Vostrikova Anna V, Prikhozhdenko Ekaterina S, Mayorova Oksana A, Goryacheva Irina Yu, Tarakina Nadezda V, Sukhorukov Gleb B, Sapelkin Andrei V
Saratov State University, 83 Astrakhanskaya Street, Saratov, 410012, Russia.
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.
Sci Rep. 2018 Jun 20;8(1):9394. doi: 10.1038/s41598-018-27488-w.
Synthesis of carbon nanodots (CNDs) in confined geometry via incorporation of dextran sulphate into pores of CaCO microparticles is demonstrated. The preparation process included three steps: co-precipitation of solutions of inorganic salts and carbon source, thermal treatment and CaCO matrix removal. We show that geometric constraints can be used to precisely control the amount of source material and to avoid formation of large carbon particles. Analysis of TEM data shows particle size of ~3.7 nm with narrow size distribution. Furthermore, we found that variation in pore morphology has a clear effect on CNDs structure and optical properties. CNDs with graphene oxide like structure were obtained in the nanoporous outer shell layer of CaCO microparticles, while less ordered CNDs with the evidence of complex disordered carbons were extracted from the inner microcavity. These results suggest that confined volume synthesis route in CaCO3 nanopores can be used to precisely control the structure and optical properties of CNDs.
通过将硫酸葡聚糖掺入碳酸钙微粒的孔中，在受限几何结构中合成碳纳米点（CNDs）得以实现。制备过程包括三个步骤：无机盐溶液与碳源的共沉淀、热处理以及碳酸钙基质的去除。我们表明，几何约束可用于精确控制源材料的量并避免形成大的碳颗粒。透射电子显微镜（TEM）数据分析显示，颗粒尺寸约为3.7纳米，尺寸分布狭窄。此外，我们发现孔形态的变化对碳纳米点的结构和光学性质有明显影响。在碳酸钙微粒的纳米多孔外壳层中获得了具有氧化石墨烯结构的碳纳米点，而从内部微腔中提取出了具有复杂无序碳迹象的无序程度较低的碳纳米点。这些结果表明，碳酸钙纳米孔中的受限体积合成路线可用于精确控制碳纳米点的结构和光学性质。
