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Title: High-fraction brookite films from amorphous precursors

Journal Article · · Scientific Reports
 [1];  [2]; ORCiD logo [3];  [4];  [5];  [6]; ORCiD logo [7];  [5]; ORCiD logo [8];  [6];  [5];  [9];  [1]
  1. Oregon State Univ., Corvallis, OR (United States). Dept. of Physics
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Applied Energy Programs
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
  4. Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering
  5. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States). Applied Energy Programs; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  9. Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering

Structure-specific synthesis processes are of key importance to the growth of polymorphic functional compounds such as TiO2, where material properties strongly depend on structure as well as chemistry. The robust growth of the brookite polymorph of TiO2, a promising photocatalyst, has been difficult in both powder and thin-film forms due to the disparity of reported synthesis techniques, their highly specific nature, and lack of mechanistic understanding. In this work, we report the growth of high-fraction (~95%) brookite thin films prepared by annealing amorphous titania precursor films deposited by pulsed laser deposition. We characterize the crystallization process, eliminating the previously suggested roles of substrate templating and Na helper ions in driving brookite formation. Instead, we link phase selection directly to film thickness, offering a novel, generalizable route to brookite growth that does not rely on the presence of extraneous elements or particular lattice-matched substrates. In addition to providing a new synthesis route to brookite thin films, our results take a step towards resolving the problem of phase selection in TiO2 growth, contributing to the further development of this promising functional material.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Next Generation of Materials by Design: Incorporating Metastability (CNGMD); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308; AC02-76SF00515; ACI-1548562; AC02-05CH11231
OSTI ID:
1409492
Alternate ID(s):
OSTI ID: 1410515; OSTI ID: 1418211; OSTI ID: 1419455
Report Number(s):
NREL/JA-5K00-70535
Journal Information:
Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (4)

Understanding crystallization pathways leading to manganese oxide polymorph formation journal June 2018
Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties journal January 2020
Utilizing TiO 2 amorphous precursors for polymorph selection: An in situ TEM study of phase formation and kinetics journal December 2019
Crystallization of TiO 2 polymorphs from RF-sputtered, amorphous thin-film precursors journal February 2020

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