The preparation and gas sensitivity study of polythiophene/SnO₂ composites

详细信息	查看全文 | 推荐本文 |

• 作者：Fanhong Kong ; Yan Wang ; Jun Zhang ; Huijuan Xia ; Baolin Zhu ; Yanmei Wang ; Shurong Wang ; Shihua Wu
• 关键词：Gas sensitivity ; Polythiophene ; SnO₂ ; Nanocomposites ; p– ; n junction
• 刊名：Materials Science and Engineering ; B
• 出版年：2008
• 期刊代码：76_09215107
• 类别：ch
• 出版时间：25 April 2008
• 卷：150
• 期：1
• 页码：6-11
• 文件大小：745 K

摘要

Nanocomposites of SnO₂ and polythiophene (PTP) were synthesized by the in situ chemical oxidative polymerization method. These nanocomposites were characterized by FTIR, transmission electron microscope (TEM), X-ray diffraction (XRD) and thermogravimetric and differential thermal analysis (TG–DTA) techniques, which proved the polymerization of thiophene monomer and the strong interaction between polythiophene and SnO₂. The composites were used for gas sensing to methanol (MeOH), ethanol (EtOH), acetone, and NO_x at different working temperature. It was found that PTP/SnO₂ materials with different PTP mass percent (1%, 5%, 10%, 20%and 30%) could detect NO_x with very higher selectivity and sensitivity at much lower working temperature than the reported SnO₂. The PTP/SnO₂ nanocomposites responded to NO_x at concentration as low as 10 ppm. PTP/SnO₂ composite containing 5 mass%PTP showed the highest sensitivity at room temperature. The sensing mechanism of PTP/SnO₂ nanocomposites to NO_x was presumed to be the effects of p–n heterojunction between PTP and SnO₂.