Damberga Daina, Fedorenko Viktoriia, Grundšteins Kārlis, Altundal Şahin, Šutka Andris, Ramanavičius Arunas, Coy Emerson, Mrówczyński Radosław, Iatsunskyi Igor, Viter Roman
Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, Latvia.
Research Laboratory of Functional Materials Technologies, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena 3/7, LV-1048 Riga, Latvia.
Nanomaterials (Basel). 2020 Dec 6;10(12):2438. doi: 10.3390/nano10122438.
Polydopamine (PDA) is a new biocompatible material, which has prospects in biomedical and sensor applications. Due to functional groups, it can host wide range of biomolecules. ZnO nanostructures are well known templates for optical sensors and biosensors. The combination of ZnO and PDA results in a change of optical properties of ZnO-PDA composites as a shift of photoluminescence (PL) peaks and PL quenching. However, to date, the effect of the PDA layer on fundamental properties of ZnO-PDA nanostructures has not been studied. The presented paper reports on optical and surface properties of novel ZnO-PDA nanocomposites. PDA layers were chemically synthesized on ZnO nanostructures from different solution concentrations of 0.3, 0.4, 0.5 and 0.7 mg/mL. Structure, electronic and optical properties were studied by SEM, Raman, FTIR, diffuse reflectance and photoluminescence methods. The Z-potential of the samples was evaluated in neutral pH (pH = 7.2). The response of the samples towards poly-l-lysine adsorption, as a model molecule, was studied by PL spectroscopy to evaluate the correlation between optical and surface properties. The role of the PDA concentration on fundamental properties was discussed.
聚多巴胺（PDA）是一种新型生物相容性材料，在生物医学和传感器应用方面具有广阔前景。由于其官能团，它能够容纳多种生物分子。氧化锌（ZnO）纳米结构是光学传感器和生物传感器中广为人知的模板。ZnO与PDA的结合导致ZnO - PDA复合材料的光学性质发生变化，如光致发光（PL）峰的位移和PL猝灭。然而，迄今为止，尚未研究PDA层对ZnO - PDA纳米结构基本性质的影响。本文报道了新型ZnO - PDA纳米复合材料的光学和表面性质。通过化学合成法在ZnO纳米结构上制备了浓度分别为0.3、0.4、0.5和0.7 mg/mL的不同溶液的PDA层。采用扫描电子显微镜（SEM）、拉曼光谱、傅里叶变换红外光谱（FTIR）、漫反射和光致发光方法研究了其结构、电子和光学性质。在中性pH值（pH = 7.2）下评估了样品的Z电位。通过PL光谱研究了样品对作为模型分子的聚 - L - 赖氨酸吸附的响应，以评估光学性质与表面性质之间的相关性。讨论了PDA浓度对基本性质的作用。
