General low-temperature reaction pathway from precursors to monomers before nucleation of compound semiconductor nanocrystals.

Nat Commun 2016 08 17;7:12223. Epub 2016 Aug 17.

Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China.

Little is known about the molecular pathway to monomers of semiconductor nanocrystals. Here we report a general reaction pathway, which is based on hydrogen-mediated ligand loss for the precursor conversion to 'monomers' at low temperature before nucleation. We apply (31)P nuclear magnetic resonance spectroscopy to monitor the key phosphorous-containing products that evolve from MXn+E=PPh2H+HY mixtures, where MXn, E=PPh2H, and HY are metal precursors, chalcogenide precursors, and additives, respectively. Surprisingly, the phosphorous-containing products detected can be categorized into two groups, Ph2P-Y and Ph2P(E)-Y. On the basis of our experimental and theoretical results, we propose two competing pathways to the formation of M2En monomers, each of which is accompanied by one of the two products. Our study unravels the pathway of precursor evolution into M2En monomers, the stoichiometry of which directly correlates with the atomic composition of the final compound nanocrystals.

Download full-text PDF

Source
http://dx.doi.org/10.1038/ncomms12223DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4992053PMC
August 2016
109 Reads

Publication Analysis

Top Keywords

m2en monomers
8
phosphorous-containing products
8
semiconductor nanocrystals
8
reaction pathway
8
additives surprisingly
4
precursors additives
4
chalcogenide precursors
4
products detected
4
groups ph2p-y
4
ph2p-y ph2pe-y
4
categorized groups
4
detected categorized
4
precursors chalcogenide
4
surprisingly phosphorous-containing
4
e=pph2h metal
4
spectroscopy monitor
4
monitor key
4
resonance spectroscopy
4
magnetic resonance
4
nuclear magnetic
4

Similar Publications