Paternò Giuseppe Maria, Moscardi Liliana, Donini Stefano, Ariodanti Davide, Kriegel Ilka, Zani Maurizio, Parisini Emilio, Scotognella Francesco, Lanzani Guglielmo
Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, Via Giovanni Pascoli, 70/3, 20133 Milano, Italy.
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
J Phys Chem Lett. 2019 Sep 5;10(17):4980-4986. doi: 10.1021/acs.jpclett.9b01612. Epub 2019 Aug 15.
Photonic crystal-based biosensors hold great promise as low-cost devices for real-time monitoring of a variety of biotargets, for example, bacterial contaminants in food. Here, we report the proof-of-concept for a new colorimetric sensor of bacterial contamination, which is based on a novel hybrid plasmonic-photonic device. Our system consists of a layer of silver, a plasmonic metal exhibiting a well-known bioactivity, on top of a one-dimensional photonic crystal. We attribute the bioresponsivity to the formation of polarization charges at the Ag/bacterium interface within a sort of "bio-doping" mechanism. Interestingly, this triggers a blue shift in the photonic response. As an example, we assessed the validity of our approach by detecting one of the most hazardous contaminants, . This work demonstrates that our device can be a low-cost and portable platform for the detection of common bacterial contaminants.
基于光子晶体的生物传感器作为用于实时监测各种生物靶标的低成本设备具有巨大潜力，例如食品中的细菌污染物。在此，我们报告了一种基于新型混合等离子体 - 光子器件的细菌污染比色传感器的概念验证。我们的系统由一层银组成，银是一种具有众所周知生物活性的等离子体金属，位于一维光子晶体之上。我们将生物响应性归因于在一种“生物掺杂”机制内Ag/细菌界面处极化电荷的形成。有趣的是，这会引发光子响应的蓝移。例如，我们通过检测最危险的污染物之一来评估我们方法的有效性。这项工作表明，我们的设备可以成为检测常见细菌污染物的低成本便携式平台。
