Photocatalytic Reduction of an Azide-Terminated Self-Assembled Monolayer Using CdS Quantum Dots Chander Radhakrishnan Michael K. F. Lo Manoj V. Warrier Miguel A. Garcia-Garibay Harold G. Monbouquette 10.1021/la060035y.s001 https://acs.figshare.com/articles/journal_contribution/Photocatalytic_Reduction_of_an_Azide_Terminated_Self_Assembled_Monolayer_Using_CdS_Quantum_Dots/3221344 Ordered, 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. 2006-05-23 00:00:00 Qdot photocatalysts Photocatalytic Reduction FTIR functionalize surfaces gold substrates spectroscopy arylamine groups CdS photocatalysts SAM angle Fourier CdS nanoparticles FITC CdS Quantum Dots contact angle measurements photocatalytic reduction XPS fluorescein isothiocyanate monolayer pattern surfaces disulfide precursor