2023 Fiscal Year Annual Research Report
Development of Nanofluidic Thermoelectric Devices Using Two-Dimensional Materials
| Project/Area Number |
22H01410
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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 |
徐 偉倫 東京大学, 大学院工学系研究科(工学部), 准教授 (50771549)
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| Co-Investigator(Kenkyū-buntansha) |
大宮司 啓文 東京大学, 大学院工学系研究科(工学部), 教授 (10302754)
江草 大佑 東京大学, 大学院工学系研究科(工学部), 助教 (80815944)
シャミン ジョバイル 東京大学, 大学院工学系研究科(工学部), 特任助教 (00933988)
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| Project Period (FY) |
2022-04-01 – 2026-03-31
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| Keywords | Nanopore / Two-dimensional material / Nanofabrication / Thermoelectrics |
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| Outline of Annual Research Achievements |
In this fiscal year, we summarized our collaborative work with Osaka University on nanofluidic thermoelectric cooling via the Peltier effect driven by charge-selective ion transport. We demonstrated that the nanopore temperature decreased with increasing transmembrane voltage in dilute electrolyte solutions, whereas the Joule heating effect is dominant at high salt concentrations. This unique characteristic may pave the way for the temperature control at the nanoscale. In the meanwhile, we have developed a method for nanopore fabrication on suspended two-dimensional materials. For a single nanopore, it can be drilled under transmission electron microscopy. Despite the precise fabrication, the process is expensive and time consuming. For practical applications, nanopore arrays are moredesired. On this account, we have developed a method for fabrication of large-scale suspended two-dimensional materials, which is suitable for nanopore array fabrication using lithography methods. Specifically, we have successfully transferred monolayer molybdenum disulfide onto a three-micron opening on a silicon nitride membrane. We first drilled an opening using focused ion beam milling on a silicon nitride membrane on top of a silicon substrate with an opening at its center. A monolayer molybdenum disulfide was transferred on top of the chip to cover the opening using a wet transfer method.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The progress is accelerated by efficient collaboration. We worked with a research group at Osaka University, which has related experience in the topic. We have frequent online meetings discussing the experimental results to improve our work. In the meanwhile, the smooth teamwork and outstanding graduate students in our lab greatly facilitated the research advances. We also benefitted from our previous experience in nanopore sensing, being a solid foundation of the development of this technology.
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| Strategy for Future Research Activity |
We will develop a lithography-based pore fabrication method for nanopore arrays on monolayer molybdenum disulfide. After that, atomic layer deposition will be conducted to shrink the pores down to the sub-5nm level. Following that, the thermoelectric properties of the nanofluidic system, including the Seebeck coefficient, power density and figure of merit will be experimentally measured and verified by a theoretical model based on the Poisson-Nernst-Planck equations.Finally, the optimal operating conditions will be proposed based on our research.
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