ACS Nano, 2014, 8 (4), pp 3575–3583.
Lena Yadgarov †, Charina L. Choi ‡, Anastasiya Sedova †, Ayala Cohen §, Rita Rosentsveig †, Omri Bar-Elli ⊥, Dan Oron ⊥, Hongjie Dai ‡, Reshef Tenne †*
† Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel and
‡ Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States and
§ Department of Materials Engineering,Ben Gurion University, Beer Sheva, Israel and
⊥ Department of Physics of Complex Systems,Weizmann Institute of Science, Rehovot 76100, Israel.
The optical and electronic properties of suspensions of inorganic fullerene-like nanoparticles of MoS2 are studied through light absorption and zeta-potential measurements and compared to those of the corresponding microscopic platelets. The total extinction measurements show that, in addition to excitonic peaks and the indirect band gap transition, a new peak is observed at 700–800 nm. This spectral peak has not been reported previously for MoS2. Comparison of the total extinction and decoupled absorption spectrum indicates that this peak largely originates from scattering. Furthermore, the dependence of this peak on nanoparticle size, shape, and surface charge, as well as solvent refractive index, suggests that this transition arises from a plasmon resonance.
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