A Novel Approach for the Preparation of InP Nanocrystals
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0942-W08-24
A Novel Approach for the Preparation of InP Nanocrystals ZHAOYONG SUN, JUN ZHANG, MING ZHANG, and JIYE FANG UNIVERSITY OF NEW ORLEANS, NEW ORLEANS, LA, 70148
ABSTRACT III-V semiconductor nanocrystals are of considerable interest due to their extensive applications in the optoelectronic and biomedical fields. In order to meet the practical use, the convenient and scalable production of III-V narrow-disperse nanocrystals is inspiring. We report an efficient and rapid method of preparing InP nanocrystals using a wetchemical redox synthetic approach with a noncoordinating solvent, employing organic reducing agent LiBH(CH2CH3)3 and yellow phosphor. As advantages of this approach, reaction temperature is relatively low (80°C-120°C) and reaction time is less than 2 hours. Our characterization shows that the photoluminescence properties of InP nanocrystals are highly dependent on the particle size.
INTRODUCTION The syntheses and properties of semiconductor nanocrystals (NCs) have been extensively studied over many years due to the fact that their optical behaviors vary as a function of crystalline size. II-VI and III-V thin film semiconductors are the hot materials which have therefore been investigated by many research groups. Recently, II-VI and IVVI semiconductor NCs have also attracted great interests because they are readily prepared and easily available in commercial quantities [1-6]. However, the traditional preparation method for producing III-V semiconductor NCs requires strict experimental conditions (e.g. high temperature up to 300°C) and is a time-consuming process, usually several (2-5) days [7-9]. In order to prepare InP NCs, the source of P is normally tris(trimethylsilyl)phosphine (P(TMS)3) and a thermal decomposition of this precursor is often employed. Although Battaglia et al. recently progressively improved the formation of InP NCs [10] by eliminating TOPO or DDA from the reaction system and shortened the reaction time from a few days to a few hours, P(TMS)3 as a very expensive precursor of P still has had to use. Later improvement by Madalina Furis et al. [11] didn’t further reduce the high-reaction temperature (~300°C) and relatively long-reaction time (2-3 hours). In this paper, we describe a new preparation method to fabricate InP NCs at relatively low reaction temperature without P(TMS)3 precursor.
EXPERIMENT Synthesis of InP NCs Dehydrated InCl3, trioctylphosphine (TOP), oleic acid (90%), hexadecane, red phosphorus and superhydride [LiBH(CH2CH3)3] solution (1M) in THF were purchased from Aldrich without further purification. TOP and yellow phosphorus solution in toluene which was prepared from red phosphorus were house-made and stored under argon. Superhydride in dioctylether solution (1 M) was prepared following a method reported by Sun [12]. In a typical experiment, 0.1mmol of InCl3, 0.05ml of oleic acid and 0.15ml of TOP were mixed with 7ml of hexadecane in a three-neck round-bottom flask equipped with a condenser. The system was vacuumed at room temperature and at 110°C for a w
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