Fe-incorporated ZnO-TiO2 Nanocomposites for Improved CO2 Sensing
J. Environ. Nanotechnol., Volume 14, No 2 (June 2025) pp. 129-138
Abstract
The nanoscaled ZnO-TiO2 and Fe-incorporated ZnO-TiO2 nanocomposite powders were synthesized via hydrothermal route at 120℃ and characterized for their potential use in gas sensing application. Both ZnO-TiO2 and Fe-incorporated ZnO-TiO2 nanocomposites exhibit crystalline phases corresponding to hexagonal wurtzite ZnO and anatase TiO2. The average crystallite size of ZnO-TiO2 and 0.1, 0.2, 0.3, 0.4, 0.5 Fe-incorporated ZnO-TiO2 nanocomposites was determined to be 40.40, 31.36, 39.42, 30.62, 31.57, 29.73 nm, respectively. Formations of Zn-O-Ti bonds and Ti-O or Zn-O were confirmed by FTIR. Scanning electron microscopy images showed uniform porous grains of nanocomposites. The homogeneous incorporation of Fe without the formation of secondary iron phases and additional oxygen vacancies in Fe-doped samples were confirmed by EDAX. The thick film of ZnO-TiO2 and Fe-incorporated ZnO-TiO2 nanocomposites were fabricated using a traditional screen printing setup. Thick films exhibited a nonlinear I-V behavior, indicative of hybrid nature of the nanocomposites. The average thickness of undoped ZnO-TiO2 nanocomposite was found to be 30 μm. The CO2 sensing response with different compositions of Fe-incorporated ZnO-TiO2 results determined that 0.5 mol% Fe-incorporated ZnO-TiO2 nanocomposites (FZT5) showed the highest response to 286 ppm at ~280℃. Therefore, Fe-doped ZnO-TiO2 nanocomposites can be effective materials for real-time CO2 detection with excellent response and recovery times.
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Reference
Abdelkarem, K., Saad, R., Sayed, -E. A. M., Fathy, M. I., Shaban, M. and Hamdy, H., Design of high-sensitivity La-doped ZnO sensors for CO2 gas detection at room temperature, Sci. Rep., 13, 18398 (2023).
https://doi.org/10.1038/s41598-023-45196-y
Ahmad, S., Hussain, A., Mian, S. A., Rahman, G., Ali, S. and Jang, J., Sensing and conversion of carbon dioxide to methanol using Ag-decorated zinc oxide nanocatalys, Mater. Adv., 5(3), 1119-1129 (2024).
https://doi.org/10.1039/d3ma00705g
Alizadeh, E. and Baseri, H., Photocatalytic degradation of sumatriptan succinate by ZnO, Fe doped ZnO and TiO2-ZnO nanocatalysts, Mater. Chem. Horizons, 1(1), 7-21 (2022).
https://doi.og/10.22128/mch.2022.534.1002
Amouzesh, S. P., Khodadadi, A. A., Mortazavi, Y., Saris, S. and Asgari, M., MIL-100 (Fe)/ZnO nanocomposite sensors: An enhanced ammonia selectivity and low operating temperature, Sens. Actuators B: Chem., 399, 134791 (2024).
https://doi.org/10.1016/j.snb.2023.134791
Arias, J. N., Bonmatí, A., Prenafeta-Boldu, F. X. and Cerrillo, M., Determination of Carbon Dioxide by Gas Chromatography Using an Electron Capture Detector for the Analysis of Greenhouse Gases: A Comparison and Validation with the Standard Method, J. Chromatogr. A., 1745, 465750 (2025).
https://doi.org/10.1016/j.chroma.2025.465750
Cao, S., Sui, N., Zhang, P., Zhou, T., Tu, J. and Zhang, T., TiO2 nanostructures with different crystal phases for sensitive acetone gas sensors, J. Colloid Interface Sci., 607, 357-366 (2022).
https://doi.org/10.1016/j.jcis.2021.08.215
Davoodi, Y. and Shafeeyan, M. S., Tailoring photocatalytic performance through Fe-doped TiO2/ZnO for effective remediation of organic contaminants, Water Resour. Ind., 31, 100239 (2024).
https://doi.org/10.1016/j.wri.2024.100239
Deshmane, V. G.,Owen, S. L., Abrokwah, R. Y. and Kuila, D., Mesoporous nanocrystalline TiO2 supported metal (Cu, Co, Ni, Pd, Zn, and Sn) catalysts: Effect of metal-support interactions on steam reforming of methanol, J. Mol. Catal. A Chem., 408, 202-213 (2015).
https://doi.org/10.1016/j.molcata.2015.07.023
Haygood, K. J. F., Harnany, D., Jamasri., Santos, G. N. C. and Muflikhun, M. A., Promising CO2 gas sensor application of zinc oxide nanomaterials fabricated via HVPG technique, Heliyon., 10(17) (2024).
https://doi.org/10.1016/j.heliyon.2024.e36692
Kalyamwar, V. S. and Raghuwanshi, F. C., TiO2 modified ZnO thick film resistors as ammonia gas sensors, Adv. Mater. Lett. Rev., 4(12), 895-898 (2013).
https://doi.org/10.5185/amlett.2013.4456
Kanaparthi, S. and Singh, S. G., Chemiresistive sensor based on zinc oxide nanoflakes for CO2 detection, ACS Appl. Nano Mater., 2(2), 700-706 (2019).
https://doi.org/10.1021/acsanm.8b01763
Karthik, K., Pandian, S. K. and Jaya, N. V., Effect of nickel doping on structural, optical and electrical properties of TiO2 nanoparticles by sol-gel method, Appl. Surf. Sci., 256(22), 6829-6833 (2010)
https://doi.org/10.1016/j.apsusc.2010.04.096
Khoramshahi, V., Azarang, M., Nouri, M., Shirmardi, A. and Yousefi, R., Metal oxide/g-C3N4 nanocomposites chemiresistive gas sensors: a review on enhanced performance, Talanta Open, 9, 100290 (2024).
https://doi.org/10.1016/j.talo.2024.100290
Kumar, V., Singh, A., Yadav, B. C., Singh, H. K., Singh, D. P., Singh, S. K. and Chaurasiya, N., Environment-sensitive and fast room temperature CO2 gas sensor based on ZnO, NiO and Ni-ZnO nanocomposite materials, Env. Fun. Mat., 2(2), 167-177 (2023).
https://doi.org/10.1016/j.efmat.2023.12.002
Lai, C., Li, X., Liu, C., Guo, X., Xiang, Z., Xie, B. and Zou, L., Improvement in gravimetric measurement for determining the porosity and thickness of porous silicon using an optimized solution, Mat Sci Semicon Proc., 26, 501-505 (2014).
https://dot.org/10.1016/j.mssp.2014.05.046
Mardare, D., Adomnitei, C., Florea, D., Luca, D. and Yildiz, A., The effect of CO2 gas adsorption on the electrical properties of Fe doped TiO2 films, Physica B, 524, 17-21 (2017).
https://dx.doi.org/10.1016/j.physb.2017.08.029
Mazinani, B., Zalani, N. M., Sakaki, M. and Yanagisawa, K., Hydrothermal synthesis of mesoporous TiO2-ZnO nanocomposite for photocatalytic degradation of methylene blue under UV and visible light, J. Mater. Sci.: Mater. Electron., 29, 11945-11950 (2018).
https://doi.org/10.1007/s10854-018-9296-5
Onkar, S. G., Raghuwanshi, F. C., Patil, D. R. and Krishnakumar, T., Synthesis, characterization and gas sensing study of SnO2 thick film sensor towards H2S, NH3, LPG and CO2, Mater.Today Proc., 23, 190-201 (2020).
https://doi.org/10.1016/j.matpr.2020.02.017
Ortiz-Quinonez, J. L. and Pal, U., Interface engineered metal oxide heterojunction nanostructures in photocatalytic CO2 reduction: Progress and prospects, Coord. Chem. Rev., 516, 215967 (2024).
https://doi.org/10.1016/j.ccr.2024.215967
Pedhekar, R. B., Raghuwanshi, F. C. and Kapse, V. D., Low temperature H2S gas sensor based on Fe2O3 modified ZnO-TiO2 thick film, Int. J. Mater. Sci. Eng., 3(3), 219 (2015).
https://doi.org/10.17706/ijmse.2015.3.3.219-230
Saad, R., Abdelkarem, K., Sayed, -E. A. M., Shaban, M., Ahmed, I. A., Tammam, M. T. and Hamdy, H., Characterization and enhanced carbon dioxide sensing performance of spin-coated Na-and Li-doped and Co-doped cobalt oxide thin films, RSC Adv., 14(49), 36852-36867 (2024).
https://doi.org/10.1039/D4RA06847E
Sopiha, K. V., Malyi, O. I., Persson, C. and Wu, P., Chemistry of oxygen ionosorption on SnO2 surfaces, ACS Appl. Mater. Interfaces., 13(28), 33664-33676 (2021).
https://doi.org/10.1021/acsami.1c08236
Taha, I., Abdulhamid, Z. M., Straubinger, R., Emwas, A. H., Polychronopoulou, K. and Anjum, D. H., Ga-doped ZnO nanoparticles for enhanced CO2 gas sensing applications, Sci. Rep., 14, 29712 (2024).
https://doi.org/10.1038/s41598-024-1279-0
Tong, X., Shen, W., Zhang, X., Corriou, J. P. and Xi, H., Synthesis and density functional theory study of free-standing Fe-doped TiO2 nanotube array film for H2S gas sensing properties at low temperature, J. Alloys Compd., 832, 155015 (2020).
https://doi.org/10.1016/j.jallcom.2020.155015
Tsai, Y. T., Chang, S. J., Ji, L. W., Hsiao, Y. J., Tang, I. T., Lu, H. Y. and Chu, Y. L., High sensitivity of NO gas sensors based on novel Ag-doped ZnO nanoflowers enhanced with a UV light-emitting diode, ACS omega, 3(10), 13798-13807 (2018).
https://doi.org/10.1021/acsomega.8b01882
Tseng, L. T., Luo, X., Bao, N., Ding, J., Li, S. and Yi, J., Structures and properties of transition-metal-doped TiO2 nanorods, Mater. Lett., 170, 142-146 (2016).
http://dx.doi.org/10.1016/j.matlet2016.02.021
Wang, J., Wen, Z., Yang, B. and Yang, X., Optical carbon dioxide sensor based on fluorescent capillary array, Results Phys., 7, 323-326 (2017).
https://dx.doi.org/10.1016/j.rinp.2016.12.044
Yogasaraswathi, R. and Dheepa J., Effect of Manganese Doping in SnO2 Thin Films and its NO2 Gas Sensing Performance, J. Environ. Nanotechnol., 12(4), 01-08 (2023).
https://doi.org/10.13074/jent.2023.12.234476
Yu, H. and Obrovac, M. N., Quantitative determination of carbon dioxide content in organic electrolytes by infrared spectroscopy, J. Electrochem. Soc., 166(12), A2467 (2019).
https://doi.org/10.1149/2.0291912jes
Zhang, W. H., Zhang, W. D. and Zhou, J. F., Solvent thermal synthesis and gas-sensing properties of Fe-doped ZnO, J. Mater. Sci., 45(1), 209-215 (2010).
