Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States.
Physik Weicher Materie , Technische Universität München , James-Frank-Str. 1 , 85748 Garching bei München , Germany.
Langmuir. 2018 Apr 24;34(16):4888-4896. doi: 10.1021/acs.langmuir.7b03746. Epub 2018 Apr 10.
Silicon nanocrystals (SiNCs) are abundant and exhibit exquisitely tailorable optoelectronic properties. The incorporation of SiNCs into highly porous and lightweight substrates such as aerogels leads to hybrid materials possessing the attractive features of both materials. This study describes the covalent deposition of SiNCs on and intercalation into silica aerogels, explores the properties, and demonstrates a prototype sensing application of the composite material. SiNCs of different sizes were functionalized with triethoxyvinylsilane (TEVS) via a radical grafting approach and subsequently used for the synthesis of photoluminescent silica hybrids. The resulting SiNC-containing aerogels possess high porosities, SiNC-based size-dependent photoluminescence, transparency, and a superhydrophobic macroscopic surface. The materials were used to examine the photoluminescence response toward low concentrations of 3-nitrotoluene (270 μM), demonstrating their potential as a sensing platform for high-energy materials.
硅纳米晶体（SiNCs）丰富，表现出极好的可调节光电性能。将 SiNCs 掺入到气凝胶等高度多孔和轻质的基质中，会得到同时具有这两种材料优点的复合材料。本研究描述了 SiNCs 在二氧化硅气凝胶上的共价沉积和插层，探讨了复合材料的性质，并展示了其作为一种传感应用的原型。不同尺寸的 SiNCs 通过自由基接枝法用三乙氧基乙烯基硅烷（TEVS）功能化，然后用于合成发磷光的硅基杂化物。所得的含 SiNC 的气凝胶具有高孔隙率、基于 SiNC 的尺寸依赖性磷光、透明度和超疏水性宏观表面。该材料被用于研究对低浓度 3-硝基甲苯（270 μM）的磷光响应，表明它们有潜力作为高能材料的传感平台。
