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Title: Building Materials from Colloidal Nanocrystal Assemblies: Molecular Control of Solid/Solid Interfaces in Nanostructured Tetragonal ZrO2

Journal Article · · Chemistry of Materials
 [1];  [2];  [3];  [4];  [2];  [5];  [1];  [1]; ORCiD logo [3]; ORCiD logo [6]
  1. Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
  2. Univ. of Sao Paulo (Brazil). Inst. of Physics
  3. Iowa State Univ., Ames, IA (United States). Dept. of Chemistry; Ames Lab., Ames, IA (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States). Michigan Ion Beam Lab.
  5. Iowa State Univ., Ames, IA (United States). Dept. of Chemical and Biological Engineering
  6. Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering. Dept. of Chemical and Biological Engineering; Ames Lab., Ames, IA (United States)

We describe in this paper a bottom-up approach to control the composition of solid/solid interfaces in nanostructured materials, and we test its effectiveness on tetragonal ZrO2, an inorganic phase of great technological significance. Colloidal nanocrystals capped with trioctylphosphine oxide (TOPO) or oleic acid (OA) are deposited, and the organic fraction of the ligands is selectively etched with O2 plasma. The interfaces in the resulting all-inorganic colloidal nanocrystal assemblies are either nearly bare (for OA-capped nanocrystals) or terminated with phosphate groups (for TOPO-capped nanocrystals) resulting from the reaction of phosphine oxide groups with plasma species. The chemical modification of the interfaces has extensive effects on the thermodynamics and kinetics of the material. Different growth kinetics indicate different rate limiting processes of growth (surface diffusion for the phosphate-terminated surfaces and dissolution for the “bare” surfaces). Phosphate termination led to a higher activation energy of growth, and a 3-fold reduction in interfacial energy, and facilitated significantly the conversion of the tetragonal phase into the monoclinic phase. Finally, films devoid of residual ligands persisted in the tetragonal phase at temperatures as high as 900 °C for 24 h.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Semiconductor Research Corporation (United States)
Grant/Contract Number:
AC02-07CH11358; 2015-IN-2582
OSTI ID:
1399482
Report Number(s):
IS-J9338
Journal Information:
Chemistry of Materials, Vol. 29, Issue 18; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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On the kinetics of the removal of ligands from films of colloidal nanocrystals by plasmas journal January 2019

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