<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2007000300007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Bimetallic Pd-Pt films prepared by MOCV]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martinez Guerrero]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacios]]></surname>
<given-names><![CDATA[E.G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas Garcia]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santes Hernández]]></surname>
<given-names><![CDATA[V.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto Guzman]]></surname>
<given-names><![CDATA[A.B.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramirez Meneses]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,ESIQIE-IPN Depto. de Ingeniería Metalúrgica ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>MÉXICO</country>
</aff>
<aff id="A02">
<institution><![CDATA[,IPN  ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>MÉXICO</country>
</aff>
<aff id="A03">
<institution><![CDATA[,CINVESTAV-IPN Depto. de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>MÉXICO</country>
</aff>
<aff id="A04">
<institution><![CDATA[,CICATA-IPN  ]]></institution>
<addr-line><![CDATA[Altamira Tamaulipas]]></addr-line>
<country>MÉXICO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<numero>3</numero>
<fpage>194</fpage>
<lpage>197</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Bimetallic Pd-Pt films have been prepared on amorphous planar substrates by MOCVD using metal-acetylacetonate precursors. The effects of the MOCVD experimental conditions on the surface morphology, crystallite size and chemical composition of the bimetallic films have been analyzed. X-ray diffraction results show that bimetallic films consist of Pd-Pt solid solutions of variable composition depending on the initial metallic content in the inlet gases. Thus Pd-rich films can be obtained as preferred for the catalysts industry. The surface morphology of the bimetallic films varied from smooth to rough surfaces with the increase in total pressure. The crystallite size in the bimetallic films varies from 40 to 100 nm. Therefore, the MOCVD technique could be considered to be a viable alternative route for the preparation of bimetallic Pd-Pt films, which are in demand in the technology of supported bimetallic catalysts.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se prepararon películas bimetálicas Pd-Pt sobre substratos amorfos por medio de la técnica MOCVD usando acetilacetonatos-metálicos como precursores. Se estudiaron los efectos de las condiciones experimentales MOCVD sobre la morfología superficial, tamaño de cristal y composición química de las películas bimetálicas. Los resultados de difracción de rayos X muestran que las películas bimetálicas consisten de soluciones sólidas Pd-Pt de composición variable dependiendo del contenido metálico inicial en el gas de alimentación. De esta forma, se pueden obtener películas ricas en paladio, las cuales son requeridas en la industria catalítica. La morfología superficial de las películas bimetálicas varía de una superficie suave a una superficie rugosa con el incremento de la presión total. El tamaño de cristal en las películas bimetálicas varía de 40 a 100 nm. Así, la técnica MOCVD puede ser considerada una ruta alterna viable para la preparación de películas bimetálicas Pd-Pt, las cuales tienen demanda en el desarrollo tecnológico de catalizadores bimetálitos soportados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[MOCVD]]></kwd>
<kwd lng="en"><![CDATA[thin films]]></kwd>
<kwd lng="en"><![CDATA[bimetallic Pd-Pt]]></kwd>
<kwd lng="es"><![CDATA[MOCVD]]></kwd>
<kwd lng="es"><![CDATA[películas delgadas]]></kwd>
<kwd lng="es"><![CDATA[películas bimetálicas Pd-Pt]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Bimetallic Pd&#150;Pt films prepared by MOCV</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>R. Martinez Guerrero&ordf;, E.G. Palacios&ordf;,  J.R. Vargas Garcia&ordf;, V.F. Santes Hern&aacute;ndez<sup>b</sup>, A.B. Soto Guzman<sup>c</sup>, E. Ramirez Meneses<sup>d</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Depto. de Ingenier&iacute;a Metal&uacute;rgica, ESIQIE&#150;IPN, M&eacute;xico 07300, D.F. M&Eacute;XICO, e&#150;mail: <a href="mailto:remague@yahoo.com">remague@yahoo.com</a>, <a href="mailto:epalacios@ipn.mx">epalacios@ipn.mx</a>, <a href="mailto:rvargasga@ipn.mx">rvargasga@ipn.mx</a></i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Miguel Othon de Mendizabal 485, M&eacute;xico 07700, D.F., M&Eacute;XICO, e&#150;mail: <a href="mailto:vsantes@ipn.mx">vsantes@ipn.mx</a></i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Depto. de F&iacute;sica, CINVESTAV&#150;IPN, Apartado Postal 14&#150;740, 07000, M&eacute;xico D.F., M&Eacute;XICO, e&#150;mail: <a href="mailto:anabertha90@hotmail.com">anabertha90@hotmail.com</a></i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>d</sup> CICATA&#150;IPN, Km 14.5 Carretera Tampico &#150; Puerto Altamira, 89600 Altamira, Tamaulipas, M&Eacute;XICO, e&#150;mail: <a href="mailto:esthervincent@yahoo.com">esthervincent@yahoo.com</a></i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 8 de febrero de 2007    <br> Aceptado el 18 de abril de 2007</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Bimetallic Pd&#150;Pt films have been prepared on amorphous planar substrates by MOCVD using metal&#150;acetylacetonate precursors. The effects of the MOCVD experimental conditions on the surface morphology, crystallite size and chemical composition of the bimetallic films have been analyzed. X&#150;ray diffraction results show that bimetallic films consist of Pd&#150;Pt solid solutions of variable composition depending on the initial metallic content in the inlet gases. Thus Pd&#150;rich films can be obtained as preferred for the catalysts industry. The surface morphology of the bimetallic films varied from smooth to rough surfaces with the increase in total pressure. The crystallite size in the bimetallic films varies from 40 to 100 nm. Therefore, the MOCVD technique could be considered to be a viable alternative route for the preparation of bimetallic Pd&#150;Pt films, which are in demand in the technology of supported bimetallic catalysts.</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Keywords:  </i></b>MOCVD; thin films; bimetallic Pd&#150;Pt.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se prepararon pel&iacute;culas bimet&aacute;licas Pd&#150;Pt sobre substratos amorfos por medio de la t&eacute;cnica MOCVD usando acetilacetonatos&#150;met&aacute;licos como precursores. Se estudiaron los efectos de las condiciones experimentales MOCVD sobre la morfolog&iacute;a superficial, tama&ntilde;o de cristal y composici&oacute;n qu&iacute;mica de las pel&iacute;culas bimet&aacute;licas. Los resultados de difracci&oacute;n de rayos X muestran que las pel&iacute;culas bimet&aacute;licas consisten de soluciones s&oacute;lidas Pd&#150;Pt de composici&oacute;n variable dependiendo del contenido met&aacute;lico inicial en el gas de alimentaci&oacute;n. De esta forma, se pueden obtener pel&iacute;culas ricas en paladio, las cuales son requeridas en la industria catal&iacute;tica. La morfolog&iacute;a superficial de las pel&iacute;culas bimet&aacute;licas var&iacute;a de una superficie suave a una superficie rugosa con el incremento de la presi&oacute;n total. El tama&ntilde;o de cristal en las pel&iacute;culas bimet&aacute;licas var&iacute;a de 40 a 100 nm. As&iacute;, la t&eacute;cnica MOCVD puede ser considerada una ruta alterna viable para la preparaci&oacute;n de pel&iacute;culas bimet&aacute;licas Pd&#150;Pt, las cuales tienen demanda en el desarrollo tecnol&oacute;gico de catalizadores bimet&aacute;litos soportados.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Descriptores: </i></b>MOCVD; pel&iacute;culas delgadas; pel&iacute;culas bimet&aacute;licas Pd&#150;Pt. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 81.15.Gh;81.05.&#150;t</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53n3/v53n3a7.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">This study was supported by the National Polytechnic Institute (IPN) of Mexico through the project SIP&#150;IPN 20051130. One of the authors (R. Martinez Guerrero) would like to express his gratitude to the IPN and CONACYT for the financial support of his doctoral studies.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     ]]></body>
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