2021 Fiscal Year Annual Research Report
分子フィルタ・濃縮・センシング機能が融合した集積化化学センサシステムの創製
| Project/Area Number |
21F51365
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| Allocation Type | Single-year Grants |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
柳田 剛 東京大学, 大学院工学系研究科(工学部), 教授 (50420419)
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| Co-Investigator(Kenkyū-buntansha) |
LIU JIANGYANG 東京大学, 工学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2021-11-18 – 2024-03-31
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| Keywords | On-chip gas sensor / ZnO nanowire / filter / concentrator / hybrid gas sensor |
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| Outline of Annual Research Achievements |
In this research, the prime purpose is the integration of a on-chip toluene sensor with rarely interference of similar molecules for realizing tiny concentration target detection from human breath. Our strategy is based on a multi-step sensing: a molecule filter to eliminate the influence of oxygen-containing organic molecule, following a target toluene concentrator which could collect target from very tiny amount in gas phase, and finally sensing toluene from concentrated molecule by a sensitive gas sensor.
The progress is normally as expected. In the year of 2021, we successfully designed the substrate for selective zinc oxide nanowire growth on prepared pattern. This progress is essential for separating the filter, concentrator, and gas sensor. Toluene gas sensor could also be fabricated based on inclined nanowire bridging cross the designed channel with an excellent junction sensing performance. Through precisely control of edge shape of the ZnO seed layer, gas sensor with uniform sensing property is achievable. Furthermore, the zin oxide nanowire length could be systematically manipulated for optimizing molecule filtering effect and molecule concentration effect.
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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
Current progress successfully provides the opportunity for one-step integration of hybrid sensing device based on in-situ nanowire growth method. We have successfully solved the problem of nanowire inclining based on a novel edgeless seed layer for nanowire growth. Strong reliable gas sensor based on bridging nanowire optimized for seed layer shows its reproducibility for real application. The following research remains as surface modification on ZnO nanowire for fabricating effective filter which be able to eliminate oxygen-contained molecule, as well as surface modification for hydrocarbon concentration. Until now, the progress is conducted as expected and further research is continuing without serious hinderance.
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| Strategy for Future Research Activity |
後の研究の推進方策
In the future research, we will mainly focus on the modification of Zinc oxide nanowire to realize the hydrocarbon filter function and toluene concentration function.
1.For the hydrocarbon filtering nanowire, as we proposed, element bonding with carboxylate group or acid group has been proved much stronger than a mono-binding as carboxyl or hydroxyl group. Surface reaction control will be the key point to selective capture of oxygen-contained molecule and simultaneously pass hydrocarbon though. A hybrid element such as ZnSnO, ZnCuO has the potential since the mix cation surface is a strong candidate to be capable of tailoring surface Lewies properties. GC-MS measurement will be conducted to ensure the surface reaction and the filtering performance material.
2.For the toluene concentration nanowire, we plane to utilize Ru and Li to selectively recognize benzene-ring and get a bonding with the molecule which belong to aromatic group. In this process, the metal-ion to toluene reaction and binding will be evaluated by FT-IR and GC-MS together to deeply reveal the reaction mechanism.
3.Integration of on-chip toluene sensor and evaluation the sensing performance by bridging nanowire sensor after filtering away the interference of oxygen-contained molecule and concentrated toluene. We expected a excellent, selective and reliable toluene sensing performance even from a low concentration atmosphere.
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