Method for producing silver nanowire, silver nanowire, dispersion, and transparent conductive film
A technology of silver nanowires and manufacturing methods, which is applied in the field of manufacturing silver nanowires, and can solve problems such as inability to obtain electrical conductivity and lower thermal stability
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Embodiment 1
[0093] (Preparation of silver nanowire dispersion liquid)
[0094] At room temperature, 2.25 g of silver nitrate (manufactured by Wako Pure Chemical Industries, Ltd.) and 7.2 g of PVP (weight average molecular weight 50,000, manufactured by Wako Pure Chemical Industries, Ltd.) powder were added to 210 g of PG solvent in small amounts while vigorously stirring. , and dissolve it to obtain a dark green mixture.
[0095] Silver nanowires were synthesized using a reaction setup. The reaction device is equipped with: a polytetrafluoroethylene (PTFE) sealed plug-type stirrer (manufactured by Tokyo Rikaki Co., Ltd., MAZELA2310), a nitrogen gas introduction tube, a thermocouple insertion port, and a glass-made 1,000-mL inlet with a mixed droplet inlet. A round-bottom flask and a crescent blade stirring wing made of PTFE. In addition, the above reaction device was incorporated into a multi-mode microwave irradiation device (manufactured by Shikoku Measurement Industry Co., Ltd., μ-Re...
Embodiment 2
[0121] Except that the amount of copper acetate monohydrate was set to 0.074g, 0.222g, and 0.74g, the surface modification of silver nanowires was carried out under the same conditions as in Example 1. In addition, the atomic ratios (ratio of copper atoms to silver atoms) corresponding to the amounts of these copper acetate monohydrates were 0.10, 0.30, and 1.0, respectively.
[0122] Figure 4 It is the absorption spectrum of the purified methanol dispersion about the dispersion C of Examples 1 and 2. Figure 4 In (a), the solid line is the absorption spectrum of the dispersion liquid C after purification in which the ratio of copper atoms to silver atoms is 0.1, and the dotted line is the absorption spectrum of the dispersion liquid A before surface treatment. Figure 4 (b), Figure 4 (c), Figure 4 (d) are absorption spectra of purified dispersion liquids of dispersion liquid C in which the ratio of copper atoms to silver atoms is 0.3, 0.5, and 1.0, respectively. Depend...
Embodiment 3
[0124] Except that nickel acetate 4 hydrate was used instead of copper acetate 1 hydrate, the surface modification of silver nanowires was carried out under the same conditions as in Example 1. However, unlike Example 1, dripping of the ammonia solution was not performed. Because in the case of nickel, it is not necessary to remove the nickel precipitated from the surface of the silver nanowires. In addition, the amount of nickel acetate tetrahydrate used, the atomic ratio in the mixed solution, and the absorption maximum wavelength are shown in the table below. The target silver nanowire dispersion can be obtained by washing the obtained dispersion by centrifugation.
[0125] [table 3]
[0126] Nickel acetate 4 hydrate (g) Atomic ratio ([Ni 2+ ] / [Ag])
Absorption Maximum Wavelength (nm) No.1 0.460 0.50 362 No.2 0.277 0.30 362 No.3 0.092 0.10 364 No.4 0.046 0.05 366 No.5 0.018 0.02 370
[0127] (TEM image)
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