2018 | ANNUAL REPORT 87 that Pt nanoparticles display good size and morphology uniformity with polyhedral structure. In order to extract thermal conduc- tivity with high accuracy, the width of the sensor must be much smaller than the thermal penetration depth. We optimized the aerosol jet printing parameter in order to print the 3-ω sensors with very fine microscale width. Figure 2 shows a printed silver sensor with 11.8 µm width with a small degree of overspray and non-uniformity in the sensor line width. Since the overspray consists primarily of