研究目的
Investigating the effect of Mercaptopropyltriethoxysilane (MPTES) concentration on the selectivity and electrical response of nanostructure.
研究成果
The study established that nano-IDE behaves like a capacitive reactive model, which can be studied with reference to the capacitive model for performance including sensitivity. The electrical conductivity increases with the concentration of MPTES, indicating a decrease in the Si–arsenic bond length, which causes the bandgap to be shortened.
研究不足
The study focuses on the effect of MPTES concentration on the electrical response of nanostructure, but does not explore the potential for optimization of the surface modification process or the application of the sensor in real-world scenarios.
1：Experimental Design and Method Selection:
The nanostructure was prepared with clean booth for pattern transfer, followed by trimming and indentation using deep RIE coupled with oxidation furnace. The devices were kept in a cabinet at 700C to avoid humidity. MPTES of different concentrations were prepared and applied onto the Nano-IDE active domain.
2：Sample Selection and Data Sources:
Five concentrations of MPTES (1, 2, 3, 4, 5%) were prepared by diluting it with ethanol coupled with citric acid to maintain the pH level of the solution.
3：List of Experimental Equipment and Materials:
Deep RIE, oxidation furnace, impedance analyser, MPTES, ethanol, citric acid.
4：Experimental Procedures and Operational Workflow:
The reaction was monitored as the colour change gradually due to reaction from clear to milky white, creamy gelly was obtained. The prepared MPTES at different concentrations was deposited on the IDE active domain.
5：Data Analysis Methods:
The electrical properties of modified nano-IDE were tested using impedance analyser by observing the changes in impedance with the frequencies.
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