Effect of temperature on photoluminescence of CdSe/ZnS quantum dots in biopolymer composite with erythrosine B

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Resumo

The temperature sensitivity of photoluminescence of synthesized composites based on differently charged biopolymers with colloidal CdSe/ZnS quantum dots and erythrosin B dye was studied. Due to the combined action of the mechanisms of temperature quenching and resonant energy transfer from quantum dots to the dye, the dynamic range of the analytical signal of the quantum dot photoluminescence intensity increases, which can be used to create dynamic temperature sensors.

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Sobre autores

N. Slyusarenko

Siberian Federal University

Autor responsável pela correspondência
Email: sci_box@mail.ru
Rússia, Krasnoyarsk

M. Gerasimova

Siberian Federal University

Email: sci_box@mail.ru
Rússia, Krasnoyarsk

E. Parfenova

Siberian Federal University

Email: sci_box@mail.ru
Rússia, Krasnoyarsk

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2. Fig. 1. Structural formulae of CdSe/ZnS quantum dots (a), erythrosine B dye (b) and biopolymers: chitosan (c) and chondroitin sulphate (d)

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3. Fig. 2. Normalised absorption and PL spectra of CdSe/ZnS quantum dots (1, 2) and erythrosine B dye (3, 4) in composite (a). PL spectra and PL attenuation curves (inset) of CdSe/ZnS in composite without (1) and with energy acceptor (2) (b)

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4. Fig. 3. Effect of temperature on the spectra and FL attenuation curves of CdSe/ZnS quantum dots in water (a, d), in biopolymer composite without (b, e) and with (c, f) energy acceptor. T = 283 K (1, black curves), T = 293 K (2, red curves), T = 303 K (3, green curves), T = 313 K (4, blue curves), T = 323 K (5, blue curves), T = 333 K (6, violet curves)

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5. Fig. 4. Effect of temperature on the decrease of the size of biopolymer particles (1), composite with erythrosine B (2) and on the increase of the contribution from the total energy transfer of CT-CT, CT-erB (3) and energy transfer only due to CT-erB (4) to the quenching of the FL intensity (a). Temperature quenching of PL intensity (I) and mean lifetime (τ) of CdSe/ZnS quantum dots in three investigated systems (b): water (black circles, 1 - I, 2 - τ), composite (green triangles, 3 - I, 4 - τ), composite with erB (red squares, 5 - I, 6 - τ)

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