Abstract Metallic nanoparticles loaded graphene nanocomposites have been widely studied for various scientific and technological applications. In this study, a facile method was reported to realize a straightforward growth of shape and size-controllable of metallic nanoparticles, and the subsequent hybridization with graphene in solution by strategically coupling wet-chemical route and laser ablation. By mixing graphene oxide (GO) with a tunable concentration level of polyvinylpyrrolidone (PVP) in aqueous solution, Ag nanocubes with a face-centered cubic crystal structure were generated by pulsed laser ablation and then mounted on GO nanosheets with the assistance of PVP. The preferential adsorption of PVP to Ag (100) crystal face led to the production of Ag nanocubes with exposed (100) facet. The result showed that the morphological yield of spherical particles decreased with the increase in PVP concentration. X-ray diffraction (XRD) and UV–visible spectroscopy analyses confirmed that GO was partially reduced. In the reduction of CO2 gas, the photocatalytic conversion rate could achieve 133.1 μmol g−1 h−1 in 6 hrs for cubic Ag-loaded reduced GO composites.

中文翻译：

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PVP 辅助激光烧蚀生长固定在还原氧化石墨烯 (rGO) 上的银纳米立方体，以实现高效的光催化 CO2 还原

摘要 载有金属纳米颗粒的石墨烯纳米复合材料已被广泛研究用于各种科学和技术应用。在这项研究中，报道了一种简便的方法来实现金属纳米颗粒形状和尺寸可控的直接生长，以及随后通过湿化学路线和激光烧蚀策略性耦合在溶液中与石墨烯的杂交。通过在水溶液中混合氧化石墨烯 (GO) 和可调浓度的聚乙烯吡咯烷酮 (PVP)，脉冲激光烧蚀产生具有面心立方晶体结构的 Ag 纳米立方体，然后在 PVP 的帮助下安装在 GO 纳米片上。PVP 优先吸附到 Ag (100) 晶面导致产生具有暴露 (100) 晶面的 Ag 纳米立方体。结果表明，球形颗粒的形态产率随着PVP浓度的增加而降低。X 射线衍射 (XRD) 和紫外-可见光谱分析证实 GO 被部分还原。在CO2气体的还原中，立方Ag负载还原GO复合材料的光催化转化率可以在6小时内达到133.1 μmol g-1 h-1。