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Sensors 2014, 14(9), 15849-15860; doi:10.3390/s140915849

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

1
Department of Materials Science and Engineering, Inha University, 253 Yonghyun-Dong, Incheon 402-751, Korea
2
Department of Chemistry, Inha University, 253 Yonghyun-Dong, Incheon 402-751, Korea
*
Author to whom correspondence should be addressed.
Received: 16 July 2014 / Revised: 8 August 2014 / Accepted: 12 August 2014 / Published: 27 August 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

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. View Full-Text
Keywords: TiO2; nanotube; gas sensor; metal catalyst; acetone TiO2; nanotube; gas sensor; metal catalyst; acetone
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Park, S.; Kim, S.; Park, S.; Lee, W.I.; Lee, C. Effects of Functionalization of TiO2 Nanotube Array Sensors with Pd Nanoparticles on Their Selectivity. Sensors 2014, 14, 15849-15860.

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