Publicaciones 2011-2020

@article{RN395,
title = {Solution, Solid-State Two Step Synthesis and Optical Properties of Zno and Sno2 Nanoparticles and Their Nanocomposites with Sio2},
author = { C. Diaz and M.L. Valenzuela and M. Segovia and K. Correa and R. De La Campa and A.P. Soto},
url = {/brokenurl#<Go to ISI>://WOS:000425608200006},
doi = {10.1007/s10876-017-1324-8},
issn = {1040-7278},
year = {2018},
date = {2018-01-01},
journal = {Journal of Cluster Science},
volume = {29},
number = {2},
pages = {251-266},
abstract = {Nanostructure luminescent ZnO and SnO2 materials are prepared by a two-step solid-state method based on the solution preparation of the macromolecular precursors ZnCl2 center dot Chitosan and SnCl2 center dot Chitosan having different ratios (1:1, 1:5 and 1:10), their pyrolysis under air at 800 A degrees C. The pyrolytic ZnO and SnO2 nanomaterials show a dependence of the particle size, morphology and luminescent properties with the ratio [metal/polymer] in the MCl2 center dot Chitosan precursors. Thus, ZnO semiconductor materials exhibit luminescence spectra with several emission at 440 nm corresponds to a radiative transition of an electron from the shallow donor level of oxygen vacancies, and the zinc interstitial, to the valence band. On the other hand, the photoluminescence spectrum of the nanostructured SnO2 shows an intense blue luminescence at a wavelength of 420 nm which may be attributed to oxygen-related defects that have been introduced during the growth process of the nanoparticles. Additionally, whereas SnO2 was successfully incorporated into SiO2 structure (SnO2//SiO2) by pyrolysis of solid-state mixtures of the precursors SnCl2 center dot Chitosan in the presence of SiO2, the same reaction carried out with ZnCl2 center dot Chitosan precursors led to a mixture of Zn2SiO4 and SiO2. Thus, this new methodology yields nanostructured semiconductor materials, ZnO and SnO2, suitable for optoelectronic and sensor solid-state devices.},
keywords = {center chitin, chitosan, crystal-structure, dot fine-structure, kinetics, mechanisms, nanostructures, photoluminescence, sio2, size sno2 solid-state synthesis, zinc-oxide, zno},
pubstate = {published},
tppubtype = {article}
}

@article{RN360,
title = {Solid-State Synthesis of Pure and Doped Lanthanide Oxide Nanomaterials by Using Polymer Templates. Study of Their Luminescent Properties},
author = { C. Diaz and M.L. Valenzuela and C. Garcia and R. De La Campa and A.P. Soto},
url = {/brokenurl#<Go to ISI>://WOS:000413124300029},
doi = {10.1016/j.matlet.2017.07.112},
issn = {0167-577x},
year = {2017},
date = {2017-01-01},
journal = {Materials Letters},
volume = {209},
pages = {111-114},
publisher = {2017 Elsevier B.V.},
abstract = {We herein reports the solid-state synthesis of pure and doped lanthanide oxides by using polymeric materials (chitosan and polystyrene-co-poly(4-vinylpyridine), PS-co-P4VP) as a solid template. Lanthanide nanomaterials are prepared in two-step methodology combining both solution and solid procedures. The first involves the synthesis of macromolecular complexes Chitosan.[M(NO3)(3)//M'(NO3)(3)] and PS-co-P4VP.[M(NO3)(3)//M'(NO3)(3)] (M = La, Pr; M' = Eu); and the second consists in the pyrolysis at 800 degrees C of the as-prepared solid macromolecular complexes. The pyrolytic products were characterized by X-ray diffraction, SEM-EDS, TEM, and HR-TEM. Whereas similar particle size distribution in average (ca. 25 nm) was observed with both polymer templates, a higher degree of crystallinity was obtained by using PS-co-P4VP. Importantly, the emission luminescent intensity of the doped pyrolytic oxides, La2O3//Eu2O3 and PrO1,83//Eu2O3, is not quenched despite the presence of dopant. Thus, the as-prepared doped oxides exhibit an enhanced Eu3+ emission originated from the D-5(0) -> F-7(n) (n = 1, 2, 3, 4) transitions, which is more intense for the PS-co-P4VP template. This synthetic methodology base on the pyrolysis of polymeric complexes can be considered as a general and straightforward methodology leading to pure and Eu3+-doped nanostructured lanthanide oxide.},
keywords = {chitosan, europium-doped, facile lanthanide nanocrystals, oxide, polymer-templated, scale supracrystals, synthesis, y2o3-eu},
pubstate = {published},
tppubtype = {article}
}

@article{RN362,
title = {Synthesis and Magnetic Properties of Nanostructured Metallic Co, Mn and Ni Oxide Materials Obtained from Solid-State Metal-Macromolecular Complex Precursors},
author = { C. Diaz and M.L. Valenzuela and M.A. Laguna-Bercero and A. Orera and D. Bobadilla and S. Abarca and O. Pena},
url = {/brokenurl#<Go to ISI>://WOS:000402166600064},
doi = {10.1039/c7ra00782e},
issn = {2046-2069},
year = {2017},
date = {2017-01-01},
journal = {Rsc Advances},
volume = {7},
number = {44},
pages = {27729-27736},
abstract = {The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x)},
keywords = {chemistry, chitosan, co3o4 crystal-structure, decomposition, gold nanocomposites, nanocrystals, nanoparticles, size, supracrystals},
pubstate = {published},
tppubtype = {article}
}