Enhanced photoconductivity in silver nanoparticle ensembles owing to the excitations of localized surface plasmon polariton resonances (LSPPRs)

Autor:	V. V. Khromov, S. G. Przhibel'skii, Tigran A. Vartanyan, E. V. Vaschenko, Frank Hubenthal, N. B. Leonov
Rok vydání:	2010
Předmět:	Nuclear magnetic resonance Materials science Photoconductivity Surface plasmon Polariton Conductivity Molecular physics Surface plasmon polariton Plasmon Silver nanoparticle Localized surface plasmon
Zdroj:	SPIE Proceedings.
ISSN:	0277-786X
DOI:	10.1117/12.887582
Popis:	Electrical as well as photoelectrical properties of the metal nanoparticle ensembles (MNEs) were investigated. The exponential temperature dependence of the conductivity in the MNEs was obtained. Since lnIc depends linear on 1/T, an activation energy concept of the conductivity can be applied. An activation energy of Eact = 0.50 eV for Ag nanoparticles has been extracted. The photoconductivity of MNEs has been related to their extinction spectra. A clear evidence of the photoinduced conductivity of the MNEs was obtained. Considerable enhancement of the photocurrent was observed for those wavelengths that are in resonance with plasmon excitations localized in the metal nanoparticles forming the MNE. The increased photoconductivity can be explained by the additional energy placed in the nanoparticles due to the excitation of an LSPPR.
Databáze:	OpenAIRE
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