Complex alloy thin film with hydrogen-inducing off-coloring function and production thereof

A multi-element alloy and alloy thin film technology, applied in the field of functional materials, can solve problems such as poor hydrogen absorption and desorption kinetics, poor optical properties, and poor film stability

Inactive Publication Date: 2006-08-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, despite the good hydrogenation performance of the pure rare earth system, the high optical contrast of the RE-Mg system, the low cost of the Mg-Ni syst

Method used

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  • Complex alloy thin film with hydrogen-inducing off-coloring function and production thereof
  • Complex alloy thin film with hydrogen-inducing off-coloring function and production thereof
  • Complex alloy thin film with hydrogen-inducing off-coloring function and production thereof

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Experimental program
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Effect test

Embodiment 1

[0035] 1) Preparation of bulk alloy

[0036] At room temperature and under a protective atmosphere of nitrogen or argon, weigh 1:1, 1:3 and 3:1 molar amounts of La and Ni, and then use induction heating under high vacuum for melting to make LaNi, La 3 Ni and LaNi 3 bulk alloy. In order to ensure the uniformity of the composition, the solidified alloy is turned over, smelted repeatedly, and finally the obtained bulk alloy is prepared such as figure 1 shown.

[0037] 2) Thin film deposition

[0038] The smelted LaNi alloy and pure Mg were put under ultra-high vacuum conditions (10 -9 Pa), by electron beam evaporation, the multilayer film with ABABAB structure is deposited by evaporation. Among them, each layer of LaNi is 1.5nm, a total of 25 layers; each layer of Mg is 1.5nm, a total of 25 layers.

[0039] 3) Thin film protective layer

[0040] A nickel protective layer was deposited on the surface of the film by sputtering, with a thickness of 2 nm. The prepared films a...

Embodiment 2

[0044] Taking the prepared LaMgNi alloy thin film as an example, the alloy thin film is hydrogenated as Figure 4 shown. Figure 4 In the middle, the badge of Fudan University under the film is clearly visible. The film is colorless and transparent, with high transmittance and low reflectance and absorptivity. Figure 5 The change of transmittance before and after hydrogenation was compared. It can be seen from the figure that the transmittance of the film before hydrogenation is almost zero, and the maximum transmittance reaches 50% after hydrogenation, and the average transmittance is 45% in the wavelength range from 400nm to 900nm. The alloy thin film of the invention has high transmittance in the range of visible light and can meet the requirements of practical application.

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Abstract

The invention is about the La-Mg-Ni alloy and the multiple alloy film which can change the color by the H2. The alloy firm has the low hydriding condition, the quick hidriding speed and the big photo-electricity character, good stability and long life. The alloy material forms the alloy film through the codeposition or deposition separately by the sputter method, then to form the nanometer alloy film after the annealing. The alloy film can be used for the H2 detector, temperature bulb, the building materials, the car back mirror, optical logic door, the satellite and the communication apparatus.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to an alloy film material and a preparation method thereof. The prepared alloy film has the function of "hydrogen-induced discoloration" and can be used to make optical logic gates, photoelectric switches, hydrogen detectors and temperature sensors. Background technique [0002] The interaction between hydrogen and transition metal elements is an important research field in materials science and physics. In 1996, Professor R.Griessen from the Department of Physics of Vrije University in the Netherlands discovered that the metal Y thin film can absorb hydrogen atoms quickly at room temperature and 1atm hydrogen pressure, and first generate the hydride YH 2 , and then transformed into YH 3 . Accompanied by this phase transition process, the optical properties of the Y film changed from opaque before hydrogen absorption to light transmission after hydrogen a...

Claims

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Application Information

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IPC IPC(8): C23C14/14C23C14/34
Inventor 孙大林方方张晶陈国荣
Owner FUDAN UNIV
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