Terahertz emission from graphene/semicnductor junctions and its application to gas sensors
Project/Area Number |
25630149
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Electron device/Electronic equipment
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Research Institution | Osaka University |
Principal Investigator |
TONOUCHI MASAYOSHI 大阪大学, レーザーエネルギー学研究センタ, 教授 (40207593)
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Project Period (FY) |
2013-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
Keywords | グラフェン / テラヘルツ / 表面反応 / ガスセンサー |
Outline of Final Research Achievements |
We demonstrate a new approach to visualize the distribution of molecular adsorbates on graphene using terahertz emission spectroscopy and imaging. We found that the waveforms of terahertz radiation from graphene-coated InP sensitively changed with the type of the atmospheric gas, the laser illumination time. The terahertz waveform change is explained through band structure modifications in the InP surface depletion layer due to the presence of localized electric dipoles induced by adsorbed oxygen. These results demonstrate that terahertz emission serves as a local probe for monitoring adsorption and desorption processes on graphene films and devices, suggesting a novel two-dimensional sensor for detecting local chemical reactions.
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Report
(3 results)
Research Products
(15 results)
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[Presentation] Monitoring of molecular adsorption and desorption dynamics on graphene using terahertz emission2014
Author(s)
I. Kawayama, Y. Sano1, M. Tabata, K. Salek, M. Murakami1, M. Wang, R. Vajtai, J. Kono, P. M. Ajayan and M. Tonouchi
Organizer
4th EOS Topical Meeting on Terahertz Science & Technology
Place of Presentation
Hotel Cenobio dei Dogi, Camogli, Italy
Year and Date
2014-05-11 – 2014-05-14
Related Report
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[Presentation] Terahertz time-domain spectroscopy of large-area graphene on various substrates2014
Author(s)
Iwao Kawayama , Makoto Ohshiro , Yuki Sano , Hironaru Murakami , James Allred , Minjie Wang , Junichiro Kono , Robert Vajtai , Pulickel Ajayan , Masayoshi Tonouchi
Organizer
APS March meeting 2014
Place of Presentation
Denver, USA
Related Report
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[Presentation] Gase sensing using on terahertz emissions from graphene-coated InP surfaces2014
Author(s)
Masayoshi Tonouchi, Iwao Kawayama, Yuki Sano, Khandoker Abu Salek, Hironaru, Murakami, Mika Tabata, Minjie Wang, Robert Vajtai, Junichiro Kono, Pulickel M. Ajayan
Organizer
APS March meeting 2014
Place of Presentation
Denver, USA
Related Report
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