Fig. 2: Formation of Zn–Se linkage on oleate-capped InP NCs. | Nature Communications

Fig. 2: Formation of Zn–Se linkage on oleate-capped InP NCs.

From: Heteroepitaxial chemistry of zinc chalcogenides on InP nanocrystals for defect-free interfaces with atomic uniformity

Fig. 2

a Introduction of Zn from zinc oleate [Zn(OA)2] to InP–OA through the In-to-Zn surface exchange (InP–Zn) and formation of Zn–Se linkage on InP–OA in the presence of Zn(OA)2 and SePR’3 (InP–ZnSe). The latter proceeds together with adsorbed species between (i) an exchanged oleate-capped Zn adatom and datively bound SePR’3 or (ii) datively bound Zn(OA)2 and Intermediate 1 that produces pentacoordinate dioleoyloxytrioctylphosphorane (Intermediate 2). This compound is separately prepared by nucleophilic addition of oleate to SePR’3, as shown on the right. b 31P NMR spectra of InP–ZnSe (reacted at 200 °C) recorded at 25 °C (top, light blue) and –40 °C (bottom, blue). Asterisk (*) indicates OPR’3. c 31P NMR spectra of reaction products using SePR’3 and OA (top, grey), and PR’3 and OA (bottom, black). Double dagger (‡) represents 31P–77Se coupling (JP–Se = 680 Hz). d Diffusion coefficient (D)–molecular weight (Mw) plot of trioctylamine (NR’3, square), PR’3 (circle), SePR’3 (triangle), 1-SeH (diamond), and 2 (pentagon) characterised by 1H diffusion-ordered spectroscopy (DOSY) in CDCl3. e Temporal change in 1S peak of InP–ZnSe synthesised by the simultaneous addition of Zn(OA)2 and SePR’3 (light blue circle) to InP–OA NCs with a size of 2.4 nm at 200 °C. The addition of HF in acetone (purple triangle) results in the desorption of adsorbates on InP–ZnSe. Source data are provided as a Source Data file.

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