Side Effect of Good’s Buffers on Optical Properties of Gold Nanoparticle Solutions

Michal Wagner, Christian Engelbrekt, Mikkel Undall-Behrend Christiansen, Hans Erik Mølager Christensen, Xiuzhen Qian, Jens Ulstrup, Chongiun Zhao, Jingdong Zhang

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Abstract

In the search of fluorescent nanoclusters for bioimaging, several synthetic methods have been attempted. Particularly, the formation of gold nanoclusters during synthesis of gold nanoparticles (AuNPs) using Good’s buffers has been achieved. Here 2-(N-morpholino) ethanesulfonic acid (MES), 3-(N-morpholino) propanesulfonic acid (MOPS) and 4-(N-morpholino) butanesulfonic acid (MOBS) are chosen Good’s buffers. Resultant AuNP solutions have been subjected to electrochemical investigations along with UV-vis and fluorescent spectroscopies. Distinct absorption features at ca. 290 and 360 nm and fluorescence emission in range of 350-485 nm are observed in filtrated AuNP-free solutions. Notably, electrochemical oxidation of the buffers generates similar optical properties, suggesting that the degradation products of these compounds contribute significantly to the optical properties in AuNP solutions. This work indicates a need for deeper evaluation of fluorescence signals based on metal nanoparticles or nanoclusters.
Original languageEnglish
Publication date2017
Publication statusPublished - 2017
EventForth EuCheMS Inorganic Chemistry Conference (EICC-4) - University of Copenhagen, Southern Campus (KUA), Copenhagen, Denmark
Duration: 2 Jul 20175 Jul 2017

Conference

ConferenceForth EuCheMS Inorganic Chemistry Conference (EICC-4)
LocationUniversity of Copenhagen, Southern Campus (KUA)
CountryDenmark
CityCopenhagen
Period02/07/201705/07/2017

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