Citation:
David Stone, Li, Xiang , Naor, Tom , Dai, Jiekai , Remennik, Sergei , and Banin, Uri . 2023. “Size And Emission Control Of Wurtzite Inp Nanocrystals Synthesized From Cu3&Ndash;XP By Cation Exchange”. Chemistry Of Materials, 35, 24, Pp. 10594–10605. https://doi.org/10.1021/acs.chemmater.3c02226. Copy at http://https://tinyurl.com/ys5f6krs
Abstract:
Phosphide-based nanocrystals (NCs), including InP and Cu3–xP, are relevant for applications in light-emitting devices and catalysis,
yet their synthetic design is limited in terms of size range and homogeneity. We report the synthesis of uniform and size-controlled emissive wurtzite-phase InP NCs formed via cation exchange from Cu3–xP. First, size-controlled Cu3–xP NCs are synthesized by the formation of metallic Cu0 NCs and their phosphidation to Cu3–xP. By changing the ligands and precursor concentrations, the NC size is varied between 5 and 13 nm. Using cation exchange, InP NCs are then generated. As the surface of InP NCs is prone to oxidation and defects that decrease their emission, we performed a reaction with NOBF4. This yields InP NCs with resolved absorption features and efficient band-gap emission as a result of impurity removal and surface passivation. The effect of water, acid, and halides on the balance of NC etching and surface passivation is studied. With this approach, high-quality wurtzite InP NCs are obtained while the emission is tuned between 810 and 600 nm. The obtained NCs are potential building blocks for catalytic and optoelectronic applications.