构建手性胶体半导体纳米晶的两种新方法 /Two New Routes to Construct Chiral Colloidal Semiconductor Nanocrystals
/Two New Routes to Construct Chiral Colloidal Semiconductor Nanocrystals
报 告 人：高小青研究员（周云龙组）
Abstract：Chirality is always an amazing phenomenon in science and related to different fields of physics, chemistry, and biology. Recently, chiral nanomaterials got a fast progress with the rapid growth of nanotechnology. Especially, chiral colloidal semiconductor nanocrystals (NCs), as one kind of chiral nanomaterials, exhibit widespread potential applications in the fields of the detection and distinction of chiral medicines, the chiral catalysts, the construct of spin electronic devices, and so on.
Of the chiral colloidal semiconductor nanocrystals (NCs) systems constructed by chiral molecules stabilized NC the debate of the chiral origin in excitonic transitions is intense. Two different viewpoints of hybridization and dipole-dipole coupling were formed. In view of above issue, two new methods with two different chiral molecules of chiral diaminocyclohexane (L-DACH) and chiral menthol (L-MT) in stacked CdSe nanoplatelets (NPLs) are introduced. Here, the chiral DACH molecules acted as chiral ligands, and the chiral menthol molecules acted as the chiral solvent. The experimental results not only realized enhanced optical activity in organic solvent but also pointed out that dipole-dipole coupling is important to the produce of optical activity in NPLs. Moreover, a new theoretical model of induced circular dichroism (ICD) is introduced to explain the optical activity of the excitonic transitions in NPLs induced by the chiral solvent of L-MT. The research provides a new view to the construction of chiral NCs solution and improves the theoretical development of chiral science in nanotechnology.