<?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>2007-8196</journal-id>
<journal-title><![CDATA[Epistemus (Sonora)]]></journal-title>
<abbrev-journal-title><![CDATA[Epistemus (Sonora)]]></abbrev-journal-title>
<issn>2007-8196</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Sonora, División de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-81962023000200007</article-id>
<article-id pub-id-type="doi">10.36790/epistemus.v17i35.315</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Optimizing Surface-Enhanced Raman Spectroscopy Substrates with Gold Nanospheres, Nanorods and Nanostars]]></article-title>
<article-title xml:lang="es"><![CDATA[Optimizando sustratos de espectroscopía Raman mejorada en superficie con nanoesferas, nanorodillos y nanoestrellas de oro]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santacruz-Gomez]]></surname>
<given-names><![CDATA[K.J]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Durazo]]></surname>
<given-names><![CDATA[V.H]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez Félix]]></surname>
<given-names><![CDATA[S.J]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez Velasquez]]></surname>
<given-names><![CDATA[A.V]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángulo-Molina]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sonora Departamento de Física ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sonora Departamento de Ciencias Químico-Biológicas ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Sonora Departamento de Ciencias Químico Biológicas ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Sonora Departamento de Ciencias Químico Biológicas ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Sonora Departamento de Ciencias Químico-Biológicas ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>17</volume>
<numero>35</numero>
<fpage>7</fpage>
<lpage>15</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-81962023000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-81962023000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-81962023000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Surface-Enhanced Raman Spectroscopy is a powerful technique that boosts the distinctive fingerprint signals of molecules, making them more accessible for analysis. It utilizes metallic nanoparticles, acting as amplifiers, to greatly enhance the signals emitted by the molecules. This study aimed to explore the SERS potential of gold nanoparticles (AuNPs) with different geometries using a non-resonant molecule, 4-MBA. Nanospheres (14±2 nm), nanorods (11±2 nm x 50±7 nm) and nanostars (38±4 nm) were synthesized via the HAuCl4 reduction method. All three AuNP geometries exhibited a remarkable enhancement of the Raman signal of 4-MBA by a magnitude of 104. Notably, only gold nanorods and nanostars displayed localized surface plasmon within the biological window, making them highly suitable for biological sample analysis. Meanwhile, the application of gold nanospheres should be limited to chemical SERS detection. These findings confirm the potential use of these nanostructures as SERS substrates for studying molecules with low molar absorption coefficients and low or zero quantum yield.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La Espectroscopía Raman Mejorada en Superficie es una potente técnica que realza las señales distintivas de huella dactilar de las moléculas, haciéndolas más accesibles para su análisis. Utiliza nanopartículas metálicas, que actúan como amplificadores para mejorar, en gran medida, las señales emitidas por las moléculas. Este estudio tuvo como objetivo explorar el potencial de SERS de nanopartículas de oro (AuNPs) con diferentes geometrías utilizando una molécula no resonante, el 4-MBA. Se sintetizaron nanoesferas (14 ± 2 nm), nanorrodillos (11 ± 2 nm x 50 ± 7 nm) y nanoestrellas (38 ± 4 nm) mediante el método de reducción de HAuCl4. Las tres geometrías de AuNP mostraron una mejora notable en la señal Raman del 4-MBA en una magnitud de 104. Es importante destacar que solo los nanorrodillos y las nanoestrellas de oro presentaron resonancia de plasmón superficial localizada dentro de la ventana biológica, lo que las hace altamente adecuadas para el análisis de muestras biológicas. Mientras tanto, la aplicación de nanoesferas de oro debería limitarse a la detección química de SERS. Estos hallazgos confirman el potencial uso de estas nanoestructuras como sustratos de SERS para estudiar moléculas con coeficientes de absorción molar bajos y rendimiento cuántico bajo o nulo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Gold nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[localized surface plasmon]]></kwd>
<kwd lng="en"><![CDATA[SERS, non-resonant molecule]]></kwd>
<kwd lng="es"><![CDATA[Nanoparticulas de oro]]></kwd>
<kwd lng="es"><![CDATA[Plasmon de superficie localizado]]></kwd>
<kwd lng="es"><![CDATA[SERS]]></kwd>
<kwd lng="es"><![CDATA[moléculas no resonantes]]></kwd>
</kwd-group>
</article-meta>
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