RESUMO
We present a method for the preparation and deposition of metallic microstructures and nanostructures deposited on silicon and silica surfaces by pyrolysis in air at 800 degrees C of the corresponding metallophosphazene (cyclic or polymer). Atomic force microscopy studies reveal that the morphology is dependent on the polymeric or oligomeric nature of the phosphazene precursor, on the preparation method used, and on the silicon substrate surface (crystalline or amorphous) and its prior inductively couple plasma etching treatment. Microscale and nanoscale structures and high-surface-area thin films of gold, palladium, silver, and tin were successfully deposited from their respective newly synthesized precursors. The characteristic morphology of the deposited nanostructures resulted in varied roughness and increased surface area and was observed to be dependent on the precursor and the metal center. In contrast to island formation from noble metal precursors, we also report a coral of SnP(2)O(7) growth on Si and SiO(2) surfaces from the respective Sn polymer precursor, leaving a self-affine fractal structure with a well-defined roughness exponent that appears to be independent (within experimental error) of the average size of the islands. The nature of the precursor will be shown to influence the degree of surface features, and the mechanism of their formation is presented. The method reported here constitutes a new route to the deposition of single-crystal metallic, oxidic, and phosphate nanostructures and thin films on technologically relevant substrates.
RESUMO
El presente estudio se realizo en el laboratorio de Ciencias Experimentales del Centro Universitario de Cuautitlan Izcalli (CUCI) utilizando medicamentos homeopaticos indicados en la desnutricion (Natrum muriatico, Phosphoro, Silicea terra, Zincum metallicum) a la sexta centesimal aplicados a semillas de lenteja, confirmando que los medicamentos homeopaticos no tienen efecto placebo, y reforazando su base para prescribir n la ley de semejanetes, pues cada medicamento genera caracteristicas particulares que ademas fortalece a la individualidad morbosa y medicamentosa.
Assuntos
Fabaceae/crescimento & desenvolvimento , Germinação , Terapêutica Homeopática , Sementes/crescimento & desenvolvimentoRESUMO
El presente estudio se realizo en el laboratorio de Ciencias Experimentales del Centro Universitario de Cuautitlan Izcalli (CUCI) utilizando medicamentos homeopaticos indicados en la desnutricion (Natrum muriatico, Phosphoro, Silicea terra, Zincum metallicum) a la sexta centesimal aplicados a semillas de lenteja, confirmando que los medicamentos homeopaticos no tienen efecto placebo, y reforazando su base para prescribir n la ley de semejanetes, pues cada medicamento genera caracteristicas particulares que ademas fortalece a la individualidad morbosa y medicamentosa. (AU)