Effects of Functionalization of TiO2 Nanotube Array Sensors with Pd Nanoparticles on Their Selectivity

Sensors

Sunghoon Park²  Soohyun Kim²  Suyoung Park²  Wan In Lee¹ 

[1] Department of Chemistry, Inha University, 253 Yonghyun-Dong, Incheon 402-751, Korea; E-Mail:;Department of Materials Science and Engineering, Inha University, 253 Yonghyun-Dong, Incheon 402-751, Korea; E-Mails:

关键词: TiO₂;    nanotube;    gas sensor;    metal catalyst;    acetone;   

DOI  :  10.3390/s140915849

来源: mdpi

【 摘 要 】

This study compared the responses of Pd-functionalized and pristine titanate (TiO₂) nanotube arrays to ethanol with those to acetone to determine the effects of functionalization of TiO₂ nanotubes with Pd nanoparticles on the sensitivity and selectivity. The responses of pristine and Pd-functionalized TiO₂ nanotube arrays to ethanol gas at 200 °C were ∼2877% and ∼21,253%, respectively. On the other hand, the responses of pristine and Pd-functionalized TiO₂ nanotube arrays to acetone gas at 250 °C were ∼1636% and 8746% respectively. In the case of ethanol sensing, the response and recovery times of Pd-functionalized TiO₂ nanotubes (10.2 and 7.1 s) were obviously shorter than those of pristine TiO₂ nanotubes (14.3 and 8.8 s), respectively. In contrast, in the case of acetone sensing the response and recovery times of Pd-functionalized TiO₂ nanotubes (42.5 and 19.7 s) were almost the same as those of pristine TiO₂ nanotubes (47.2 and 17.9 s). TiO₂ nanotube arrays showed the strongest response to ethanol and Pd functionalization was the most effective in improving the response of TiO₂ nanotubes to ethanol among six different types of gases: ethanol, acetone, CO, H₂, NH₃ and NO₂. The origin of the superior sensing properties of Pd-functionalized TiO₂ nanotubes toward ethanol to acetone is also discussed.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.