Controllable Synthesis Of Au-PbS-CdS Heterostructures And Its Photocatalytic Application

The metal plasma-semiconductor heterogeneous composite structure formed by substituting metal nanomaterials and semiconductors can improve the separation of the metal-semiconductor interface,and also facilitate the collection of sunlight,enhance the interface energy level calibration,and enhance the electron transport and other functions.This new type of heterogeneous nanostructure has unique and excellent performance in light sensitivity and energy conversion,and has broad application prospects in the fields of solar energy conversion,biosensing and photocatalysis.First,based on gold nanorods,we introduced and studied the controllable synthesis method of heterogeneous nanorod structures in water phase.By adjusting the volume of the precursor and decomposing the growth of the semiconductor PbS,the end-opening shell,the corneropening shell layer and then,using Pb S as the guide layer,realized the secondary selective deposition of Au atoms on the heterogeneous nanorods Peanut-shaped,dumbbell-shaped and sea cucumber-shaped Au-PbS-Au heterostructures were obtained respectively.Through the absorption spectrum test of the obtained sample,the results show that the Pb S shell morphology and Au nanostructure orientation can achieve the adjustment of the optical properties of the Au-PbS heterogeneous nanostructure plasma,and can achieve visible to near infrared spectrum broad spectrum light Preparation of absorbent materials.Through photoelectric conversion,based on the Au-Pb S-CdS heteronano dumbbell structure,we further established a high-efficiency surface plasmon photocatalyst to achieve the effective capture of full-spectrum sunlight,and studied the interface interference characteristics of the structure.The chemical test and the photodegradation experiment of Rhodamine B show that the photocatalytic degradation rate of the Au-PbSCdS nano-surface plasma photocatalyst we designed is 5.2 times that of the PbS-CdS nanoparticles with the same conditions and the same quality.Excellent visible light-near infrared driven photocatalytic activity.This work provides a new way for efficient photocatalysis research.In summary,we used the method of in-situ controlled deposition of gold atoms and CdS on the Pb S guide layer onto the gold nanostructures to prepare the corresponding photocatalysts.We evaluated their photocatalytic activity through photocatalytic degradation of rhodamine B,and further studied their photocatalytic mechanism through absorption spectroscopy and photoelectrochemical characterization.The study found that Au-PbS-CdS nanocrystals exhibited excellent visible light-near infrared driven photocatalytic activity.