Anion-Driven Bandgap Tuning of AgIn(SSe) Quantum Dots.

Accurate tuning of the electronic and photophysical properties of quantum dots is required to maximize the light conversion efficiencies in semiconductor-assisted processes. Herein, we report a facile synthetic procedure for AgIn(SSe) quantum dots with S content () ranging from 1 to 0. This simple approach allowed us to tune the bandgap (2.

From Light to Dark: Dancing with Electrons in Colloidal 2D MoS Nanosheets.

Extending the lifetime of photogenerated electrons in semiconductor systems is an important criterion for the conversion of light into storable energy. We have now succeeded in storing electrons in a photoirradiated colloidal molybdenum disulfide (MoS) suspension, showcasing its unique reversible photoresponsive behavior. The dampened A and B excitonic peaks indicate the accumulation of photogenerated electrons and the minimization of interactions between MoS interlayers.

AgInS-Embedded Photocatalytic Membrane: Insights into the Excited State and Electron Transfer Dynamics.

Photocatalytic reactions at semiconductor nanocrystal surfaces are useful for synthesizing value-added chemicals using sunlight. Semiconductor nanocrystals dispersed in a rigid framework, such as polymer film, can mitigate issues such as aggregation, product separation, and other challenges that are usually encountered in suspensions or slurries. Using a cation exchange technique, we successfully embedded AgInS nanoparticles into a Nafion matrix, termed AgInS-Nafion.

Photoinduced electron transfer across the polymer-capped CsPbBr interface in a polar medium.

In-situ polymer capping of cesium lead bromide (CsPbBr) nanocrystals with polymethyl acrylate is an effective approach to improve the colloidal stability in the polar medium and thus extends their use in photocatalysis. The photoinduced electron transfer properties of polymethyl acrylate (PMA)-capped CsPbBr nanocrystals have been probed using surface-bound viologen molecules with different alkyl chains as electron acceptors. The apparent association constant (K) obtained for the binding of viologen molecules with PMA-capped CsPbBr was 2.

Managing photoinduced electron transfer in AgInS-CdS heterostructures.

Ternary semiconductors such as AgInS, with their interesting photocatalytic properties, can serve as building blocks to design light harvesting assemblies. The intraband transitions created by the metal ions extend the absorption well beyond the bandgap transition. The interfacial electron transfer of AgInS with surface bound ethyl viologen under bandgap and sub-bandgap irradiation as probed by steady state photolysis and transient absorption spectroscopy offers new insights into the participation of conduction band and trapped electrons.

CsPbBr-CdS heterostructure: stabilizing perovskite nanocrystals for photocatalysis.

The instability of cesium lead bromide (CsPbBr) nanocrystals (NCs) in polar solvents has hampered their use in photocatalysis. We have now succeeded in synthesizing CsPbBr-CdS heterostructures with improved stability and photocatalytic performance. While the CdS deposition provides solvent stability, the parent CsPbBr in the heterostructure harvests photons to generate charge carriers.