STRONG QUANTUM-SIZE EFFECTS IN A LAYERED SEMICONDUCTOR - MOS2 NANOCLUSTERS

High-quality, size-selected, nano-size (215 nm10%) clusters of MoS2 have been successfully grown inside inverse micellar cages and their optical properties have been studied. These clusters exhibit (1) large blueshifts in the optical-absorption features with decreasing cluster size due to quantum confinement, affording great tailorability in the absorption thresholds and (2) a demonstration of the crossover from bandlike (solid) to moleculelike spectra as the size of the clusters becomes smaller than that of the exciton in the bulk. © 1995 The American Physical Society.