NMR studies of the surface structure and dynamics of semiconductor nanocrystals

Structure elucidation of nanoparticle-bound organic molecules by 1H NMR

“…It is possible to study the surface-bound molecules on these nanoparticles directly using 1 H NMR. 1 H NMR studies of thiophenol-coated cadmium sulfide (CdS) QDs were reported [32,33]. Using the shell model of Lippens and Lannoo [34] to predict the number of Cd atoms, the coverage of thiophenol molecules was calculated.…”

Electroactive Surfactant Designed to Mediate Electron Transfer Between CdSe Nanocrystals and Organic Semiconductors

“…This broadening results from inhibited molecular rotation as the nanocrystal and its bound molecules rotate together. [17] An estimation of the number of oligothiophene molecules bound to each nanocrystal could be made by deconvoluting the absorption spectra of the complexes and estimating the absorption coefficients for the surfactant molecules and nanocrystals. Typically, the complexes contained about 50 T5-PA molecules per CdSe nanocrystal.…”

Optically enhanced magnetic resonance for the study of atom-surface interaction

“…This is indeed an essential prerequisit for the validity of the diffusion term in (8). Therefore, the magnetization can be well approximated by a linear function of z on the length scale of the mean free path.…”

“…While conventional NMR on surfaces is restricted to high-surface-area materials such as powders and zeolites [1,7,8], these experiments utilize optical methods for creating and detecting the spin polarization, which results in a tremendous enhancement of the sensitivity and makes possible the observation of spins in a dilute atomic vapor. The Xe nuclei are spinpolarized by spin-exchange collisions with optically pumped Rb vapor.…”