Synthesis And Application Of MnO@C Nanocomposites

Transition metal oxides, including FeOx, CoOx, MnOx etc, which are endowed with rich oxidation state and chemistry. The electron transfer of Transition metal oxides structures, along with the fast development of versatile structures controlled controlled during the growth, has offered substantial potentials in many application fields, including catalysis, chemical/biological sensing, and energy storage. Nonetheless, these performances are still limited due to, in general, the low electrical conductivity, low rate capability, and suboptimal structural stability of transition metal oxide. A variety of approaches, such as nanostructure fabrication, chemical modification, and incorporation with high surface-area, conductive materials have been explored to improve the performance of transition metal-based electrodes.In the second chapter, we demonstrate a facile method for direct coating of MnO organic precursor solution onto substrates without conducting polymer binders, followed by thermal treatment to grow monodispersed,-10 nm-diameter MnO NPs embedded in a mesoporous carbon matrix. As proofs-of-concept, LIB anodes made of this monodispersed MnO@C nanocomposite display excellent reversible capacities of over 800 at current densities of 0.1 A g-1, respectively. Supercapacitors made of this MnO@C nanocomposite exhibit stable capacitances of 140, at current densities of 1 A g-1, respectively, which also show excellent mechanical stability over repeated folding and stretching. Finally, this MnO@C nanocomposite demonstrates sensitive electrical response to H2O2 in buffer solutions, and has been applied to interrogate the H2O2 concentration in cellular assays for tumor cell analysis.In the third chapter, we mainly use photolithography method make the carbon nanotube array, and fabricate the same kind of mask and resist made complementary two kinds of carbon nanotube arrays by changing the order of the whole technological process. This array the finest point to 4 μm, each pattern was under 0.5mm2. This method can be applied to the nanowires array or other aspects, such as microfluidic, cell cultivation and biological detection, has a lot of potential applied values.