resonance energy transfer (RET) mechanism even when the anthraquinones were attached onto the UCNPs through electrostatic attraction. Since the UCNPs are point emitters, only emitters close to the surface of the UCNP are within the expected Forster distance and UC-RET is via IFE.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | UPCONVERTING NANOPARTICLES; ENERGY-TRANSFER; 2-PHOTON MICROSCOPY; FLUORESCENCE; LUMINESCENCE; NANOCRYSTALS; SENSORS; DESIGN; YB3+; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Mar 2020 10:48 |
| Last Modified: | 27 Mar 2020 10:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26228 |
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