Highly sensitive SERS detection of Pb²⁺ ions in aqueous media using citrate functionalised gold nanoparticles

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• 作者：Mark S. FrostAuthor Vitae ; Michael. J. DempseyAuthor Vitae ; Debra E. Whitehead ; ^{d.whitehead@mmu.ac.uk" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Gold nanosensor ; Citrate ; Lead ; SERS
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2015
• 出版时间：31 December 2015
• 年：2015
• 卷：221
• 期：Complete
• 页码：1003-1008
• 全文大小：1784 K

文摘

Citrate functionalised gold nanoparticles (AuNPs) display strong surface enhanced Raman scattering, which can be used for surface enhanced Raman spectroscopy (SERS). The specific and strong interaction between the heavy metal ions and surface-bound citrate molecules lead to a sensing application for the detection of Pb²⁺ ions. Herein we report a citrate functionalised gold nanoparticle (AuNP) surface enhanced Raman spectroscopy (SERS) based sensor, employing the metal-affinity properties of the citrate molecule to detect Pb²⁺ ions. The Pb²⁺ ions interact with the citrate molecules via their carboxylate and hydroxyl groups altering the molecular spectra pertaining to the ν_as(COO⁻), ν_s(COO⁻) and ν(Crder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">ript>rder="0" alt="single bond" src="http://cdn.els-cdn.com/sd/entities/sbnd" class="glyphImg">ript>OH) bands. The ν(Crder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">ript>rder="0" alt="single bond" src="http://cdn.els-cdn.com/sd/entities/sbnd" class="glyphImg">ript>OH) band was used for the determination of the Pb²⁺ ion concentration. It decreased upon reducing the ion concentration and was found to be linear between 50 ng/L and 1000 ng/L with a 0.9982 correlation coefficient (R²) value. This method also showed good recovery and relative standard deviation (RSD) values.