Preparation method of orthorhombic tin dioxide thin film
A tin dioxide and orthogonal phase technology, which is applied in the field of preparation of inorganic oxide thin film materials, can solve the problems of property detection and technical application stagnation, and difficulty in synthesis
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Embodiment 1
[0018] The preparation method of this orthorhombic phase tin dioxide thin film, concrete operation steps are as follows:
[0019] a. In order to obtain tin dioxide targets for pulsed laser deposition, we prepared high-purity tin dioxide powder (99.8 %) by sol-gel method. The preparation process and steps are: at 27±2% SnCl 4 Add 28 ± 2% ammonia water drop by drop in the ethanol solution to make the reaction uniform. During the reaction, the pH value is detected in real time. When the pH = 7, the reaction is terminated, and a white sol can be observed. After aging for 24 ± 0.2 hours, Wash several times with ethanol and acetone, and use AgNO 3 Test the filtrate until no Cl is detected - Until now, the obtained gel is placed in a vacuum drying oven at 100°C ± 5°C to dry the water and detergent to obtain a block sample, which is ground into powder to prepare a tin dioxide powder with a particle size of about 4 ± 0.5 nanometers. The powder is made into a round block wit...
Embodiment 2
[0022] This embodiment is exactly the same as Example 1, and the obtained orthorhombic tin dioxide film is tested and studied:
[0023] X-ray diffraction (XRD) studies show that: the main crystal plane index of the prepared orthorhombic tin dioxide film ( figure 2 a-i) Standard X-ray diffraction with orthorhombic tin dioxide (PDF file number: 78-1063, figure 2 a-iii) Basically the same, for example: orthorhombic tin dioxide (111), (112), (113), (002), (006), (115), (200), (117), (222) , (130), (224) and (119) facets, but the (101), (110), (002), (200), (112) and (211) facets of tetragonal tin oxide cannot be excluded (PDF file No.: 85-0712). Therefore, sufficient evidence is needed to further confirm whether the film is orthorhombic tin dioxide. At the same time, the film was placed for half a year, and further X-ray diffraction ( figure 2 a-ii) The research shows that the film is stable and there is no change in the phase.
[0024] X-ray photoelectron ener...
Embodiment 3
[0026] The preparation method of the present embodiment is exactly the same as that of Example 1, and the gained orthorhombic tin dioxide film is studied as follows:
[0027] Mössbauer spectrum research shows that the isotropic shift (IS) and quadrupole split (QS) values are 0 mm / s and 0.6 mm / s, respectively. This experiment fully proves that tin is +4 Valence( image 3 a).
[0028] X-ray electron energy loss (EDS) spectrum research shows that the percentages of tin and oxygen atoms in the film are 33.4 % and 66.6 % respectively, that is, the atomic ratio of tin and oxygen is 1:2. ( image 3 b). It can be deduced that the composition of this film is tin dioxide and the possibility of tin monoxide is excluded.
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