Journal
NANOSCALE ADVANCES
Volume 1, Issue 4, Pages 1331-1336Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8na00302e
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Funding
- Korean National Research Foundation [2015R1A2A1A15055721, 2018R1D1A1B07050171]
- NRF [2015R1D1A1A01057710, 2018R1D1A1B07046393]
- National Research Foundation of Korea [2015R1D1A1A01057710, 2018R1D1A1B07050171, 2018R1D1A1B07046393, 2015R1A2A1A15055721] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Polyethyleneimine ( PEI)- stabilized gold nanoparticles were used as a model to understand the roles of ionic precursors in the formation of nanoparticles and the impact of their presence on the nanoparticle properties. The low availability of elemental gold and the stabilization of the just- generated gold nanoparticles by the excess gold ions contributed to the production of ultra- small nearly neutral gold nanoparticles, resulting in properties significantly different from those prepared by conventional methods. The cross- linking between gold ions/ PEI/ nanoparticles further led to the assembly of these small gold nanoparticles into suprananoparticles that were stable in water. The hygroscopic Au( III) residues in the suprananoparticles absorbed moisture to form a micro- water pool and the nanoparticles in the new aqueous solution reshuffled to generate larger nanoparticles, leading to significant changes in their optical properties. Such a phenomenon was formulated into a fast, sensitive and straightforward method for the detection of water content in organic solvents.
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