Fig. 1: NIR light-induced irreversible accumulated SERS behavior of the 4MBA/Ag/Ag-doped TiO2 hybrid system. | Nature Communications

Fig. 1: NIR light-induced irreversible accumulated SERS behavior of the 4MBA/Ag/Ag-doped TiO2 hybrid system.

From: Irreversible accumulated SERS behavior of the molecule-linked silver and silver-doped titanium dioxide hybrid system

Fig. 1

Three mechanisms are proposed to explain this phenomenon: (1) NIR light induces a thermal effect on the substrate, which results in higher crystallinity to change polarizability; (2) NIR light induces CT between the substrate and 4MBA with the assistance of VO defects; (3) the electrostatic attraction causes the reorientation of 4MBA molecule on the surface of the Ag/Ag-doped TiO2 substrate. Here, the green arrows represent the transfer path of electrons between the Ag/Ag-doped TiO2 substrate and 4MBA molecules, and the red arrows display filling of VO defect by oxygen atoms.

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