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Chemical Transformation of Nanorods to Nanowires: Reversible Growth and Dissolution of Anisotropic Gold Nanostructures.
ACS Nano 2019 Februrary 13
This manuscript describes a reversible wet chemical process for the tip selective one-dimensional (1D) growth and dissolution of gold nanorods (AuNRs) and gold nanowires (AuNWs). Tip selective dissolution was achieved by oxidation of AuNRs with Au(III)/CTAB complex, whereas the growth of AuNRs was carried out by the reduction of Au(I) ions on AuNRs surface with a mild reducing agent, ascorbic acid (AA). Both the dissolution and growth processes are highly tip selective and proceed exclusively in one dimension. Decrease in the aspect ratio (AR) of AuNRs during the dissolution resulted in the blue shift in the longitudinal plasmon band (LPB) position and red shifts in LPB position were achieved by increasing the AR by 1D-growth of AuNRs. Both growth and dissolution processes are fully controllable and can be stopped and resumed at any given time when desired AR and/or LPB position is achieved. In addition, the tip selective 1D growth of AuNRs can be continued with the additional supply of Au(I)/CTAB/AA solution to produce extremely long gold nanowires (AuNWs).
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