la060035y_si_001.pdf (69.88 kB)
Photocatalytic Reduction of an Azide-Terminated Self-Assembled Monolayer Using CdS Quantum Dots
journal contribution
posted on 2006-05-23, 00:00 authored by Chander Radhakrishnan, Michael K. F. Lo, Manoj V. Warrier, Miguel A. Garcia-Garibay, Harold G. MonbouquetteOrdered, tightly packed aryl-azide-terminated, self-assembled monolayers (SAMs) were created on gold substrates
from a new disulfide precursor. These monolayers were reduced at least partially in an aqueous environment using
∼2 nm CdS quantum dots (Qdots) as photocatalysts to give mixed monolayers of arylamine- and aryl azide-terminated
species. The CdS photocatalysts were made available for the reaction by exposure of the azide-terminated SAM to
Qdots initially in solution or by preadsorption of the CdS nanoparticles on the SAM. In either case, X-ray photoelectron
spectroscopy (XPS), grazing angle Fourier transform infrared spectroscopy (FTIR), and contact angle measurements
were used to show the occurrence of the photocatalytic reduction. As further evidence for the presence of arylamine-terminated thiolate in the reduced SAM, these arylamine groups were successfully tagged with fluorescein isothiocyanate
(FITC). The use of Qdot photocatalysts to functionalize surfaces may lead to a means to pattern surfaces at the
nanoscale.
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Qdot photocatalystsPhotocatalytic ReductionFTIRfunctionalize surfacesgold substratesspectroscopyarylamine groupsCdS photocatalystsSAMangle FourierCdS nanoparticlesFITCCdS Quantum Dotscontact angle measurementsphotocatalytic reductionXPSfluorescein isothiocyanatemonolayerpattern surfacesdisulfide precursor
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