Photonic Crystal Beads from Gravity-Driven Microfluidics

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• 作者：Hongcheng Gu ; Fei Rong ; Baocheng Tang ; Yuanjin Zhao ; Degang Fu ; Zhongze Gu
• 刊名：Langmuir
• 出版年：2013
• 出版时间：June 25, 2013
• 年：2013
• 卷：29
• 期：25
• 页码：7576-7582
• 全文大小：460K
• 年卷期：v.29,no.25(June 25, 2013)
• ISSN：1520-5827

文摘

This Letter reports a simple method for the mass production of 3D colloidal photonic crystal beads (PCBs) by using a gravity-driven microfluidic device and online droplet drying method. Compared to traditional methods, the droplet templates of the PCBs are generated by using the ultrastable gravity as the driving force for the microfluidics, thus the PCBs are formed with minimal polydispersity. Moreover, drying of the droplet templates is integrated into the production process, and the nanoparticles in the droplets self-assemble online. Overall, this process results in PCBs with good morphology, low polydispersity, brilliant structural colors, and narrow stop bands. PCBs could be bulk generated by this process for many practical applications, such as multiplex-encoded assays and the construction of novel optical materials.