Morselli Giacomo, Romano Francesco, Ceroni Paola
Department of Chemistry "Giacomo Ciamician", University of Bologna, via Selmi 2, 40126, Bologna, Italy.
Faraday Discuss. 2020 Jun 19;222(0):108-121. doi: 10.1039/c9fd00089e.
When functionalised with amines, silicon nanocrystals (SiNCs) are known to have surface-state emission with loss of colour tunability, low quantum yield and short nanosecond lifetimes. These changes in optical properties are produced by direct amine bonding on the silicon surface. In this article, secondary amine functionalised SiNCs with bright, red (λmax = 750 nm) and long-lived emission (τ ca. 50 μs) are reported for the first time via a three-step synthetic approach. These SiNCs are colloidally stable in several polar solvents and can be further functionalised by reaction with carboxylic acid groups. We proved the feasibility of further functionalization with pyrene butyric acid: ca. 40 pyrene units per nanoparticle were attached via amide bond formation. The resulting hybrid system works as a light-harvesting antenna: excitation of pyrene units at 345 nm results in sensitised emission at 700 nm by the silicon core.
当用胺进行功能化时，已知硅纳米晶体（SiNCs）具有表面态发射，但会失去颜色可调性、量子产率低且纳秒寿命短。这些光学性质的变化是由胺直接键合在硅表面产生的。在本文中，首次通过三步合成方法报道了具有明亮红色（λmax = 750 nm）和长寿命发射（τ约50 μs）的仲胺功能化SiNCs。这些SiNCs在几种极性溶剂中具有胶体稳定性，并且可以通过与羧酸基团反应进一步功能化。我们证明了用芘丁酸进一步功能化的可行性：通过酰胺键形成，每个纳米颗粒连接了约40个芘单元。所得的混合系统用作光捕获天线：在345 nm处激发芘单元会导致硅核在700 nm处产生敏化发射。
