Black indium oxide a photothermal CO₂ hydrogenation catalyst.

The resulting Raman signals for S4 exhibit blue shift with increasing beam intensities (0.00110, 0.00055, 0.00028, and 0.00011 mW μm −2 ) gradually shift from 304.18 to 302.90, 302.68 and 300.63 cm −1 and indicates an increasing trend of photothermal local temperatures.

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