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Title: Synthesis of 2D Hexagonal Hematite Nanosheets and the Crystal Growth Mechanism

Abstract

Nanostructure engineering of hematite is a promising strategy to overcome its performance limitations as a photodegradation catalyst for organic dyes or toxic organic chemicals. Precise control of exposed facets plays a vital role as an optimization strategy. Although great progress has been made in the synthesis of different crystal morphologies, design principles remain ad hoc, awaiting systematic control of facet expression within a clean synthesis protocol yielding versatile results. Herein, we report a simple method that enables precise morphology control to synthesize 2D hexagonal hematite nanosheets from 2-line ferrihydrite. Nanosheet sizes and facet proportions were successfully tuned by changing the pH, the ratio of solvent ethanol to water, and the concentration of Fe (III) ions. The growth mechanism appears to involve a combination of ferrihydrite solid-state transformation and assembly into hematite, followed by ion-by-ion growth that perfects the surface terminations. The finding helps establish a rational basis for design and optimization of hematite nanostructures.

Authors:
 [1];  [2];  [1]; ORCiD logo [2];  [2]; ORCiD logo [2];  [2];  [3]; ORCiD logo [2]
  1. UNIVERSITY PROGRAMS
  2. BATTELLE (PACIFIC NW LAB)
  3. Nanjing University
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1615014
Report Number(s):
PNNL-SA-148919
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 58; Journal Issue: 24
Country of Publication:
United States
Language:
English
Subject:
hematite, nanosheets, crystal growth, mechanism, ferrihydrite, ST1, ST3

Citation Formats

Zong, Meirong, Zhang, Xin, Wang, Yining, Huang, Xiaopeng, Zhou, Jianbin, Wang, Zheming, De Yoreo, James J., Lu, Xiancai, and Rosso, Kevin M. Synthesis of 2D Hexagonal Hematite Nanosheets and the Crystal Growth Mechanism. United States: N. p., 2019. Web. doi:10.1021/acs.inorgchem.9b02883.
Zong, Meirong, Zhang, Xin, Wang, Yining, Huang, Xiaopeng, Zhou, Jianbin, Wang, Zheming, De Yoreo, James J., Lu, Xiancai, & Rosso, Kevin M. Synthesis of 2D Hexagonal Hematite Nanosheets and the Crystal Growth Mechanism. United States. doi:10.1021/acs.inorgchem.9b02883.
Zong, Meirong, Zhang, Xin, Wang, Yining, Huang, Xiaopeng, Zhou, Jianbin, Wang, Zheming, De Yoreo, James J., Lu, Xiancai, and Rosso, Kevin M. Mon . "Synthesis of 2D Hexagonal Hematite Nanosheets and the Crystal Growth Mechanism". United States. doi:10.1021/acs.inorgchem.9b02883.
@article{osti_1615014,
title = {Synthesis of 2D Hexagonal Hematite Nanosheets and the Crystal Growth Mechanism},
author = {Zong, Meirong and Zhang, Xin and Wang, Yining and Huang, Xiaopeng and Zhou, Jianbin and Wang, Zheming and De Yoreo, James J. and Lu, Xiancai and Rosso, Kevin M.},
abstractNote = {Nanostructure engineering of hematite is a promising strategy to overcome its performance limitations as a photodegradation catalyst for organic dyes or toxic organic chemicals. Precise control of exposed facets plays a vital role as an optimization strategy. Although great progress has been made in the synthesis of different crystal morphologies, design principles remain ad hoc, awaiting systematic control of facet expression within a clean synthesis protocol yielding versatile results. Herein, we report a simple method that enables precise morphology control to synthesize 2D hexagonal hematite nanosheets from 2-line ferrihydrite. Nanosheet sizes and facet proportions were successfully tuned by changing the pH, the ratio of solvent ethanol to water, and the concentration of Fe (III) ions. The growth mechanism appears to involve a combination of ferrihydrite solid-state transformation and assembly into hematite, followed by ion-by-ion growth that perfects the surface terminations. The finding helps establish a rational basis for design and optimization of hematite nanostructures.},
doi = {10.1021/acs.inorgchem.9b02883},
journal = {Inorganic Chemistry},
number = 24,
volume = 58,
place = {United States},
year = {2019},
month = {12}
}