<?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>S0035-001X2006000800003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[CO sensitivity of undoped-ZnO, Cr-ZnO and Cu-ZnO thin films obtained by spray pyrolysis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Vidal]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de la L. Olvera]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Barranca]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meléndez-Lira]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo C.I.T.I.S. ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,CINVESTAV-IPN Depto. de Ingeniería Eléctrica ]]></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>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<fpage>6</fpage>
<lpage>10</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2006000800003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2006000800003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2006000800003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this work, we present the gas-sensing properties of chemically sprayed undoped (ZnO), copper-doped (Cu-ZnO), and chromium-doped ZnO thin films (Cr-ZnO), in an atmosphere of carbon monoxide, CO. Films were deposited at 400°C, using zinc acetylacetonate as zinc precursor. Three different atomic concentration ratios of the dopant were tested. A maximum sensitivity of the order of four orders of magnitude was obtained at measurement temperatures of 200 and 300°C in an atmosphere containing 100 ppm of CO. It was found that chromium doping favors a higher sensitivity at lower measurement temperatures (200°C), whereas the best sensitivity appears in copper-doped ZnO films at higher measurement temperatures (300° C). The thinnest films exhibited higher sensitivities.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo presentamos las propiedades sensoras de películas delgadas de óxido de zinc sin dopar (ZnO) y dopadas con cromo (Cr-ZnO) o cobre (Cu-ZnO) en una atmósfera de monóxido de carbono, CO. Las películas fueron depositadas a 400° C, usando acetyl-acetonato de zinc como fuente del zinc. Tres diferentes concentraciones de dopante fueron utilizadas. Una sensibilidad máxima del orden de cuatro ordenes de magnitud fue obtenida a temperaturas de medición de 200 y 300° C, para las películas dopadas con Cr y Cu, respectivamente, en una atmósfera de CO a una concentración de 100 ppm. Las películas impurificadas con Cr mostraron su máxima sensibilidad a temperaturas más bajas (200°C) respecto a las películas impurificadas con Cu, las cuales presentaron su máxima sensibilidad a 300°C. Las películas más delgadas siempre mostraron mayor sensibilidad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Zinc oxide]]></kwd>
<kwd lng="en"><![CDATA[thin films]]></kwd>
<kwd lng="en"><![CDATA[gas sensor]]></kwd>
<kwd lng="en"><![CDATA[carbon monoxide]]></kwd>
<kwd lng="es"><![CDATA[Oxido de zinc]]></kwd>
<kwd lng="es"><![CDATA[películas delgadas]]></kwd>
<kwd lng="es"><![CDATA[sensor de gases]]></kwd>
<kwd lng="es"><![CDATA[monóxido de carbono]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>CO sensitivity of undoped&#150;ZnO, Cr&#150;ZnO and Cu&#150;ZnO thin films obtained by spray pyrolysis</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J.L. Gonz&aacute;lez&#150;Vidal &ordf;, M. de la L. Olvera<sup>b</sup>, A. Maldonado<sup>b</sup>, A. Reyes&#150;Barranca<sup>b</sup> and M. Mel&eacute;ndez&#150;Lira<sup>c</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; C.I.T.I.S. Universidad Aut&oacute;noma del Estado de Hidalgo, Carretera Pachuca&#150;Tulancingo Km. 4.5, Pachuca, Hidalgo, 42076, M&eacute;xico, e&#150;mail:</i> <a href="mailto:jolvidal@yahoo.com.mx">jolvidal@yahoo.com.mx</a></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Depto. de Ingenier&iacute;a El&eacute;ctrica, CINVESTAV&#150;IPN, Apartado Postal 14&#150;740, M&eacute;xico D.F. 07000, M&eacute;xico</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Depto. de F&iacute;sica, CINVESTAV&#150;IPN, </i><i>Apartado Postal 14&#150;740, M&eacute;xico D.F. 07000, M&eacute;xico</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 27 de octubre de 2004    <br> Aceptado el 26 de mayo de 2005</font></p>     ]]></body>
<body><![CDATA[<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">In this work, we present the gas&#150;sensing properties of chemically sprayed undoped (ZnO), copper&#150;doped (Cu&#150;ZnO), and chromium&#150;doped ZnO thin films (Cr&#150;ZnO), in an atmosphere of carbon monoxide, CO. Films were deposited at 400&deg;C, using zinc acetylacetonate as zinc precursor. Three different atomic concentration ratios of the dopant were tested. A maximum sensitivity of the order of four orders of magnitude was obtained at measurement temperatures of 200 and 300&deg;C in an atmosphere containing 100 ppm of CO. It was found that chromium doping favors a higher sensitivity at lower measurement temperatures (200&deg;C), whereas the best sensitivity appears in copper&#150;doped ZnO films at higher measurement temperatures (300&deg; C). The thinnest films exhibited higher sensitivities.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Zinc oxide; thin films; gas sensor; carbon monoxide.</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">En este trabajo presentamos las propiedades sensoras de pel&iacute;culas delgadas de &oacute;xido de zinc sin dopar (ZnO) y dopadas con cromo (Cr&#150;ZnO) o cobre (Cu&#150;ZnO) en una atm&oacute;sfera de mon&oacute;xido de carbono, CO. Las pel&iacute;culas fueron depositadas a 400&deg; C, usando acetyl&#150;acetonato de zinc como fuente del zinc. Tres diferentes concentraciones de dopante fueron utilizadas. Una sensibilidad m&aacute;xima del orden de cuatro ordenes de magnitud fue obtenida a temperaturas de medici&oacute;n de 200 y 300&deg; C, para las pel&iacute;culas dopadas con Cr y Cu, respectivamente, en una atm&oacute;sfera de CO a una concentraci&oacute;n de 100 ppm. Las pel&iacute;culas impurificadas con Cr mostraron su m&aacute;xima sensibilidad a temperaturas m&aacute;s bajas (200&deg;C) respecto a las pel&iacute;culas impurificadas con Cu, las cuales presentaron su m&aacute;xima sensibilidad a 300&deg;C. Las pel&iacute;culas m&aacute;s delgadas siempre mostraron mayor sensibilidad.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Oxido de zinc; pel&iacute;culas delgadas; sensor de gases; mon&oacute;xido de carbono.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 68.55.&#150;a; 68.55.Jk; 82.65.&#150;I; 82.65.My</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v52s2/v52s2a3.pdf">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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">The authors wish to thank M. A. Luna&#150;Arias, A. Palafox, and R. Fragoso for their technical support. This work was supported by the Conacyt through the contract numbers 39487&#150;Y and 41251&#150;A.</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>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. T. Schwebel, M. Fleicher, H. Meixner, and C.D. 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