Graphene oxide–silver nanocomposite SERS substrate for sensitive detection of nitro explosives
Here, we carried out the sensing of nitro amine explosives through surface-enhanced Raman scattering (SERS) employing silver nanoparticle (Ag NP)-decorated reduced graphene oxide (rGO) nanocomposite substrate. In situ reduction process has been utilized to prepare the reduced graphene oxide–silver nanocomposite. The areal distribution and structural properties of Ag NPs have been studied. The fabricated nanocomposite was characterized using microscopic, spectroscopic and thermogravimetric methods. Moreover, the electrochemical properties of rGO–Ag nanocomposites were analysed using electrochemical methods. Raman spectra show the enhancement in the Raman signal of rGO-decorated Ag NPs with an intensity enhancement factor of 12.5 for D peak and 9 for G peak. The Ag NP-enriched rGO has also demonstrated strong SERS activity towards the detection of cyclotetramethylene tetranitramine and cyclotrimethylenetrinitramine up to 10−12 M as the limit of detection with SERS enhancement of 109. Thus, the synthesized nanocomposite shows potential applications for sensing of explosives.
The authors (PG and RR) acknowledge the support from the Director of Solid-State Physics Laboratory (SSPL) for her motivation and giving permission to publish this work.
- 9.K.M. Kosuda, J.M. Bingham, K.L. Wustholz, R.P. Van Duyne, Compr. Nanosci. Technol. 1–5, 263–301 (2010)Google Scholar
- 32.C.H. Chuang, Y.F. Wang, Y.C. Shao, Y.C. Yeh, D.Y. Wang, C.W. Chen, J.W. Chiou, S.C. Ray, W.F. Pong, L. Zhang, J.F. Zhu, J.H. Guo, Sci. Rep. 4, 1–7 (2014)Google Scholar