Scientists design simpler, more accurate nanothermometer

This drawing shows the oxidation process of temperature measurement using gallium-filled carbon nanotubes: (a) shows the nanotube before temperature measurement; in (b), the rising temperature causes the gallium to expand and rise, where the top of the gallium becomes oxidized; in (c), the falling temperature causes the gallium to contract, leaving the oxidized marker; and in (d), the original temperature is measured by reheating the nanotube up to the marker. Photo credit: Zongwen Liu, et al.