Enhanced Room-Temperature Ferromagnetism on Co-Doped CeO2 Nanoparticles: Mechanism and Electronic and Optical Properties
The present study reports the effect of Co doping on the structural, optical, magnetic, and electronic properties of CeO2 nanoparticles (NPs) synthesized by a simple low-temperature co-precipitation method. Co doping was introduced by adding CoCl3 with different mole percentages (0%, 2%, 4%, and 6%)...
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Veröffentlicht in: | Journal of physical chemistry. C 2014-11, Vol.118 (46), p.27039-27047 |
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creator | Ranjith, Kugalur Shanmugam Saravanan, Padmanapan Chen, Shih-Hsien Dong, Chung-Li Chen, Chih Liang Chen, Shih-Yun Asokan, Kandasami Rajendra Kumar, Ramasamy Thangavelu |
description | The present study reports the effect of Co doping on the structural, optical, magnetic, and electronic properties of CeO2 nanoparticles (NPs) synthesized by a simple low-temperature co-precipitation method. Co doping was introduced by adding CoCl3 with different mole percentages (0%, 2%, 4%, and 6%) to cerium nitrate, which resulted in room-temperature ferromagnetism (RTFM). TEM and XRD analysis showed that the Co-doped CeO2 NPs are monodispersed with face centered cubic structure. The 6% Co-doped CeO2 NPs showed a coercivity value of 155 Oe and saturation magnetization of 0.028 emu/g at room temperature. The electronic structures of the as-prepared CeO2 and Co-doped CeO2 NPs were investigated by X-ray absorption near-edge structure (XANES) spectroscopy. The XANES spectra at Ce M- and L-edges clearly indicated a decrease in the valency state of Ce ions from Ce4+ to Ce3+ upon Co doping. This causes redistribution of oxygen ions and Co–Co bonding. The XANES study revealed that Co doping plays a prominent role in improving the ferromagnetism, as Co replaces the Ce site in the CeO2 cubic lattice and the concentration of oxygen vacancies may not be high enough to form a delocalized impurity band for enhancing the magnetic percolation of Co-doped samples. The XANES spectra at Co L-edges indicate direct Co–Co bond formation in the CeO2 lattices and also a weak bond with O ions. This is in agreement with the magnetic measurements which indicate that Co atoms induce enhancement in magnetic behavior in CeO2 nanostructures. |
doi_str_mv | 10.1021/jp505175t |
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Co doping was introduced by adding CoCl3 with different mole percentages (0%, 2%, 4%, and 6%) to cerium nitrate, which resulted in room-temperature ferromagnetism (RTFM). TEM and XRD analysis showed that the Co-doped CeO2 NPs are monodispersed with face centered cubic structure. The 6% Co-doped CeO2 NPs showed a coercivity value of 155 Oe and saturation magnetization of 0.028 emu/g at room temperature. The electronic structures of the as-prepared CeO2 and Co-doped CeO2 NPs were investigated by X-ray absorption near-edge structure (XANES) spectroscopy. The XANES spectra at Ce M- and L-edges clearly indicated a decrease in the valency state of Ce ions from Ce4+ to Ce3+ upon Co doping. This causes redistribution of oxygen ions and Co–Co bonding. The XANES study revealed that Co doping plays a prominent role in improving the ferromagnetism, as Co replaces the Ce site in the CeO2 cubic lattice and the concentration of oxygen vacancies may not be high enough to form a delocalized impurity band for enhancing the magnetic percolation of Co-doped samples. The XANES spectra at Co L-edges indicate direct Co–Co bond formation in the CeO2 lattices and also a weak bond with O ions. This is in agreement with the magnetic measurements which indicate that Co atoms induce enhancement in magnetic behavior in CeO2 nanostructures.</description><identifier>ISSN: 1932-7447</identifier><identifier>EISSN: 1932-7455</identifier><identifier>DOI: 10.1021/jp505175t</identifier><language>eng</language><publisher>American Chemical Society</publisher><ispartof>Journal of physical chemistry. C, 2014-11, Vol.118 (46), p.27039-27047</ispartof><rights>Copyright © 2014 American Chemical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/jp505175t$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/jp505175t$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,27076,27924,27925,56738,56788</link.rule.ids></links><search><creatorcontrib>Ranjith, Kugalur Shanmugam</creatorcontrib><creatorcontrib>Saravanan, Padmanapan</creatorcontrib><creatorcontrib>Chen, Shih-Hsien</creatorcontrib><creatorcontrib>Dong, Chung-Li</creatorcontrib><creatorcontrib>Chen, Chih Liang</creatorcontrib><creatorcontrib>Chen, Shih-Yun</creatorcontrib><creatorcontrib>Asokan, Kandasami</creatorcontrib><creatorcontrib>Rajendra Kumar, Ramasamy Thangavelu</creatorcontrib><title>Enhanced Room-Temperature Ferromagnetism on Co-Doped CeO2 Nanoparticles: Mechanism and Electronic and Optical Properties</title><title>Journal of physical chemistry. C</title><addtitle>J. Phys. Chem. C</addtitle><description>The present study reports the effect of Co doping on the structural, optical, magnetic, and electronic properties of CeO2 nanoparticles (NPs) synthesized by a simple low-temperature co-precipitation method. Co doping was introduced by adding CoCl3 with different mole percentages (0%, 2%, 4%, and 6%) to cerium nitrate, which resulted in room-temperature ferromagnetism (RTFM). TEM and XRD analysis showed that the Co-doped CeO2 NPs are monodispersed with face centered cubic structure. The 6% Co-doped CeO2 NPs showed a coercivity value of 155 Oe and saturation magnetization of 0.028 emu/g at room temperature. The electronic structures of the as-prepared CeO2 and Co-doped CeO2 NPs were investigated by X-ray absorption near-edge structure (XANES) spectroscopy. The XANES spectra at Ce M- and L-edges clearly indicated a decrease in the valency state of Ce ions from Ce4+ to Ce3+ upon Co doping. This causes redistribution of oxygen ions and Co–Co bonding. The XANES study revealed that Co doping plays a prominent role in improving the ferromagnetism, as Co replaces the Ce site in the CeO2 cubic lattice and the concentration of oxygen vacancies may not be high enough to form a delocalized impurity band for enhancing the magnetic percolation of Co-doped samples. The XANES spectra at Co L-edges indicate direct Co–Co bond formation in the CeO2 lattices and also a weak bond with O ions. This is in agreement with the magnetic measurements which indicate that Co atoms induce enhancement in magnetic behavior in CeO2 nanostructures.</description><issn>1932-7447</issn><issn>1932-7455</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNo9kMFOwzAQRC0EEqVw4A984Rjw2nGSckOhBaRCECrnaOtsoFViR3Yq8fl1AfW0u9KbWc0wdg3iFoSEu-2ghYZcjydsAjMlkzzV-vS4p_k5uwhhK4RWAtSE_cztN1pDDf9wrk9W1A_kcdx54gvy3vX4ZWnchJ47y0uXPLohsiVVkr-hdQP6cWM6Cvf8lUx0OpBoGz7vyIze2Y35PashYtjxdx_1UULhkp212AW6-p9T9rmYr8rnZFk9vZQPywSh0GNiSGUEbQNG5JLAKNnArMA2F8ZkGcq8bQxAozItUpW1kKViDQJlIWPwtS7UlN38-aIJ9dbtvI3fahD1oa76WJfaA6eJXhg</recordid><startdate>20141120</startdate><enddate>20141120</enddate><creator>Ranjith, Kugalur Shanmugam</creator><creator>Saravanan, Padmanapan</creator><creator>Chen, Shih-Hsien</creator><creator>Dong, Chung-Li</creator><creator>Chen, Chih Liang</creator><creator>Chen, Shih-Yun</creator><creator>Asokan, Kandasami</creator><creator>Rajendra Kumar, Ramasamy Thangavelu</creator><general>American Chemical Society</general><scope/></search><sort><creationdate>20141120</creationdate><title>Enhanced Room-Temperature Ferromagnetism on Co-Doped CeO2 Nanoparticles: Mechanism and Electronic and Optical Properties</title><author>Ranjith, Kugalur Shanmugam ; Saravanan, Padmanapan ; Chen, Shih-Hsien ; Dong, Chung-Li ; Chen, Chih Liang ; Chen, Shih-Yun ; Asokan, Kandasami ; Rajendra Kumar, Ramasamy Thangavelu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a185t-ce36e1fd1c072e1c32d198af70cc66a27fdc11d3650436f1640b10a282745b583</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ranjith, Kugalur Shanmugam</creatorcontrib><creatorcontrib>Saravanan, Padmanapan</creatorcontrib><creatorcontrib>Chen, Shih-Hsien</creatorcontrib><creatorcontrib>Dong, Chung-Li</creatorcontrib><creatorcontrib>Chen, Chih Liang</creatorcontrib><creatorcontrib>Chen, Shih-Yun</creatorcontrib><creatorcontrib>Asokan, Kandasami</creatorcontrib><creatorcontrib>Rajendra Kumar, Ramasamy Thangavelu</creatorcontrib><jtitle>Journal of physical chemistry. C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ranjith, Kugalur Shanmugam</au><au>Saravanan, Padmanapan</au><au>Chen, Shih-Hsien</au><au>Dong, Chung-Li</au><au>Chen, Chih Liang</au><au>Chen, Shih-Yun</au><au>Asokan, Kandasami</au><au>Rajendra Kumar, Ramasamy Thangavelu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Enhanced Room-Temperature Ferromagnetism on Co-Doped CeO2 Nanoparticles: Mechanism and Electronic and Optical Properties</atitle><jtitle>Journal of physical chemistry. C</jtitle><addtitle>J. Phys. Chem. C</addtitle><date>2014-11-20</date><risdate>2014</risdate><volume>118</volume><issue>46</issue><spage>27039</spage><epage>27047</epage><pages>27039-27047</pages><issn>1932-7447</issn><eissn>1932-7455</eissn><abstract>The present study reports the effect of Co doping on the structural, optical, magnetic, and electronic properties of CeO2 nanoparticles (NPs) synthesized by a simple low-temperature co-precipitation method. Co doping was introduced by adding CoCl3 with different mole percentages (0%, 2%, 4%, and 6%) to cerium nitrate, which resulted in room-temperature ferromagnetism (RTFM). TEM and XRD analysis showed that the Co-doped CeO2 NPs are monodispersed with face centered cubic structure. The 6% Co-doped CeO2 NPs showed a coercivity value of 155 Oe and saturation magnetization of 0.028 emu/g at room temperature. The electronic structures of the as-prepared CeO2 and Co-doped CeO2 NPs were investigated by X-ray absorption near-edge structure (XANES) spectroscopy. The XANES spectra at Ce M- and L-edges clearly indicated a decrease in the valency state of Ce ions from Ce4+ to Ce3+ upon Co doping. This causes redistribution of oxygen ions and Co–Co bonding. The XANES study revealed that Co doping plays a prominent role in improving the ferromagnetism, as Co replaces the Ce site in the CeO2 cubic lattice and the concentration of oxygen vacancies may not be high enough to form a delocalized impurity band for enhancing the magnetic percolation of Co-doped samples. The XANES spectra at Co L-edges indicate direct Co–Co bond formation in the CeO2 lattices and also a weak bond with O ions. This is in agreement with the magnetic measurements which indicate that Co atoms induce enhancement in magnetic behavior in CeO2 nanostructures.</abstract><pub>American Chemical Society</pub><doi>10.1021/jp505175t</doi><tpages>9</tpages></addata></record> |
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title | Enhanced Room-Temperature Ferromagnetism on Co-Doped CeO2 Nanoparticles: Mechanism and Electronic and Optical Properties |
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