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Synthesis and Investigation of Antistatic Coating Properties Based on Tin Oxide by Sol-Gel Method

Zakerizadeh, Ali Mohammad | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56639 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem; Abdollah Afshar
  7. Abstract:
  8. In order to prevent electrostatic attraction on non-conductive surfaces, the most practical solution is to put antistatic coatings to reduce surface resistance. Nano tin oxide coatings are designed to produce surfaces with antistatic properties in the resistance range of 108-1012 Ω/cm. In this project, using a simple method, low temperature, without heat treatment and without the use of additive (dopant), tin oxide films with antistatic property were placed on the glass. Further, in order to obtain a coating with a suitable morphology and structure to increase the surface conductivity, the synthesis of tin oxide using the sol-gel method at ambient temperature was used. And to place the coating on the glass substrate, the dipping method was used. The formed film was dried on the surface without heat treatment and at ambient temperature. Different characterization techniques were used to study the properties of SnO2 thin films in this study. To investigate the morphology, grain size, grain direction, film thickness and density of the created coating, from FESEM field emission scanning electron microscope, to detect the percentage of coating elements from EDAX X-ray energy diffraction spectroscopy analysis, to determine the tin oxide coating structure from spectrum analysis XRD X-ray diffraction and FTIR infrared Fourier transform infrared spectroscopic analysis were used for the components and molecular structures. Next, the effect of different parameters of solution synthesis and immersion coating method on the electrical properties of the antistatic coating was investigated. The surface resistance of the coating on the glass base was obtained by the two-pin resistivity method. Also, to determine the anti-dust property of the antistatic film, the dust test was used. In order to determine the degree of adhesion and hardness of the coatings created on the glass, the pencil hardness test was used. The FESEM microscope images showed that the film created on the glass has a compact morphology and structure without defects and cracks with a uniform distribution of particles. The XRD pattern shows that the samples have a microcrystalline structure without any secondary phase. FTIR spectroscopy showed the presence of SnO and SnO2 connections in the solution. The electrical resistance of the glass substrate decreased from 3.36 x 1020 (substrate without glass) to 2.08 x 108 Ohm/cm by placing the tin oxide antistatic film. The results show that the speed of coating and the duration of immersion and aging of the solution as well as the concentration of the solution have a significant effect on reducing the surface resistance. All the films created on the surface are within the antistatic resistance range and have very good adhesion to the substrate. Optimum conditions for coating with the maximum reduction of dust removal and surface resistance for tin chloride with a solution of 0.3 M concentration, immersion speed 2 mm/s and duration of immersion and aging of the solution 60 seconds and 48 hours, respectively. , with surface resistance in the range of 108-109 Ω/cm. The most important effective factors for reducing the surface resistance, tin chloride concentration and immersion speed were determined. In addition, the dust removal performance of the film has been continuously improved, and the best dust removal effect has reached more than 50%
  9. Keywords:
  10. Tin Oxide ; Sol-Gel Method ; Anti-static Coating ; Antidust ; Glass Substrate ; Field Emission Scanning Electron Microscopy (FESEM)

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