Metal clusters in plasma polymer matrices. Part III. Optical properties and redox behaviour of Cu clusters

2000 ◽  
Vol 2 (13) ◽  
pp. 3105-3110 ◽  
Author(s):  
Dirk Salz ◽  
Boris Mahltig ◽  
Alfred Baalmann ◽  
Michael Wark ◽  
Nils Jaeger
Keyword(s):  
Optical Properties ◽  
Metal Clusters ◽  
Polymer Matrices ◽  
Plasma Polymer ◽  
Redox Behaviour

Metal clusters in plasma polymer matrices

2002 ◽  
Vol 4 (11) ◽  
pp. 2438-2442 ◽  
Author(s):  
Dirk Salz ◽  
Michael Wark ◽  
Alfred Baalmann ◽  
Ulrich Simon ◽  
Nils Jaeger
Keyword(s):  
Metal Clusters ◽  
Polymer Matrices ◽  
Plasma Polymer

Metal clusters in plasma polymer matrices Part II. Silver clusters

1999 ◽  
Vol 1 (18) ◽  
pp. 4447-4451 ◽  
Author(s):  
Dirk Salz ◽  
Ryszard Lamber ◽  
Michael Wark ◽  
Alfred Baalmann ◽  
Nils Jaeger
Keyword(s):  
Metal Clusters ◽  
Polymer Matrices ◽  
Plasma Polymer ◽  
Silver Clusters

ChemInform Abstract: Metal Clusters in Plasma Polymer Matrices: Gold Clusters.

ChemInform ◽  
2010 ◽  
Vol 27 (1) ◽  
pp. no-no
Author(s):  
R. LAMBER ◽  
S. WETJEN ◽  
G. SCHULZ-EKLOFF ◽  
A. BAALMANN
Keyword(s):  
Metal Clusters ◽  
Gold Clusters ◽  
Polymer Matrices ◽  
Plasma Polymer

Synthesis of Transition Metal Clusters and Their Catalytic and Optical Properties

1992 ◽  
Vol 286 ◽  
Author(s):  
J. P. Wilcoxon ◽  
A. Martino ◽  
R.L. Baughmann ◽  
E. Klavetter ◽  
A.P. Sylwester
Keyword(s):  
Optical Properties ◽  
Metal Clusters ◽  
Control Strategies ◽  
Size Control ◽  
Transition Metal Clusters ◽  
X Ray ◽  
Surfactant Aggregates ◽  
Gold Silver ◽  
Pd Clusters ◽  
Average Size

ABSTRACTMetal Clusters may be synthesized in the interior of surfactant aggregates called inverse micelles. These nanosize chemical reactors permit the controlled growth of several types of metal clusters. We describe this process for the formation of Au, Ag, Pd, Pt and Ir clusters and cluster alloys. Two size-control strategies are described: 1)variation of micelle size by alteration of the surfacant and/or solvent combination used, and 2) judicious use of micelle interactions or phase behavior. Using these two methods size control in the range of 1-100 nm is possible. The optical properties of metal clusters of gold, silver, and gold/silver alloys are described and the surface plasmon resonances are shown to have dramatic blue shifts and extensive line broadening with decreasing size in the range of 10-1 nm. In the case of gold clusters, the distinct resonancein the visible disappears for sizes less than 2.0 nm and new features appear in the UV. The optical spectra of alloys of gold and silver are shown to differ dramatically from their homoatomic counterparts of the same average size. We use electron and X-ray diffraction to determine the phase structure of the metal clusters and small angle X-ray scattering, neutron scattering, light scattering and TEM to characterize the average size and size distributions of these clusters. Finally, we describe measurements of the catalytic activity of Pd clusters and demonstrate a dramatic increase in hydrogenation activity on the size range of 2-10 nm.

scholarly journals Ultrabright bimetallic AuAg complex: From luminescence mechanism to biological application

2020 ◽  
Vol 13 (05) ◽  
pp. 2041001 ◽  
Author(s):  
Junchi Chen ◽  
Lingfang Liu ◽  
Haile Liu ◽  
Yonghui Li ◽  
Junying Wang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Biomedical Applications ◽  
Density Functional ◽  
Metal Clusters ◽  
One Pot ◽  
Functional Theory ◽  
Two Photon ◽  
Photon Excitation ◽  
Lowest Unoccupied Molecular Orbital ◽  
Good Biocompatibility

Metal clusters have attracted wide interests due to their unique electronic and optical properties, but the low luminescence quantum yield (QY) prevents them from potential biomedical applications. In this work, silver-doped Au nanoclusters (NCs) are shown to be able to improve the QY of metal clusters. We succeeded in synthesizing ultrabright glutathione (GSH) protected AuAg clusters with 10.8% QY by a one-pot route. Their florescence is about 7.5 times brighter than pure Au NCs, with super photostability and good biocompatibility in physiological environment. Based on density functional theory (DFT) calculations, we investigated the electronic structures and optical properties of the AuAg NCs. The results show that the increase of the density of states of the lowest unoccupied molecular orbital (LUMO) leads to the fluorescence enhancement. In addition, two-photon excitation fluorescence imaging has been performed to show their great potential for biomedicine.

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