Abstract

Modification of structure, optical and luminescent properties of graphene oxide (GO) by laser ablation at 532 nm during various times was studied. It was shown that after 30 minutes of laser ablation, the average lateral size of GO sheets decreases from 272±120 nm to 62±29 nm. Studies of structural properties by Raman and FTIR spectroscopy and microscopy indicate the reduction and graphitization of GO at laser irradiation times greater than 20 minutes, which leads to an increase in the average crystallite size of sp² carbon domains and a decrease in the number of GO layers in the resulting particles. The optical density of the resulting GO solutions and the intensity of their fluorescence are also time dependent. After ablation, the GO fluorescence intensity increased by 10, 25, and 36% for 10, 20 and 30 minutes, respectively. In the long-lived luminescence spectrum of GO, a broad emission band was recorded after ablation, whereas for GO before ablation long-lived luminescence was not exhibited.

摘要

研究了在不同时间通过 532 nm 激光烧蚀对氧化石墨烯 (GO) 的结构、光学和发光性质的改性。结果表明，激光烧蚀 30 分钟后，GO 片的平均横向尺寸从 272±120 nm 减小到 62±29 nm。通过拉曼和 FTIR 光谱和显微镜对结构特性的研究表明，在激光照射时间大于 20 分钟时 GO 的还原和石墨化，这导致 sp ^{2的平均微晶尺寸增加}碳域和所得颗粒中GO层数的减少。所得 GO 溶液的光密度及其荧光强度也与时间有关。消融后，GO 荧光强度在 10、20 和 30 分钟内分别增加了 10、25 和 36%。在 GO 的长寿命发光光谱中，烧蚀后记录了宽的发射带，而烧蚀前的 GO 没有显示出长寿命发光。