Details

Autor(en) / Beteiligte

• Kim, Yong Shin
• Ha, Seung-Chul
• Kim, Kyuwon
• Yang, Haesik
• Choi, Sung-Yool
• Kim, Youn Tae
• Park, Joon T.
• Lee, Chang Hoon
• Choi, Jiyoung
• Paek, Jungsun
• Lee, Kwangyeol

Titel

Room-temperature semiconductor gas sensor based on nonstoichiometric tungsten oxide nanorod film

Ist Teil von

• Applied physics letters, 2005-05, Vol.86 (21), p.213105-213105-3

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Porous tungsten oxide films were deposited onto a sensor substrate with a Si bulk-micromachined hotplate, by drop-coating isopropyl alcohol solution of highly crystalline tungsten oxide ( W O 2.72 ) nanorods with average 75 nm length and 4 nm diameter. The temperature-dependent gas sensing characteristics of the films have been investigated over the mild temperature range from 20 to 250 ° C . While the sensing responses for ammonia vapor showed increase in electrical conductivity at temperatures above 150 ° C as expected for n -type metal oxide sensors, they exhibited the opposite behavior of unusual conductivity decrease below 100 ° C . Superb sensing ability of the sensors at room temperature in conjunction with their anomalous conductivity behavior might be attributed to unique nanostructural features of very thin, nonstoichiometric W O 2.72 .