Selective gas sensing response from different loading of Ag in sol-gel mesoporous titania powders

被引：33
作者：
Bahadur, Nupur [1 ]
Jain, Kiran [1 ]
Pasricha, Renu [1 ]
Govind [1 ]
Chand, Suresh [1 ]
机构：
[1] CSIR, Natl Phys Lab, New Delhi 110012, India
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2011年 / 159卷 / 01期
关键词：
Sol-gel; Ag loaded TiO2 powders; Gas sensor; Mesoporous titania; HRTEM of Ag-TiO2; PHOTOCATALYTIC OXIDATION; NANOPARTICLE LAYERS; TIO2; ETHANOL; ACETONE; SIZE; BEHAVIOR; ANILINE; SENSOR;
D O I：
10.1016/j.snb.2011.06.058
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Bare and Ag loaded TiO2 (0.05, 0.5, and 5.0 mol% Ag) powders prepared by sol-gel process have been used for the detection of ethanol. LPG, acetone and toluene gases. These materials were well characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) specific surface area analysis techniques. Specific surface area increased with increasing Ag loading in these mesoporous materials. A thorough TEM/HRTEM investigation with X-ray maps of the modified particles shows the extent of TiO2 surface coverage by Ag nanoparticles. From the comparative study of the sensor response of Ag-TiO2 powders for various gases, it is observed that each Ag loading resulted in the highest response towards a particular gas or in other words, every gas responded best towards a particular Ag loading of the sensor material, i.e. 0.05 mol% Ag-TiO2 sensor showed highest response towards ethanol, 0.5 mol% Ag-TiO2 sensor showed best response towards toluene, whereas, bare TiO2 proved to be the best sensor for both acetone and LPG gases. This establishes that Ag loading is not required for detection of acetone and LPG gases. On the basis of detailed materials characterization, a mechanism for the gas sensing response of each analyte has been discussed. (C) 2011 Elsevier B.V. All rights reserved.
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页码：112 / 120
页数：9
相关论文
共 38 条
[1]   Anatase TiO2 films based CO gas sensor:: Film thickness, substrate and temperature effects [J].
Al-Homoudi, Ibrahim A. ;
Thakur, J. S. ;
Naik, R. ;
Auner, G. W. ;
Newaz, G. .
APPLIED SURFACE SCIENCE, 2007, 253 (21) :8607-8614
[2]   XPS study of Nb-doped oxygen sensing TiO2 thin films prepared by sol-gel method [J].
Atashbar, MZ ;
Sun, HT ;
Gong, B ;
Wlodarski, W ;
Lamb, R .
THIN SOLID FILMS, 1998, 326 (1-2) :238-244
[3]   Effect of nominal doping of Ag and Ni on the crystalline structure and photo-catalytic properties of meso porous titania [J].
Bahadur, Nupur ;
Jain, Kiran ;
Srivastava, A. K. ;
Govind ;
Gakhar, Ruchi ;
Haranath, Divi ;
Dulat, M. S. .
MATERIALS CHEMISTRY AND PHYSICS, 2010, 124 (01) :600-608
[4]   Effect of silver doping on the phase transformation and grain growth of sol-gel titania powder [J].
Chao, HE ;
Yun, YU ;
Xingfang, HU ;
Larbot, A .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2003, 23 (09) :1457-1464
[5]   Low-temperature CO oxidation over CuO/Fe2O3 catalysts [J].
Cheng, Tao ;
Fang, Zhiyong ;
Hu, Qixiu ;
Han, Kaidong ;
Yang, Xiaozhi ;
Zhang, Youjin .
CATALYSIS COMMUNICATIONS, 2007, 8 (07) :1167-1171
[6]   Dynamic phenomena during the photocatalytic oxidation of ethanol and acetone over nanocrystalline TiO2:: simultaneous FTIR analysis of gas and surface species [J].
Coronado, JM ;
Kataoka, S ;
Tejedor-Tejedor, I ;
Anderson, MA .
JOURNAL OF CATALYSIS, 2003, 219 (01) :219-230
[7]   Doping semiconductor nanocrystals [J].
Erwin, SC ;
Zu, LJ ;
Haftel, MI ;
Efros, AL ;
Kennedy, TA ;
Norris, DJ .
NATURE, 2005, 436 (7047) :91-94
[8]   Solid-state physics - Doping the undopable [J].
Galli, G .
NATURE, 2005, 436 (7047) :32-33
[9]  
Georgieva VB, 2009, AIP CONF PROC, V1203, P1068, DOI 10.1063/1.3322312
[10]   Micromachined nanocrystalline silver doped SnO2H2S sensor [J].
Gong, JW ;
Chen, QF ;
Lian, MR ;
Liu, NC ;
Stevenson, RG ;
Adami, F .
SENSORS AND ACTUATORS B-CHEMICAL, 2006, 114 (01) :32-39
1234