Exceptional Two-Photon Absorption in Alkynylruthenium-Gold Nanoparticle Hybrids

Cristóbal Quintana; Mahbod Morshedi; Huan Wang; Jun Du; Marie P Cifuentes; Mark G Humphrey

doi:10.1021/acs.nanolett.8b03825

Exceptional Two-Photon Absorption in Alkynylruthenium-Gold Nanoparticle Hybrids

Nano Lett. 2019 Feb 13;19(2):756-760. doi: 10.1021/acs.nanolett.8b03825. Epub 2019 Jan 16.

Authors

Cristóbal Quintana¹, Mahbod Morshedi¹, Huan Wang¹, Jun Du¹, Marie P Cifuentes¹, Mark G Humphrey¹

Affiliation

¹ Research School of Chemistry , Australian National University , Canberra , ACT 2601 , Australia.

PMID: 30620605
DOI: 10.1021/acs.nanolett.8b03825

Abstract

Ruthenium alkynyl "star" complexes with tri(2-thienyl)-, tris(1,2,3-triazolyl)-, or triphenyl-benzene cores stabilize gold nanoparticles (AuNPs). Cyclic voltammetry, transmission electron microscopy, molecular modeling, dynamic light scattering, X-ray photoelectron spectroscopy, and energy-dispersive X-ray spectroscopy studies are consistent with ca. 5 trithienyl- or triazolyl-benzene-cored star complexes decorating the exterior of each AuNP. The ca. 2.5 nm diameter (by transmission electron microscopy) trithienylbenzene-cored gold nanoparticle hybrids are significantly less absorbent than classical Brust nanoparticles stabilized by 1-dodecanethiol; with femtosecond pulsed radiation, they exhibit exceptionally strong saturable absorption and two-photon absorption across the visible range and into the near-infrared region (3 000 000 GM at 500 nm and 46 000 GM at 750 nm; 1 GM is equal to 10^-50 cm⁴ s photon^-1).

Keywords: Gold nanoparticles; inorganic materials; metal alkynyl complexes; nonlinear optics; organometallics.

Publication types

Research Support, Non-U.S. Gov't