核径迹-银纳米颗粒改性的CR-39材料制备及其抗红外反射性能

Preparation and Anti-infrared Property of CR-39 Modified With Nuclear Tracks and Silver Nano-particles

本工作用中国原子能科学研究院HI-13串列加速器提供的32S离子辐照CR-39样品,产生潜径迹,用紫外灯敏化后在氢氧化钠溶液中蚀刻,使潜径迹成为具有一定孔径的孔(洞)。用真空充氩气的方法在核径迹孔样品表面镀银纳米颗粒。电子扫描电镜图片显示,氩气压强在50～100Pa之间时,银纳米颗粒直径约为60～100nm,纳米颗粒形成球状团簇的大小为3μm。在红外光区(2.5～25μm)测量镀膜样品的反射率,测量结果表明,CR-39表面的核径迹与银纳米颗粒能将红外光区(8.0～25μm)的反射率降低到0.9%,与未经改性的CR-39比较,减低了82%。在5.8和7.8μm处,CR-39的本底反射率分别从9.0%和13.0%降低到了5.0%和6.8%。

CR-39 samples were irradiated with sulphur ions from HI-13 tandem accelerator to produce latent tracks at China Institute of Atomic Energy.Ultraviolet light with wavelength 360 nm was used to sensitize the bombarded CR-39 samples before chemical etching by NaOH solution.The latent tracks were then developed into pores or holes with certain diameter.Silver black was coated on the surface of etched CR-39 using evaporation in inert gas argon ambience.The SEM images indicate that the silver nano-particles are 60-100 nm in diameter at the pressure of 50-100 Pa,and the diameter of spherical clusters formed by nano-particles is 3 μm.The reflectivity indices were measured for all CR-39 samples,untreated and treated with above-mentioned procedures,within the wavelength of 2.5-25 μm.The results indicate that CR-39 modified with a combination of solid state nuclear tracks and silver black coating can decrease the reflectivity index to 0.9% for the wavelength range of 8.0-25 μm,and that is 82% reduction compared to CR-39 without modification.The blank reflectivity indices of CR-39 at wavelength of 5.8 μm and 7.8 μm are reduced from 9.0% and 13.0% to 5.0% and 6.8%,respectively.