Very High Laser-Damage Threshold of Polymer-derived Si(B)CN- Carbon Nanotube Composite Coatings

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• 作者：R. Bhandavat ; A. Feldman ; C. Cromer ; J. Lehman ; G. Singh
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：5
• 期：7
• 页码：2354-2359
• 全文大小：451K
• 年卷期：v.5,no.7(April 10, 2013)
• ISSN：1944-8252

文摘

We study the laser irradiance behavior and resulting structural evolution of polymer-derived silicon鈥揵oron鈥揷arbonitride (Si(B)CN) functionalized multiwall carbon nanotube (MWCNT) composite spray coatings on copper substrate. We report a damage threshold value of 15 kWcm^-2 and an optical absorbance of 0.97 after irradiation. This is an order of magnitude improvement over MWCNT (1.4 kWcm^-2, 0.76), SWCNT (0.8 kWcm^鈥?, 0.65) and carbon paint (0.1 kWcm^鈥?, 0.87) coatings previously tested at 10.6 渭m (2.5 kW CO₂ laser) exposure. Electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy suggests partial oxidation of Si(B)CN forming a stable protective SiO₂ phase upon irradiation.

Keywords:

carbon nanotubes; optical coatings; polymer-derived Si(B)CN; laser radiometry