Dithizone Modified Gold Nanoparticles Films for Potentiometric Sensing

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• 作者：Emilia Wo藕nica ; Micha艂 M. W贸jcik ; Marcin Wojciechowski ; J贸zef Mieczkowski ; Ewa Bulska ; Krzysztof Maksymiuk ; Agata Michalska
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：May 15, 2012
• 年：2012
• 卷：84
• 期：10
• 页码：4437-4442
• 全文大小：280K
• 年卷期：v.84,no.10(May 15, 2012)
• ISSN：1520-6882

文摘

For the first time, application of a membrane composed of gold nanoparticles decorated with complexing ligand for potentiometric sensing is shown. Gold nanoparticles drop cast from a solution form a porous structure on a substrate electrode surface. Sample cations can penetrate the gold nanoparticles layer and interact with ligand acting as a charged ionophore, resulting in Nernstian potentiometric responses. Anchoring of complexing ligand on the gold surface abolishes the necessity of ionophore application. Moreover, it opens the possibility of preparation of potentiometric sensors using chelators of significantly different selectivity patterns further enhanced by the absence of polymeric membrane matrix. This was clearly seen, for example, for gold nanoparticles stabilizing the applied ligand鈥揹ithizone鈥搕hiol conformation leading to a high potentiometric selectivity toward copper ions, much higher than that of ionophores typically used to induce selectivity for polymeric ion-selective membranes.