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Title: Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets

Abstract

Room-temperature ferromagnetism in two-dimensional (2D) oxide materials is an intriguing phenomenon for spintronic applications. Here, we report significantly enhanced room-temperature ferromagnetism observed from ultrathin cerium oxide nanosheets hybridized with organic surfactant molecules. The hybrid nanosheets were synthesized by ionic layer epitaxy over a large area at the water–air interface. The nanosheets exhibited a saturation magnetization of 0.149 emu/g as their thickness reduced to 0.67 nm. This value was 5 times higher than that for CeO2 thin films and more than 20 times higher than that for CeO2 nanoparticles. The magnetization was attributed to the high concentration (15.5%) of oxygen vacancies stabilized by surfactant hybridization as well as electron transfer between organic and oxide layers. Lastly, this work brings an effective strategy of introducing strong ferromagnetism to functional oxide materials, which leads to a promising route toward exploring new physical properties in 2D hybrid nanomaterials.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Univ. of Wisconsin-Madison, WI (United States); Dalian Univ. of Technology (China)
  2. Univ. of Wisconsin-Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin-Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Army Research Office (ARO); National Science Foundation (NSF)
OSTI Identifier:
1635635
Grant/Contract Number:  
FG02-08ER46547; AC02-06CH11357; W911NF-16-1-0198; DMR-1709025
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 11; Journal Issue: 47; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ferromagnetism; organic−oxide hybrid; two-dimensional nanomaterials; ionic layer epitaxy; oxygen vacancies; thickness; two-dimensional materials; magnetic properties; surfactants; X-ray photoelectron spectroscopy

Citation Formats

Yan, Guangyuan, Wang, Yizhan, Zhang, Ziyi, Li, Jun, Carlos, Corey, German, Lazarus N., Zhang, Chenyu, Wang, Jingyu, Voyles, Paul M., and Wang, Xudong. Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets. United States: N. p., 2019. Web. https://doi.org/10.1021/acsami.9b15841.
Yan, Guangyuan, Wang, Yizhan, Zhang, Ziyi, Li, Jun, Carlos, Corey, German, Lazarus N., Zhang, Chenyu, Wang, Jingyu, Voyles, Paul M., & Wang, Xudong. Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets. United States. https://doi.org/10.1021/acsami.9b15841
Yan, Guangyuan, Wang, Yizhan, Zhang, Ziyi, Li, Jun, Carlos, Corey, German, Lazarus N., Zhang, Chenyu, Wang, Jingyu, Voyles, Paul M., and Wang, Xudong. Tue . "Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets". United States. https://doi.org/10.1021/acsami.9b15841. https://www.osti.gov/servlets/purl/1635635.
@article{osti_1635635,
title = {Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets},
author = {Yan, Guangyuan and Wang, Yizhan and Zhang, Ziyi and Li, Jun and Carlos, Corey and German, Lazarus N. and Zhang, Chenyu and Wang, Jingyu and Voyles, Paul M. and Wang, Xudong},
abstractNote = {Room-temperature ferromagnetism in two-dimensional (2D) oxide materials is an intriguing phenomenon for spintronic applications. Here, we report significantly enhanced room-temperature ferromagnetism observed from ultrathin cerium oxide nanosheets hybridized with organic surfactant molecules. The hybrid nanosheets were synthesized by ionic layer epitaxy over a large area at the water–air interface. The nanosheets exhibited a saturation magnetization of 0.149 emu/g as their thickness reduced to 0.67 nm. This value was 5 times higher than that for CeO2 thin films and more than 20 times higher than that for CeO2 nanoparticles. The magnetization was attributed to the high concentration (15.5%) of oxygen vacancies stabilized by surfactant hybridization as well as electron transfer between organic and oxide layers. Lastly, this work brings an effective strategy of introducing strong ferromagnetism to functional oxide materials, which leads to a promising route toward exploring new physical properties in 2D hybrid nanomaterials.},
doi = {10.1021/acsami.9b15841},
journal = {ACS Applied Materials and Interfaces},
number = 47,
volume = 11,
place = {United States},
year = {2019},
month = {11}
}

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