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Synthesis and Bioactivity of RGO/TiO2-Noble Metal Nanocomposite Flakes

机译:RGO / TiO2-贵金属纳米复合片的合成及生物活性

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This study aims to describe the influence of adding graphene oxide to TiO2-noble metal (Me=Ag, Au or Pd) composite nanoparticles on their bioactivity (formation of RGO/TiO2-Me nanocomposite system). The obtained nanocomposite flakes and reference TiO2-Me nanoparticles were characterized using SEM, HRTEM and XPS spectroscopy, N-2 sorption analysis and helium pycnometer. The analysis of the antibacterial properties of synthesized nanocomposites revealed a growth inhibiting effect of TiO2-Ag particles on gram positive bacteria such as: Staphylococcus aureus, Sarcina lutea and Bacillus subtilis. In the case of nanocomposite flakes containing RGO the visible changes in bacteriostatic properties were observed, including unexpected reversal of the antimicrobial activity of silver-containing nanoparticles into the stimulation of growth of applied bacterial strains. The stimulation of growth was not observed for TiO2-Au and Pd nanoparticles deposited on the surface of RGO.
机译:这项研究旨在描述向TiO2贵金属(Me = Ag,Au或Pd)复合纳米颗粒中添加氧化石墨烯对其生物活性(RGO / TiO2-Me纳米复合体系的形成)的影响。使用SEM,HRTEM和XPS光谱,N-2吸附分析和氦比重瓶对获得的纳米复合片和参比的TiO2-Me纳米颗粒进行表征。合成纳米复合材料的抗菌性能分析表明,TiO2-Ag颗粒对革兰氏阳性细菌如金黄色葡萄球菌,黄藻和枯草芽孢杆菌具有抑制生长的作用。在含有RGO的纳米复合薄片的情况下,观察到了抑菌特性的可见变化,包括出乎意料的将含银纳米颗粒的抗菌活性逆转为刺激所用细菌菌株的生长。对于沉积在RGO表面的TiO2-Au和Pd纳米颗粒,未观察到生长的刺激。

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