Wang Jia-Wei, Wu Xingjiang, Yu Xiao-Qing, Guo Min, Zhao Jin, Zhu Liangliang, Chen Su
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, P.R. China.
Nanoscale. 2021 Oct 8;13(38):16189-16196. doi: 10.1039/d1nr03953a.
Colloidal photonic crystals (CPCs) with a highly ordered crystal structure have attracted great attention in displays, colorimetric sensors and solar energy utilization fields. However, the easily cracking microstructure, inferior assembly efficiency and low refractive index contrast result in poor structural colors. Herein, we develop core-shell poly(styrene-acrylic)@polypyrrole (P(St-AA)@PPy) colloidal nanoparticles by the chemical coupling reaction droplet microfluidic technology. By membrane separation-assisted assembly (MSAA) and electrostatic spraying strategies, the P(St-AA)@PPy colloidal nanoparticles are assembled into the CPC film, which presents high assembly efficiency and saturated angle-independent structural colors, due to the light-absorbing PPy shell and hydrogen-bond interaction between nanoparticles. Benefitting from these outstanding performances, the P(St-AA)@PPy film shows excellent photothermal properties, which can realize a solar vaporization rate of 1.5825 kg m h, corresponding to a light-to-vapor efficiency of 94.20%, under 1.0 sun solar irradiance conditions. Our findings open a path for the design of functional CPCs and new-generation photothermal applications.
具有高度有序晶体结构的胶体光子晶体（CPCs）在显示、比色传感器和太阳能利用领域引起了极大关注。然而，其易于开裂的微观结构、较差的组装效率和低折射率对比度导致结构色不佳。在此，我们通过化学偶联反应液滴微流控技术制备了核壳结构的聚（苯乙烯 - 丙烯酸）@聚吡咯（P(St-AA)@PPy）胶体纳米粒子。通过膜分离辅助组装（MSAA）和静电喷涂策略，P(St-AA)@PPy胶体纳米粒子被组装成CPC薄膜，由于吸光的PPy壳层以及纳米粒子之间的氢键相互作用，该薄膜呈现出高组装效率和与角度无关的饱和结构色。受益于这些优异性能，P(St-AA)@PPy薄膜表现出出色的光热性能，在1.0个太阳光照强度条件下，其太阳能汽化速率可达1.5825 kg m h，对应的光 - 汽效率为94.20%。我们的研究结果为功能性CPCs的设计和新一代光热应用开辟了一条道路。
