Investigation of SiO2 Coatings Synthesized by Acid and Base Catalysis Sol-Gel Dip Coating Technique

Abstract

Present study deals with the effect of acid and base catalysis on SiO2 coating properties that were synthesized by sol-gel dip coating technique. Microstructural properties of the coatings were characterized by SEM and EDS was used to determine the coating composition. Spectrophotometer has been used to measure the optical properties of the coatings. The results demonstrated that SiO2 coatings deposited by both acid and base catalysis sol-gel dip coating technique were homogeneous and well-adherent. Acid catalyzed SiO2 coatings resulted with dense and smooth surface morphologies whereas base catalyzed SiO2 coatings had nanoporous structure with nanovoids ranging between 15-30 nm. According to the optical analyses, SiO2 coatings have very high transmittance values demonstrating that they are highly transparent especially in the visible light range. 

Keywords

• SiO2 kaplamalar,sol-jel daldırmalı kaplama,mikroyapısal özellikler,nanoporöz yapı,optik özellikler

Asit ve Baz Kataliz Sol-Jel Daldırmalı Kaplama Tekniği ile Üretilen SiO2 Kaplamaların İncelenmesi

Abstract

Mevcut çalışma, asit ve baz kataliz şartlarının, sol-jel daldırmalı kaplama tekniği ile üretilen SiO2 kaplama özelliklerine etkilerinin incelenmesi üzerinedir. Mikroyapısal özellikler SEM ile incelenmiş ve kaplama kompozisyonunu belirlemek için EDS kullanılmıştır. Kaplamaların optik özelliklerini ölçmek için spektrofotometre kullanılmıştır. Elde edilen sonuçlar, hem asit hem de baz kataliz sol-jel daldırmalı kaplama tekniği ile üretilen SiO2 kaplamaların homojen yapıda olduğunu ve iyi yapışma özelliği gösterdiğini ortaya koymuştur. Asit kataliz ile üretilmiş SiO2 kaplamalar yoğun ve pürüzsüz yüzey morfolojilerine sahipken baz kataliz ile üretilen SiO2 kaplamalar, boyutları 15-30 nm arasında değişen nano boşluklar içeren nanoporoz yapıdadır. Optik analiz sonuçlarına göre, SiO2 kaplamalar özellikle görünür ışık aralığında oldukça şeffaf olduklarını gösteren çok yüksek ışık geçirgenlik değerlerine sahiptirler

Keywords

• SiO2 coatings,sol-gel dip coating,microstructural properties,, nanoporous structure,optical properties

References

1. [1]Chen, D. 2001. Anti-reflection (AR) coatings made by sol–gel processes: A review, Solar Energy Materials and Solar Cells, Cilt. 68, s. 313-336. DOI: 10.1016/S0927-0248(00)00365-2
2. [2] Alam, M.J., Cameron, D.C. 2001. Characterization of transparent conductive ITO thin films deposited on titanium dioxide film by a sol–gel process, Surface and Coating Technology, Cilt. 776, s. 142-144. DOI: 10.1016/S0257-8972(01)01183-5
3. [3] Bhatt, V., Chandra, S. 2007. Silicon dioxide films by RF sputtering for microelectronic and MEMS applications, Journal of Micromechanics and Microengineering, Cilt. 17, s. 1066-1077. DOI: 10.1088/0960-1317/17/5/029
4. [4] Gombert, A., Glaubitt, W., Rose, K., Dreibholz, C., Zankea, C., Blasi, B., Heinzel, A., Horbelt, W., Sporn, D., Döll, W., Wittwer, V., Luther, J. 1998. Glazing with very high solar transmittance, Solar Energy, Cilt. 62, s. 177-188. DOI: 10.1016/S0038-092X(98)00008-5
5. [5] Nostell, P., Roos, A., Karlsson, B. 1999. Optical and mechanical properties of sol-gel antireflective films for solar energy applications, Thin Solid Films, Cilt. 351, s.170-175. DOI: 10.1016/S0040-6090(99)00257-6
6. [6] Choudhary, S., Singh, M., Kale, R.K. 2013. Surfactant-catalyzed SiO2 thin films preparation and characterization, Journal of Adhesion Science and Technology, Cilt. 27, s. 2629-2641. DOI: 10.1080/01694243.2013.797857
7. [7] Garcı́a-Cerda, L.A., Pérez-Roblez, J.F., González-Hernández, J., Mendoza-Galván, A., Vorobiev, Y.V., Prokhorov, E.F. 2000. Dielectric properties of SiO2 thin films prepared by the sol-gel technique, Journal of Vacuum Science & Technology B, Cilt. 18, s. 288-292. DOI: 10.1116/1.591185
8. [8] Marsal, A., Ansart, F., Turq, V., Bonino, J.P., Sobrino, J.M., Chen, Y.M., Garcia, J. 2013. Mechanical properties and tribological behavior of a silica or/and alumina coating prepared by sol-gel route on stainless steel, Surface and Coating Technology, Cilt. 237, s. 234–240. DOI: 10.1016/j.surfcoat.2013.06.037

9. [9] Xiao, Y., Shen, J., Xie, Z., Zhou, B., Wu, G. 2007. Microstructure Control of Nanoporous Silica Thin Film Prepared by Sol-gel Process, Journal of Materials Science & Technology, Cilt. 23, s. 504-508. DOI: 10.3321/j.issn:1005-0302.2007.04.014
10. [10] Vishwas, M., Rao, K.N., Phani, A.R., Gowda, K.V.A., Chakradhar, R.P.S. 2011. Spectroscopic and electrical properties of SiO2 films prepared by simple and cost effective sol–gel process, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Cilt. 78, s. 695–699. DOI: 10.1016/j.saa.2010.11.051
11. [11] Buckley, A.M., Greenblatt, M. 1994. The Sol-Gel Preparation of Silica Gels, Journal of Chemical Education, Cilt. 71, s. 599-602. DOI: 10.1021/ed071p599
12. [12] Silva, C.R., Airoldi, C. 1997. Acid and Base Catalysts in the Hybrid Silica Sol–Gel Process, Journal of Colloid and Interface Science, Cilt. 195, s. 381-387. DOI: 10.1006/jcis.1997.5159
13. [13] Rao, A.V., Bhagat, S.D. 2004. Synthesis and physical properties of TEOS-based silica aerogels prepared by two step (acid–base) sol–gel process, Solid State Science, Cilt. 6, s. 945-952. DOI: 10.1016/j.solidstatesciences.2004.04.010
14. [14] Aelion, R., Loebel, A., Eirich, F. 1950. Hydrolysis of Ethyl Silicate, Journal of American Chemical Society, Cilt. 72, s. 5705-5712. DOI: 10.1021/ja01168a090
15. [15] Pope, E.J.A., Mackenzie, J.D. 1986. Sol-gel processing of silica: II. The role of the catalyst, Journal of Non-crystalline Solids, Cilt. 87, s. 185-198. DOI: 10.1016/S0022-3093(86)80078-3
16. [16] Oymak, İ., Karadayı, P., Sarıkaya, N., Tavşanoğlu, T. 2016. Synthesis and Characterization of SiO2 Thin Films by Sol-Gel Dip Coating Technique. 18. Uluslararası Metalurji ve Malzeme Kongresi – IMMC 2016, 29 Eylül-1 Ekim, İstanbul, 863-864.
17. [17] Gündüz, B., Cavaş, M., Yakuphanoğlu, F. 2011. Quality Controlling of SiO2 Thin Films by Sol Gel Method. 6th International Advanced Technologies Symposium – IATS’11, 16-18 Mayıs, Elazığ, 569-573.
18. [18] Shokuhfar, A., Eghdam, E., Alzamani, M. 2012. Effect of Solvent Content on the Properties of Nanostructure Silica Thin Film by Sol-Gel, Nanoscience and Nanotechnology, Cilt: 2, Sayfa: 22-25. DOI: 10.5923/j.nn.20120201.05
19. [19] Zhang, W., Tu, J., Long, W., Lai, W., Sheng, Y., Gou, T. 2017. Preperation of SiO2 anti-reflection coatings by sol-gel method, Energy Procedia, Cilt: 130, Sayfa: 72–76. DOI: 10.1016/j.egypro.2017.09.398
20. [20] Eshaghi, A., Mojab, M. 2014. Fabrication of antireflective antifogging nano-porous silica thin film on glass substrate by layer-by-layer assembly method, Journal of Non-Crystalline Solids, Cilt: 405, s. 148-152. DOI: 10.1016/j.jnoncrysol.2014.09.017
21. [21] Brinker, C.J., Sehgal, R., Hietala, S.L., Deshpande, R., Smith, D.M., Loy, D., Ashley, C.S. 1994. Sol-gel strategies for controlled porosity inorganic materials, Journal of Membrane Science, Cilt. 94, s. 85-102. DOI: 10.1016/0376-7388(93)E0129-8
22. [22] Danks, A.E., Hall, S.R., Schnepp Z. 2016. The evolution of ‘sol–gel’ chemistry as a technique for materials synthesis, Materials Horizons, Cilt. 3, s. 91-112. DOI: 10.1039/c5mh00260e
23. [23] Wu, G., Wang, J., Shen, J., Yang, T., Zhang,Q., Zhou, B., Deng, Z., Fan, B., Zhou, D., Zhang, F. 2000. A novel route to control refractive index of sol-gel derived nano porous silica films used as broadband antireflective coatings, Materials Science and Engineering: B, Cilt, 78, s. 135-139. DOI: 10.1016/S0921-5107(00)00529-8