| 摘要 | Titania nanotube arrays (TNTA) were synthesized on a titanium substrate using anodic oxidation in an electrolyte containing ammonium fluoride and evaluated for low-temperature oxygen sensing. Their sensing properties were tested at different temperatures (50, 100, 150, 200, 250 and 300 degrees C) when exposed to various oxygen concentrations. The as-prepared TNTA are amorphous and exhibit much higher carrier concentration than that of annealed TNTA. Such amorphous TNTA show much higher sensitivity than that of annealed TNTA, SrTiO(3) and Ga(2)O(3) sensors. This sample demonstrates the lowest detectable oxygen concentration of 200 ppm, excellent recovery and good linear correlation at 100 degrees C. These results indicate that TNTA are indeed very attractive oxygen-sensing materials. |
| 部门归属 | [lu, hao feng; jiang, zhou hua] northeastern univ, sch met & mat, shenyang 110004, peoples r china. [lu, hao feng; li, feng; liu, gang; chen, zhi-gang; wang, da-wei; cheng, hui-ming] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [fang, hai-tao] harbin inst technol, sch mat sci & engn, harbin 150001, peoples r china. [lu, gao qing] univ queensland, australian inst bioengn & nanotechnol, brisbane, qld 4072, australia. [lu, gao qing] univ queensland, arc ctr excellence funct nanomat, sch engn, brisbane, qld 4072, australia.;lu, hf (reprint author), northeastern univ, sch met & mat, 11,lane 3,wenhua rd, shenyang 110004, peoples r china;jiangzh@smm.neu.edu.cn cheng@imr.ac.cn
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