Scheme 1.

Self-assembly and NIR-responsive mechanism of GO-BNN6 sandwich structure, which was assembled by GO nanosheets and BNN6 molecules through π-π stacking. The integrated sandwich structure of GO-BNN6 absorbs NIR light via GO and transforms photons into active electron from GO to caged BNN6 (green lightning), and then excites BNN6 to decompose and release NO (yellow bubbles).