DC electric field induced phase array self-assembly of Au nanoparticles
In this work we report the discovery of phase array self-assembly, a new way to spontaneously make periodic arrangements of metal nanoparticles. An initially random arrangement of gold (Au) or silver (Ag) nanoparticles on SiO2/Si substrates was irradiated with linearly polarized (P) laser light in t...
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Veröffentlicht in: | Nanotechnology 2014-11, Vol.25 (46), p.465301-465301 |
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creator | Yadavali, S Sachan, R Dyck, O Kalyanaraman, R |
description | In this work we report the discovery of phase array self-assembly, a new way to spontaneously make periodic arrangements of metal nanoparticles. An initially random arrangement of gold (Au) or silver (Ag) nanoparticles on SiO2/Si substrates was irradiated with linearly polarized (P) laser light in the presence of a dc electric (E) field applied to the insulating substrate. For E fields parallel to the laser polarization ( ), the resulting periodic ordering was single-crystal like with extremely low defect density and covered large macroscopic areas. The E field appears to be modifying the phase between radiation scattered by the individual nanoparticles thus leading to enhanced interference effects. While phase array behavior is widely known in antenna technology, this is the first evidence that it can also aid in nanoscale self-assembly. These results provide a simple way to produce periodic metal nanoparticles over large areas. |
doi_str_mv | 10.1088/0957-4484/25/46/465301 |
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An initially random arrangement of gold (Au) or silver (Ag) nanoparticles on SiO2/Si substrates was irradiated with linearly polarized (P) laser light in the presence of a dc electric (E) field applied to the insulating substrate. For E fields parallel to the laser polarization ( ), the resulting periodic ordering was single-crystal like with extremely low defect density and covered large macroscopic areas. The E field appears to be modifying the phase between radiation scattered by the individual nanoparticles thus leading to enhanced interference effects. While phase array behavior is widely known in antenna technology, this is the first evidence that it can also aid in nanoscale self-assembly. 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subjects | Arrays Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Direct current electric field Equations of state, phase equilibria, and phase transitions Exact sciences and technology Gold interference Lasers Materials science Methods of nanofabrication Nanocrystalline materials Nanoparticles Nanoscale materials and structures: fabrication and characterization phase array Physics pulsed laser Radiation effects on specific materials Self assembly Silicon substrates Silver Specific phase transitions Structural transitions in nanoscale materials Structure of solids and liquids crystallography |
title | DC electric field induced phase array self-assembly of Au nanoparticles |
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