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. 2020 Dec 6;33(3):2005263. doi: 10.1002/adma.202005263

Figure 3.

Figure 3

Thermosensitive imaging with C18‐UCNCs. a) Schematic illustration for the thermosensitive imaging of surfaces containing C18‐UCNC patterns of “NEFU” during heating or under light illumination. b–d) Infrared images showing the temperature variations of a patterned glass slide (b), a patterned steel blade (c), and a sheet of patterned foil paper (d) on a heating plate at the set temperature of 50 °C. e–g) Infrared images showing the temperature variations of a patterned glass slide (e), a patterned steel blade (f), and a sheet of patterned foil paper (g) under simulated sunlight illumination. h) Time‐dependent infrared images showing temperature variations of the patterned glass slide on a heating plate with a tilt angle of 45° during heating from RT to the set temperature of 80 °C. The patterned letters “NE” are formed by stearic acid, and the letters “FU” are formed using C18‐UCNCs. The red arrows in (h) indicate the temperature of the corresponding area. The black arrows in (h1), (h2), and (h3) show the flow and leakage of stearic acid caused by melting.