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Highly Sensitive H2S Sensor Based on the Metal-Catalyzed SnO2 Nanocolumns Fabricated by Glancing Angle Deposition.

Yoo KS, Han SD, Moon HG, Yoon SJ, Kang CY - Sensors (Basel) (2015)

Bottom Line: After annealing at 500 °C for 40 h, the sensors showed a polycrystalline phase with a porous, tilted columnar nanostructure.The gas sensitivities (S = Rgas/Rair) of Au and Ag-catalyzed SnO2 sensors fabricated by the GAD process were 0.009 and 0.015, respectively, under 5 ppm H2S at 300 °C, and the 90% response time was approximately 5 s.These sensors showed excellent sensitivities compared with the SnO2 thin film sensors that were deposited normally (glancing angle = 0°, S = 0.48).

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul 130-743, Korea. ksyoo@uos.ac.kr.

ABSTRACT
As highly sensitive H2S gas sensors, Au- and Ag-catalyzed SnO2 thin films with morphology-controlled nanostructures were fabricated by using e-beam evaporation in combination with the glancing angle deposition (GAD) technique. After annealing at 500 °C for 40 h, the sensors showed a polycrystalline phase with a porous, tilted columnar nanostructure. The gas sensitivities (S = Rgas/Rair) of Au and Ag-catalyzed SnO2 sensors fabricated by the GAD process were 0.009 and 0.015, respectively, under 5 ppm H2S at 300 °C, and the 90% response time was approximately 5 s. These sensors showed excellent sensitivities compared with the SnO2 thin film sensors that were deposited normally (glancing angle = 0°, S = 0.48).

No MeSH data available.


X-ray diffraction pattern of the SnO2 thin film.
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sensors-15-15468-f002: X-ray diffraction pattern of the SnO2 thin film.

Mentions: The XRD pattern of the SnO2 films is shown in Figure 2, and confirming that the as-deposited films were amorphous and the films annealed at 500 °C for 4 h were polycrystalline. The XRD peaks with a SnO2 tetragonal phase corresponded well with the JCPDS 41-1445 [30].


Highly Sensitive H2S Sensor Based on the Metal-Catalyzed SnO2 Nanocolumns Fabricated by Glancing Angle Deposition.

Yoo KS, Han SD, Moon HG, Yoon SJ, Kang CY - Sensors (Basel) (2015)

X-ray diffraction pattern of the SnO2 thin film.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541839&req=5

sensors-15-15468-f002: X-ray diffraction pattern of the SnO2 thin film.
Mentions: The XRD pattern of the SnO2 films is shown in Figure 2, and confirming that the as-deposited films were amorphous and the films annealed at 500 °C for 4 h were polycrystalline. The XRD peaks with a SnO2 tetragonal phase corresponded well with the JCPDS 41-1445 [30].

Bottom Line: After annealing at 500 °C for 40 h, the sensors showed a polycrystalline phase with a porous, tilted columnar nanostructure.The gas sensitivities (S = Rgas/Rair) of Au and Ag-catalyzed SnO2 sensors fabricated by the GAD process were 0.009 and 0.015, respectively, under 5 ppm H2S at 300 °C, and the 90% response time was approximately 5 s.These sensors showed excellent sensitivities compared with the SnO2 thin film sensors that were deposited normally (glancing angle = 0°, S = 0.48).

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul 130-743, Korea. ksyoo@uos.ac.kr.

ABSTRACT
As highly sensitive H2S gas sensors, Au- and Ag-catalyzed SnO2 thin films with morphology-controlled nanostructures were fabricated by using e-beam evaporation in combination with the glancing angle deposition (GAD) technique. After annealing at 500 °C for 40 h, the sensors showed a polycrystalline phase with a porous, tilted columnar nanostructure. The gas sensitivities (S = Rgas/Rair) of Au and Ag-catalyzed SnO2 sensors fabricated by the GAD process were 0.009 and 0.015, respectively, under 5 ppm H2S at 300 °C, and the 90% response time was approximately 5 s. These sensors showed excellent sensitivities compared with the SnO2 thin film sensors that were deposited normally (glancing angle = 0°, S = 0.48).

No MeSH data available.