Plasmon excitation in C60 fullerene dimers

Small particles exhibit chemical and physical behaviors substantially different from bulk materials. This is due to the fact that boundary conditions can induce specific constraints on the observed properties. As an example, energy loss experiments carried out in an analytical electron microscope, constitute a powerful technique to investigate the excitation of collective surface modes (plasmons), which are modified in a limited size medium. In this work a STEM VG HB501 has been used to study the low energy loss spectrum (1-40 eV) of silicon spherical particles [1], and the spatial localization of the different modes has been analyzed through digitally acquired energy filtered images. This material and its oxides have been extensively studied and are very well characterized, because of their applications in microelectronics. These particles are thus ideal objects to test the validity of theories developed up to now.Typical EELS spectra in the low loss region are shown in fig. 2 and energy filtered images for the main spectral features in fig. 3.

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Investigation of cluster layers of small netal particles by TEM, SEM, EELS and by photoacoustic spectroscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174382 ◽

1990 ◽

Vol 48 (4) ◽

pp. 250-251

Author(s):

H. Seiler ◽

U. Haas ◽

K.H. Körtje

Keyword(s):

Bulk Material ◽

High Vacuum ◽

Optical Methods ◽

Metal Particles ◽

Silver Particles ◽

Low Loss ◽

Plasmon Excitation ◽

First Results ◽

Diffraction Patterns ◽

Small Metal Particles

The physical properties of small metal particles reveal an intermediate position between atomic and bulk material. Especially Ag has shown pronounced size effects. We compared silver layers evaporated in high vacuum with cluster layers of small silver particles, evaporated in N2 at a pressure of about 102 Pa. The investigations were performed by electron optical methods (TEM, SEM, EELS) and by Photoacoustic (PA) Spectroscopy (gas-microphone detection).The observation of cluster layers with TEM and high resolution SEM show small silver particles with diameters of about 50 nm (Fig. 1 and Figure 2, respectively). The electron diffraction patterns of homogeneous Ag layers and of cluster layers are similar, whereas the low loss EELS spectra due to plasmon excitation are quite different. Fig. 3 and Figure 4 show first results of EELS spectra of a cluster layer of small silver particles on carbon foil and of a homogeneous Ag layer, respectively.

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Enhanced Photocurrent Properties of Dye/Au-Loaded TiO2 Films by Grating-Coupled Surface Plasmon Excitation

IEICE Transactions on Electronics ◽

10.1587/transele.e96.c.385 ◽

2013 ◽

Vol E96.C (3) ◽

pp. 385-388 ◽

Cited By ~ 1

Author(s):

Hathaithip NINSONTI ◽

Weerasak CHOMKITICHAI ◽

Akira BABA ◽

Wiyong KANGWANSUPAMONKON ◽

Sukon PHANICHPHANT ◽

...

Keyword(s):

Surface Plasmon ◽

Tio2 Films ◽

Plasmon Excitation ◽

Surface Plasmon Excitation

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Enhancing the Output Performance of Triboelectric Nanogenerator via Grating‐Electrode‐Enabled Surface Plasmon Excitation

Advanced Energy Materials ◽

10.1002/aenm.201902725 ◽

2019 ◽

Vol 9 (44) ◽

pp. 1902725 ◽

Cited By ~ 9

Author(s):

Lingxiao Gao ◽

Xin Chen ◽

Shan Lu ◽

Hong Zhou ◽

Weibo Xie ◽

...

Keyword(s):

Surface Plasmon ◽

Triboelectric Nanogenerator ◽

Plasmon Excitation ◽

Output Performance ◽

Surface Plasmon Excitation

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Optical Properties of Sputtered Silver Granular Films

Materials Science Forum ◽

10.4028/www.scientific.net/msf.480-481.287 ◽

2005 ◽

Vol 480-481 ◽

pp. 287-292 ◽

Cited By ~ 2

Author(s):

S.E. Paje ◽

F. Teran ◽

J.M. Riveiro ◽

J. Llopis ◽

M.A. García ◽

...

Keyword(s):

Silver Nanoparticles ◽

Optical Properties ◽

Optical Absorption ◽

Surface Morphology ◽

Silver Clusters ◽

Plasmon Excitation ◽

Granular Films ◽

Silver Films ◽

Atomic Force ◽

Atomic Force Micrographs

In this research we study optical absorption and morphology of silver films prepared with a sputtering method. Silver granular films are obtained on a glass substrate for films with thickness smaller than about 60 Å. Superficial silver clusters of around 100 nm in diameter are clearly seen in the atomic force micrographs. The absorption of these samples are characterized by plasmon excitation in the 450-650 nm spectral range, which differs from the known excitation of silver nanoparticles fabricated by different techniques. The optical absorption of silver granular films depend on sputtering conditions like substrate temperature or deposition rate and correlates with the surface morphology.

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Influence of the Active Layer Structure on the Photovoltaic Performance of Water-Soluble Polythiophene-Based Solar Cells

Polymers ◽

10.3390/polym13101640 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1640

Author(s):

Massimiliano Lanzi ◽

Debora Quadretti ◽

Martina Marinelli ◽

Yasamin Ziai ◽

Elisabetta Salatelli ◽

...

Keyword(s):

Solar Cells ◽

Layer Structure ◽

Photovoltaic Performance ◽

Phase Segregation ◽

Water Soluble ◽

Polymerization Reaction ◽

Fullerene Derivative ◽

C60 Fullerene ◽

Photovoltaic Efficiency ◽

Single Material

A new side-chain C60-fullerene functionalized thiophene copolymer bearing tributylphosphine-substituted hexylic lateral groups was successfully synthesized by means of a fast and effective post-polymerization reaction on a regioregular ω-alkylbrominated polymeric precursor. The growth of the polymeric intermediate was followed by NMR spectrometry in order to determine the most convenient reaction time. The obtained copolymer was soluble in water and polar solvents and was used as a photoactive layer in single-material organic photovoltaic (OPV) solar cells. The copolymer photovoltaic efficiency was compared with that of an OPV cell containing a water-soluble polythiophenic homopolymer, functionalized with the same tributylphosphine-substituted hexylic side chains, in a blend with a water-soluble C60-fullerene derivative. The use of a water-soluble double-cable copolymer made it possible to enhance the control on the nanomorphology of the active blend, thus reducing phase-segregation phenomena, as well as the macroscale separation between the electron acceptor and donor components. Indeed, the power conversion efficiency of OPV cells based on a single material was higher than that obtained with the classical architecture, involving the presence of two distinct ED and EA materials (PCE: 3.11% vs. 2.29%, respectively). Moreover, the synthetic procedure adopted to obtain single material-based cells is more straightforward and easier than that used for the preparation of the homopolymer-based BHJ solar cell, thus making it possible to completely avoid the long synthetic pathway which is required to prepare water-soluble fullerene derivatives.

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