研究目的
Investigating the pressure and temperature dependence of the frequency and amplitude of the field-induced oscillation created in a two-terminal device based on a vanadium dioxide thin film.
研究成果
The pressure and temperature dependence of the field-induced oscillation of VO2 was examined, showing linear pressure and temperature responses within specified ranges. These properties can be utilized for simultaneous monitoring of pressure and temperature in very small areas.
研究不足
The ambient temperature increase over 55°C causes the oscillation to decay and die out, restricting the measurement range if the VO2 device is used as a temperature sensor.
1:Experimental Design and Method Selection:
A simple oscillation circuit was constructed using a VO2-based two-terminal device, a standard resistor, and a DC power supply. The frequency and amplitude variation of the field-induced oscillation was observed for pressure changes applied to the VO2 device in a pressure chamber and for ambient temperature changes applied to the VO2 device using a plate heater.
2:Sample Selection and Data Sources:
VO2 thin films were deposited on sapphire substrates using a pulsed laser deposition method. The fabricated VO2 devices were used in the experiments.
3:List of Experimental Equipment and Materials:
Pressure chamber, plate heater (ASONE RSH-1DR), sourcemeter (Keithley 2410), oscilloscope (HP 54810A), VO2 thin film devices.
4:Experimental Procedures and Operational Workflow:
The oscillation characteristics were measured for pressure changes from 0 to 5 MPa and temperature changes from 25 to 50°C. The oscillation frequency and amplitude were recorded.
5:Data Analysis Methods:
Linear regression analysis was conducted on the measurement results to determine the pressure and temperature sensitivities of the oscillation frequency and amplitude.
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