Functionalized Block-Copolymer Templates for Synthesis and Shape Control of Quantum Dots
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.322
Functionalized Block-Copolymer Templates for Synthesis and Shape Control of Quantum Dots Brian Billstrand1, Kaifu Bian1, Casey Karler1 and Hongyou Fan1,2,*
1
Sandia National Laboratories, Advanced Materials Laboratory, Albuquerque, New Mexico, 87106, United States;
2 The University of New Mexico Center for Micro-Engineered Materials, Department of Chemical and Biological Engineering, Albuquerque, New Mexico 8713, United States
ABSTRACT
A new quantum dot synthesis method based on metallic-block copolymer precursors was developed. The synthesis produced CdS QDs assembled into chains. This method provides a new model for the study of 1D QD chains to determine its effect on charge transport and optoelectronic coupling. This synthesis method was readily extended to other semiconductor materials including PbS and perovskites producing QDs of various shapes. It evidenced further promise of this synthesis method to assist in the assembly, shape and size control of various nanomaterials
INTRODUCTION Semiconductor quantum dots (QDs) have received a lot of attention in the past decades due to their band gap tunability due to quantum confinement and high photoluminescense quantum yields (PLQY).[1] The unique optical properties of QDs have led to their utilization in applications including solar cells, light emitting diodes, photocatalysis and biological labeling [2-4]. Previous research efforts have resulted in a wide variety of QD synthesis methods via a variety of routes such as micellular, solvothermal, hydrothermal and hot injection techniques. [5-8] Many of these syntheses relied upon oleate or trioctylphosphine based precursors.[9] Instead, in this work, a novel QD synthesis using carboxylate block copolymer precursor was developed. Additionally to build on the wide basis of isolated QDs there has been an emphasis on the selfassembly of QDs into superstructures. Examples of these superstructures include the formation of quantum dot superlattices, chains, and necklace structures which exhibited unique optical properties due to changes in electronic state, electron injection, enhanced carrier diffusion length and plasmon coupling.[10-14] It is especially difficult to assemble spherical nanoparticles linearly due to their isotropic nature resulting in few examples. This work reports a novel synthesis for the one-dimensional assembly of CdS QDs using cadmium-polysyrene-b-polyacrylic acid (PS-PAA) block copolymer complex
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precursor. This method provides a new model for the study of 1D QD chains to determine its effect on charge transport and optoelectronic coupling. It was also shown that this synthesis method could be extended to other semiconductor materials including PbS and perovskites resulting into QD
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