scholarly journals Oxidation-Induced Surface Plasmon Band Fragmentation in Silver Clusters

2019 ◽  
Vol 124 (1) ◽  
pp. 968-975 ◽  
Author(s):  
Romain Schira ◽  
Franck Rabilloud
Keyword(s):  
Surface Plasmon ◽  
Silver Clusters ◽  
Surface Plasmon Band ◽  
Plasmon Band

scholarly journals Glucosamine Phosphate Induces AuNPs Aggregation and Fusion into Easily Functionalizable Nanowires

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 622 ◽  
Author(s):  
Álvaro Martínez ◽  
Yanchao Lyu ◽  
Fabrizio Mancin ◽  
Paolo Scrimin
Keyword(s):  
Aqueous Solution ◽  
Optical Properties ◽  
Surface Plasmon ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
Surface Plasmon Band ◽  
Acid Phosphate ◽  
Plasmon Band ◽  
Dimensional Distribution ◽  
Au Nanowires

The challenge to obtain plasmonic nanosystems absorbing light in the near infrared is always open because of the interest that such systems pose in applications such as nanotherapy or nanodiagnostics. Here we describe the synthesis in an aqueous solution devoid of any surfactant of Au-nanowires of controlled length and reasonably narrow dimensional distribution starting from Au-nanoparticles by taking advantage of the properties of glucosamine phosphate under aerobic conditions and substoichiometric nanoparticle passivation. Oxygen is required to enable the process where glucosamine phosphate is oxidized to glucosaminic acid phosphate and H2O2 is produced. The process leading to the nanosystems comprises nanoparticles growth, their aggregation into necklace-like aggregates, and final fusion into nanowires. The fusion requires the consumption of H2O2. The nanowires can be passivated with an organic thiol, lyophilized, and resuspended in water without losing their dimensional and optical properties. The position of the broad surface plasmon band of the nanowires can be tuned from 630 to >1350 nm.

Effect of clustering on the surface plasmon band in thin films of metallic nanoparticles

2014 ◽  
Vol 9 (1) ◽  
pp. 093796 ◽  
Author(s):  
Rui M. S. Pereira ◽  
Joel Borges ◽  
Filipa C. R. Peres ◽  
Paulo A. S. Pereira ◽  
Georgi V. Smirnov ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Plasmon ◽  
Metallic Nanoparticles ◽  
Surface Plasmon Band ◽  
Plasmon Band

Low Electric Field Intensity and Thermotropic Tuning Surface Plasmon Band Shift of Gold Island Film by Liquid Crystals

2012 ◽  
Vol 116 (4) ◽  
pp. 2720-2727 ◽  
Author(s):  
Jing Xie ◽  
Xuemin Zhang ◽  
Zenghui Peng ◽  
Zhanhua Wang ◽  
Tieqiang Wang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Surface Plasmon ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Island Film ◽  
Surface Plasmon Band ◽  
Band Shift ◽  
Plasmon Band

Anomalous Absorption of Isolated Silver Nanoparticulate Films in Visible Region of Electromagnetic Field

2008 ◽  
Vol 8 (2) ◽  
pp. 739-744 ◽  
Author(s):  
Sang Woo Kim ◽  
Bang Jae Hui ◽  
Dong-Sik Bae
Keyword(s):  
Silver Nanoparticles ◽  
Thermal Treatment ◽  
Absorption Band ◽  
Theoretical Prediction ◽  
Surface Plasmon ◽  
Anomalous Absorption ◽  
Surface Plasmon Band ◽  
Plasmon Band ◽  
Maximum Absorbance ◽  
Nanoparticulate Film

Anomalous absorption of isolated silver nanoparticulate films with different morphological patterns prepared by the wet colloidal route and followed by thermal treatment were investigated. A polymer embedded silver nanoparticulate film thermally treated at 200 °C showed maximum absorbance at ∼412 nm. The peakposition of the surface plasmon band was slightly different but still consistent with theoretical prediction derived by the Mie theory. An isolated nanopariculate film thermally treated at 300 °C showed anomalous absorption. Its maximum absorption band was shifted to green regime of 506.9 nm and the bandwidth at half-maximum absorbance of the surface plasmon band was greatly broadened. The plasmon band and its bandwidth were much deviated compared to the theoretical prediction calculated for the silver nanoparticles in the surrounding medium of air and poly(vinyl pyrrolidone) or soda-lime-silica glass. Even though there was no significant growth of silver nanoparticles during thermal treatment at 300 °C, the anomalous absorption was observed. The anomalous absorption was not attributed to effects of particle shape and size but to effects of pores induced by development of a great number of pores in the nanoparticulate film. The anomalous absorption greatly decreased with increase in heating temperature from 400 °C to 500 °C. The extraordinary plasmon damping of the isolated film decreased and the plasmon absorption band was re-shifted to violet regime of 416 nm because of large decrease in size of particles with dramatic change of pore morphology from circular pores with rim to small continuous pores induced by spontaneous formation of new silver nanoparticles.

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