Development of Nanofluidic Thermoelectric Devices Using Two-Dimensional Materials

使用二维材料开发纳米流体热电器件

• 批准号: 22H01410
• 负责人: 徐 偉倫
• 金额: $ 11.15万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22H01410/
• 关键词: Nanopore technology; Thermoelectrics; Nanofluidics; Energy conversion; Nanopore; Two-dimensional material; Ion transport; Nnanofabrication; 2D materials

We have solidified the core technique for nanopore fabrication on suspended two-dimensional materials under transmission electron microscopy. Specifically, we demonstrated pore milling from sub-nanometer to 5 nanometers, showing the controllability of the pore dimension. A multiple drilling process is proposed and tested showing outstanding spacial resolution. For each drilling the pore size can be controlled within one nanometer. By repeating the process at slightly different locations, the desired pore shape can be precisely sculpted. Using this method, we have created sub-5 nanometer pores with high circularity. In the meanwhile, we have constructed the flow system for ionic current measurements through nanopore chips, temperature controllers for heat source and purchased current meters for thermoelectric evaluations. The temperature in the reservoirs separated by the nanopore membrane can be precisely controlled. On the other hand, a theoretical model based on the Poisson-Nernst-Planck and Navier-Stokes equations has been constructed to predict thermoelectric performance of our system. It is shown that the power density reaches the maximum as the characteristic electric double layer thickness becomes close to the pore radius. This will guide our experimental design by selecting suitable solution conditions.

我们巩固了在透射电子显微镜下悬浮的二维材料上纳米孔制造的核心技术。具体而言，我们证明了从子纳米到5纳米的孔隙铣削，显示了孔隙尺寸的可控性。提出了一个多个钻孔过程，并测试了出色的空间分辨率。对于每个钻孔，孔径可以在一个纳米内控制。通过在略有不同位置重复该过程，可以精确雕刻所需的孔形。使用这种方法，我们创建了高圆形的低5纳米孔。同时，我们通过纳米孔芯片，热源的温度控制器以及购买热电评估的电流仪表构建了离子电流测量的流系统。可以精确控制由纳米孔膜分离的储层中的温度。另一方面，已经构建了基于Poisson-Nernst-Planck和Navier-Stokes方程的理论模型，以预测系统的热电性能。结果表明，随着特征性的双层厚度接近孔半径，功率密度达到最大值。这将通过选择合适的解决方案条件来指导我们的实验设计。