Synthesis of Cu _3BiS _3 and AgBiS _2 crystallites with controlled morphology using hypocrellin template and their catalytic role in the polymerization of alkylsilane

摘要

Hypocrellins, photoactive compounds isolated from fungus, were first employed as non-surfactant templates in the synthesis of ternary chalcogenide Cu _3BiS _3 and AgBiS _2 crystallites via a facile ethanol-thermal process. It was also found that the used templates, poly (vinylpyrrolidone) (PVP), poly (ethylene glycol) (PEG), and hypocrellins had strong effect on the morphology of synthesized Cu _3BiS _3 and AgBiS _2 and their catalytic polymerization products of an alkylsilane, C _(18)H _(37)SiH _3 with water. In particular, the orthorhombic phase of wittichenite Cu _3BiS _3 with multi-armed microrods morphology and the cubic Schapbachite and hexagonal phase Matildite AgBiS _2 with flower-like morphology were obtained when hypocrellins were used as templates at 180 °C for _20 h. Although, the used templates seem to have little effect on the crystalline grain size, compared with traditional PVP and PEG templates, hypocrellins have exhibited better directing actions. Furthermore, the polymerization products over Cu _3BiS _3 and AgBiS _2 templated by hypocrellins showed good replica of the morphologies before polymerization while the polymerization products over Cu _3BiS _3 and AgBiS _2 templated by PVP and/or PEG exhibited significant morphology change.