2021 Fiscal Year Annual Research Report
Digital detection of individual gas molecules in Time and Frequency space by Nanocavites integrated Graphene NanoElectroMechanical (NEM) Device
| Project/Area Number |
21H01386
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| Research Institution | Japan Advanced Institute of Science and Technology |
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Principal Investigator |
MURUGANATH AN.M 北陸先端科学技術大学院大学, 先端科学技術研究科, 講師 (20639322)
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| Co-Investigator(Kenkyū-buntansha) |
KAREEKUNNAN Afsal 北陸先端科学技術大学院大学, 先端科学技術研究科, 研究員 (90910779)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Random Telegraph Signals / Gas sensing / Suspended Graphene |
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| Outline of Annual Research Achievements |
The local bottom gated suspended graphene nanoribbon devices were fabricated with the various widths (from 0.5 to 1.0 μm) and lengths (from 0.5 to 2.0 μm). The resistance vs time was measured in argon gas environment for different pressures. The graphene resistance slowly changes during measurements, making it difficult to analyze the histogram and identify slower Random Telegraph Signals (RTS). To solve this issue, we used the windowed histogram method. The histogram of the resistance deviation to the mean is calculated only inside a window. Based on this method, the histogram of the entire signal showed two peaks for 0.1 Pa and 4 peaks for a pressure of 100 Pa. Therefore, the feasibility of this method was verified, and it can be helpful in gas identification through noise analysis.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
We have fabricated the suspended graphene nanoribbon devices with a improved design to avoid the collapse of the graphene onto the local bottom gate. Also, we have developed the low resistance measurement setup using delta measurement technique with a nanovolt resolution meter and a precision current source. As we have improved our device design and measurement setup, we are able to proceed the research steadily.
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| Strategy for Future Research Activity |
We will measure RTS signal for different gases using the Nanovoltmeter and Current source measurement setup. In order establish the individual RTS peaks corresponds to individual gas molecules, sensing measurements will be carried out at different pressures. Also, measurements will be conducted in five devices to confirm the origin of RTS signal from the gas molecules interaction with the suspended graphene. Based on these results, individual gas adsorption and desorption events will be clearly established. After that mixed gas measurements will be carried out.
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