CuPc solution (10 mM) was mixed with MGT substrates with continuous stirring for 2 hours. After centrifugation at 8000 rpm for 5 min, the precipitate was collected and dispersed in 5 ml of DI water. The suspensions were illuminated under visible light (460 nm < λ < 700 nm, 1000 W) at different times. Then, the suspensions were separated through centrifugation at 8000 rpm for 5 min or magnetic separation and dispersed in 1 ml of ethanol. Last, 100-μl suspensions were dropped onto silicon foils and dried at room temperature. The silicon foils were measured by Raman spectroscopy under a 633-nm laser.

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