Adsorption of CdSe Nanoparticles to Thiolated TiO2 Surfaces: Influence of Intralayer Disulfide Formation on CdSe Surface Coverage
Citations Over TimeTop 10% of 2007 papers
Abstract
Mixed monolayers of hexadecanoic acid (HDA) and 16-mercaptohexadecanoic acid (MHDA) were adsorbed to nanocrystalline TiO2 films, and CdSe nanoparticles were attached to the mixed monolayer functionalized surfaces. IR absorption spectroscopy was used to characterize the equilibrium binding of HDA and MHDA to TiO2. Surface adduct formation constants (Kad) of (4+/-2)x10(3) M(-1) and (6+/-4)x10(3) M(-1) were measured for HDA and MHDA, respectively. CdSe nanoparticles were adsorbed to the terminal thiol groups of MHDA. The surface coverage of CdSe was greater on mixed monolayers, consisting of approximately 12% MHDA and 88% HDA, than on pure MHDA monolayers. A mechanism is proposed wherein intralayer disulfide formation between MHDA thiol groups causes decreased reactivity toward CdSe nanoparticles. Disulfide formation is less significant at low fractional surface coverages of MHDA. The mechanism is supported by an increase of CdSe adsorption upon chemical reduction of surface disulfides to thiols. Our findings highlight the effect of intermolecular interactions on the affinity of nanoparticles for monolayer-functionalized surfaces.
Related Papers
- → DFT study of Cu-modified and Cu-embedded WSe2 monolayers for cohesive adsorption of NO2, SO2, CO2, and H2S(2022)72 cited
- → The Adsorption behaviors of pristine MoS2 and N-MoS2 Monolayer: A First-Principles Calculation(2021)23 cited
- → Adsorption mechanism of typical VOCs on pristine and Al-modified MnO2 monolayer(2020)33 cited
- → Adsorption mechanism of hydrogen sulfide and sulfur dioxide on Au–MoS2 monolayer(2019)16 cited
- Susquehanna Chorale Spring Concert "Roots and Wings"(2017)