Optically Induced Structural Instability in Gold–Silica Nanostructures: A Case Study
| Autor: | Sivaramapanicker Sreejith, Srikanth Pedireddy, Rijil Thomas, Soh Cheong Boon, Hrishikesh Joshi, Yanli Zhao, Mihaiela C. Stuparu |
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| Rok vydání: | 2016 |
| Předmět: |
Plasmonic nanoparticles
Materials science Nanostructure Nanoparticle Nanotechnology 02 engineering and technology engineering.material Photothermal therapy 021001 nanoscience & nanotechnology 01 natural sciences Instability Surfaces Coatings and Films Electronic Optical and Magnetic Materials 010309 optics General Energy Coating Colloidal gold 0103 physical sciences engineering Physical and Theoretical Chemistry 0210 nano-technology Excitation |
| Zdroj: | The Journal of Physical Chemistry C. 120:11230-11236 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b01662 |
| Popis: | Optical excitation of plasmonic nanoparticles that generate heat or induce photoacoustic signals is gathering immense attention in biomedical applications such as imaging, photothermal therapy, and drug delivery. Generally, these nanoparticles are encompassed by a silica coating that enhances their overall activity and that imparts stability. Intuitively, only an extreme high pressure and temperature can lead to the morphological rupture of these heterogeneous composites; however, herein, we report a study which shows that these drastic structural defects can also be mimicked by simple optical pulse irradiation. This happens because of the heat and pressure waves generated in these hybrids. The structural differential expansion of constituent materials induces a thermal stress in the system which causes a structural instability and ultimately ruptures the coating. To demonstrate this phenomenon, a comprehensive theoretical and experimental study has been conducted on silica-coated gold nanoparticles, with... |
| Databáze: | OpenAIRE |
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