Fabrication of Au nanoparticles embedded holey g-C3N4 as SERS substrates for sensitive and reliable detection

초록

Holey g-C3N4 (H-C3N4) with in situ grown Au nanoparticles (Au@H-C3N4) was synthesized to produce high performance and ultrasensitive SEAS active substrates. The H-C3N4 with the porous structure provided the support for embedding enough Au NPs, which avoided the aggregation of Au NPs on the surface of H-C3N4). The results showed that crystal violet as a Raman probe showed a detection level of 2.7 x 10(-9) M with an enhancement factor of 6.8 x 10(5). Au@H-C3N4 was used successfully to detect the residues of prohibited additives, melamine and sodium thiocyanate, from milk samples, which displayed a good linear range from 1 x 10(-4) to 5 x 10(-7) M (R-2 = 0.986) and 1 x 10(-3) to 5 x 10(-6) M (R-2 = 0.971), respectively. In this study, Au@H-C3N4 SEAS substrates with high sensitivity have high potential as SEAS platform for trace detection.

키워드