非晶光子晶体传感器检测硝胺类炸药的研究

Photonic crystal(photonic crystals, PhC) is a periodic material composed of high and low dielectric constants in long-range, Which has a stop band and angular-dependence due to the Bragg’s law of diffraction. With the remarkable advantages of well defined physical properties and colorimetric detection mode, the PhC has been widely used as chemical and biological sensors. In principle, because of the effect of Bragg diffraction, the traditional PhC materials show different structural colors when observed from different angles, which is disadvantageous for the application of some optical materials and devices. The present project will solve the problem of angle dependence of the photonic crystal sensor based on the amorphous photonic crystal(Amorphous photonic crystals, APC) structure. The research contents are as follows: The simulation software electromagnetic physics module are employed to Modeling the APC structure and simulate bandgaps, which used to design the APC sensors. By combined the preparation of molecularly imprinted colloidal microspheres and Self-assembly APC technology, non-angle-dependent APC sensor with nitramine explsives as the detection target will be fabricated, and then Real-time, rapid, visual inspection of second-generation ammonium nitrate explosives in solution will be achieved. This project will propose a design method and preparation method of non-angle-dependent molecularly imprinted APC sensor, and is expected to reveal the independent color generation mechanism of the APC structure.

具有长程有序结构的光子晶体（photonic crystals, PhC）与光的相互作用符合布拉格衍射规律，由此产生了特定的光学禁带和角度依赖性，后者表现为不同观察角度呈现不同颜色，影响PhC传感器的比色检测准确性。本项目拟采用非晶光子晶体（Amorphous photonic crystals, APC）结构解决传统PhC传感器的角度依赖性问题，首先对APC结构进行建模和禁带的数值模拟，设计出APC传感器的结构；然后利用分子印迹胶体微球制备技术和APC自组装技术，实现以典型硝胺类炸药RDX和HMX为检测目标物的非角度依赖分子印迹APC传感器的设计和制备，可实现对目标物的实时、快速和可视化检测。通过项目研究将提出一种短程有序、长程无序的分子印迹APC结构设计方法，制备出一种可用于裸眼检测的非角度依赖性分子印迹APC传感器，并有望揭示APC无角度依赖性的结构色产生机理。

传统光子晶体具有独特的光学禁带性能，在传感器、催化、防伪和光学器件等领域具有广泛的应用。由于符合布拉格衍射规律，光子晶体传感器具有一定的角度依赖性，严重影响传感器的检测准确性。本项目提出的非晶光子晶体具有短程有序、长程无序的微观结构，其光子禁带的波长带宽与位置不随入射光角度的变化而变化，因此呈现出非角度依赖的结构色。以硝铵类爆炸物为检测目标物的非晶光子晶体传感器具有较高选择性，可进行快速实时裸眼检测，极大提高了检测准确性。重要研究成果为：1）制备了粒径均匀可调且单分散性较好的胶体微球，采用喷涂法制备了短程有序长程无序的非晶光子晶体阵列；2）通过调节微球粒径的大小，可制备出多种结构色的非晶光子晶体阵列，且结构色无角度依赖；3）使用机械臂及程序调控，实现了全自动大面积非晶光子晶体制备；4）制备了2,4,6-三硝基甲苯（TNT）、环三次甲基三硝胺（RDX）和环四亚甲基四硝胺（HMX）印迹的非晶光子晶体传感器，响应时间为10s，检测限为0.01mM；5）利用HSB及CIE颜色分析手段，结合主成分分析法和模式识别等方法，构建了相较于单一传感器具有更高选择性和灵敏度的传感器组，实现对目标物定性及半定量检测；6）出版译著1部和专著1部，发表22篇SCI论文（封面论文3篇），获得两项中国高等教育学会奖，申请专利7件，培养博士研究生3名，硕士研究生7名，建立了与多位国际同行的合作关系。