| Graphene is gaining importance in materials science and biotechnology due to its outstanding properties, including prominent electrical conductivity, extraordinary mechanical strength, and good biocompatibility. Graphene oxide (GO) is an oxidized derivative of graphene containing multi-functional groups such as carboxyl, epoxy, ketone, and hydroxyl groups and sp2-conjugated bonds on its surface, which offers strong hydrophilic characteristics and the feasibility of excellent π-π interactions with various aromatic molecules. Recent studies have demonstrated that GO has great potential for use in biosensors because of its unique characteristics such as facile surface modification, good water dispersibility. The various combination of nanoparticles and graphene oxide (GO) can be not only used as a new type of nanohybrids, directly used in biomedical detection and organic catalysis, but also used as a kind of magnetic carrier, loading other functional materials, endowing them magnetic recyclability and stability.The main work of this dissertation as follows:(1) A new Zn(Ⅱ) complex was synthesized based on a new Salen-type tetradentate N2O2 bisoxime chelate ligand (H2L) derived from 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) and 1,2-bis-(aminooxy)ethane. Single-crystal X-ray diffraction analysis reveals that the structure of the Zn(Ⅱ) complex features a three-dimensional (3D) cyclic supramolecular system via intermolecular hydrogen bonds. Moreover, the solid-state photoluminescent properties demonstrate that the Zn(Ⅱ) complex exhibits unusual luminescence mechanochromism tuned by CH3OH.(2) In this chapter, we reported a facile synthesis of Au NPs with high yield and good size monodtspersity supported on graphene oxide (GO) nanosheets via coordination bonds.As characterized by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), thermogravimetric analysis (TGA) techniques, well-defined Au NPs with an average size of 5 nm were uniformly distributed on the GO surfaces. The as-prepared Au/GO nanohybrids with excellent colloidal stability in aqueous solution exhibit superior catalytic activity toward the degradation of methylene blue (MB) compared to unsupported Au NPs. Thus, the resultant Au/GO nanohybrids as promising heterogeneous catalyst might have widely potential applications in water-based catalysis systems for the future.(3) In this chapter, we reported a facile synthesis of Fe3O4 NPs with high yield and good size monodispersity supported on graphene oxide (GO) nanosheets via coordination bonds. As characterized by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) techniques, well-defined Fe3O4 NPs with an average size of 5 nm were uniformly distributed on the GO surfaces. The as-prepared Fe3O4/GO nanohybrids with excellent dispersibility in aqueous solution exhibit regular T2 magnetic resonance imaging.(4) In this chapter, we develop an efficient strategy in developing strongly coupled Au/Fe3O4/GO hybrid material to improve the catalytic activity, stability, and separation capability of Au nanoparticles (NPs) and Hg2+. The hybrid material is synthesized by direct anchoring of Au and Fe3O4 NPs on the functional groups of GO. This approach affords strong chemical attachment between the NPs and GO, leading this hybrid material ultrasensitive detection of Hg2+ in aqueous with a detection limit as low as 0.15 nM. In addition, the deposition of Hg0 on the surface of the Au/Fe3O4/GO could be quickly (within 30 min) and efficiently (>99% elimination efficiency) removed by the simple application of an external magnetic field and subsequently reused at least 15 times, while the elimination efficiency is still high (>96%). |
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