School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Department of Chemistry, University of California, Riverside, CA, 92521, USA.
Sci Rep. 2017 May 10;7(1):1676. doi: 10.1038/s41598-017-01928-5.
A novel pressure-responsive polymer composite film was developed based on Ag@Au composite nanoplates (NPLs) and polyvinylpyrrolidone (PVP) by using Au nanoparticles as concentration reference. The orientation change of Ag@Au NPLs is impelled by the deformation of polymer matrix under pressure, resulting in its localized surface plasmon resonance (LSPR) intensity change of in-plane dipolar peak. The intensity ratio between plasmon peak of Au nanoparticles and in-plane dipolar peak of Ag@Au NPLs relies on the intensity and duration of pressure. By adjusting the viscosity of the polymer, the orientation change of LSPR may respond to a wide range of stresses. This pressure sensitive film can be utilized to record the magnitude and distribution of pressure between two contacting surfaces via optical information.
一种新型压力响应聚合物复合膜是基于 Ag@Au 复合纳米盘（NPLs）和聚乙烯吡咯烷酮（PVP）通过使用金纳米粒子作为浓度参考开发的。聚合物基体在压力下的变形促使 Ag@Au NPLs 的取向发生变化，导致其局域表面等离子体共振（LSPR）强度的面内偶极峰发生变化。金纳米粒子的等离子体峰与 Ag@Au NPLs 的面内偶极峰之间的强度比取决于压力的强度和持续时间。通过调整聚合物的粘度，LSPR 的取向变化可以响应大范围的应力。这种压力敏感膜可以通过光学信息来记录两个接触表面之间的压力大小和分布。
