Cyanide-induced gold (AuNPs) dissolution has been used for a series of applications including cyanide quantification.  However, the AuNP structure and optical activity variation during the AuNP dissolution process are unclear.  Such information is critically important for addressing questions such as the rate and homogeneity of the metal critical dissolution process.  Using a combination of UV-vis extinction spectroscopy and recent polarized resonance synchronous spectroscopic (PRS2) method, we presented herein a systematic study of the effect of cyanide dissolution on the AuNP optical activities including its UV-vis extinction, absorption, scattering, and scattering depolarization as a function of the dissolution time. Both spherical and rod-shaped AuNPs are used in this study.  Effect of ligand-functionalized on the AuNP dissolution kinetics and homogeneity was investigated with AuNPs sequentially functionalized with thiolated polyethylene glycol (PEG) and small organothiols.  The finding should be important for understanding not only the AuNP dissolution processes but also for the structure and geometry of the multicomponent-functionalized AuNPs.<br/>

In-situ UV-vis and PRS2 monitoring gold nanoparticle structure and optical activity variations induced cyanide dissolution

255th National Meeting (2018)

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