Additional file 1: Figures S1–S6. of Facile Fabrication of Bi2WO6/Ag2S Heterostructure with Enhanced Visible-Light-Driven Photocatalytic Performances

The EDS, BET surface area, and Zeta potential analysis for the as-formed heterostructures, the XRD pattern of Ag2S, and the temporal evolution of Rh B absorption spectra over Bi2WO6/Ag2S heterostructure at different pH values. Figure S1. Elemental mapping and EDX spectra of the Bi2WO6/Ag2S heterostructure. Figure S2. EDS spectra of the composite photocatalysts Bi2WO6/Ag2S. Figure S3. Nitrogen adsorption-desorption isotherms and the pore size distribution curve (inset) of sample (a) Bi2WO6 and (b) Bi2WO6/Ag2S. Figure S4. XRD pattern of Ag2S. Figure S5. Zeta potential for a suspension containing 1 g L of sample Bi2WO6/Ag2S in the presence of KCl (10−3 M) at different pH values. Figure S6. The temporal evolution of Rh B absorption spectra over Bi2WO6/Ag2S heterostructure at different pH values

Precursor-mediated linear- and branched- polytypism control in CuαZnβSnySeδ colloidal nanocrystals using a dual-injection method

Control of polytypism in colloidal nanocrystals allows for a shape evolution from 0D to 3D and also provides an opportunity to tailor physical properties that are crystal phase dependent. Initiating polytypism in nanostructures is a function of multiple different control parameters that dictate nucleation and growth, including reaction temperature, ligands, and precursors. This is further complicated as the number of metal ions increases in progressing from binary to ternary to quaternary compositions. Here, a synthesis method with dual injections is developed to initiate two- and three-dimensional polytypism in the nonstoichiometricαβδ CuαZnβSnγSeδ system simply by changing a single commercially available chemical precursor. Synthesis parameters were developed to grow single-crystal wurtzite and zinc-blende forms with a further extension to linear and branched morphologies deriving from nucleation in one phase and growth termination in the other. Photoluminescence measurements were carried out on the particles at a low temperature with emission peaks ranging from ∼1.93 to ∼2.32 eV observed

Synthesis and characterization of CuZnSe2 nanocrystals in wurtzite, zinc blende and core-shell polytypes

CuZnSe2 (CZSe) is an important ternary semiconductor comprised of earth-abundant elements with a suitable bandgap for visible light absorption and structural/stoichiometric versatility that make it a promising candidate for photovoltaic applications. Here we report the controlled synthesis of the compound copper chalcogenide in nanocrystal form using a colloidal hot injection approach. Furthermore, we demonstrate control over the crystal phase to occur as either wurtzite (WZ) or zinc blende (ZB) as a function of the presence and absence of phosphine-based ligands. A major emission peak was observed at ∼1.7 eV using low-temperature photoluminescence (PL), ranging from 30 to 200 K. Additionally, we demonstrate the ability to extend this synthetic protocol to form a polytype structure comprised of a ZB core with a WZ shell