30results about How to "Raise the enhancement factor" patented technology

The invention discloses a membrane field emitting cathode of a carbon nanotube with double-layer blending structure and a preparation method thereof. Ti nano-powder is adopted to be mixed for preparing composite sizing agent (CNT), and CNT cathode membrane with single-layer Ti blending structure is printed by screen printing technique. The CNT composite membrane cathode with the double-layer blending structure that is TiO2 blending structure at the upper layer and Ti blending structure at the lower layer is formed by two-step sintering technique. On the surface layer of the composite membranecathode, conductive Ti is transformed into non-conductive dielectric material TiO2; shielding effect caused by the mutual contact of CNT is reduced, thereby being beneficial to the increase of enhancement factor of a CNT emitter. At the bottom of the composite membrane cathode, the blending nanophase material Ti enlarges the contact area between the CNTs and between the CNT and an underlay, reduces the contact resistance between the conductive electrode layers and the CNT layers and improves the electronic transportation performance of the self of CNT at the lower layer of the composite membrane cathode.

The invention discloses a preparation method of a large-area surface enhancement raman scattering substrate. The preparation method comprises the following steps: at first, the surface of a hard solid material is irradiated by femtosecond laser to prepare a large-scale hard microstructural mother set; then, polydimethylsiloxane (PDMS) is poured on the hard microstructural mother set by the nanoimprint lithography technology, and the structure on the hard microstructural mother set is copied to prepare a PDMS framework; and finally, a gold film is plated on the PDMS framework to prepare the PDMS surface enhancement raman scattering substrate. The experiment results show that the preparation method has the advantages that the enhancement factors are high, enhancement factors in different positions of the substrate have good uniformity, the large-area surface enhancement raman scattering substrate can be prepared, the mother set can be repeatedly imprinted, the production cost is reduced, and in addition, god is taken as raman enhancement metal, so that the defect that silver is oxidized very easily is avoided.

The invention provides a two-dimensional periodic V-shaped metal plasma resonance structure which comprises a substrate (1) and a metal film (2). The substrate (1) is in the shape of a V-shaped groove, and a slit is formed at the bottom of the V-shaped groove; the metal film (2) is arranged on the upper surface of the substrate (1) and is positioned in the V-shaped groove. The invention further provides a method for manufacturing the structure. The two-dimensional periodic V-shaped metal plasma resonance structure and the method have the advantages that the structure is extremely high in electromagnetic enhancement factor, target molecules can assuredly pass a resonance enhancement region of a local field when passing a detecting unit, and the high detecting sensitivity and high detecting precision are guaranteed.