Electron Injection Dynamics of RuII(4,4‘-dicarboxy-2,2‘-bipyridine)2 cis(NCS)2 Adsorbed on MoS2 Nanoclusters

• Published in: The journal of physical chemistry. B 1999-12, Vol.103 (50), p.11176-11180
• Main Authors: Langdon, B. T., MacKenzie, V. J., Asunskis, D. J., Kelley, D. F.
• Format: Article
• Language: English
• ISSN: 1520-6106; 1520-5207
• DOI: 10.1021/jp9930954

The electron injection dynamics of RuII(4,4‘-dicarboxy-2,2‘-bipyridine)2 cis(NCS)2 (N3 dye) adsorbed on MoS2 nanoclusters have been studied using static and time-resolved optical spectroscopy. Static spectroscopy and the comparison with RuII(2,2‘-bipyridine)2 cis(NCS)2 indicate that the N3 is bound to the MoS2 nanoclusters and that the binding occurs through the carboxylates. The static absorption spectrum of adsorbed N3/MoS2 is red shifted about 1.2 nm compared to N3 in an equivalent acetonitrile/hexanol/tridodecylmethylammonium iodide solution. The extent of the spectral shift indicates that the coupling is comparable to that in the N3/TiO2 case. The time-resolved results indicate that about 35% of the adsorbed dyes inject electrons into the MoS2 conduction band on the 250 ps time scale, and about 65% do not inject. These results indicate that electron injection is comparatively slow in these systems (250 ps compared to