Title: Evolution of Surface Copper(II) Environments in Cu2–xSe Nanoparticles

Journal Article · · Chemistry of Materials
 [1];  [2];  [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Pittsburgh, PA (United States). Dept. of Chemistry; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Pittsburgh, PA (United States). Dept. of Chemistry
  3. Univ. of Pittsburgh, PA (United States). Dept. of Chemistry. Dept. of Chemical Engineering. Dept. of Mechanical Engineering and Materials Science

Cu2–xSe nanoparticles are part of a promising class of alternative plasmonic materials where the location, stability, and structural impact of charge carrier generation are crucial to their optoelectronic performance. Electron paramagnetic resonance spectroscopy is used to identify the location and dynamics of Cu2+ environments that form upon air-induced oxidation of Cu2–xSe nanoparticles. The results indicate the formation of two distinct Cu2+ environments at or near the surface of the nanoparticle. The first environment can be assigned to Cu2+ bound to oleylamine capping ligands, and the second can be assigned to Cu2+ located in CuO domains. In addition, these experiments indicate that the observed Cu2+ environments are consistent with vacancy formation on the Cu sublattice, which are mobile (i.e., vacancy hopping) at temperatures down to 180 K. Taken together, our results elucidate time scales of air-mediated Cu oxidation in Cu2–xSe nanoparticles, the chemical environments of the resulting Cu2+ species, and the impact of this oxidation on the overall particle crystallographic structure and optoelectronic properties.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Pittsburgh, PA (United States)
Sponsoring Organization:
Defense Threat Reduction Agency (DTRA) (United States); National Science Foundation (NSF) (United States); USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1485396
Report Number(s):
LA-UR-18-28650
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 20 Vol. 30; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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