TY - JOUR
T1 - Kinetic control of interparticle spacing in Au colloid-based surfaces
T2 - Rational nanometer-scale architecture
AU - Grabar, Katherine C.
AU - Smith, Patrick C.
AU - Musick, Michael D.
AU - Davis, Jennifer A.
AU - Walter, Daniel G.
AU - Jackson, Michael A.
AU - Guthrie, Andrea P.
AU - Natan, Michael J.
PY - 1996
Y1 - 1996
N2 - This paper details the kinetic aspects of covalent self-assembly of colloidal Au particles from solution onto immobilized organosilane polymers. On glass substrates, surface formation can be monitored using UV-vis spectroscopy and field emission scanning electron microscopy (FE-SEM). Correlation of these data allows the effect of nanostructure on bulk optical properties to be evaluated. At short derivatization times, particle coverage is proportional to (time)1( 1/2 ). The particle sticking probability p, defined as the ratio of bound particles to the number of particles reaching the surface in a given time period, can be determined from a knowledge of the particle radius, solution concentration, temperature, and solution viscosity; for surfaces derivatized with (3-mercaptopropyl)trimethoxysilane (MPTMS), p ~ 1. At longer derivatization times, interparticle repulsions result in a 'saturation' coverage at ~30% of a close-packed monolayer. Two approaches for modulating the rate of surface formation are described: electrochemical potential control on organosilane-modified SnO2 electrodes and charge screening by organic adsorbates. Self-assembly of colloidal Au particles onto functionalized substrate surfaces is a reproducible phenomenon, as evidenced by UV-vis and surface enhanced Raman scattering (SERS) measurements on identically prepared substrates.
AB - This paper details the kinetic aspects of covalent self-assembly of colloidal Au particles from solution onto immobilized organosilane polymers. On glass substrates, surface formation can be monitored using UV-vis spectroscopy and field emission scanning electron microscopy (FE-SEM). Correlation of these data allows the effect of nanostructure on bulk optical properties to be evaluated. At short derivatization times, particle coverage is proportional to (time)1( 1/2 ). The particle sticking probability p, defined as the ratio of bound particles to the number of particles reaching the surface in a given time period, can be determined from a knowledge of the particle radius, solution concentration, temperature, and solution viscosity; for surfaces derivatized with (3-mercaptopropyl)trimethoxysilane (MPTMS), p ~ 1. At longer derivatization times, interparticle repulsions result in a 'saturation' coverage at ~30% of a close-packed monolayer. Two approaches for modulating the rate of surface formation are described: electrochemical potential control on organosilane-modified SnO2 electrodes and charge screening by organic adsorbates. Self-assembly of colloidal Au particles onto functionalized substrate surfaces is a reproducible phenomenon, as evidenced by UV-vis and surface enhanced Raman scattering (SERS) measurements on identically prepared substrates.
UR - http://www.scopus.com/inward/record.url?scp=0029916618&partnerID=8YFLogxK
U2 - 10.1021/ja952233+
DO - 10.1021/ja952233+
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AN - SCOPUS:0029916618
SN - 0002-7863
VL - 118
SP - 1148
EP - 1153
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 5
ER -