Synthesis and Magnetic Properties of Nanostructured Metallic Co, Mn and Ni Oxide Materials Obtained from Solid-State Metal-Macromolecular Complex Precursors
The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x), MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 degrees C under air, give nanostructured Mn2O3, Co3O4 and NiO. The polymer acts as a template in the solid state, which is eliminated after the combustion process. At an intermediate stage, a layered graphitic carbon matrix was observed by HRTEM over the grown metal oxides. A mechanism for the growth of nanostructured oxides is discussed, including Raman studies. The nanostructured Mn2O3, Co3O4 and NiO particles grow over graphite layers and the solid-state role of chitosan is crucial for the formation of this graphite substrate. An antiferromagnetic transition was observed in Co3O4 nanoparticles, with T-N = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.
%0 Journal Article
%1 RN362
%A Diaz, C.
%A Valenzuela, M.L.
%A Laguna-Bercero, M.A.
%A Orera, A.
%A Bobadilla, D.
%A Abarca, S.
%A Pena, O.
%D 2017
%J Rsc Advances
%K chemistry, chitosan, co3o4 crystal-structure, decomposition, dqcauchile gold nanocomposites, nanocrystals, nanoparticles, size, supracrystals
%N 44
%P 27729-27736
%R 10.1039/c7ra00782e
%T Synthesis and Magnetic Properties of Nanostructured Metallic Co, Mn and Ni Oxide Materials Obtained from Solid-State Metal-Macromolecular Complex Precursors
%U /brokenurl#<Go to ISI>://WOS:000402166600064
%V 7
%X The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x), MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 degrees C under air, give nanostructured Mn2O3, Co3O4 and NiO. The polymer acts as a template in the solid state, which is eliminated after the combustion process. At an intermediate stage, a layered graphitic carbon matrix was observed by HRTEM over the grown metal oxides. A mechanism for the growth of nanostructured oxides is discussed, including Raman studies. The nanostructured Mn2O3, Co3O4 and NiO particles grow over graphite layers and the solid-state role of chitosan is crucial for the formation of this graphite substrate. An antiferromagnetic transition was observed in Co3O4 nanoparticles, with T-N = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.
@article{RN362,
abstract = {The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x), MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 degrees C under air, give nanostructured Mn2O3, Co3O4 and NiO. The polymer acts as a template in the solid state, which is eliminated after the combustion process. At an intermediate stage, a layered graphitic carbon matrix was observed by HRTEM over the grown metal oxides. A mechanism for the growth of nanostructured oxides is discussed, including Raman studies. The nanostructured Mn2O3, Co3O4 and NiO particles grow over graphite layers and the solid-state role of chitosan is crucial for the formation of this graphite substrate. An antiferromagnetic transition was observed in Co3O4 nanoparticles, with T-N = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.},
added-at = {2019-12-04T03:57:35.000+0100},
author = {Diaz, C. and Valenzuela, M.L. and Laguna-Bercero, M.A. and Orera, A. and Bobadilla, D. and Abarca, S. and Pena, O.},
biburl = {https://www.bibsonomy.org/bibtex/2e36969a24b0a75e064daf4dcb6c21d54/dqcauchile},
doi = {10.1039/c7ra00782e},
interhash = {23b18ad01d93d1b30175150846371713},
intrahash = {e36969a24b0a75e064daf4dcb6c21d54},
issn = {2046-2069},
journal = {Rsc Advances},
keywords = {chemistry, chitosan, co3o4 crystal-structure, decomposition, dqcauchile gold nanocomposites, nanocrystals, nanoparticles, size, supracrystals},
number = 44,
pages = {27729-27736},
timestamp = {2019-12-04T03:58:17.000+0100},
title = {Synthesis and Magnetic Properties of Nanostructured Metallic Co, Mn and Ni Oxide Materials Obtained from Solid-State Metal-Macromolecular Complex Precursors},
type = {Journal Article},
url = {/brokenurl#<Go to ISI>://WOS:000402166600064},
volume = 7,
year = 2017
}