pH sensor based on upconverting luminescent lanthanide nanorods

Li-Ning Sun; Hongshang Peng; Matthias I. J. Stich; Daniela Achatz; Otto S. Wolfbeis

doi:10.1039/B907822C

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pH sensor based on upconverting luminescent lanthanide nanorods†

Li-Ning Sun,^a Hongshang Peng,^a Matthias I. J. Stich,^a Daniela Achatz^a and Otto S. Wolfbeis*^a

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* Corresponding authors

^a Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany
E-mail: Otto.Wolfbeis@chemie.uni-r.de
Fax: +49-941-943-4064

Abstract

The pH sensor exploits the phenomenon of upconversion luminescence and is based on a hydrogel matrix containing (a) nanorods of the NaYF₄:Er,Yb type that can be excited with 980-nm laser light to give a green and red (dual) emission, and (b) a longwave absorbing pH probe that causes a pH-dependent inner filter effect.

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Supplementary files

Experimental details. Fig. S1: Cross section of the hydrogel-based film used for sensing pH. Fig. S2: Emission spectra of the system BTB and NaYF₄:Er,Yb in solution at various pH values. Fig. S3:pH-dependent up conversion luminescence intensity at 548 and at 658nm of the sensor film upon diode laser excitation at 980 nm. Fig.S4: Absorption spectra of the sensor membrane at pH values between4 and 10. Fig. S5: Repetitive cycling of the sensor membrane between pH 10 and pH 6 by monitoring the luminescent intensity at 654 nm PDF (167K)

Article information

DOI: https://doi.org/10.1039/B907822C
Article type: Communication
Submitted: 20 Apr 2009
Accepted: 19 Jun 2009
First published: 13 Jul 2009

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Chem. Commun., 2009, 5000-5002

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pH sensor based on upconverting luminescent lanthanide nanorods

L. Sun, H. Peng, M. I. J. Stich, D. Achatz and O. S. Wolfbeis, Chem. Commun., 2009, 5000 DOI: 10.1039/B907822C

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Chemical Communications

pH sensor based on upconverting luminescent lanthanide nanorods†

Abstract

Supplementary files

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pH sensor based on upconverting luminescent lanthanide nanorods

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