Tang Zilun, Wu Jianyu, Yu Xiaofeng, Hong Rui, Zu Xihong, Lin Xiaofeng, Luo Hongsheng, Lin Wenjing, Yi Guobin
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):9281-9288. doi: 10.1021/acsami.0c22785. Epub 2021 Feb 15.
In this work, Au nanoparticle (AuNP) arrays on shape memory polyurethane (SMPU) substrates serve as flexible materials for tunable localized surface plasmon resonance (LSPR). AuNP arrays prepared by diblock copolymer self-assembly are transferred from rigid silicon wafers onto flexible SMPU substrates with ultrasonic treatment rather than peeling off directly. The resultant AuNP array SMPU films have excellent mechanical properties and stable thermodynamic properties. The LSPR arising from AuNP arrays is increased by negative bending on SMPU substrates, whereas the LSPR is decreased by positive bending. Besides, upon uniaxial tension, the vertical LSPR is increased first then decreased, whereas the parallel LSPR is similar, resulting in the overall LSPR of AuNP arrays being increased first and then decreased with the mechanical uniaxial tension of SMPU. Moreover, the resultant AuNP array SMPU films exhibit excellent flexibility, stability, and homogeneity in practical surface-enhanced Raman scattering (SERS) application. This approach of incorporating AuNP arrays on SMPU substrates for tuning plasmonic properties have great potential applications in SERS, fluorescence enhancement, and newly optoelectronic materials.
在这项工作中，形状记忆聚氨酯（SMPU）基底上的金纳米颗粒（AuNP）阵列用作可调谐局域表面等离子体共振（LSPR）的柔性材料。通过二嵌段共聚物自组装制备的AuNP阵列通过超声处理从刚性硅片转移到柔性SMPU基底上，而不是直接剥离。所得的AuNP阵列SMPU薄膜具有优异的机械性能和稳定的热力学性能。SMPU基底上的负弯曲会增加AuNP阵列产生的LSPR，而正弯曲会降低LSPR。此外，在单轴拉伸时，垂直LSPR先增加后降低，而平行LSPR则相似，导致AuNP阵列的整体LSPR随着SMPU的机械单轴拉伸先增加后降低。此外，所得的AuNP阵列SMPU薄膜在实际的表面增强拉曼散射（SERS）应用中表现出优异的柔韧性、稳定性和均匀性。这种在SMPU基底上结合AuNP阵列以调节等离子体性质的方法在SERS、荧光增强和新型光电子材料方面具有巨大的潜在应用。
