Differential Adsorption of Gold Nanoparticles to Gold/Palladium and Platinum Surfaces

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• 作者：Corinna Kaulen ; Melanie Homberger ; Svenja Bourone ; Ninet Babajani ; Silvia Karth?user ; Astrid Besmehn ; Ulrich Simon
• 刊名：Langmuir
• 出版年：2014
• 出版时间：January 21, 2014
• 年：2014
• 卷：30
• 期：2
• 页码：574-583
• 全文大小：548K
• ISSN：1520-5827

文摘

Integration of molecule-capped gold nanoparticles (AuNP) into nanoelectronic devices requires detailed knowledge about the AuNP鈥揺lectrode interface. Here, we report the pH-dependent adsorption of amine or carboxylic acid-terminated gold nanoparticles on platinum or gold/palladium (30% Pd) alloy, respectively. We synthesized amine-terminated AuNP, applying a new solid phase supported approach, as well as AuNP exhibiting carboxylic acid as terminal groups. The pH-induced agglomeration of the synthesized AuNP was investigated by UV鈥搗is, DLS, and 味-potential measurements. Depending on the pH and the ionic strength of the AuNP solution a preferential adsorption on the different metals occurred. Thereby, we demonstrate that by choosing the appropriate functional group and adjusting the pH as well as the ionic strength a directed binding can be achieved, which is an essential prerequisite for applications of these particles in nanoelectronics. These findings will pave the way for a controlled designing of the interface between molecule-capped AuNP and metallic electrodes for applications in nanoelectronics.