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. 2020 Aug 12;10(50):29751-29758.
doi: 10.1039/d0ra04829a. eCollection 2020 Aug 10.

Synthesis and photoluminescence properties of hybrid 1D core-shell structured nanocomposites based on ZnO/polydopamine

Viktoriia Fedorenko  1   2 , Roman Viter  1   2 , Radosław Mrówczyński  3 , Daina Damberga  1 , Emerson Coy  3 , Igor Iatsunskyi  3
Affiliations

Synthesis and photoluminescence properties of hybrid 1D core-shell structured nanocomposites based on ZnO/polydopamine

Viktoriia Fedorenko et al. RSC Adv. .

Abstract

In the present work, we report on the modelling of processes at the zinc oxide and polydopamine (ZnO/PDA) interface. The PDA layer was deposited onto ZnO nanorods (NRs) via chemical bath deposition. The defect concentrations in ZnO before and after PDA deposition were calculated and analysed. The ZnONRs/PDA core-shell nanostructures were studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman and Fourier-transform infrared (FTIR) spectroscopy, photoluminescence (PL) measurements, and diffuse reflectance spectroscopy. The TEM and electron energy loss spectroscopy (EELS) measurements confirmed the conformal coating of PDA, while the PL emission from ZnO and ZnONRs/PDA samples showed a reduction of intensity after the PDA deposition. The decrease of defect concentration participating in PL and quantum efficiency explains the PL reduction. Finally, the observed decrease of activation energies and a shift of the PL peaks are attributed to the formation of an additional local electrical field between the PDA and ZnO nanostructures.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. Schematic diagram of ZnONRs/PDA synthesis by combining hydrothermal method, and dopamine hydrochloride self-polymerization in alkaline aqueous solution.
Fig. 2
Fig. 2. (a) XRD spectra of ZnONRs and ZnONRs/PDA; (b) SEM image of ZnONRs.
Fig. 3
Fig. 3. TEM images of ZnONRs/PDA: (a), and (b); electron energy loss spectroscopy (EELS) analysis of ZnONRs/PDA (c).
Fig. 4
Fig. 4. (a) Raman spectra of ZnONRs, PDA and ZnONRs–PDA; (b) FTIR of ZnO and ZnO–PDA nanocomposites.
Fig. 5
Fig. 5. PL spectra of ZnONRs and ZnONRs–PDA at room temperature (a); ZnONRs (b) and ZnONRs–PDA (c) at 77 K, power dependence; deconvolution of the PL spectrum of ZnONRs–PDA (d).
Fig. 6
Fig. 6. Diagram of possible radiative and nonradiative transitions (a). The power dependences of integrated intensities for ZnO and ZnO–PDA (b).
Fig. 7
Fig. 7. Photoluminescence temperature dependence of ZnONRs (a) and ZnONRs–PDA (b).
Fig. 8
Fig. 8. Exponential approximation for activation energy calculations (a and b). The model of forming ZnO/PDA interface (c).
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