Directed Self-Assembly of Quantum Dots in a Nematic Liquid Crystal

TL;DR

This paper investigates how nematic liquid crystals can direct the self-assembly of quantum dots into chains, with controllable orientation via electric fields, and analyzes the system's dielectric relaxation to understand its dynamics and stability.

Contribution

It introduces a method to control quantum dot assembly using nematic liquid crystals and electric fields, providing insights into the dynamic relaxation behavior of the system.

Findings

Quantum dots form one-dimensional chains along the nematic director.

Electric fields can control the spatial orientation of quantum dot assemblies.

Dielectric relaxation reveals the intrinsic dynamics and stability of the system.

Abstract

Self organizing anisotropic nematic liquid crystals (LCs) induce self-assembly on quantum dots (QDs) to form one-dimensional chains along the nematic director. Spatial ordering of QDs, achieved in the nematic LC matrix, can be controlled in a preferred direction on application of electric fields, gaining better self-assembly. Once the field goes off, the LC+QD system relaxes back to the original state, revealing the intrinsic dynamics. Due to the dielectric anisotropy of the system, this dynamic response can be captured by studying dielectric relaxation. The studied dynamic response reveals insights on the field-induced self-assembly mechanism and the stability of the LC+QD system.