Photothermal Convection Lithography for Rapid and Direct Assembly of Colloidal Plasmonic Nanoparticles on Generic Substrates
| Autor: | Taewook Kang, Wooju Lee, Chang Min Jin, Dongchoul Kim, Inhee Choi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Plasmonic nanoparticles
Materials science digestive oral and skin physiology Optical force Nanoparticle Nanotechnology 02 engineering and technology General Chemistry Substrate (electronics) Photothermal therapy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Biomaterials Light intensity Colloidal gold General Materials Science 0210 nano-technology Lithography Biotechnology |
| Zdroj: | Small (Weinheim an der Bergstrasse, Germany). 14(45) |
| ISSN: | 1613-6829 |
| Popis: | Controlled assembly of colloidal nanoparticles onto solid substrates generally needs to overcome their thermal diffusion in water. For this purpose, several techniques that are based on chemical bonding, capillary interactions with substrate patterning, optical force, and optofluidic heating of light-absorbing substrates are proposed. However, the direct assembly of colloidal nanoparticles on generic substrates without chemical linkers and substrate patterning still remains challenging. Here, photothermal convection lithography is proposed, which allows the rapid placement of colloidal nanoparticles onto the surface of diverse solid substrates. It is based on local photothermal heating of colloidal nanoparticles by resonant light focusing without substrate heating, which induces convective flow. The convective flow, then, forces the colloidal nanoparticles to assemble at the illumination point of light. The size of the assembly is increased by either increasing the light intensity or illumination time. It is shown that three types of colloidal gold nanoparticles with different shapes (rod, star, and sphere) can be uniformly assembled by the proposed method. Each assembly with a diameter of tens of micrometers can be completed within a minute and its patterned arrays can also be achieved rapidly. |
| Databáze: | OpenAIRE |
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