Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), Universidad Nacional del Litoral-Conicet, Güemes 3450, Santa Fe 3000, Argentina.
Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO 65211, USA.
Sensors (Basel). 2023 Jan 28;23(3):1433. doi: 10.3390/s23031433.
Photonic crystals (PCs) are nanomaterials with photonic properties made up of periodically modulated dielectric materials that reflect light between a wavelength range located in the photonic band gap. Colloidal PCs (C-PC) have been proposed for several applications such as optical platforms for the formation of physical, chemical, and biological sensors based on a chromatic response to an external stimulus. In this work, a robust protocol for the elaboration of photonic crystals based on SiO particle (SP) deposition using the vertical lifting method was studied. A wide range of lifting speeds and particle suspension concentrations were investigated by evaluating the C-PC reflectance spectrum. Thinner and higher reflectance peaks were obtained with a decrease in the lifting speed and an increase in the SP concentrations up to certain values. Seven batches of twelve C-PCs employing a SP 3% suspension and a lifting speed of 0.28 µm/s were prepared to test the reproducibility of this method. Every C-PC fabricated in this assay has a wavelength peak in a range of 10 nm and a peak width lower than 90 nm. Inverse-opal polymeric films with a highly porous and interconnected morphology were obtained using the developed C-PC as a template. Overall, these results showed that reproducible colloidal crystals could be elaborated on a large scale with a simple apparatus in a short period, providing a step forward in the scale-up of the fabrication of photonic colloidal crystal and IO structures as those employed for the elaboration of photonic polymeric sensors.
光子晶体（PCs）是由周期性调制的介电材料组成的具有光子特性的纳米材料，其可以在光子带隙内的波长范围内反射光。胶体光子晶体（C-PC）已经被提出用于多种应用，例如基于对外界刺激的颜色响应形成物理、化学和生物传感器的光学平台。在这项工作中，研究了一种基于 SiO2 颗粒（SP）沉积的垂直提拉法制备光子晶体的稳健方案。通过评估 C-PC 的反射光谱，研究了广泛的提拉速度和颗粒悬浮浓度。通过降低提拉速度和增加 SP 浓度，可以获得更薄和更高反射率的峰，直到达到一定的值。制备了七批十二个采用 SP 3%悬浮液和 0.28 µm/s 提拉速度的 C-PC，以测试该方法的重现性。在该测定中制备的每一个 C-PC 都在 10nm 的波长范围内具有峰值，且峰宽低于 90nm。使用开发的 C-PC 作为模板，获得了具有高度多孔和互连形态的反蛋白石聚合物薄膜。总的来说，这些结果表明，可以使用简单的设备在短时间内大规模制备重现性良好的胶体晶体，为光子胶体晶体和 IO 结构的大规模制造提供了一步进展，这些结构用于制备光子聚合物传感器。
