Ethanol Sensing Characteristics of Sn-Doped ZnO Tetrapods Sensor

Abstract:

Sn-doped ZnO tetrapods (T-SnZnO) were successfully synthesized using a simple thermal oxidation reaction method. Zn powder with 20 mol% of Sn powder was used as raw material and synthesized at temperature of 1,000°C under normal atmosphere. FE-SEM images revealed that the T-SnZnO exhibited a four symmetry legs with the length of 1.94±0.42 μm and the width of 260±40 nm. EDS analysis confirmed that the tetrapods contain small amount of Sn. XRD analysis indicated that the tetrapods exhibited a wurtzite hexagonal ZnO structure corresponded to Raman results. The lattice parameters a and c were 3.2494 Å and 5.2057 Å, respectively. The T-SnZnO were fabricated as ethanol sensor and tested with ethanol concentration of 50, 200, and 1,000 ppm at operating temperature between 280°C-340°C by observing I-V curve of the sensors. The sensor response increased as the increasing of the operating temperature and the ethanol concentration. Moreover, the enhancement of ethanol sensor response was observed, and the highest sensor response of 30.4 was detected at 340°C. The sensor response was higher than those of ZnO tetrapods, TiO₂-ZnO tetrapods, ZnO nanowires, and TiO₂-ZnO nanowires sensors.

• Periodical: Advanced Materials Research (Volume 770)
• Pages: 185-188
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.770.185
• Online since: September 2013
• Authors: Theerapong Santhaveesuk, Supab Choopun
• Keywords: Doping, Gas Sensor, Tetrapods, Thermal Oxidation, Zinc Oxide (ZnO)

References

[1] M.W. Ahn, K.S. Park, J.H. Heo, J.G. Park, D.W. Kim, K.J. Choi, et al., Gas sensing properties of defect-controlled ZnO-nanowire gas sensor, Appl. Phys. Lett. 93 (2008) 263103-1-3.

DOI: 10.1063/1.3046726

[2] K. Zheng, H. Shen, J. Li, D. Sun, G. Chen, K. Hou, et al., The fabrication and properties of field emission display based on ZnO tetrapod-liked nanostructure, Vacuum 83 (2008) 261-264.

DOI: 10.1016/j.vacuum.2008.07.010

[3] Y.F. Hsu, Y.Y. Xi, C.T. Yip, A.B. Djurišić, W.K. Chan, Dye-sensitized solar cells using ZnO tetrapods, J. Appl. Phys. 103 (2008) 083114-1-4.

DOI: 10.1063/1.2909907

[4] Y. Qiu, S. Yang, ZnO nanotetrapods: Controlled vapor-phase synthesis and application for humidity sensing, Adv. Funct. Mater. 17 (2007) 1345-1352.

DOI: 10.1002/adfm.200601128

[5] X. Xu, X. Duan, Z. Yi, Z. Zhou, X. Fan, Y. Wang, Photocatalytic production of superoxide ion in the aqueous suspensions of two kinds of ZnO under simulated solar light, Catal. Commun. 12 (2010) 169-172.

DOI: 10.1016/j.catcom.2010.09.006

[6] T. Santhaveesuk, D. Wongratanaphisan, S. Choopun, Enhancement of sensor response by TiO2 mixing and Au coating on ZnO tetrapod sensor, Sens. Actuators, B 147 (2010) 502-507.

DOI: 10.1016/j.snb.2010.03.081

[7] D. Calestani, M. Zha, R. Mosca, A. Zappettini, M.C. Carotta, V.D. Natale, et al., Growth of ZnO tetrapods for nanostructure-based gas sensors, Sens. Actuators, B 144 (2010) 472-478.

DOI: 10.1016/j.snb.2009.11.009

[8] Y. Zeng, T. Zhang, L. Wang, M. Kang, H. Fan, R. Wang, et al., Enhanced toluene sensing characteristics of TiO2-doped flowerlike ZnO nanostructures, Sens. Actuators, B 140 (2009) 73-78.

DOI: 10.1016/j.snb.2009.03.071

[9] T. Santhaveesuk, D. Wongratanaphisan, S. Choopun, Enhancement of ethanol sensing properties by alloying TiO2 with ZnO tetrapods, IEEE Sens. J. 10 (2010) 39-43.

DOI: 10.1109/jsen.2009.2036048

[10] S.H. Huang, Z. Chen, X.C. Shen, Z.Q. Zhu, K. Yu, Raman scattering of single tetrapod-like ZnO nanostructure synthesized by catalyst-free rapid evaporation, Solid State Commun. 145 (2008) 418-422.

DOI: 10.1016/j.ssc.2007.11.014

[11] K. Park, K.Y. Ko, Effect of TiO2 on high-temperature thermoelectric properties of ZnO, J. Alloys Compd. 430 (2007) 200-204.

DOI: 10.1016/j.jallcom.2006.04.065

[12] M-H. Seo, Study on high-sensitive gas sensor using tubular structure of TiO2-based nanoparticle, Ph.D. Thesis, Kyushu University (2010)

[13] T. Santhaveesuk and S. Choopun: submitted to Journal of Alloys and Compounds (2013)