Yang Cui-Cui, Tian Wei Quan
College of Science, Chongqing University of Technology, No. 69 Hongguang Avenue, Banan, Chongqing, 400054, P. R. China.
College of Chemistry and Chemical Engineering, Chongqing University, No. 55 Daxuecheng South Road, Shapingba, Chongqing, 401331, P. R. China.
Chempluschem. 2023 Aug;88(8):e202300279. doi: 10.1002/cplu.202300279.
Nanographenes (NGs) have drawn extensive attention as promising candidates for next-generation optoelectronic and nonlinear optical (NLO) materials, owing to its unique optoelectronic properties and high thermal stability. However, the weak polarity or even non-polarity of NGs (resulting in weak even order NLO properties) and the high chemical reactivity of zigzag edged NGs hinder their further applications in nonlinear optics, thus stabilization (lowering the chemical reactivity) and polarizing the charge distribution in NGs are necessary for such applications of NGs. The fusion of heptagon and pentagon endows the azulene with the character of donor-acceptor, and the B=N unit is isoelectronic to C=C unit. The introduction of polar azulene and BN are idea to polarize and stabilize the electronic structure of NGs for NLO applications. In the present review, a survey on the functionalization and applications of NGs in nonlinear optics is conducted. The engineering of the electronic structure of NGs by topological defects, doping and edge modulation is summarized. Finally, a summary of challenges and perspectives for carbon-based NLO nanomaterials is presented.
由于其独特的光电特性和高热稳定性，纳米石墨烯（NGs）作为下一代光电子和非线性光学（NLO）材料的有前途的候选者，已引起广泛关注。然而，NGs的弱极性甚至非极性（导致偶数阶NLO特性较弱）以及锯齿形边缘NGs的高化学反应性阻碍了它们在非线性光学中的进一步应用，因此，稳定化（降低化学反应性）和使NGs中的电荷分布极化对于NGs的此类应用是必要的。七元环和五元环的融合赋予了薁供体-受体的特性，并且B=N单元与C=C单元等电子。引入极性薁和BN对于使NGs的电子结构极化并稳定化以用于NLO应用是理想的。在本综述中，对NGs在非线性光学中的功能化和应用进行了综述。总结了通过拓扑缺陷、掺杂和边缘调制对NGs电子结构的调控。最后，对基于碳的NLO纳米材料的挑战和前景进行了总结。
