研究目的
Investigating the controlled growth of Cu2?xS sheet-like nanoshells and Cu2?xS–CdS p–n junctions on Au nanorods to enhance photocatalytic activities through plasmon resonances.
研究成果
The Au/(Cu2?xS–CdS) heterorods with non-centrosymmetrical vertical cross-sections exhibit enhanced photocatalytic activity due to effective charge separation at the interfaces of CdS–Au, Cu2?xS–Au, and Cu2?xS–CdS junctions. The synthetic strategy provides a new route for designing plasmon-exciton heterostructures with improved photocatalytic performance.
研究不足
The study focuses on the photocatalytic degradation of rhodamine B, and the applicability to other pollutants or under different conditions is not explored. The synthesis process requires precise control over reactant concentrations and growth conditions.
1：Experimental Design and Method Selection
The study involves a synthetic strategy for growing Cu2?xS sheet-like nanoshells on Au nanorods using Ag2S auxiliary templates, followed by the formation of Cu2?xS–CdS p–n junctions through cation exchange reactions.
2：Sample Selection and Data Sources
Au nanorods were prepared via a seed-mediated growth method. The growth of Cu2?xS and CdS shells was controlled by varying the concentrations of CuCl2 and Cd(NO3)2, respectively.
3：List of Experimental Equipment and Materials
Materials included hexadecyltrimethylammonium bromide (CTAB), chloroauric acid (HAuCl4·4H2O), silver nitrate (AgNO3), copper chloride dihydrate (CuCl2·2H2O), and cadmium nitrate tetrahydrate (Cd(NO3)2·4H2O). Equipment included TEM (JEOL-2100F), XRD (D8-Advance), XPS (ESCALAB 250Xi), and UV-Vis-NIR spectrophotometer (TU-1810).
4：Experimental Procedures and Operational Workflow
The process included the synthesis of Au NRs, growth of Ag2S auxiliary semi-shells, selective growth of Cu2?xS nanoshells, and formation of Cu2?xS–CdS p–n junctions via cation exchange. Photocatalytic activities were evaluated by photodegradation of rhodamine B under visible light.
5：Data Analysis Methods
Photocatalytic efficiency was analyzed by measuring the degradation rate of rhodamine B. Photocurrent responses were evaluated using an electrochemical workstation. Morphology and crystal structure were characterized by TEM and HR-TEM.
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