Study On Stability And Reactivity Of ZnSe（DETA）_0.5 Nanosheets

Poor stability and high reactivity were always walking together as a double-edged sword for nanomaterials, which is love-hate relationship. It is meaningful to observe the stability and reactivity of nanomaterials in a specific stimulating condition, for understanding structures and designing new nanomaterials. In recent years, a family of metal chalcogenide-amine inorganic-organic hybrid nanomaterials have been attracting significant attention. On the one hand, their unique structures endow with their specific properties; on the other hand, they are ideal precursors of physical exfoliation and chemical transformation. It is convenient to stimulate and monitor dynamical behavior variation at room temperature because inorganic-organic hybrid nanomaterials contain organics internally. So inorganic-organic hybrid nanomaterials contain organics are suitable to be the objects of observation for stability and reactivity.This dissertation will focus on the stability and reactivity of ZnSe(DETA)0.5 hybrid nanosheets. We design experiments to attack the organics of ZnSe(DETA)0.5 nanosheets by adjusting pH value in aqueous solution. Then, we monitor dynamical behavior variation of reaction system and materials structure. A series of continuous information with time will be obtained. The information contributes to our understanding stability & reactivity, structure and designing of nanomaterials. The present work demonstrates that an appropriate balance between poor stability and high reactivity of a specific layered nanostructure allows it possible to capture the highly reactive intermediates, which will provide a new platform. The main results can be summarized as follows:1. We revealed chemical mechanism during the acidification process of ZnSe(DETA)0.5 nanosheets by combining dynamical monitoring and analysis of apparent kinetics and thermodynamics. It contributed to deep understanding lamellar hybrid structure and cognizing the relationship between poor stability and high reactivity of hybrid nanomaterials. And we built a new platform for synthesis of various mesoporous metal selenides including Ag2Se nanosheets, CuSe nanosheets, PtxSey alloy nanosheets, and PdxSey alloy nanosheets.2. We came up with a kind of method on releasing Se source by acidification of some hybrids including ZnSe(DETA)0.5 nanosheets. It was designed to make Se react with metal nanomaterials such as Ag nanowires to synthesize some modified nanomaterials such as Ag@Ag2Se core-shell nanotubes. It will help us avoided the difficulty of controlling the release of Se source from CSe2 etal. It will make our chemical experiment and chemical industry production more convenient and safe in the future.3. We developed a way to control Au nanoparticles grow on the edge of ZnSe(DETA)0.5 nanosheets. This way takes advantage of the lamellar hybrid orientation and defect growth priority principle. The prepared unique Au/ZnSe(DETA)0.5 nanosheets can be transformed to Au/ZnSe nanosheets at high temperature. The Au/ZnSe nanosheets can keep primal morphology from Au/ZnSe(DETA)0.5 nanosheets. This specific metal/semiconductor material may be promising for photovoltaic conversion.