Thermal conductivity is an important property of materials for energy management. In phonon engineering at micro-nano scale, both cross-plane and in plane thermal conductivities are needed, especially to understand long distance propagation of heat carriers.
The objective is to detect Surface Phonon Polaritons (SPP) in polar materials, in other words to build ultra high resolution instrumentation at high temperature in vacuum.
We developed an electrical method called 3m for simultaneous crossplane and in-plane measurements. The system is fully automated by a Labview program and Matlab analysis. The system can conduct about 3000 experiments on a week, by selecting 4 sweeping parameters. The thermal conductivity is computed by advanced analytical models developed by J. Ordonez in our group.
Calibration was performed on borosilicate glass (bulk) with pattemed parallel metal strips (heater and sensor) of L=lmm long, separated by 20μm.
We also measured
1 ) Robustness of data by repeated experiments, on various devices/materials
2) Participate on the engineering of a prototype for measuring at extreme high temperature, especially for SPP detection.
Collaborators: Pr. Nomura, Pr Fujii, N. Clement
Keywords: Limms Internal Project, noise
Theroretical works developed in the Sensors axis showed that noise adds one more degree of freedom to understand and improve the sensitivity of (bio)electrochemical systems.
The goal is to verify the theoretical model (1_ Madrid) by experiments, and expand its usage in LIMMS for general interest.
We developed an instrumentation for automated noise measurement (Labview/Matlab) using low noise DC sources and amplifiers.
We tested the detection limit of the setup with resistances of 100kΩ, 200kΩ, IMΩ, IOMΩ, for 3 different DC sources, and extract the white noise statistics in real time.
Detection limit was almost achived. Artifact (jump at 0.5V; frequency bandwidth) have been evidenced and explained by the limited performances of the amplifier.