Fabrication Of New Nanostructure Materials By Metai Organic Chemical Vapor Deposition

One-dimensional (1D) nanostructures such as wires, rods, belts, and tubes have become the focus of intensive research areas owing to their unique applications in the fabrication of mesoscopic physics and nanoscale device. It is generally accepted that, among varies methods, template-directed synthesis provides a simple, high-throughput, and cost-effective procedure that also allows the comples topology present on the surface of a template to be duplicated in a single step. Chemical vapor deposition (CVD) represents the method-of-choice for nanomaterials formatin. Distinct advantages of this technique include low cost, and strict control over the resultant porduct stoichiometry and morphology. Therefore, in this research, these two methods were connected to fabricate nanostructure materials.In this work, firstly synthesized an ordered copper nanowire encapsulated in the pore channels of well-defined mesoporous SBA-15 by a low temperature chemical vapor deposition (CVD) method. It is a simple technique for copper deposition due to its low deposition and decomposition temperatures and no requirement of a copper seed layer as mentioned in the electroplating technique. In such a deposition process, organometallic precursor is first deposited in the porous surface of the SBA-15 pore channels. To improve the quality of copper nanowire with the SBA-15 pore channels, hydrogen is introduced simultaneously during the precursor deposition, which acts as a reducing agent to chemically react with the organo-cupric precursor to form smaller organo-cupric fragments. These small fragments can more easily penetrate into the SBA-15 pore channels and then be further decomposed and reduced to elemental copper by the flow of hydrogen gas, leading to the formation of a continuous copper nanostructure in the SBA-15 pore channel. The hydrophobic surface of carbon modified SBA-15 can enhance the adsorption of organometallic precursor because they can have a better interaction. In addition, firstly described the formation of ordered Cu3N nanorods within the channels of SBA-15 powder by a low temperature chemical vapor deposition (CVD) method in ammonia atmosphere.A special Raman spectra peak has been observed which may be a unique feature for Cu3N nanostructure confined in pores of SBA-15. In this MOCVD strategy, the size of Cu and Cu3N nanostructures can be tunable according to the different substrates which give rise to new properties and applications as nanodevices in optical and electronic fields. It is believed that this approach of preparing Cu and Cu3N nanorods is a very promising technique to synthesize other metal or binary nitride one-dimensional (1D) materials and be very useful in the investigation novel physical properties of these new materials.This MOCVD method was also firstly used as a novel, easy and feasible method to modify the pore opening of SBA-15. By finelt choosing the CVD conditions of Cu(acac)2 and Co(acac)2, ink-bottle pore structured SBA-C-Cu and SBA-C-Co composite with pore mouth diameter of about 3.6 nm, pore body diameter of about 5.8 nm, high BET specific area (471.23 m2/g) and large pore volume (0.7659cm3/g) can be successfully synthesized.