Funct. Mater. 2013; 20 (1): 127-132.

http://dx.doi.org/10.15407/fm20.01.127

Luminescent temperature sensor based on [Ru(bpy)3]2+ incorporated into chitosan

M.Tsvirko[1], S.Tkaczyk[2], M.Kozak[1], B.Kalota[1]

[1]Institute of Chemistry, Environmental Protection and Biotechnology, Jan Dlugosz University, 13/15 Armii Krajowej Ave., 42-200 Czestochowa, Poland
[2]Institute of Physics, Jan Dlugosz University, 13/15 Armii Krajowej Ave., 42-200 Czestochowa, Poland

Abstract: 

A novel luminescent temperature sensor using ruthenium(II)-tris(2,2´-bipyridil) ([Ru(bpy)3]2+) incorporated into chitosan polymer matrix was developed. The sensor exhibits completely reversible and stable luminescent response (λ exc = 455 nm, λ em = 605 nm), strong temperature sensitivity (–2.0 %/°C), significant luminescence intensity decrease (~10×) in the range of 25–75°C, and stable construction. Ruthenium(II) complex oxygen sensitivity was avoided by use of matrix (chitosan) with low oxygen permeability coefficient. In the absence of oxygen the sensor shows a little higher accuracy and stability of luminescence response than under oxygen conditions. Moreover, this sensor, due to biocompatibility of the used ingredients and the emission in the red VIS-region, which is transparent for tissues, is promising for use in biological applications.

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