期刊
ACS SENSORS
卷 1, 期 5, 页码 493-497出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.6b00108
关键词
photonics; nanotechnology; diffraction; Bragg gratings; nanoparticles; hydrogels; diagnostics
Photonic crystals (PCs) have been traditionally produced on rigid substrates. Here, we report the development of free-standing one-dimensional (1D) slanted PC flakes. A single pulse of a 5 ns Nd:YAG laser (lambda = 532 nm, 350 mJ) was used to organize silver nanoparticles (10-50 nm) into multilayer gratings embedded in similar to 10 mu m poly(2-hydroxyethyl methacrylate-co-methacrylic acid) hydrogel films. The 1D PC flakes had narrow-band diffraction peak at similar to 510 nm. Ionization of the carboxylic acid groups in the hydrogel produced Donnan osmotic pressure and modulated the Bragg peak. In response to pH (4-7), the PC flakes shifted their diffraction wavelength from 500 to 620 nm, exhibiting 0.1 pH unit sensitivity. The color changes were visible to the eye in the entire visible spectrum. The optical characteristics of the 1D PC flakes were also analyzed by finite element method simulations. Free-standing PC flakes may have application in spray deposition of functional materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据