First-principles study of the electronic structure and NO2-sensing properties of Ti-doped W18O49 nanowire

Qin Yu-Xiang; Liu Mei; Hua De-Yan

doi:10.7498/aps.63.207101

Abstract

The geometry and band structures as well as the density of states of Ti-doped nonstoichiometric W18O49 nanowire are studied by employing the ab-initio plane-wave ultra-soft pseudo potential technique based on the density functional theory. Meanwhile, the adsorption and NO2-sensing properties of the doped nanowire are analyzed by further calculating the adsorption energy, planar averaged charge density difference and atomic Mulliken charge population of the NO2/Ti-W18O49 nanowire adsorption system. The results reveal that Ti-doping modifies the electronic structure and then the gas sensitivity of W18O49 nanowire obviously. After Ti-doping, new electronic states are introduced and the band structure near Fermi level (EF) is changed obviously, resulting in the variation of the band gap and EF position and then the increase of electronic conductivity. The adsorbed NO2 molecule acts as a charge accepter to extract electrons from the conduction band of W18O49 nanowire, causing the gas-sensing response due to the conductivity change of the nanowire. NO2 adsorption on Ti-doped W18O49 nanowire can cause more electrons to transfer from nanowire to NO2 molecule than the case on pure W18O49 nanowire, theoretically suggesting the validity of Ti-doping that can improve the sensitivity of W18O49 nanowire. The population calculations on different gas molecules adsorbed on Ti-doped W18O49 nanowire further indicate the much good sensitivity and selectivity of the doped nanowire to NO2 gas.

Keywords:

Authors and contacts

1.
School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China
Funds: Project supported by the National Natural Science Foundation (Grant Nos. 61274074, 61271079) and the Tianjin Natural Science Foundation, China (Grant No. 11JCZDJC15300).

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Cited By

[1]	Baeck S H, Choi K S, Jaramillo T F, Stucky G D, McFarland E W 2003 Adv. Mater. 15 1269
[2]	Li X L, Lou T J, Sun X M, Li Y D 2004 Inorg. Chem. 43 5442
[3]	Santato C, Odziemkowski M, Ulmann M, Augustynski J 2001 J. Am. Chem. Soc. 123 10639
[4]	Rout C S, Ganesh K, Govindaraj A, Rao C N R 2006 Appl. Phys. A: Mater. 85 241
[5]	Gerlitz R A, Benkstein K D, Lahr D L, Hertz J L, Montgomery C B, Bonevich J E, Semancik S, Tarlov M J 2009 Sens. Actuators B 136 257
[6]	Qin Y X, Li X, Wang F, Hu M 2011 J. Alloy Compd. 509 8401
[7]	Kukkola J, Mohl M, Leino A R, Möklin J, Halonen N, Shchukarev A, Konya Z, Jantunen H, Kordas K 2013 Sens. Actuat. B 186 90
[8]	Jabeen M, Iqbal M A, Kumar R V, Ahmed M, Javed M T 2014 Chin. Phys. B 23 018504
[9]	Qin Y X, Sun X B, Li X, Hu M 2012 Sens. Actuators B 162 224
[10]	Shen Y B, Yamazaki T, Liu Z F, Meng D, Kikuta T, Nakatani N, Saito M, Mori M 2009 Sens. Actuat. B 135 524
[11]	Kim Y S, Ha S C, Kim K, Yang H, Choi S Y, Kim Y T, Park J T, Lee C H, Choi J, Paek J, Lee K 2005 Appl. Phys. Lett. 86 213105
[12]	Hu M, Zhang J, Wang W D, Qin Y X 2011 Chin. Phys. B 20 082101
[13]	Shim Y S, Zhang L H, Kim D H, Kim Y H, Choi Y R, Nahm S H, Kang C Y, Lee W Y, Jang H W 2014 Sens. Actuat. B 198 294
[14]	Oison V, Saadi L, Lambert-Mauriat C, Hayn R 2011 Sens. Actuat. B 160 505
[15]	Liu F, Guo T Y, Xu Z, Gan H B, Li L F, Chen J, Deng S Z, Xu N S, Golberg D, Bando Y 2013 Mater. Chem. C 1 3217
[16]	Qin Y X, Hu M, Zhang J 2010 Sens. Actuat. B 150 339
[17]	Chen C H, Wang S J, Ko R M, Kuo Y C, Uang K M, Chen T M, Liou B W, Tsai H Y 2006 Nanotechnology 17 217
[18]	Hu W B, Zhao Y M, Liu Z L, Dunnill C W, Gregory D H, Zhu Y Q 2008 Chem. Mater. 20 5657
[19]	Huang R, Zhu J, Yu R 2009 Chin. Phys. B 18 3024
[20]	Sun S B, Zhao Y M, Xia Y D, Zou Z D, Min G H, Zhu Y Q 2008 Nanotechnology 19 305709
[21]	Li Y F, Zhou Z, Chen Y S, Chen Z F 2009 J. Chem. Phys. 130 204706
[22]	Li Z B, Wang X, Jia L C, Chi B 2014 J. Mol. Struct. 1061 160
[23]	Zhang M, Shi J J 2014 Chin. Phys. B 23 017301
[24]	Ji Y J, Du Y J, Wang M S 2013 Chin. Phys. B 22 117103
[25]	Zhang P, Liu Y, Yu H, Han S H, Lu Y B, Lu M S, Cong W Y 2014 Chin. Phys. B 23 026103
[26]	Hou Q Y, Dong H Y, Ying C, Ma W 2012 Acta Phys. Sin. 61 167102 (in Chinese) [侯清玉, 董红英, 迎春, 马文 2012 61 167102]
[27]	Hou Q Y, Zhao C W, Jin Y J, Guan Y Q, Lin L, Li J J 2010 Acta Phys. Sin. 59 4156 (in Chinese) [侯清玉, 赵春旺, 金永军, 关玉琴, 林琳, 李继军 2010 59 4156]
[28]	Hariharan V, Parthibavarman M, Sekar C 2011 J. Alloys Compd. 509 4788
[29]	Vo T, Williamson A J, Galli G 2006 Phys. Rev. B 74 045116
[30]	Jin L, Lou S Y, Kong D G, Li Y C, Du Z L 2006 Acta Phys. Sin. 55 4809 (in Chinese) [靳联, 娄世云, 孔德国, 李藴才, 杜祖亮 2006 55 4809]
[31]	Zhou Z, Zhao J J, Chen Y S, Schleyer P V R, Chen Z F 2007 Nanotechnology 18 424023
[32]	Wanbayor R, Ruangpornvisuti V 2012 Appl. Surf. Sci. 258 3298
[33]	Breedon M, Spencer M J S, Yarovsky I 2010 J. Phys. Chem. C 114 16603

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Vol. 63, Issue 20 - 2014-10-20

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