Fig. 4: Thermal mapping of a Joule-heated gold nanowire on glass and silicon substrates. | Nature Communications

Fig. 4: Thermal mapping of a Joule-heated gold nanowire on glass and silicon substrates.

From: Unprecedented switching endurance affords for high-resolution surface temperature mapping using a spin-crossover film

Fig. 4

a Experimental and b simulated temperature maps (ΔT) of the nanowire (80 µm × 1 µm × 50 nm) on glass, heated by the application of an electrical current of 4 mA. The pixel size of the experimental map is 1 × 1 µm2. Scale bar, 20 µm. c Typical ON-state (I = 4 mA) and OFF-state (I = 0) reflectivity curves measured in selected pixels, marked by crosses in a, at different distances (x = 0, 2, 10, and 50 µm) from the wire. Note that the reflectivity signal increases with Tb on the gold wire, but it goes down on glass. Solid lines are the results of a curve-fitting procedure using a sigmoidal function. The temperature shift between the two peaks in the corresponding derivative curves (dR/dTb vs. Tb) directly gives the average temperature rise in each pixel. d Experimental and e simulated temperature maps (ΔT) of an identical nanowire on top of a silicon substrate, Joule-heated by the application of an electrical current of 7 mA. The pixel size of the experimental map is 0.5 × 0.5 µm2. Scale bar, 10 µm.

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