Abstract
In answer to Blakey’s comment concerning the role of solution absorbance on emission spectra of gold nanoparticles (AuNP) recorded under the resonance elastic light scattering (RELS) conditions of a synchronous scan with λem = λex, we provide new evidence of a complex behaviour of plasmonic responses of functionalized AuNP down to very low concentrations, CAuNP = 7 pM. We have demonstrated that there is no threshold on the RELS spectra and that from the lowest concentration under study there is a continuous shift of the RELS peak toward longer waves. Since the absorbance of a 7 pM AuNP solution is A < 0.008, there cannot be any direct effect of A on λmax for the RELS peak and the observed approximately-linear correlation between λmax and ASP is therefore an expression of a dependence of λmax on CAuNP.
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