A facile approach for fabrication of the gold nanorods (GNRs) monolayer films on quartz slides was exploited. The fabrication procedure just involved that the amino-functionalized quartz slides were immersed directly into the GNRs solutions which was prepared by seed-mediated method and treated with poly(vinyl pyrrolidone) (PVP). The intermolecular hydrogen bonds between the carbonyl groups on the PVP and the amino groups on the amino-functionalized quartz slide were responsible for the GNRs immobilization. The optical response in the visible and the near infrared region of resulting GNRs can be easily controlled simply by varying the immersion time of the substrates. GNRs monolayer films with subtle control over the surface coverage and tunable plasmon resonance as surface-enhanced Raman spectroscopy (SERS) substrates were investigated, which exhibited high SERS activity, stability and reproducibility.
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