Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.
J Phys Chem B. 2013 Feb 14;117(6):1537-43. doi: 10.1021/jp305607t. Epub 2012 Oct 15.
Thick electrophoretically deposited (EPD) films of ligand-capped colloidal nanocrystals that adhere to the substrate typically crack after they are removed from the deposition solvent due to the loss of residual solvent. We report the suppression of fracture in several micrometers thick EPD films of CdSe nanocrystals by treating the wet, as-deposited films with solutions containing the NC core-capping ligand, trioctylphosphine oxide (TOPO). The increase in TOPO ligand density increases photoluminescence of the dried film and leads to a decrease in elastic modulus.
厚的电泳沉积 (EPD) 薄膜通常在从沉积溶剂中取出后会因残留溶剂的损失而出现开裂，而这些薄膜是由配体封端的胶体纳米晶体组成并附着在基底上的。我们报告了通过用含有 NC 核封端配体三辛基氧化磷 (TOPO) 的溶液处理湿的、沉积后的薄膜，抑制了几微米厚的 CdSe 纳米晶体的 EPD 薄膜的断裂。TOPO 配体密度的增加会提高干燥薄膜的光致发光性能，并降低弹性模量。
