TiO2-adding effects in WO3-based NO2 sensors prepared by coprecipitation and precipitation method

Dae Sik Lee; Sang Do Han; Sang Mun Lee; Jeung Soo Huh; Duk Dong Lee

doi:10.1016/S0925-4005(99)00441-4

TiO₂-adding effects in WO₃-based NO₂ sensors prepared by coprecipitation and precipitation method

Dae Sik Lee
, Sang Do Han
, Sang Mun Lee
, Jeung Soo Huh
, Duk Dong Lee

Kyungpook National University
Korea Institute of Energy Research

Research output: Contribution to journal › Conference article › peer-review

32 Scopus citations

Abstract

Two different sensing materials of TiO₂-WO₃ system with the grain size of nanometer are synthesized; one is a complete 2-nm-sized coprecipitate ((Ti,W)O₂) made by sol-coprecipitation of TiCl₄ and WCl₆, and the other is a complex 8-nm-sized material (TiO₂+WO₃) by mixing the sol-precipitation of TiCl₄ and WCl₆. The TiO₂-WO₃ system showed different characteristics between the coprecipitate and the complex material of TiO₂ and WO₃. The sensitivity and sorption properties were improved in the coprecipitate. In the coprecipitate, the sensitivity defined as R_G/R_A, where R_G and R_A are resistance in gas ambient and in air, respectively, was about 100 for 30 ppm NO₂ at 340 °C, which is suited for facility combustion furnace. The coprecipitated sensing materials had different resistance and grain size of 6 nm after calcination in air at 600 °C for 2 h. The properties of precursor have been investigated by SEM, X-ray diffraction (XRD) and BET analyses.

Original language	English
Pages (from-to)	331-335
Number of pages	5
Journal	Sensors and Actuators, B: Chemical
Volume	65
Issue number	1
DOIs	https://doi.org/10.1016/S0925-4005(99)00441-4
State	Published - 30 Jun 2000
Event	IMCS-7: 7th International Meeting on Chemical Sensors - Beijing, China Duration: 27 Jul 1998 → 30 Jul 1998

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@article{baf841c6a0874a41a01ed6fa41646365,

title = "TiO2-adding effects in WO3-based NO2 sensors prepared by coprecipitation and precipitation method",

abstract = "Two different sensing materials of TiO2-WO3 system with the grain size of nanometer are synthesized; one is a complete 2-nm-sized coprecipitate ((Ti,W)O2) made by sol-coprecipitation of TiCl4 and WCl6, and the other is a complex 8-nm-sized material (TiO2+WO3) by mixing the sol-precipitation of TiCl4 and WCl6. The TiO2-WO3 system showed different characteristics between the coprecipitate and the complex material of TiO2 and WO3. The sensitivity and sorption properties were improved in the coprecipitate. In the coprecipitate, the sensitivity defined as RG/RA, where RG and RA are resistance in gas ambient and in air, respectively, was about 100 for 30 ppm NO2 at 340 °C, which is suited for facility combustion furnace. The coprecipitated sensing materials had different resistance and grain size of 6 nm after calcination in air at 600 °C for 2 h. The properties of precursor have been investigated by SEM, X-ray diffraction (XRD) and BET analyses.",

author = "Lee, \{Dae Sik\} and Han, \{Sang Do\} and Lee, \{Sang Mun\} and Huh, \{Jeung Soo\} and Lee, \{Duk Dong\}",

year = "2000",

month = jun,

day = "30",

doi = "10.1016/S0925-4005(99)00441-4",

language = "English",

volume = "65",

pages = "331--335",

journal = "Sensors and Actuators, B: Chemical",

issn = "0925-4005",

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note = "IMCS-7: 7th International Meeting on Chemical Sensors ; Conference date: 27-07-1998 Through 30-07-1998",

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TY - JOUR

T1 - TiO2-adding effects in WO3-based NO2 sensors prepared by coprecipitation and precipitation method

AU - Lee, Dae Sik

AU - Han, Sang Do

AU - Lee, Sang Mun

AU - Huh, Jeung Soo

AU - Lee, Duk Dong

PY - 2000/6/30

Y1 - 2000/6/30

N2 - Two different sensing materials of TiO2-WO3 system with the grain size of nanometer are synthesized; one is a complete 2-nm-sized coprecipitate ((Ti,W)O2) made by sol-coprecipitation of TiCl4 and WCl6, and the other is a complex 8-nm-sized material (TiO2+WO3) by mixing the sol-precipitation of TiCl4 and WCl6. The TiO2-WO3 system showed different characteristics between the coprecipitate and the complex material of TiO2 and WO3. The sensitivity and sorption properties were improved in the coprecipitate. In the coprecipitate, the sensitivity defined as RG/RA, where RG and RA are resistance in gas ambient and in air, respectively, was about 100 for 30 ppm NO2 at 340 °C, which is suited for facility combustion furnace. The coprecipitated sensing materials had different resistance and grain size of 6 nm after calcination in air at 600 °C for 2 h. The properties of precursor have been investigated by SEM, X-ray diffraction (XRD) and BET analyses.

AB - Two different sensing materials of TiO2-WO3 system with the grain size of nanometer are synthesized; one is a complete 2-nm-sized coprecipitate ((Ti,W)O2) made by sol-coprecipitation of TiCl4 and WCl6, and the other is a complex 8-nm-sized material (TiO2+WO3) by mixing the sol-precipitation of TiCl4 and WCl6. The TiO2-WO3 system showed different characteristics between the coprecipitate and the complex material of TiO2 and WO3. The sensitivity and sorption properties were improved in the coprecipitate. In the coprecipitate, the sensitivity defined as RG/RA, where RG and RA are resistance in gas ambient and in air, respectively, was about 100 for 30 ppm NO2 at 340 °C, which is suited for facility combustion furnace. The coprecipitated sensing materials had different resistance and grain size of 6 nm after calcination in air at 600 °C for 2 h. The properties of precursor have been investigated by SEM, X-ray diffraction (XRD) and BET analyses.

UR - https://www.scopus.com/pages/publications/0034733316

U2 - 10.1016/S0925-4005(99)00441-4

DO - 10.1016/S0925-4005(99)00441-4

M3 - Conference article

AN - SCOPUS:0034733316

SN - 0925-4005

VL - 65

SP - 331

EP - 335

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

IS - 1

T2 - IMCS-7: 7th International Meeting on Chemical Sensors

Y2 - 27 July 1998 through 30 July 1998

ER -

TiO₂-adding effects in WO₃-based NO₂ sensors prepared by coprecipitation and precipitation method

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