pH sensor based on upconverting luminescent lanthanide nanorods.
The pH sensor exploits the phenomenon of upconversion luminescence and is based on a hydrogel matrix containing (a) nanorods of the NaYF(4):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.
Sun
Li-Ning
LN
Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany.
Peng
Hongshang
H
Stich
Matthias I J
MI
Achatz
Daniela
D
Wolfbeis
Otto S
OS