Huang Dali, Zeng Minxiang, Wang Ling, Zhang Lecheng, Cheng Zhengdong
Department of Materials Science & Engineering, Texas A&M University College Station Texas 77843 USA
Artie McFerrin Department of Chemical Engineering, Texas A&M University College Station Texas 77843 USA.
RSC Adv. 2018 Oct 10;8(61):34839-34847. doi: 10.1039/c8ra07158f.
Biomimetic nanostructured materials with iridescent structural colors have attracted great attention due to their potential in photonic devices, materials science, and biomedical engineering. The technological applications of artificial photonic crystals (PCs), however, are often hindered by their low color visibility. Herein, we report colloidal PCs with enhanced color visibility through the coassembly of thioglycerol-modified graphene quantum dots (GQDs) into the close-packed array of polystyrene (PS) nanospheres. The enhanced polystyrene PCs were fabricated by both centrifugal sedimentation and drop-casting methods. The color visibility of the resulting PCs was found to be strongly dependent on the hydrothermal time (, carbonization) and the doping concentrations of GQDs. The PCs with brilliant reflection colors with red, green and blue (RGB) regions have been achieved by controlling the size of the constituent PS nanoparticles. As a proof of concept for photonic ink applications, we demonstrated a number of photonic images with RGB colors on multiple substrates including paper, silicon wafer and glass. This work is expected to provide new insight into the development of emerging advanced photonic crystals with high color visibility for applications such as colloidal paints, textile fabrics, and wearable displays.
具有虹彩结构颜色的仿生纳米结构材料因其在光子器件、材料科学和生物医学工程中的潜力而备受关注。然而，人工光子晶体（PCs）的技术应用常常因其低颜色可见度而受到阻碍。在此，我们报道了通过将硫代甘油修饰的石墨烯量子点（GQDs）共组装到聚苯乙烯（PS）纳米球的密排阵列中而具有增强颜色可见度的胶体PCs。通过离心沉降和滴铸法制备了增强型聚苯乙烯PCs。发现所得PCs的颜色可见度强烈依赖于水热时间（即碳化）和GQDs的掺杂浓度。通过控制组成PS纳米颗粒的尺寸，已经实现了具有红色、绿色和蓝色（RGB）区域的明亮反射颜色的PCs。作为光子墨水应用的概念验证，我们在包括纸张、硅片和玻璃在内的多种基材上展示了许多具有RGB颜色的光子图像。这项工作有望为开发具有高颜色可见度的新型先进光子晶体提供新的见解，用于胶体涂料、纺织织物和可穿戴显示器等应用。
