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Direct observation of chemical reactions in silica‐coated gold and silver nanoparticles
Author(s) -
Mulvaney Paul,
Giersig Michael,
Ung Thearith,
LizMarzán Luis M.
Publication year - 1997
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19970090712
Subject(s) - materials science , transmission electron microscopy , particle (ecology) , nanoparticle , nanotechnology , shell (structure) , metal particle , silver nanoparticle , chemical engineering , composite material , oceanography , engineering , geology
The direct observation of chemical reactions of single particles in real time has been achieved using silver nano‐particles covered in a 10 nm silica shell (see cover). Transmission electron micrographs reveal how molecular iodine diffuses through the shell and reacts with Ag, giving AgI. A single AgI particle (mid‐gray) is shown to form on the surface of the silica while the Ag core shrinks.