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Size and Temperature Effects on the Surface Plasmon Resonance in Silver Nanoparticles |
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| Authors: | Oleg A Yeshchenko Igor M Dmitruk Alexandr A Alexeenko Andriy V Kotko James Verdal Anatoliy O Pinchuk |
| Institution: | 1. Physics Department, National Taras Shevchenko Kyiv University, 2/1 Akademik Glushkov prosp., 03127, Kiev, Ukraine 2. Laboratory of Technical Ceramics and Silicates, Gomel State Technical University, 48 October prosp., 246746, Gomel, Belarus 3. I.M. Frantsevich Institute for Problems of Materials Science, 3 Krzhizhanovsky str., 03680, Kiev, Ukraine 4. Department of Physics and Energy Sciences, University of Colorado at Colorado Springs, 1420 Austin Bluffs Pkwy, Colorado Springs, CO, 80933, USA |
| Abstract: | The surface plasmon energy in spherical silver nanoparticles embedded in silica host matrix depends on the size and temperature of the nanoparticles. The dependences of the surface plasmon energy were studied for silver nanoparticles in the size range 11?C30?nm and in the temperature interval 293?C650?K. As the size of the nanoparticles decreases or the temperature increases, the surface plasmon resonance shifts to red. When the size of the nanoparticles decreases, the scattering rate of the conduction electrons increases, which results in the nonlinear red shift of the surface plasmon resonance. The red shift with temperature is linear for larger nanoparticles and becomes nonlinear for smaller ones. As the temperature of the nanoparticles increases, the volume thermal expansion of the nanoparticles leads to the red shift of the surface plasmon resonance. The thermal volume expansion coefficient depends on the size and temperature. It increases with a decrease of the nanoparticle size and an increase of the temperature. |
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