[en] The optical response of non-spherical gold nanoparticles not only depends on the size of the objects, but also on their
shape and orientation with respect to the polarization direction of the light, exciting the plasmon resonance. This study demonstrates
a method to grow non-spherical gold nanoparticles via organometallic chemical vapor deposition (OMCVD) onto
planar substrates that are covered by SH-terminated self-assembled monolayers (SAMs). Trimethylphosphinegoldmethyl
((CH3)3PAuCH3) is used as the volatile organic precursor. The shape of the deposited particles varies with respect to the
nature of the template SAM: disc-like and pancake shaped nanoparticles are fabricated with different aspect rations between
the two main axes. UV–vis, AFM, STM, SEM and evanescent waveguide absorption spectroscopy (EWAS) of the OMCVD
gold nanoparticles are applied to determine and verify the dimensions and orientation of the nanoparticles in two dimensions.
When clusters of nanoparticles are formed, an additional plasmon band with a large red-shift is observed.
Disciplines :
Chemistry
Author, co-author :
Aliganga, Anne Kathrena A.; Max Planck Institute for Polymer Research > Mainz, Germany
Lieberwirth, Ingo; Max Planck Institute for Polymer Research > Mainz, Germany
Glasser, Gunnar; Max Planck Institute for Polymer Research > Mainz, Germany
Duwez, Anne-Sophie ; Université de Liège - ULiège > Département de chimie (sciences) > Nano-chimie et systèmes moléculaires
Sun, Yingzhi; The University of Western Ontario > London, Canada
Mittler, Silvia; The University of Western Ontario > London, Canada
Language :
English
Title :
Fabrication of equally oriented pancake shaped gold nanoparticles by SAM-templated OMCVD and their optical response
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