研究目的
Investigating the elastic behavior of silicon nanowires through three-point bending tests within a scanning electron microscope (SEM) to understand their mechanical properties and potential for incorporation in functional micromechanical devices.
研究成果
The study demonstrated the potential of the developed nanowire fabrication approach for the incorporation in functional micromechanical devices. The measured force-displacement curves yielded good correlation in comparison to simulated force-displacement curves with the modulus of elasticity taken as the bulk ?110? value of 169 GPa. No size effect on the elastic behavior of silicon was found within the considered size range.
研究不足
The study is limited by the uncertainties in length and force measurements, the potential for nanowire twisting during testing, and the influence of the native oxide layer on the smallest nanowires.
1:Experimental Design and Method Selection:
Three-point bending tests were performed on double-anchored, ?110? silicon nanowire samples in the vacuum chamber of a scanning electron microscope (SEM) via a micromanipulator equipped with a piezoresistive force sensor.
2:Sample Selection and Data Sources:
Nanowires with widths of 35 nm and 74 nm and a height of 168 nm were fabricated. The exact dimension of wire cross sections was determined by transmission electron microscopy (TEM).
3:List of Experimental Equipment and Materials:
A micromanipulator equipped with a cantilever-based force measurement tool from Kleindiek, Germany, was used. The nanowires were prepared in a monolithic process involving a series of etching processes.
4:Experimental Procedures and Operational Workflow:
The nanowires were bent at their midpoint with a silicon tip including a piezoresistive gage. The whole experiment was performed in situ within the vacuum chamber of the FIB/SEM at ambient temperature.
5:Data Analysis Methods:
The measured force-displacement behavior was compared with simulation results obtained by finite element modeling.
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