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01.12.2015 | Research Paper | Ausgabe 12/2015 Open Access

Journal of Nanoparticle Research 12/2015

End-to-end self-assembly of gold nanorods in isopropanol solution: experimental and theoretical studies

Journal of Nanoparticle Research > Ausgabe 12/2015
M. Gordel, K. Piela, R. Kołkowski, T. Koźlecki, M. Buckle, M. Samoć


We describe here a modification of properties of colloidal gold nanorods (NRs) resulting from the chemical treatment used to carry out their transfer into isopropanol (IPA) solution. The NRs acquire a tendency to attach one to another by their ends (end-to-end assembly). We focus on the investigation of the change in position and shape of the longitudinal surface plasmon (l-SPR) band after self-assembly. The experimental results are supported by a theoretical calculation, which rationalizes the dramatic change in optical properties when the NRs are positioned end-to-end at short distances. The detailed spectroscopic characterization performed at the consecutive stages of transfer of the NRs from water into IPA solution revealed the features of the interaction between the polymers used as ligands and their contribution to the final stage, when the NRs were dispersed in IPA solution. The efficient method of aligning the NRs detailed here may facilitate applications of the self-assembled NRs as building blocks for optical materials and biological sensing.

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