Synthesis of InP and InAs quantum rods using Indium Acetate and Myristic acid
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Synthesis of InP and InAs quantum rods using Indium Acetate and Myristic acid Itzhak Shweky, Assaf Aharoni, Taleb Mokari, Moshe Nadler, Eli Rothenberg, Inna Popov and Uri Banin Institute of Chemistry, Farkas Center for Light Induced Processes and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. E-mail: [email protected] ABSTRACT The development of solution based synthesis approaches for preparing nanocrystals of III-V semiconductor presents a significant & important challenge especially with relation to shape control to achieve rod growth. To this end, a novel approach for synthesis of soluble semiconductor quantum rods using metal nanoparticles to direct and catalyze one-dimensional growth is developed. The synthesis method is useful in particular for III-V semiconductor with cubic lattice, where the utilization of surfactant-controlled rod-growth is not easily realized. The growth takes place via the solution–liquid–solid (SLS) mechanism where proper precursors are injected into a coordinating solvent as we reported in earlier work for InAs nanorods. Herein, we report the synthesis of high quality InP nanorods using Indium Acetate and myristic acid with gold nanoparticles as the catalysts in the SLS growth mode. A similar route was successfully developed for the growth of InAs nanorods. We find that the amount of Au catalyst in the reaction is an important parameter to achieving shape control. Transmission electron microscope (TEM) images of InP and InAs nanocrystals revealed that the crystals are mostly rod-shaped. XRD measurements, absorption spectra were preformed for the nanorods characterization. INTRODUCTION An important challenge in current nanocrystal research is that of achieving shape control, as the properties the nanostructures can also be modified by the change of shape [1,2,3,4,5]. This has been convincingly demonstrated for semiconductor quantum rods (QRs), that serve as a model system for evolution of properties from zero-dimensional dots to one dimensional quantum wires. In the prototypical CdSe system QRs were found to have linearly polarized emission [6] and lasing unlike spherical dots, and the lasing threshold in rods was significantly reduced [7]. Moreover, photocells with QRs were found to provide improved performance over dots, and QRs are more readily accessible for integration into nanoelectrode structures. While CdSe (and other II-VI semiconductor) QRs are grown via a surfactant control growth approach, we found that this approach is difficult to realize in the cubic-structured III-V semiconductor nanocrystals. In these higher symmetry nanocrystals, it is deemed to be more difficult to find chemically dissimilar surfaces to allow for the growth kinetics to be modified by preferential binding of ligands as required in the surfactant controlled growth strategy. Instead, we developed the use of small gold nanocrystals to catalyze and direct rod growth via the solution-liquid-solid (SLS) mechanism [2]. While the SLS m
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