Self-assembly of near-unity helical Ce1−xMxO2 (x = 0.1, M = Ni and Bi) solid solutions with tunable optical activity†
Abstract
Left-handed Ni/Bi modified Ce1−xMxO2 solid solutions were synthesized via a self-assembly process. The solutions show tunable optical activity throughout the whole UV–visible range. The negative Cotton effect observed in the UV–visible range is ascribed to the electronic exciton coupling between left-handed helical structures.