Centro de Tecnologías Físicas, Unidad Asociada ICMM/CSIC-UPV, Universidad Politécnica de Valencia, Av, Los Naranjos s/n, Valencia, 46022, Spain.
Nanoscale Res Lett. 2012 Sep 3;7(1):497. doi: 10.1186/1556-276X-7-497.
We have recently developed a new type of porous silicon we name as porous silicon colloids. They consist of almost perfect spherical silicon nanoparticles with a very smooth surface, able to scatter (and also trap) light very efficiently in a large-span frequency range. Porous silicon colloids have unique properties because of the following: (a) they behave as optical microcavities with a high refractive index, and (b) the intrinsic photoluminescence (PL) emission is coupled to the optical modes of the microcavity resulting in a unique luminescence spectrum profile. The PL spectrum constitutes an optical fingerprint identifying each particle, with application for biosensing.In this paper, we review the synthesis of silicon colloids for developing porous nanoparticles. We also report on the optical properties with special emphasis in the PL emission of porous silicon microcavities. Finally, we present the photonic barcode concept.
我们最近开发了一种新型多孔硅，我们称之为多孔硅胶体。它们由几乎完美的球形硅纳米粒子组成，表面非常光滑，能够在很宽的频率范围内高效地散射（也能捕获）光。由于以下原因，多孔硅胶体具有独特的性质：（a）它们表现为具有高折射率的光学微腔，（b）本征光致发光（PL）发射与微腔的光学模式耦合，导致独特的发光光谱轮廓。PL 光谱构成了识别每个粒子的光学指纹，可用于生物传感。在本文中，我们综述了用于开发多孔纳米粒子的硅胶体的合成。我们还报告了光学性质，特别强调多孔硅微腔的 PL 发射。最后，我们提出了光子条码的概念。
