2018 Fiscal Year Annual Research Report
分子認識界面に立脚した選択部-センサ一体型システムによる肺がんマーカー分子の識別
| Project/Area Number |
18J12622
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| Research Institution | Kyushu University |
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Principal Investigator |
ZHU Zetao 九州大学, 総合理工学府, 特別研究員(DC2)
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| Project Period (FY) |
2018-04-25 – 2020-03-31
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| Keywords | Metal oxide nanowires / Vapor liquid solid / Impurity doping / Carrier density control / Doping homogeneity |
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| Outline of Annual Research Achievements |
Wide range control of a carrier density has played an essential role on developments of semiconductor devices. However, such control of carrier density via an impurity doping has been impossible for semiconducting oxide nanowires due to the occurrence of unintentional carrier doping. Here we demonstrate 6 orders of magnitude control of conductivity of Sb-doped SnO2 nanowires grown via true vapor-liquid-solid (VLS) process. Strictly tailoring two crystal growth interfaces (liquid-solid: LS and vapor-solid: VS) is required to suppress an unintentional carrier doping in presence of impurity dopants. This wide range electrical controllability of single crystalline oxide nanowires will be a foundation to design various electronic device applications utilizing their semiconducting properties.
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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
In this year, I conduct the research about the crystal growth and impurity doping behavior of single crystal metal oxide nanowires fabricated via vapor-liquid-solid (VLS) process. In details, the impact of interfacial (LS and VS) selective growth on the electrical transport property of impurity doped nanowires is clarified. Here 6 orders of magnitude control of electrical conductivity of single crystalline Sb-doped SnO2 nanowires is demonstrated. This electrical conductivity range via an intentional impurity doping is the widest of the ones in metal oxide semiconducting nanowires reported so far. This wide range electrical conductivity controllability of single crystalline metal oxide nanowires will be a foundation for the various electronic device applications.
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| Strategy for Future Research Activity |
VOCs (volatile organic compounds) detection/discrimination in human’s exhaled breath by electronic devices is a crucially important issue in terms of the disease-related biomarkers. In this work, I propose an original selector/sensor device system to distinguish a lung cancer marker of nonanal (C9 aldehyde) among the similar molecules of octanal and decanal (C8 and C10 aldehyde).
In this year, the details of research plan is as follows. 1) Adsorption mechanism of nonanal on Sb-SnO2 nanowire array will be studied by combining the p-MAIRS, photoluminescence characterization, and molecular simulation. 2) The electrical discrimination of nonanal among mixtures of C8, C9, C10 aldehyde will be demonstrated using the on-chip selector-sensor devices based on the results obtained so far.
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Research Products
(3 results)
