Preparation And Performance Of Low Dimensional Nanocomposite With Hollow Structures

In recent years, hollow nanostructures attracted special interest, due to their potential applications such as in gas sensor, drug delivery, lithium ion battery, photonic devices and robust catalysts/carriers. However, with the rapid development of modern technology, investigation on one material can not meet the actual needs. Therefore, the multicomponent nanomaterials with more complexed structure and powerful functionality attract much attention. There are two strategies to get better performance in some property than other materials. One strategy is fabricating multifunctional nanocomposites, which can combine together the different properties perfectly. Another strategy is that using the coordinated effect of different materials to enhance performance in a property.In this study, the strategies mentioned above guided us to design lower-dimensional nanocomposite with hollow structures. All the research contents and results are shown as follows:(1) In the first chapter, we present a strategy for fabrication of hollow poly (N-isopropylacrylamide) PNIPAM/Fe3O4-ZnS hybrid hollow spheres. In this approach, the thermosensitive PNIPAM hollow spheres were first synthesized via a one-pot "self-removing" progress and then employed as templates. After the templates were covered compactly by the inorganic nanopaticles, an organic-inorganic hybrid shell will form directly. The morphologies and properties of these hybrid hollow spheres were characterized by TEM, SEM, TGA, XRD, BET, PL and VSM. The obtained PNIPAM/Fe3O4-ZnS hybrid hollow spheres show both magnetic and luminescent properties. In addition, the drug loading and in vitro release behavior show thermosensitive properties.(2) In the second chapter, we developed a simple and effective method to synthesize α-Fe2O3@MnO2core-shell nanotubes. In this approach, α-Fe2O3nanotubes were first synthesized by simple anion-assisted hydrothermal method. CTAB surfactant was used to modificate the surface of as-prepared nanotubes. Then the modified α-Fe2O3nanotubes employed as templates to fabricate α-Fe2O3@MnO2core-shell nanotubes. The influences of the reaction conditions on the morphology have been studied. The morphologies and structure of these α-Fe2O3@MnO2core-shell nanotubes were characterized by TEM, SEM, XRD、XPS and EDS. The photoelectrochemical properties were investigated by three-electrode test system.