2021 Fiscal Year Research-status Report
Development of Flexible Graphene-nanoribbon-base Biochemical Sensors with Highly Strain-controllable Selectivity and Reliability
| Project/Area Number |
21K20393
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| Research Institution | Tohoku University |
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Principal Investigator |
張 秦強 東北大学, 工学研究科, 特任助教 (90911082)
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| Project Period (FY) |
2021-08-30 – 2023-03-31
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| Keywords | Graphene nanoribbon / Biochemical sensor / Strain-induced / First-principles |
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| Outline of Annual Research Achievements |
The objective of this research project is to develop a theoretical model utilizing multi-scale simulation methods for clarifying the sensing mechanism under various gas environments and large range of cycled strain for designing highly sensitive and selective graphene nanoribbon based biochemical sensors with high reliability and long-term lifetime. This theoretical model is not only for clarifying the sensing mechanism and predicting the lifetime of graphene nanoribbon based biochemical sensors but also capable for analyzing other two-dimensional materials and thin metal films-based applications under the applying of cycled strain with different gas environments. The applicant has found the gradient Schottky barrier appeared around the interface between a metallic graphene nanoribbon and a semiconductive graphene nanoribbon. The gradient Schottky barrier shows an enhanced electronic performance on static properties and the dynamic properties of gradient Schottky barrier can be controlled by applying appropriate strain. The theoretical model possessing the behavior of localized gradient Schottky barrier based on the first-principles calculations was developed for investigating the charge transfer or electronic polarity of the electric field arise from the group of individual carbon atoms and adsorbed target molecules. The model was developed to understand the underlying sensing mechanism around the localized strain-field of target molecules and help for developing other low-dimensional biochemical sensors with high selectivity and sensitivity.
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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
Inspired by the group theory and field theory, a simple theoretical model was considered and developed to investigate the gas sensing mechanism at the localized adsorbed region of the graphene. The simple model was based on the simulation results by utilizing the first-principles calculations method. The strain-induced properties at the localized region were understood by considering the developed simple model. The simple model was applied on other atomic system as well and the analyzed results were reasonable. The simple model is believed to be available for other low dimensional biochemical sensing systems.
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| Strategy for Future Research Activity |
The applicant is going to discovery a new type of low dimensional materials for further development of biochemical sensors with strain-controlled selectivity, mainly in experiments. Based on the developed simple model, not only the strain-induced change of sensing behavior of a new low dimensional materials would be investigated, but also the probability of understanding the synthesizing behavior of low dimensional materials would be considered.
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