Functionalized nanoparticles in aqueous surroundings probed by X-ray photoelectron spectroscopy

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• 作者：Johan S&#xf6 ; derstr&#xf6 ; m^a ; ^{Johan.Soderstrom@fysik.uu.se"" rel=""nofollow} ; Niklas Ottosson^a ; Wandared Pokapanich^a ; Gunnar Ö ; hrwall^b ; Olle Bj&#xf6 ; rneholm^a
• 关键词：Nanoparticle ; Soft X-ray ; Photoelectron spectroscopy ; Liquid colloid ; Liquid micro-jet
• 刊名：Journal of Electron Spectroscopy and Related Phenomena
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：184
• 期：7
• 页码：375-378
• 全文大小：347 K

文摘

Abstract

In this paper we present the first core-level photoelectron spectroscopic study of solid nanoparticles in liquid water. The particles are SiO₂-based with an average diameter of 70 nm and functionalized with carboxylic groups. Despite that the sample is very dilute, we show that it is possible to obtain reasonable photoemission signal containing chemical information about both the ligands and the outermost parts of the SiO₂-based core of the nanoparticles. We argue that this is due to a significant enrichment of the dispersed particles at the liquid/vapor interface. This proof-of-principle study expands the field of X-ray photoelectron spectroscopy by adding a new, wide and important class of systems that can be studied.