A simple and green method was developed for in situ assembly of gold nanoparticles on nitrogen-doped carbon nanotubes, and the resulting Au/nitrogen-doped carbon nanotubes nanocomposite was used as an immobilization scaffold of antibody for sensitive immunosensing of microcystin-LR.

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Highly ordered TiO2 nanotube arrays (TNTAs) with smooth walls and uniform diameter were prepared by electrochemical anodization. And then solution deposition process was adopted for the modification of the TNTAs with nanoscaled CdSe. The materials obtained were characterized by field emission scanning electron microscopy, UVvisible spectroscopic and photoelectrochemical techniques. The results revealed that the morphologies and growth mechanism for CdSe/TNTAs composites varied with the reaction time in Se2- solutions (c=1.2 mol/L) when nanotubes were firstly imported with Cd2+ ions. Optical absorption behavior of the CdSe/TNTAs composites increased with more CdSe nanoparticles. And the photo-response of the obtained nanomaterials was first strengthened and then declined with the sustained increase of the deposited CdSe.

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To overcome the overcoming of agglomeration and reclamation of nanoparticulate materials, it is imperative to synthesize nanosized materials with other morphologies. Fe3O4nanotubes were synthesized by using anodized aluminum oxide as template under microwave assistance by tuning the deposition mechanism in this work. The obtained nanotubes were characterized by the means of XRD and SEM. Its magnetic property was also investigated. Results show that tubes are of the spinel structure, a layer of about 30 nm Fe3O4was deposited attaching to the AAO wall, and the nanotubes possess good magnetic performance.