Enhanced Ferromagnetism from Organic–Cerium Oxide Hybrid Ultrathin Nanosheets

Yan, Guangyuan; Wang, Yizhan; Zhang, Ziyi; Li, Jun; Carlos, Corey; German, Lazarus N.; Zhang, Chenyu; Wang, Jingyu; Voyles, Paul M.; Wang, Xudong

doi:10.1021/acsami.9b15841

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

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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:

^[1];

^[2];

^[2]; Carlos, Corey ^[2]; German, Lazarus N. ^[2]; Zhang, Chenyu ^[2]; Wang, Jingyu ^[2];

^[2];

^[2]

Univ. of Wisconsin-Madison, WI (United States); Dalian Univ. of Technology (China)
Univ. of Wisconsin-Madison, WI (United States)

Publication Date:: Tue Nov 05 00:00:00 EST 2019

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:: Journal Article: 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.  doi:10.1021/acsami.9b15841.

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                    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

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                    Yan, Guangyuan, Wang, Yizhan, Zhang, Ziyi, Li, Jun, Carlos, Corey, German, Lazarus N., Zhang, Chenyu, Wang, Jingyu, Voyles, Paul M., and Wang, Xudong. 2019.  
        "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.

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@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},

  url          = {https://www.osti.gov/biblio/1635635},
  journal      = {ACS Applied Materials and Interfaces},

  issn         = {1944-8244},

  number       = 47,

  volume       = 11,

  place        = {United States},

  year         = {Tue Nov 05 00:00:00 EST 2019},

  month        = {Tue Nov 05 00:00:00 EST 2019}

}

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