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In this paper, the aluminum/graphitic‑carbon nitride (Al/C3N4) loaded with various sizes of prismatic Ag nanoparticles (AgNPs) was facilely prepared. By means of XRD, XPS, Raman and fluorescence spectroscopy, it was demonstrated that strong interaction between Al/C3N4 and various sizes of prismatic AgNPs can be achieved, which was beneficial for the uniform distribution of AgNPs on surfaces of Al/C3N4. Interestingly, the change trend of AgNPs' size in Al/C3N4/Agx exhibited a distinct “W-shaped” with the increase of reduction time. Also, as the changing size of prismatic AgNPs, the surface-enhanced Raman scattering (SERS) intensity of brilliant blue on Al/C3N4/Agx showed the “M-shaped” based on the bands at 1166 cm−1, 1242 cm−1, 1580 cm−1, and 1606 cm−1. Moreover, the SERS spectra of brilliant blue and relative SERS intensities were hardly changed on the Al/C3N4/Ag168 substrate for 45 days or after seven recycles. In addition, brilliant blue, crystal violet and 4-aminothiophenol with low concentration can also be detected, which indicated that the Al/C3N4/Agx as a recyclable SERS substrate not only presented a continuous stability but also kept high sensitivity for detection of environmental pollutants.

In this paper, the aluminum/graphitic‑carbon nitride (Al/C 3 N 4) loaded with various sizes of prismatic Ag nanoparticles (AgNPs) was facilely prepared. By means of XRD, XPS, Raman and fluorescence spectroscopy, it was demonstrated that strong interaction between Al/C 3 N 4 and various sizes of prismatic AgNPs can be achieved, which was beneficial for the uniform distribution of AgNPs on surfaces of Al/C 3 N 4. Interestingly, the change trend of AgNPs' size in Al/C 3 N 4 /Ag x exhibited a distinct "W-shaped" with the increase of reduction time. Also, as the changing size of prismatic AgNPs, the surface-enhanced Raman scattering (SERS) intensity of brilliant blue on Al/C 3 N 4 /Ag x showed the "M-shaped" based on the bands at 1166 cm−1, 1242 cm−1, 1580 cm−1, and 1606 cm−1. Moreover, the SERS spectra of brilliant blue and relative SERS intensities were hardly changed on the Al/C 3 N 4 /Ag 168 substrate for 45 days or after seven recycles. In addition, brilliant blue, crystal violet and 4-aminothiophenol with low concentration can also be detected, which indicated that the Al/C 3 N 4 /Ag x as a recyclable SERS substrate not only presented a continuous stability but also kept high sensitivity for detection of environmental pollutants. Unlabelled Image • The controllable and recyclable SERS substrates of Al/C 3 N 4 /Ag x were fabricated. • The size of Ag x showed a "W-shaped" with increasing the reduction time. • SERS intensities of brilliant blue presented an "M-shaped" as the Ag x ′ size changes. • The limit of detection for brilliant blue is 5.38 × 10−11 mol·L−1. • Al/C 3 N 4 /Ag x can be used for cycled detection of environmental pollutants. [ABSTRACT FROM AUTHOR]