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Fabrication and NO2 gas sensing performance of TeO2-core/CuO-shell heterostructure nanorod sensors.

Park S, Kim S, Sun GJ, In Lee W, Kim KK, Lee C - Nanoscale Res Lett (2014)

Bottom Line: TeO2-nanostructured sensors are seldom reported compared to other metal oxide semiconductor materials such as ZnO, In2O3, TiO2, Ga2O3, etc.These responses were stronger than or comparable to those of many other metal oxide nanostructures, suggesting that TeO2 is also a promising sensor material.The responses of the core-shell nanorods were 1.2 to 2.1 times higher than those of pristine TeO2 nanorods over the same NO2 concentration range.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Republic of Korea.

ABSTRACT

Unlabelled: TeO2-nanostructured sensors are seldom reported compared to other metal oxide semiconductor materials such as ZnO, In2O3, TiO2, Ga2O3, etc. TeO2/CuO core-shell nanorods were fabricated by thermal evaporation of Te powder followed by sputter deposition of CuO. Scanning electron microscopy and X-ray diffraction showed that each nanorod consisted of a single crystal TeO2 core and a polycrystalline CuO shell with a thickness of approximately 7 nm. The TeO2/CuO core-shell one-dimensional (1D) nanostructures exhibited a bamboo leaf-like morphology. The core-shell nanorods were 100 to 300 nm in diameter and up to 30 μm in length. The multiple networked TeO2/CuO core-shell nanorod sensor showed responses of 142% to 425% to 0.5- to 10-ppm NO2 at 150°C. These responses were stronger than or comparable to those of many other metal oxide nanostructures, suggesting that TeO2 is also a promising sensor material. The responses of the core-shell nanorods were 1.2 to 2.1 times higher than those of pristine TeO2 nanorods over the same NO2 concentration range. The underlying mechanism for the enhanced NO2 sensing properties of the core-shell nanorod sensor can be explained by the potential barrier-controlled carrier transport mechanism.

Pacs: 61.46. + w; 07.07.Df; 73.22.-f.

No MeSH data available.


Related in: MedlinePlus

Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors. (a) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to NO2 as a function of the operation temperature. (b) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to different gases.
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Figure 4: Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors. (a) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to NO2 as a function of the operation temperature. (b) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to different gases.

Mentions: Figure 4a shows the responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod sensors to NO2 gas as a function of the operating time. The optimum operation temperature of TeO2/CuO core-shell nanorod sensor was 150°C, whereas that of the pristine TeO2 nanorod sensor was 175°C. This result reveals that encapsulation of TeO2 nanorods with a CuO thin film resulted in a 25°C decrease in operation temperature. Figure 4b exhibits the selectivity of the pristine and Bi2O3 nanoparticle-decorated In2O3 nanorod sensors to NO2 gas over other gases. The sensors showed the highest response to ethanol among different gases at the same concentration of 200 ppm at 150°C.


Fabrication and NO2 gas sensing performance of TeO2-core/CuO-shell heterostructure nanorod sensors.

Park S, Kim S, Sun GJ, In Lee W, Kim KK, Lee C - Nanoscale Res Lett (2014)

Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors. (a) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to NO2 as a function of the operation temperature. (b) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to different gases.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4256961&req=5

Figure 4: Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors. (a) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to NO2 as a function of the operation temperature. (b) Responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod gas sensors to different gases.
Mentions: Figure 4a shows the responses of the pristine TeO2 nanorod and TeO2/CuO core-shell nanorod sensors to NO2 gas as a function of the operating time. The optimum operation temperature of TeO2/CuO core-shell nanorod sensor was 150°C, whereas that of the pristine TeO2 nanorod sensor was 175°C. This result reveals that encapsulation of TeO2 nanorods with a CuO thin film resulted in a 25°C decrease in operation temperature. Figure 4b exhibits the selectivity of the pristine and Bi2O3 nanoparticle-decorated In2O3 nanorod sensors to NO2 gas over other gases. The sensors showed the highest response to ethanol among different gases at the same concentration of 200 ppm at 150°C.

Bottom Line: TeO2-nanostructured sensors are seldom reported compared to other metal oxide semiconductor materials such as ZnO, In2O3, TiO2, Ga2O3, etc.These responses were stronger than or comparable to those of many other metal oxide nanostructures, suggesting that TeO2 is also a promising sensor material.The responses of the core-shell nanorods were 1.2 to 2.1 times higher than those of pristine TeO2 nanorods over the same NO2 concentration range.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Republic of Korea.

ABSTRACT

Unlabelled: TeO2-nanostructured sensors are seldom reported compared to other metal oxide semiconductor materials such as ZnO, In2O3, TiO2, Ga2O3, etc. TeO2/CuO core-shell nanorods were fabricated by thermal evaporation of Te powder followed by sputter deposition of CuO. Scanning electron microscopy and X-ray diffraction showed that each nanorod consisted of a single crystal TeO2 core and a polycrystalline CuO shell with a thickness of approximately 7 nm. The TeO2/CuO core-shell one-dimensional (1D) nanostructures exhibited a bamboo leaf-like morphology. The core-shell nanorods were 100 to 300 nm in diameter and up to 30 μm in length. The multiple networked TeO2/CuO core-shell nanorod sensor showed responses of 142% to 425% to 0.5- to 10-ppm NO2 at 150°C. These responses were stronger than or comparable to those of many other metal oxide nanostructures, suggesting that TeO2 is also a promising sensor material. The responses of the core-shell nanorods were 1.2 to 2.1 times higher than those of pristine TeO2 nanorods over the same NO2 concentration range. The underlying mechanism for the enhanced NO2 sensing properties of the core-shell nanorod sensor can be explained by the potential barrier-controlled carrier transport mechanism.

Pacs: 61.46. + w; 07.07.Df; 73.22.-f.

No MeSH data available.


Related in: MedlinePlus