Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave., West Waterloo, Ontario N2L 3G1, Canada.
Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave., West Waterloo, Ontario N2L 3G1, Canada and Multi-scale Additive Manufacturing Laboratory, University of Waterloo, 200 University Ave., West Waterloo, Ontario N2L 3G1, Canada.
Nanoscale. 2016 Apr 28;8(16):8863-77. doi: 10.1039/c6nr01148a.
In the last few years, graphene quantum dots (GQDs) have attracted the attention of many research groups for their outstanding properties, which include low toxicity, chemical stability and photoluminescence. One of the challenges of GQD synthesis is finding a single-step, cheap and sustainable approach for synthesizing these promising nanomaterials. In this study, we demonstrate that femtosecond laser ablation of graphene oxide (GO) dispersions could be employed as a facile and environmentally friendly synthesis method for GQDs. With the proper control of laser ablation parameters, such as ablation time and laser power, it is possible to produce GQDs with average sizes of 2-5 nm, emitting a blue luminescence at 410 nm. We tested the feasibility of the synthesized GQDs as materials for electronic devices by aerosol-jet printing of an ink that is a mixture of water dispersion of laser synthesized GQDs and silver nanoparticle dispersion, which resulted in lower resistivity of the final printed patterns. Preliminary results showed that femtosecond laser synthesized GQDs can be mixed with silver nanoparticle dispersion to fabricate a hybrid material, which can be employed in printing electronic devices by either printing patterns that are more conductive and/or reducing costs of the ink by decreasing the concentration of silver nanoparticles (AgNPs) in the ink.
在过去的几年中，由于其出色的性能，包括低毒性、化学稳定性和光致发光性，石墨烯量子点（GQDs）引起了许多研究小组的关注。GQD 合成的挑战之一是寻找一种单一的、廉价的和可持续的方法来合成这些有前途的纳米材料。在这项研究中，我们证明了飞秒激光烧蚀氧化石墨烯（GO）分散体可以作为一种简便且环保的 GQDs 合成方法。通过适当控制激光烧蚀参数，如烧蚀时间和激光功率，可以生产出平均尺寸为 2-5nm、在 410nm 处发出蓝色发光的 GQDs。我们通过气溶胶喷射印刷含有激光合成 GQDs 和银纳米颗粒分散体的混合物的墨水，测试了合成的 GQDs 作为电子器件材料的可行性，从而使最终印刷图案的电阻率降低。初步结果表明，飞秒激光合成的 GQDs 可以与银纳米颗粒分散体混合，制备出一种混合材料，通过印刷导电性更高的图案，或者通过降低墨水的银纳米颗粒（AgNPs）浓度来降低墨水的成本，可用于印刷电子器件。
