Investigation of the Structural Properties and Electrical Responses of AZO Thin Films Deposited on Cotton Yarns

Öz

The development of functional textiles has gained increasing attention due to their potential applications in wearable electronics and sensor technologies. In this study, Al-doped ZnO (AZO) thin film coatings were deposited onto cotton yarns using the sol–gel dip-coating method. In addition to undoped ZnO coatings, two different AZO samples were prepared by adjusting the Al precursor content to 2 wt.% and 4 wt.% in the precursor solution. The morphological characteristics of the coatings were investigated by scanning electron microscopy (SEM), while their electrical responses were evaluated using an analog-to-digital converter microcontroller board-based measurement system. SEM analyses revealed that undoped ZnO coatings exhibited a more homogeneous and continuous surface morphology, whereas increasing Al doping led to enhanced surface roughness, agglomeration, and film discontinuities. Electrical measurements indicated that undoped ZnO samples showed stable but low electrical responses, while higher Al doping levels adversely affected electrical stability due to structural inhomogeneities. The results demonstrate that, for AZO thin films deposited on textile substrates under low-temperature processing conditions, surface uniformity and film continuity play a critical role in determining electrical behavior.

Anahtar Kelimeler

• Thin film
• Nanomaterial
• Cotton substrate
• Sol-gel
• Characterization
• Electrical properties

Pamuk İplikler Üzerine Biriktirilen AZO İnce Filmlerin Yapısal Özellikleri ve Elektriksel Yanıtlarının İncelenmesi

Öz

Fonksiyonel tekstillerin geliştirilmesi, giyilebilir elektronik ve sensör teknolojilerindeki potansiyel uygulamaları nedeniyle giderek artan bir ilgi görmektedir. Bu çalışmada, Al katkılı ZnO (AZO) ince film kaplamaları, sol-jel daldırma kaplama yöntemi kullanılarak pamuk ipliklerine uygulanmıştır. Katkısız ZnO kaplamalarına ek olarak, öncü çözeltideki Al öncü içeriği %2 ve %4 olacak şekilde ayarlanarak iki farklı AZO numunesi hazırlanmıştır. Kaplamaların morfolojik özellikleri taramalı elektron mikroskobu (SEM) ile incelenirken, elektriksel tepkileri analog-dijital dönüştürücü mikrokontrolör kart tabanlı bir ölçüm sistemi kullanılarak değerlendirilmiştir. SEM analizleri, katkısız ZnO kaplamalarının daha homojen ve sürekli bir yüzey morfolojisi sergilediğini, Al katkısının artmasının ise yüzey pürüzlülüğünü, kümelenmeyi ve film süreksizliklerini artırdığını ortaya koymuştur. Elektriksel ölçümler, katkısız ZnO numunelerinin kararlı ancak düşük elektriksel tepkiler gösterdiğini, daha yüksek Al katkılama seviyelerinin ise yapısal homojen olmama nedeniyle elektriksel kararlılığı olumsuz etkilediğini göstermiştir. Sonuçlar, düşük sıcaklık işleme koşulları altında tekstil alt tabakalara biriktirilen AZO ince filmler için yüzey düzgünlüğünün ve film sürekliliğinin elektriksel davranışı belirlemede kritik bir rol oynadığını göstermektedir.

Anahtar Kelimeler

• İnce film
• Nanomalzeme
• Pamuk altlık
• Sol-gel
• Karakterizasyon
• Elektriksel özellik

Kaynakça

1. Abbas, S. I., Alattar, A. M., & Al-Azawy, A. A. (2023). Enhanced ultraviolet photodetector based on Al-doped ZnO thin films prepared by spray pyrolysis method. Journal of Optics 2023 53:1, 53(1), 396-403. doi:10.1007/S12596-023-01164-3
2. Ahmed, G., Mohamed, W. S., Hasaneen, M. F., Ali, H. M., & Ibrahim, E. M. M. (2023). Optical, structural, electrical and photocatalytic properties of aluminum doped zinc oxide nanostructures. Optical Materials, 140, 113880. doi:10.1016/J.OPTMAT.2023.113880
3. Ahmed, S., Mazumdar, A. K. M. A. R., Syduzzaman, M., & Mahmud, M. S. (2024). UV Protection and Antimicrobial Properties of Textiles Using Nanotechnology. Materials Horizons: From Nature to Nanomaterials, Part F3464, 191-232. doi:10.1007/978-981-97-2696-7_8/FIGURES/6
4. Bin Choi, S., Veeralingam, S., Khanh, T. D., Choi, J. S., Kishore, K. R., Jung, S. B., & Kim, J. W. (2025). Rapid-response hybrid piezo-triboelectric pressure sensor using all-fabric materials for enhanced sensing and power generation. Nano Energy, 140, 111000. doi:10.1016/J.NANOEN.2025.111000
5. Bu, I. Y. Y. (2014). Sol–gel production of aluminium doped zinc oxide using aluminium nitrate. Materials Science in Semiconductor Processing, 27(1), 19-25. doi:10.1016/J.MSSP.2014.06.011
6. Chen, C. (2025). Hierarchical porous MXene/CNT composite fiber supercapacitors with cryogenic-tolerant performance for wearable energy storage devices. Chemical Engineering Journal, 520, 165708. doi:10.1016/J.CEJ.2025.165708
7. Duan, Y., Sun, Z., Zhang, Q., Dong, Y., Lin, Y., Ji, D., & Qin, X. (2025). Constructing electrospun 3D liquid metal adhesion channel on stretchable yarns for broad-range strain-insensitivity smart textiles. Nature Communications 2025 16:1, 16(1), 6362-. doi:10.1038/s41467-025-61444-3
8. Gozukizil, M. F., Nayman, E., Temel, S., & Gokmen, F. O. (2024). Comparison of gas sensing performances in various yarn types coated with polyaniline. Journal of Materials Science: Materials in Electronics 2024 35:7, 35(7), 529-. doi:10.1007/S10854-024-12106-5

9. Jiménez-González, A. E., Soto Urueta, J. A., & Suárez-Parra, R. (1998). Optical and electrical characteristics of aluminum-doped ZnO thin films prepared by solgel technique. Journal of Crystal Growth, 192(3-4), 430-438. doi:10.1016/S0022-0248(98)00422-9
10. Kong, L., Zhang, F., Wang, L., Ayiti, W., & Yao, Q. (2025). Nanocrystalline conductive thin films prepared by a novel micro-liquid droplet infiltration method on the surface of cotton yarns. doi:10.2139/SSRN.5464473
11. Marasini, S., Pandey, S., Ram Ghimire, R., & Subedi, P. (2025). Effect of Aluminum Doping on the Optical, Electrical, and Gas Sensing Properties of ZnO Thin Films. Progress in Physics of Applied Materials, 5(1), 1-9. doi:10.22075/PPAM.2024.35384.1118
12. Moussa, N. Ben, Lajnef, M., Jebari, N., Mahut, F., Bayle, F., Villebasse, C., … Herth, E. (2021). ZnO and Al-doped ZnO Sol-Gel Properties. 2021 Symposium on Design, Test, Integration and Packaging of MEMS and MOEMS, DTIP 2021. doi:10.1109/DTIP54218.2021.9568674
13. Nayman, E., Gözükızıl, M. F., & Usta, İ. (2024). Deposition of CdO Semiconductors on yarns by Dip Coating Method and Gas Sensor Applications. Tekstil ve Konfeksiyon. 34:2, 34(2), 117-126, 10.32710/tekstilvekonfeksiyon.1178133
14. Priyalakshmi Devi, K., Goswami, P., & Chaturvedi, H. (2022). Fabrication of nanocrystalline TiO2 thin films using Sol-Gel spin coating technology and investigation of its structural, morphology and optical characteristics. Applied Surface Science, 591, 153226. doi:10.1016/J.APSUSC.2022.153226
15. Sharma, N., & Kumar, R. (2024). Zinc doped TiO2 thin films for ethanol detection. Inorganic Chemistry Communications, 162, 112224. doi:10.1016/J.INOCHE.2024.112224
16. Shinde, P. G., Wani, S. M., Kotkar, M. T., Patil, A. G., & Jadhav, K. M. (2025). Enhanced surface morphology, electrical and optical properties of ZnO thin film deposited by the doctor blade method. Journal of Materials Science: Materials in Electronics 2025 36:24, 36(24), 1566-. doi:10.1007/S10854-025-15638-6
17. Sultana, R., Islam, K., & Chakraborty, S. (2024). Tuning Optical and Electrochemical Properties of Nb2O5 Thin Films via WO3 Doping. Transactions on Electrical and Electronic Materials 2024 26:1, 26(1), 48-59. doi:10.1007/S42341-024-00572-X
18. Sunil, A., Gopika, M. S., Jayasudha, S., & Nair, P. B. (2025). Enhanced Photocatalytic and Antimicrobial Activity of Zn Doped TiO2 Thin Films Synthesized via Sol-Gel Dip Coating Method. Journal of Inorganic and Organometallic Polymers and Materials 2025, 1-17. doi:10.1007/S10904-025-04058-Y
19. Tanveer, Z., Arhum, Usman, M., Tanveer, B., Iqbal, H., Cheema, S. A., … Javaid, M. A. (2025). Advancing conductive cellulosic textiles: Structural, optical and thermoelectric enhancements via innovative metallic oxide deposition. International Journal of Biological Macromolecules, 305, 141418. doi:10.1016/J.IJBIOMAC.2025.141418
20. Yahi, A. H., Kacha, A. H., Anani, M., & Salim, K. (2025). Optimizing Al-Doped ZnO Thin Films: Structural, Optical, and Electrical Enhancements for Solar Cells. Physics of the Solid State 2025 67:4, 67(4), 259-268. doi:10.1134/S1063783425600451
21. Zhang, W., Luan, S., Fang, Y., Zhu, L., Yang, Y., Tian, M., … Miao, J. (2025). Dynamic reversible thermochromic camouflage smart textiles for temperature visualized personal healthcare and thermal management. Chemical Engineering Journal, 523, 168746. doi:10.1016/J.CEJ.2025.168746