Publicaciones 2011-2020

@article{RN363,
title = {Effect of the Seed Layer on the Growth and Orientation of the Zno Nanowires: Consequence on Structural Optical Properties},
author = { A. Serrano and A. Arana and A. Gald\'{a}mez and A. Dutt and B.M. Monroy and F. Guell and G. Santana},
url = {/brokenurl#<Go to ISI>://WOS:000416184600065},
doi = {10.1016/j.vacuum.2017.03.010},
issn = {0042-207x},
year = {2017},
date = {2017-01-01},
journal = {Vacuum},
volume = {146},
pages = {509-516},
publisher = {2017 Elsevier Ltd.},
abstract = {High quality vertically aligned zinc oxide (ZnO) nanowires (NWs) were grown on Au-coated aluminum doped zinc oxide (AZO) thin films via vapor-liquid-solid (VLS) technique. AZO seed layers were deposited using two different techniques named as ultrasonic spray pyrolysis (USP) and magnetron sputtering. Structural, morphological and compositional properties of the NWs grown on the two distinct seed layers were analyzed in detail by using X-ray diffraction (XRD), scanning electronic microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques, respectively. In the first case, (seed layer grown by USP technology), NWs showed the (101) orientation, whereas in the second case, (seed layer grown by sputtering) NWs showed (002) orientation. It was confirmed by the SEM images, that NWs with (002) orientation shown better vertical alignment than NWs with (101) orientation. In addition, optical properties were also studied using photoluminescence (PL) spectroscopy and irrespective of the preferred orientation, NWs showed a strong green emission at room temperature. The study made in the present work on the seed layer preparation by two techniques and hence, deposition conditions to achieve fully controllable ZnO nanowires with precise distance, shape, position and orientation could provide opportunities for the fabrication of future optoelectronic devices.},
keywords = {fabrication, layer, luminescence, nanostructures, networks, photoluminescence pressure properties, pyrolysis, seed spray sputtering, temperature, thin-films, ultrasonic zinc-oxide zno},
pubstate = {published},
tppubtype = {article}
}

@article{RN146,
title = {Solvent and Stabilizer Free Growth of Ag and Pd Nanoparticles Using Metallic Salts/Cyclotriphosphazenes Mixtures},
author = { C. Diaz and M.L. Valenzuela and S. Caceres and R. Diaz and C. O'dwyer},
url = {/brokenurl#<Go to ISI>://WOS:000327684100017},
doi = {10.1016/j.matchemphys.2013.08.034},
issn = {0254-0584},
year = {2013},
date = {2013-01-01},
journal = {Materials Chemistry and Physics},
volume = {143},
number = {1},
pages = {124-132},
publisher = {2013 Elsevier B.V.},
abstract = {Cyclotriphosphazene is used as a sacrificial solid-state template to synthesize a range of Ag and Pd nanoparticles with diverse geometries by thermal treatment using MLn/N3P3(O2C12H8)(3) mixtures. The Pd and Ag nanoparticles are synthesized by solid-state pyrolysis of AgPPh3[CF3SO3]/N3P3(O2C12H8)(3) and PdCl2/N3P3(O2C12H8)(3) mixtures with molar relationships of 1:1, 1:5 and 1:10 respectively, in air and at 800 degrees C. The morphology of the as-prepared nanoparticles is found to depend on the molar ratio of the precursor mixture, the preparation method and of the nature of the metal. Ag and Pd, microcrystals were thermally grown on Si from the respective 1:1 precursors while that metal foams were grown from 1:5 ratios precursors on SiO2 wafers. High resolution transmission electron microscopy investigations reveal in most cases small crystals of Pd. HRSTEM measurements indicate that the formation of the Pd and Ag nanoparticles occurs through a phase demixing and dewetting mechanism. This approach has potential to be a useful and facile method to prepare metallic nanoparticles without requiring solutions or surfactants for application in electronic, catalytic and sensor materials and devices.},
keywords = {annealing, derivatives, electron gold, mechanical-behavior, metals, microscopy, nanoparticles, nanorods organometallic palladium polyphosphazenes, precursors, properties, pyrolysis, shape-controlled solid-state surface synthesis, thermolytic transformation},
pubstate = {published},
tppubtype = {article}
}

@article{RN89,
title = {Layered Graphitic Carbon Host Formation During Liquid-Free Solid State Growth of Metal Pyrophosphates},
author = { C. Diaz and M.L. Valenzuela and V. Lavayen and C. O'dwyer},
url = {/brokenurl#<Go to ISI>://WOS:000304728500029},
doi = {10.1021/ic300767h},
issn = {0020-1669},
year = {2012},
date = {2012-01-01},
journal = {Inorganic Chemistry},
volume = {51},
number = {11},
pages = {6228-6236},
abstract = {We report a successful ligand- and liquid-free solid state route to form metal pyrophosphates within a layered graphitic carbon matrix through a single step approach involving pyrolysis of previously synthesized organometallic derivatives of a cyclotriphosphazene. In this case, we show how single crystal Mn2P2O7 can be formed on either the micro- or the nanoscale in the complete absence of solvents or solutions by an efficient combustion process using rationally designed macromolecular trimer precursors, and present evidence and a mechanism for layered graphite host formation. Using in situ Raman spectroscopy, infrared spectroscopy, X-ray diffraction, high resolution electron microscopy, thermogravimetric and differential scanning calorimetric analysis, and near-edge X-ray absorption fine structure examination, we monitor the formation process of a layered, graphitic carbon in the matrix. The identification of thermally and electrically conductive graphitic carbon host formation is important for the further development of this general ligand-free synthetic approach for inorganic nanocrystal growth in the solid state, and can be extended to form a range of transition metals pyrophosphates. For important energy storage applications, the method gives the ability to form oxide and (pyro)phosphates within a conductive, intercalation possible, graphitic carbon as host-guest composites directly on substrates for high rate Li-ion battery and emerging alternative positive electrode materials.},
keywords = {characterization, nanocomposites, nanoparticles, nanotubes, nanowires precursor, pyrolysis, spectroscopic},
pubstate = {published},
tppubtype = {article}
}

@article{RN32i,
title = {Nanostructured Vox/Vo(Po4)(N) Using Solid-State Vanadium Containing Phosphazene Precursors: A Useful Potential Bi-Catalyst System},
author = { C. Diaz and M.L. Valenzuela and N. Yutronic and V. Villalobos and G. Barrera},
url = {/brokenurl#<Go to ISI>://WOS:000297250000012},
doi = {10.1007/s10876-011-0415-1},
issn = {1040-7278},
year = {2011},
date = {2011-01-01},
journal = {Journal of Cluster Science},
volume = {22},
number = {4},
pages = {693-704},
abstract = {Pyrolysis of molecular precursors containing vanadium organometallic and cyclic phosphazene affords mixtures of nanostructured vanadium oxides and pyrophosphates. The products from the molecular precursor [N3P3(OC6H5)(5)OC5H4N center dot Cp2VCl][PF6], and of the mixtures Cp2VCl2/N3P3(OC6H4CHO)(6) and Cp2VCl2/[NP(O2C12H8)](3) in several relationships 1:1, 1:3, 1:5 and 1:10, pyrolyzed under air and at 400 A degrees C and 600 A degrees C, give mixtures mainly V2O5 and VO(PO3)(2). Varied morphologies depending on the molecular or mixture precursors and of the temperature used were observed. Nanowires with diameters of approximate 40 nm were observed for the 1:5 Cp2VCl2/[NP(O2C12H8)](3) mixture pyrolyzed at 400 A degrees C, while the same mixture pyrolyzed at 600 A degrees C, affords xerogels of V2O5. The products were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), infra-red (IR) spectroscopy and X-ray diffraction (XRD). The preparation method constitutes a novel one-pot solid-state way to nanostructured materials with potential applications both in oxidative dehydrogenation of light hydrocarbons with V2O5, as well as alkenes oxidations with VO(PO3)(2).},
keywords = {autogenic cyclophosphazenes, derivatives, electrochemical elevated-temperature, gold, morphology, nanofibres nanoparticles, organometallic polyphosphazenes, pressure, properties, pyrolysis, template, vanadium},
pubstate = {published},
tppubtype = {article}
}