采用简易水热法制备直径为10～20 nm、长几百纳米至几微米的六方相氧化钨纳米线,比表面积高达130.69 m~2/g.将该纳米线采用丝网印刷法制备成敏感膜,经350 ℃烧结1 h后测试其氨敏性能并分析其敏感机制.结果表明:在200～350 ℃的温度范围内,该敏感膜对低浓度氨气(1～100) μL/L具有较高的灵敏度(R_(air)/R_(NH_3)=4.0～18.8)、良好的重复性和很好的稳定性;对同一浓度的氨气,随测试温度的升高其灵敏度不断增大;在同一温度下,灵敏度随氨气浓度的增加基本上呈线性不断增大.
Hexagonal tungsten oxide nanowires were prepared by a simple hydrothermal method. The diameter of the nanowires is about 10～20 nm, the length is up to several micrometers and the specific area is 130.69 m~2/g. Thick film gas sensor was prepared by screen-printing technology and sintered at 350 ℃ for 1 h. The NH3 sensing properties and sensing mechanics at low concentrations (1-100 μL/L) were investigated in the temperature range from 200 to 350 ℃. It shows a high sensitivities (R_a/R_g) (4.0-18.8), good repeatability and stability. The sensitivity increased with increasing the operating temperature from 200 ℃ to 350 ℃ for the same NH_3 concentration. At the same temperature, the sensitivity increased almost linearly with increasing the concentration of NH_3 gas from 1-100 μL/L.
参考文献
| [1] | Xin H;Liang Y;Tanaka A.[A].Releigh:American Society of Agricultural,2003:12. |
| [2] | Stankova M;Vilanova X;Calderer J;Llobet E;Brezmes J;Gracia I;Cane C;Correig X .Sensitivity and selectivity improvement of rf sputtered WO3 microhotplate gas sensors[J].Sensors and Actuators, B. Chemical,2006(1):241-248. |
| [3] | Khatko V;Calderer J;Llobet E et al.[J].Sensors and Actuators B:Chemical,2005,109:128. |
| [4] | Jimenez I;Centeno MA;Scotti R;Morazzoni F;Arbiol J;Cornet A;Morante JR .NH3 interaction with chromium-doped WO3 nanocrystalline powders for gas sensing applications[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2004(15):2412-2420. |
| [5] | Wang G;Ji Y;Huang X R et al.[J].Journal of Physical Chemistry B,2006,110:23777. |
| [6] | Srivastava, V;Jain, K .Highly sensitive NH3 sensor using Pt catalyzed silica coating over WO3 thick films[J].Sensors and Actuators. B, Chemical,2008(1):46-52. |
| [7] | Xu Y X;Tang Z L;Zhang Z T .[J].Journal of the Chinese Ceramic Society,2009,37(03):49. |
| [8] | Williams D E .[J].Sensors and Actuators B:Chemical,1999,57:1. |
| [9] | Yamagoe N .[J].Surface Science,1979,86(05):335. |
| [10] | Azad A M;Akbat S A .[J].Journal of the Electrochemical Society,1992,139(12):690. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%