Fedorenko Viktoriia, Viter Roman, Mrówczyński Radosław, Damberga Daina, Coy Emerson, Iatsunskyi Igor
Institute of Atomic Physics and Spectroscopy, University of Latvia Jelgavas 3 Riga LV-1004 Latvia
Center for Collective Use of Scientific Equipment, Sumy State University 31, Sanatornaya St. 40018 Sumy Ukraine.
RSC Adv. 2020 Aug 12;10(50):29751-29758. doi: 10.1039/d0ra04829a. eCollection 2020 Aug 10.
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) 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.
在本工作中，我们报道了氧化锌与聚多巴胺（ZnO/PDA）界面处过程的建模。通过化学浴沉积法将聚多巴胺层沉积到氧化锌纳米棒（NRs）上。计算并分析了聚多巴胺沉积前后氧化锌中的缺陷浓度。通过透射电子显微镜（TEM）、X射线衍射（XRD）、拉曼光谱和傅里叶变换红外（FTIR）光谱、光致发光（PL）测量以及漫反射光谱对ZnONRs/PDA核壳纳米结构进行了研究。TEM和电子能量损失谱（EELS）测量证实了聚多巴胺的保形涂层，而ZnO和ZnONRs/PDA样品的PL发射在聚多巴胺沉积后强度降低。参与PL和量子效率的缺陷浓度降低解释了PL的降低。最后，观察到的活化能降低和PL峰的位移归因于聚多巴胺和氧化锌纳米结构之间形成了额外的局部电场。
