NO₂ Gas Sensing Characteristics of SnO₂ Nanofiber-Based Sensors
Main Article Content
Abstract
In this work, the SnO₂ nanofibers (NFs) were directly synthesized through a electrospinning method following the annealing treatment process at 600°C for 3h. The morphological, compositional, crystal properties of material were characterized using field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), respectively. The FESEM images of SnO₂ NFs shows the typical spider-net like morphology with ~150 nm in diameter. Besides, the EDX spectrum reveals the presence of Sn and O atoms in the synthesized nanofibers. The XRD exhibited the formation of crystalline phases of tetragonal SnO₂. The gas sensing properties of fibers were tested towards NO₂ gas as a function concentration within a temperature range of 250 to 450°C. Under the optimal operating temperature of 350°C, the SnO₂ NF sensors can be detected NO₂ gas at low concentration down to 0.015 ppm. These results show its ability for NO₂ gas detection in gas sensor application.
Keywords
SnO₂, metal oxide, nanofibers, gas sensors, NO₂
Article Details
References
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[10] L. V. Thong, L. T. N. Loan, and N. Van Hieu, Comparative study of gas sensor performance of SnO₂ nanowires and their hierarchical nanostructures, Sensors Actuators, B Chem., vol. 150, no. 1, pp. 112–119, 2010.
[11] L. A. Currie, Nomenclature in evaluation of analytical methods including detection and quantification capabilities (IUPAC Recommendations 1995), Anal. Chim. Acta, vol. 391, no. 2, pp. 105–126, 1999.
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[13] National Institute for Occupational Safety and Health, Threshold Limit Values (TLV) and Immediately Dangerous to Life and Health (IDLH) values, Saf. Heal., p. 900, 2005.
[14] P. Feng, Q. Wan, and T. H. Wang, “Contact-controlled sensing properties of flowerlike ZnO nanostructures,” Appl. Phys. Lett., vol. 87, no. 21, pp. 1–3, 2005.
[15] N. As and G. A. S. S. Devices, Gas Sensing Devices Metal Oxide.
[16] N. G. Cho, D. J. Yang, M. J. Jin, H. G. Kim, H. L. Tuller, and I. D. Kim, Highly sensitive SnO₂ hollow nanofiber-based NO₂ gas sensors, Sensors Actuators, B Chem., vol. 160, no. 1, pp. 1468–1472, 2011.
[17] P. Rai and Y. T. Yu, Citrate-assisted hydrothermal synthesis of single crystalline ZnO nanoparticles for gas sensor application, Sensors Actuators, B Chem., vol. 173, no. 10, pp. 58–65, 2012.
[18] A. Mirzaei, B. Hashemi, and K. Janghorban, α-Fe₂O₃ based nanomaterials as gas sensors, J. Mater. Sci. Mater. Electron., vol. 27, no. 4, pp. 3109–3144, 2016.
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