The Preparation Of Metal Nano-array Materials And THz Spectroscopy Study Of Benzoic Acid Derivatives

In recent years, nano-science and technology have developed rapidly. It has become the focus of academics research to prepare highly ordered nano-materials with chemical and physical methods. We prepared anodic aluminum oxide (AAO) template by twice anodic oxidation, and at the same time, the gold membrane and silver membrane with very regular rules of the nano-holes array were obtained using the magnetron sputtering. SEM and AFM results show that the metal films with inerratic nano-holes are distributed evenly, and the AAO template holes are the same. Metal membrane pore size and thickness can be controlled by different aperture of, the AAO template, sputtering time, sputtering current as well as sputtering pressure. This technology of copying metal nano-holes array membrane is simple, rapid, and easy to control. Furthermore, it provides a new technology for the replication of metal nano-film.The silver quantum dots whose diameter is about 80nm were prepared successfully on the AAO template with the method of vacuum evaporation. Quantum dots whose diameter is the same as AAO template have uniform size, consistent and highly ordered nano-holes. The silver quantum dots as the substrate of surface-enhanced Raman scattering spectroscopy were studied using p-nitroaniline as a probe.Benzoic acid and its derivatives are an important chemical raw materials and, and they are widely used in organic synthesis and dye industry and the pharmaceutical industry. In recent decades, to a large number of these products have been used as the rapid development of petroleum, chemicals, pharmaceuticals and dyeing industry ,however, it also brings serious problem of pollution. THz absorption spectra of the band and refractive index spectrum between 0.2 ~ 2.5 of p-hydroxybenzoic acid, p-hydroxybenzoic acid between, p-aminobenzoic acid were studied under the nitrogen condition at room temperature with the of method of THz time-domain spectroscopy testing. The results show that these four elements in the THz band have distinctly different absorption properties. We also give four elements THz logo spectrum, which provide a scientific basis for the effective detection and identification of these four elements and also provide data for further study and related molecular conformation. In addition, we introduced Sudan 2 who can be mixed and planished with p-hydroxybenzoic acid and detect THz in the terahertz time-domain spectroscopy technology to take the place of polyethylene powder, and have also obtained, the ideal THz absorption spectra. in experiments It has been proved that Sudan 2 did not have THz-band absorption peak and can play a diluted and supporting role of the sample. What's more, the price is about half of polyethylene, and they can be easily accessed in the domestic market. There is a practical application value in THz time- domain spectroscopy detection technology.