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a) Thermography of solid samples after irradiation by a 808 nm laser at a power density of 1 W cm−2 for 10 s. b) Images and thermography of deionized water, o‐W18O49, n‐W18O49, and r‐W18O49 after irradiation by a 808 nm laser at a density of 3.5 W cm−2 for 15 mins.
