Synthesis Of One Dimensional Axial Heterostructured Nanomaterials Cu_xIn_xZn₂（1-x）S₂/CdS And The Study Of Their Properties

Heterostructured nanomaterials is a new type of materials which iscomposed of a variety of different components and structures materials. Furtheropportunities of nanoscience are afforded by the effective combination of twoor more chemically distinct components in one single nanostructure withmultifunctional or new properties induced by the heterointerfaces, which willundoubtedly lead to revolutionary new applications of nanomaterials in variousareas,such as catalysis, photovoltaic devices, sensors, and so on. To date, thereare two types of solution routes in the literature for creating nano-objects withheterostructures: seeded growth and catalyst-assisted growth. Catalyst-assistedgrowth, including solution-liquid-solid (SLS) and “supercriticalfluid-liquid-solid”(SFLS) methods,a metal or alloy with a low melting point isused as a catalyst for growing nanocrystals. Our research group found that apart of sulfides can also be used as catalyst for growth of one-dimensionalnanomaterials in the previous study.Herein, we report a facile solution-based method synthesis ofheterostructured nanorods through, using metal sulfide such as Cu1.75S、Ag2S,M(S2CNEt2)y(M(dedc)y, M=Cu, In, Zn), oleylamine, n-dodecanethiol as thecatalyst, precursors, activation agent and coordinating solvent, respectively.And we investigated the optoelectronic property of the heterostructurednanorods in time. The main contents are as follows:1. We report a facile one-pot method for large-scale production ofnanorods CuxInxZn2(1-x)S2, CdS and two step continuous catalytic growthmethod for production of heterostructured nanorods CuxInxZn2(1-x)S2/CdS andCuInS2/CdS based on a solution approach by using metal sulfide (Cu1.75S、Ag2S)as catalyst.2. The morphology,composition and structure of the as-preparedheterostructured nanorods were thoroughly characterized and analyzed byscanning electron microscopy (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDS), high-angle annulardark-field(HAADF) scanning transmission electron microscopy (STEM),UV-1800spectrometer, X-ray powder diffraction (XRD) and X-rayphotoelectron spectrometer (XPS). The growth mechanism is also investigated.3. To further evaluate the optoelectronic properties of the heterostructurednanorods, we fabricated thin films by dropcasting nanorods solutions ontointer-digitated electrode silicon substrate test chips. And it showed an apparentphotoresponse, with increases ranging from3to37times under illumination bya lamp compared with in the dark. The enhancement of photoresponsive currentof the as-prepared nanorods heterostructures is believed to be attributed to theone-dimensional structure and the single crystalline nature of nanorods. It alsoshows that the as-prepared nanorods heterostructures will have good applicationprospects on the solar cells, the photoelectric detectors and many other fields.