Effects of different modification processes on the optical and hydrophilic properties of zinc oxide films

A sol-gel method was used to prepare nano-ZnO films on glass substrates. Sodium laurate and silane coupling agents were used to modify the ZnO films to study the effects of different modification processes on the optical and hydrophilic properties of ZnO films. The microstructure, optical properties, hydrophilicity and hydrophobicity of the modified nano-zinc oxide film were studied by contact angle measurement, scanning electron microscope, ultraviolet-visible photometer, fluorescence spectrometer and other methods. The results show that the use of different modifiers or different modifier systems can make the concentration of donor defects on the surface of the zinc oxide film different, resulting in that the optical properties and surface hydrophilicity and hydrophobicity of the zinc oxide film vary with the modification process. Present a certain pattern of change.

Nano ZnO particles are small in size, large in specific surface area, and have obvious surface and interface effects, quantum size effects, volume effects, etc., which make them exhibit unique physical and chemical properties in chemistry, optics, biology and many other aspects, and are widely used Used in conductive materials, piezoelectric materials, rubber industry and many other aspects. However, nano-ZnO is easy to agglomerate, difficult to disperse, and has the characteristics of hydrophilic and oleophobic, so that when zinc oxide is used as an inorganic additive, the application efficiency is low. In recent years, there have been reports on the surface modification of zinc oxide with surface modifiers to change its surface properties. Wang Guohong and others tried to modify zinc oxide using modifiers such as sodium laurate and stearic acid, and Yu Lijuan and others used silane coupling agents to modify zinc oxide. Such studies have improved the performance of zinc oxide to a certain extent. Hydrophobic properties. This article uses sodium laurate, silane coupling agent and their combined system to modify the zinc oxide film. The effect of the modifier on the optical properties, hydrophilic and hydrophobic properties of the ZnO film material is tested, and the effect of the modifier on the nanometer The influence mechanism of ZnO film properties.

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Reagents: Zn(COOH)2, ethylene glycol methyl ether, absolute ethanol, ethanolamine, silane coupling agent (KH560), sodium laurate, all of which are of analytical grade.

Instruments: Magnetic heating stirrer, ultrasonic cleaner, scanning electron microscope (SEM, S-4800, Hitachi), ultraviolet-visible spectrometer (UV-2500, Shimadzu), homogenizer, contact angle tester, fluorescence spectrometer (F- 4500, Hitachi).

Select Zn(COOH)2, ethylene glycol methyl ether and ethanolamine as precursors, solvents and stabilizers, and configure the sol as follows. A certain amount of Zn(COOH)2 was dissolved in ethylene glycol methyl ether, and then a certain amount of ethanolamine was added, and heated in a water bath for a certain period of time with constant stirring to obtain a transparent and uniform light yellow colloid, which was aged for 24 h. In the experiment, a quartz glass plate was used as the substrate, and the uniform coating was carried out at a speed of 3000 r/min; the obtained sol layer was heat-treated at 150°C for 10 min, and then annealed at 600°C for 2 h to obtain a zinc oxide film sample.

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The aqueous solutions of KH560 and sodium laurate with a concentration of 0.1 mol/L were prepared as the modification solution. Take 10 ml of one of the two modification solutions mentioned above and put it in a beaker, add magnets, put in the zinc oxide film sample, heat it on a magnetic stirrer at a constant temperature of 50 ℃ for 10 minutes, take out the film and use it Ionized water is used for washing and drying to obtain a modified sample. If this first modified sample is put into another modification solution and modified with the same process for 10 min, a second modified sample will be obtained. The marking methods of 5 samples obtained with different modifiers and different modification times are listed in Table 1.

1.4 Characterization of ZnO film and measurement of contact angle

The contact angle of the sample surface was measured with a contact angle tester, and the morphology and structure of the film were characterized by SEM. The light transmittance and optical band gap of the film were measured with an ultraviolet-visible spectrometer, and the photoluminescence (PL) spectrum of the film was measured with a fluorescence spectrometer.

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Effects of different modification processes on the optical and hydrophilic properties of zinc oxide films

The sol-gel method is used to prepare the zinc oxide film. Use sodium laurate, KH560 to modify the zinc oxide film. The SEM results show that the surface morphology of the sample modified with sodium laurate and the sample modified with KH560 first and then sodium laurate are similar, which is different from the surface morphology of the samples modified by other modification methods. Samples with different modification methods have a higher transmittance in the visible light region, but a lower transmittance in the ultraviolet region, and the different order of addition of modifiers has different effects on the forbidden band width. They are modified by KH560 first. The band gap of the sample modified by sodium laurate is the smallest.

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The results of PL spectrum and band gap of the sample show that sodium laurate and KH560 can increase the concentration of donor defects (Zni defects) on the surface of zinc oxide. When the modifier modifies the sample, the substance formed by the modifier molecule and the sample has a complex structure. Due to the steric effect, the zinc atoms of the zinc oxide lattice may deviate from their original positions to form interstitial zinc atoms. The effect of using two modifiers to modify is different from that of a single modifier, and the different modification sequence has different effects on the increase of defect concentration, which leads to the contact angle and PL of the sample obtained under different modification processes. There is a certain difference between the spectrum and the UV-visible transmittance spectrum.

Founded in 2015,Zunhua Baorui Titanium Equipment Co.,Ltd. is a manufacturer specializing in pvd vacuum ion coating equipment. The company’s products mainly include large plate coating machine, large tube collating machine, tool coating machine and LOW-E glass production line. Mr.Wang baijiang ,general manager of the company ,has been engaged in vacuum coating industry for more than 30 years. He continuously improve production technology, improve product performance and devote himself to provide customers with better product experience and higher production efficiency.