Superhydrophilicity of photocatalytic ZnO/SnO2 heterostructure for self-cleaning applications
Source abstract
Abstract
Sol–gel spin coating technique was used to deposit thin films of ZnO, SnO2, and ZnO/SnO2 on a borosilicate glass substrate. The films were characterized using XRD, FESEM, EDX, HRTEM, AFM, UV-Vis spectrophotometer, and contact angle meter. X-ray diffraction confirms the presence of both hexagonal wurtzite and tetragonal phase of ZnO and SnO2 respectively in ZnO/SnO2. Wettability studies reveal that ZnO/SnO2 film is superhydrophilic with water contact angle of 3.4°. The photocatalytic performance of the films is evaluated by measuring the degradation of an aqueous solution of methylene blue, methyl orange, and their mixture. The degradation of stearic acid adsorbed on the film’s surface is measured by tracking the water contact angle after UV irradiation as a function of time. The excellent photocatalytic activity of ZnO/SnO2 thin films is attributed to formation of type-II heterostructure between ZnO and SnO2, which inhibits the charge recombination between photogenerated electrons and holes. The ZnO/SnO2 shows good photocatalytic activity after five recycling runs. ZnO/SnO2 thin films being excellent photocatalyst along with its superhydrophilic nature will have potential application in self-cleaning and antifogging.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · ZnO doping and properties · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
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1. Fujishima A, Zhang X (2006) Titanium dioxide photocatalysis: present situation and future approaches. Comptes Rendus Chimie 9:750–760.10.1016/j.crci.2005.02.055 ↗
2. Krishna MG, Madhurima V, Purkayastha DD (2013) Metal oxide thin films and nanostructures for self-cleaning applications: current status and future prospects. Eur Phys J Appl Phys 62:3000110.1051/epjap/2013130048 ↗
3. Drelich J, Chibowski E, Meng DD, Terpilowski K (2011) Hydrophilic and superhydrophilic surfaces and materials. Soft Matter 7:9804–982810.1039/c1sm05849e ↗
4. Feng L, Li S, Li Y, Li H, Zhang L, Zhai J, Song Y, Liu B, Jiang L, Zou D (2002) Super-hydrophobic surfaces:From natural to artificial. Adv Matter 14:1857–186010.1002/adma.200290020 ↗
5. Feng X, Feng L, Jin M, Zhai J, Jiang L, Zhu D (2004) Reversible super-hydrophobicity to super-hydrophilicity transition of aligned ZnO nanorod films, photoinduced superhydrophilicity and photocatalytic properties of ZnO nanoplatelets. J Am Chem Soc 126:62–6310.1021/ja038636o ↗
6. Okada K, Tokudome Y, Falcaro P, Takamatsu Y, Nakahira A, Takahashi M (2012) Titanate nanofunnel brushes: toward functional interfacial applications. Chem Commun 48:6130–613210.1039/c2cc32081a ↗
7. Barreca D, Gasparotto A, Maccato C, Tondello E, Stangar UL, Patil SR (2009) Photoinduced superhydrophilicity and photocatalytic properties of ZnO nanoplatelets. Surf Coat Tech 203:2041–204510.1016/j.surfcoat.2009.02.002 ↗
8. Papadopoulou EL, Barberoglou M, Zorba V, Manousaki A, Pagkozidis A, Stratakis E, Fotakis C (2009) Reversible photoinduced wettability transition of hierarchical ZnO structures. J Phys Chem C 113:2891–289510.1021/jp8085057 ↗
9. Langlet M, Permpoon S, Riassetto D, Berthome G, Pernot E, Joud JC (2006) Photocatalytic activity and photo-induced superhydrophilicity of sol–gel derived TiO2 films. J Photoch Photobio A 181:203–21410.1016/j.jphotochem.2005.11.026 ↗
10. Simonsen ME, Li Z, Sogaard EG (2009) Influence of the OH groups on the photocatalytic activity and photoinduced hydrophilicity of microwave assisted sol–gel TiO2 film. Appl Surf Sci 255:8054–806210.1016/j.apsusc.2009.05.013 ↗
11. Padmavathy N, Vijayaraghavan R (2008) Enhanced bioactivity of ZnO nanoparticles-an antimicrobial study. Sci Technol Adv Mater 9:03500410.1088/1468-6996/9/3/035004 ↗
12. Wang C, Chu X, Wu M (2006) Detection of H2S down to ppb levels at room temperature using sensors based on ZnO nanorods. Sens Actuat B-Chem 113:320–32310.1016/j.snb.2005.03.011 ↗
13. Moafi HF, Shojaie AF, Zanjanchi MA (2011) Photocatalytic self-cleaning properties of cellulosic fibers modified by nano-sized zinc oxide. Thin Solid Films 519:3641–364610.1016/j.tsf.2011.01.347 ↗
14. Behnajady MA, Modirshahla N, Hamzavi R (2006) Kinetic study on photocatalytic degradation of C.I. Acid Yellow 23 by ZnO photocatalyst. J Hazard Mater 133:226–23210.1016/j.jhazmat.2005.10.022 ↗
15. Talinungsang, Purkayastha DD, Krishna MG (2018) Dopant controlled photoinduced hydrophilicity and photocatalytic activity of SnO2 thin films. Appl Surf Sci 447:724–73110.1016/j.apsusc.2018.04.028 ↗
16. Liu Y, Koep E, Liu M (2005) A highly sensitive and fast-responding SnO2 sensor fabricated by combustion chemical vapor deposition. Chem Mater 17:3997–400010.1021/cm050451o ↗
17. Wang W, Zhu Y, Yang L (2007) ZnO–SnO2 hollow spheres and hierarchical nanosheets: hydrothermal preparation, formation mechanism. Adv Funct Mater 17:59–6410.1002/adfm.200600431 ↗
18. Cun W, Jincai Z, Xinming W, Bixian M, Guoying S, Pingan P, Jiamo F (2002) Preparation, characterization and photocatalytic activity of nano-sized ZnO/SnO2 coupled photocatalysts. Appl Catal B-Environ 39:269–27910.1016/S0926-3373(02)00115-7 ↗
19. Wang C, Wang X, Xu B, Zhao J, Mai B, Peng P, Sheng G, Fu J (2004) Enhanced photocatalytic performance of nanosized coupled ZnO/SnO2 photocatalysts for methyl orange degradation. J Photoch Photobio A-Chem 168:47–5210.1016/j.jphotochem.2004.05.014 ↗
20. Zhang M, An T, Hu X, Wang C, Sheng G, Fu J (2004) Preparation and photocatalytic properties of a nanometer ZnO–SnO2 coupled oxide. Appl Catal A 260:215–22210.1016/j.apcata.2003.10.025 ↗
21. Modirshahla N, Hassani A, Behnajady MA, Rahbarfam R (2011) Effect of operational parameters on decolorization of Acid Yellow 23 from wastewater by UV irradiation using ZnO and ZnO/SnO2 photocatalysts. Desalination 271:187–19210.1016/j.desal.2010.12.027 ↗
22. Hamrouni A, Lachheb H, Houas A (2013) Synthesis, characterization and photocatalytic activity of ZnO-SnO2 nanocomposites. Mater Sci Eng B 178:1371–137910.1016/j.mseb.2013.08.008 ↗
23. Liu R, Huang Y, Xiao A, Liu H (2010) Preparation and photocatalytic property of mesoporous ZnO/SnO2 composite Nanofibers. J Alloy Compd 503:103–11010.1016/j.jallcom.2010.04.211 ↗
24. Uddin Md, Nicolas Y, Olivier C, Toupance T, Servant L, Muller M, Kleebe H, Ziegler J, Jaegermann W (2012) Nanostructured SnO2−ZnO heterojunction photocatalysts showing enhanced photocatalytic activity for the degradation of organic dyes. Inorg Chem 51:7764–777310.1021/ic300794j ↗
25. Lamba R, Umar A, Mehta SK, Kansal SK (2015) Well-crystalline porous ZnO–SnO2 nanosheets: an effective visible-light driven photocatalyst and highly sensitive smart sensor material. Talanta 131:490–49810.1016/j.talanta.2014.07.096 ↗
26. Upadhaya D, Talinungsang, Kumar P, Purkayastha DD (2019) Tuning the wettability and photocatalytic efficiency of heterostructure ZnO-SnO2 composite films with annealing temperature. Mat Sci Semicon Proc 95:28–3410.1016/j.mssp.2019.02.009 ↗
27. Zhou M, Yu J, Liu S, Zhai P, Jiang L (2008) Effects of calcination temperatures on photocatalytic activity of SnO2/TiO2 composite films prepared by an EPD method. J Hazard Mater 154:1141–114810.1016/j.jhazmat.2007.11.021 ↗
28. Kaneva N, Stambolova I, Blaskov V, Dimitriev Y, Vassilev S, Dushkin C (2010) Photocatalytic activity of nanostructured ZnO films prepared by two different methods for the photoinitiated decolorization of malachite green. J Alloy Compd 500:252–25810.1016/j.jallcom.2010.04.020 ↗
29. Wenzel RN (1936) Resistance of solid surfaces to wetting by water. Ind Eng Chem 28:988–99410.1021/ie50320a024 ↗
30. Chen Y, Zhang Y, Shi L, Li J, Xin Y (2012) Transparent superhydrophobic/superhydrophilic coatings for self-cleaning and anti-fogging. Appl Phys Lett 101:03370110.1063/1.4737167 ↗
31. Chen Y, Zhang C, Huang W, Yang C, Huang T, Situ Y, Huang H (2013) Synthesis of porous ZnO/TiO2 thin films with superhydrophilicity and photocatalytic activity via a template-free sol–gel method. Surf Coat Tech 258:531–53810.1016/j.surfcoat.2014.08.042 ↗
32. Rezayi T, Entezari MH (2016) Wettability property varies with different morphologies of ZnO nanpoarticles deposited on glass and modified by stearic acid. New J Chem 40:2582–259110.1039/C5NJ02333E ↗
33. Owens DK, Wendt RC (1969) Estimation of the surface free energy of polymers. J Appl Polym Sci 13:1741–174710.1002/app.1969.070130815 ↗
34. Enesca A, Isac L, Duta A (2013) Hybrid structure comprised of SnO2, ZnO and Cu2S thin film semiconductors with controlled optoelectric and photocatalytic properties. Thin Solid Films 542:31–3710.1016/j.tsf.2013.06.008 ↗
35. Xu Y, Schoonen MAA (2000) The absolute energy positions of conduction and valence bands of selected semiconducting minerals. Am Mineral 85:543–55610.2138/am-2000-0416 ↗
36. Zhang L, Jaroniec M (2018) Toward designing semiconductor-semiconductor heterojunctions for photocatalytic applications. Appl Surf Sci 430:2–3810.1016/j.apsusc.2017.07.192 ↗