<?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>S0035-001X2011000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Técnica fotoacústica aplicada a la determinación de propiedades térmicas de muestras de silicio poroso]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giraldo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-García]]></surname>
<given-names><![CDATA[M.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Física ]]></institution>
<addr-line><![CDATA[Bogotá D.C]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Física Aplicada y Tecnología Avanzada Departamento de Nanotecnología]]></institution>
<addr-line><![CDATA[ Querétaro]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>2</numero>
<fpage>99</fpage>
<lpage>105</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La técnica fotoacústica es una técnica que estudia la interacción de la radiación con la materia a través de un fenómeno conocido como efecto fotoacustico. En este trabajo, mediante el ajuste teórico de medidas experimentales de la amplitud de la señal fotoacústica, se determinaron los valores de efusividad térmica efectiva de muestras de silicio poroso crecidas sobre sustratos de silicio tipo-n (100) de diferentes valores de resistividad en el intervalo 1 -25 &#937; cm. Las muestras se fabricaron a temperatura ambiente en un bano electrolítico formado por una mezcla de ácido fluorhídrico al 48 % y etanol absoluto en relación 1:1 en volumen, bajo condición potenciostática (20 V), con un tiempo de ataque de 2 minutos e iluminación trasera mediante un láser con longitud de onda de 808 nm. Los valores obtenidos de la efusividad térmica efectiva de las muestras porosas disminuyeron con respecto al correspondiente valor del silicio monocristalino, esta disminución puede ser atribuida a la restricción del camino libre medio de los fonones de la red en el silicio poroso.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The photoacoustic technique is a technique that studies the radiation-matter interaction through a well-known phenomenon as photoacoustic effect. In this work using a theoretical fitting of the photoacoustic signal amplitude the effective thermal effusivity of porous silicon samples was determined. The porous samples were obtained by means of photoelectrochemical etching of (100) n-type silicon wafers with different resistivity values, all in the range of 1 -25 &#937; cm. The samples were formed at room temperature in an electrolytic bath composed by a mixture of hydrofluoric acid (48 %) and ethanol having a composition ratio of 1:1 in volume under potentiostatic condition (20 V) and an etching time of 2 minutes using back illumination provided by a laser beam with a wavelength of 808nm. The obtained values for the effective thermal effusivity of the porous samples diminished respect to the corresponding value of single-crystalline silicon, this decrease can be attributed to the restriction of the mean free path of phonons in the porous network.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Silicio poroso]]></kwd>
<kwd lng="es"><![CDATA[fotoacústica]]></kwd>
<kwd lng="es"><![CDATA[propiedades térmicas]]></kwd>
<kwd lng="en"><![CDATA[Porous silicon]]></kwd>
<kwd lng="en"><![CDATA[photoacoustic]]></kwd>
<kwd lng="en"><![CDATA[thermal properties]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Carta</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>T&eacute;cnica fotoac&uacute;stica aplicada a la determinaci&oacute;n de propiedades t&eacute;rmicas de muestras de silicio poroso</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A. Guti&eacute;rrez&ordf;, J. Giraldo&ordf; , M.E. Rodr&iacute;guez&#150;Garc&iacute;a<sup>b</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; Departamento de F&iacute;sica, Universidad Nacional de Colombia&#150;Sede Bogot&aacute;, Avenida Carrera 30 No. 45&#150;03, Ciudad Universitaria, Bogot&aacute;, D.C., Colombia, </i>e&#150;mail: <a href="mailto:agutierrezr@unal.edu.co">agutierrezr@unal.edu.co</a></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b </sup> Departamento de Nanotecnolog&iacute;a, Centro de F&iacute;sica Aplicada y Tecnolog&iacute;a Avanzada, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Quer&eacute;taro, 76000, M&eacute;xico, </i>e&#150;mail: <a href="mailto:marioga@fata.unam.mx">marioga@fata.unam.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 8 de marzo de 2010    ]]></body>
<body><![CDATA[<br> Aceptado el 9 de diciembre de 2010</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">La t&eacute;cnica fotoac&uacute;stica es una t&eacute;cnica que estudia la interacci&oacute;n de la radiaci&oacute;n con la materia a trav&eacute;s de un fen&oacute;meno conocido como <i>efecto fotoacustico. </i>En este trabajo, mediante el ajuste te&oacute;rico de medidas experimentales de la amplitud de la se&ntilde;al fotoac&uacute;stica, se determinaron los valores de efusividad t&eacute;rmica efectiva de muestras de silicio poroso crecidas sobre sustratos de silicio tipo&#150;<i>n</i> (100) de diferentes valores de resistividad en el intervalo 1 &#150;25 &#937; cm. Las muestras se fabricaron a temperatura ambiente en un bano electrol&iacute;tico formado por una mezcla de &aacute;cido fluorh&iacute;drico al 48 % y etanol absoluto en relaci&oacute;n 1:1 en volumen, bajo condici&oacute;n potenciost&aacute;tica (20 V), con un tiempo de ataque de 2 minutos e iluminaci&oacute;n trasera mediante un l&aacute;ser con longitud de onda de 808 nm. Los valores obtenidos de la efusividad t&eacute;rmica efectiva de las muestras porosas disminuyeron con respecto al correspondiente valor del silicio monocristalino, esta disminuci&oacute;n puede ser atribuida a la restricci&oacute;n del camino libre medio de los fonones de la red en el silicio poroso.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Silicio poroso; fotoac&uacute;stica; propiedades t&eacute;rmicas.</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">The photoacoustic technique is a technique that studies the radiation&#150;matter interaction through a well&#150;known phenomenon as <i>photoacoustic effect. </i>In this work using a theoretical fitting of the photoacoustic signal amplitude the effective thermal effusivity of porous silicon samples was determined. The porous samples were obtained by means of photoelectrochemical etching of (100) <i>n</i>&#150;type silicon wafers with different resistivity values, all in the range of 1 &#150;25 &#937; cm. The samples were formed at room temperature in an electrolytic bath composed by a mixture of hydrofluoric acid (48 %) and ethanol having a composition ratio of 1:1 in volume under potentiostatic condition (20 V) and an etching time of 2 minutes using back illumination provided by a laser beam with a wavelength of 808nm. The obtained values for the effective thermal effusivity of the porous samples diminished respect to the corresponding value of single&#150;crystalline silicon, this decrease can be attributed to the restriction of the mean free path of phonons in the porous network.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Porous silicon; photoacoustic; thermal properties.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 81.70.Cv; 81.05.Rm; 44.30.+r</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/v57n2/v57n2a1.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>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Este trabajo fue financiado parcialmente por COLCIENCIAS (Colombia), DINAIN&#150;Universidad Nacional de Colombia (Colombia) y Proyecto Papiit 120809, UNAM; proyecto Conacyt 101332, M&eacute;xico. Uno de los autores (A.G.) agradece el apoyo financiero de COLCIENCIAS (Colombia) (Programa Cr&eacute;ditos Condonables para Doctorados Nacionales 2004) y Direcci&oacute;n Nacional de Investigaci&oacute;n DINAIN&#150;Universidad Nacional de Colombia (Colombia) (Contrapartida Programa Cr&eacute;ditos Condonables para Doctorados Nacionales 2004) para realizar sus estudios doctorales.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1.  V. Torres&#150;Costa, F. Agullo&#150;Rueda, R.J. Mart&iacute;n&#150;Palma y J.M. Mart&iacute;nez&#150;Duart, <i>Optical Materials </i><b>27</b> (2005) 1084.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8366647&pid=S0035-001X201100020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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