Tandem X-ray absorption spectroscopy and scattering forin situtime-resolved monitoring of gold nanoparticle mechanosynthesis

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http://hdl.handle.net/10138/332691

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de Oliveira , P F M , Michalchuk , A A L , Buzanich , A G , Bienert , R , Torresi , R M , Camargo , P H C & Emmerling , F 2020 , ' Tandem X-ray absorption spectroscopy and scattering forin situtime-resolved monitoring of gold nanoparticle mechanosynthesis ' , Chemical Communications , vol. 56 , no. 71 , pp. 10329-10332 . https://doi.org/10.1039/d0cc03862h

Title: Tandem X-ray absorption spectroscopy and scattering forin situtime-resolved monitoring of gold nanoparticle mechanosynthesis
Author: de Oliveira, Paulo F. M.; Michalchuk, Adam A. L.; Buzanich, Ana Guilherme; Bienert, Ralf; Torresi, Roberto M.; Camargo, Pedro H. C.; Emmerling, Franziska
Contributor: University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
Date: 2020-09-14
Language: eng
Number of pages: 4
Belongs to series: Chemical Communications
ISSN: 1359-7345
URI: http://hdl.handle.net/10138/332691
Abstract: Current time-resolvedin situapproaches limit the scope of mechanochemical investigations possible. Here we develop a new, general approach to simultaneously follow the evolution of bulk atomic and electronic structure during a mechanochemical synthesis. This is achieved by coupling two complementary synchrotron-based X-ray methods: X-ray absorption spectroscopy (XAS) and X-ray diffraction. We apply this method to investigate the bottom-up mechanosynthesis of technologically important Au micro and nanoparticles in the presence of three different reducing agents, hydroquinone, sodium citrate, and NaBH4. Moreover, we show how XAS offers new insight into the early stage generation of growth species (e.g.monomers and clusters), which lead to the subsequent formation of nanoparticles. These processes are beyond the detection capabilities of diffraction methods. This combined X-ray approach paves the way to new directions in mechanochemical research of advanced electronic materials.
Subject: IN-SITU
MECHANOCHEMICAL SYNTHESIS
NANOMATERIALS
DIFFRACTION
CATALYSIS
GROWTH
TIME
116 Chemical sciences
221 Nano-technology
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