TiO2是响应三甲胺(TMA)气体最佳的金属氧化物半导体材料,为保持TiO2基TMA旁热式气敏器件具有较高灵敏度和较低空气阻值(Ra),相应降低器件加热功率RH,本文通过N2气氛高温退火、高价Nb5+掺杂和长时间烧结等方法,提高TiO2基敏感材料电导率获得成功。实验与理论证明:降低氧分压可增强TiO2自身半导化程度;掺入10％左右Nb2O5,Nb5+替代Ti4+形成固溶体,可使TiO2得到最佳半导化效果;采用长时间的烧结处理,促使Ti3+转化为Ti4+,进一步提高材料电导率和器件稳定性,从而为制造低阻、高灵敏度、高选择性动物食品测鲜传感器开辟了一条新途径。
Titanium is a premium metal-oxide material sensitive to trimethylamine (TMA) gas. To obtain high
sensitivity and low power of elements, annealing in N2, doping with Nb5+ and long-time sintering were applied to improve the conductivity
of TiO2-based sensitive materials. It is concluded that low oxygen pressure can enhance self-semiconductorization. Doping with 10% Nb5+
that substitutes for Ti4+ and long-time sintering that promotes conversion from Ti3+ to Ti4+ can improve conductivity of material and
stability of elements. As a result, a new method is procured to make low-resistance sensor with high sensitivity and good selectivity.
参考文献
| [1] | Egashira M, Shimizu Y, Takao Y. Chem. Lett., 1988. 389--392. [2] Takao Y, Shimizu Y, Egashira M. Denki Kagaku, 1989, 57: 257--258. [3] Takao Y, Miya Y, Tachiyama Y, et al. Denki Kagaku, 1990, 58: 1162--1168. [4] Kwon Tae-Ha, Park Sung-Hyum, Ryu Jee-Youl, et al. Sensors and Actuators, 1998, B 46: 75--79. [5] Wei P H, Li G B, Zhao S Y, et al. J. Electrochem. Soc., 1999, 146 (9): 3536--3537. [6] 童茂松, 戴国瑞, 何秀丽, 等. 传感器技术, 2000, 19 (4): 5--6, 10. [7] Gashira M, Shimizu Y, Takao Y. Sensors and Actuators, 1990, B 1: 108--112. [8] 李新勇. 中国科学院兰州化学物理研究所博士学位论文, 1996, 第三部分. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%