Teunis, Meghan B.Lawrence, Katie N.Dolai, Sukanta2015-09-082015-09-082013-04-05Teunis, Meghan B., Katie N. Lawrence, and Sukanta Dolai. (2013, April 5). Size-Dependent Optical and Electrochemical Energy Gaps Comparison of CdSe Nanolusters. Poster session presented at IUPUI Research Day 2013, Indianapolis, Indiana.https://hdl.handle.net/1805/6779poster abstractThe size-dependent optical and electronic properties of semiconductor nanocrystals have made them the focus of much research including the designing of photovoltaic devices and photocatalysts. These properties occur as a result of the phenomenon called quantum confinement. To improve the device efficiency it is important to have a better understanding of their size dependent electrochemical properties. Herein we demonstrate for the first time, a comparison of the size dependent optical properties and electrochemical energy gaps of poly(ethylene glycol) thiolate-protected ultra-small CdSe nanoclusters. The electrochemical energy gaps for various sized nanoclusters were determined from cyclic and differential pulse voltammetry in organic solvent/electrolyte medium, where large, moleculelike HOMO-LUMO energy gaps were observed. It was also found that a significant amount of charging energy is involved in the electrochemical energy gap. The effect of the thickness of the surface-pasivating ligands on the HOMO-LUMO energy gap is demonstrated and a quantized double layer (QDL) charging model presented.en-USsemiconductor nanocrystalsphotovoltaic devicesphotocatalystsquantum confinementsize dependent electrochemical propertiessize dependent optical propertieselectrochemical energy gapspoly(ethylene glycol) thiolate-protected ultra-small CdSe nanoclustersPresentation