纳米金复合炸药的设计及其近红外光吸收性质研究  

Study on the design of nanogold composite explosives and its near-infrared light absorption properties

作　　者：王智 彭亚晶[1] 赵雨新 宾耀铭 WANG Zhi;ZHAO Yuxin;BIN Yaoming;PENG Yajing(College of Physical Science and Technology,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学物理科学与技术学院,辽宁锦州121013

出　　处：《光散射学报》2022年第3期203-208,共6页The Journal of Light Scattering

基　　金：辽宁省普通高等学校校际合作项目(XJXM2020005);辽宁省大学生创新创业项目(S202110167020);中国工程物理研究院化工材料研究所横向项目。

摘　　要：金纳米粒子具有较大光吸收截面和光谱选择性,在激光点火含能材料中具有极大的应用潜力。本文根据目前实验中所制备的纳米金属复合炸药的结构和尺寸,构建了三种复合炸药的光吸收模型,分别为Au核RDX壳球形纳米粒子,Au-RDX-Au-RDX均匀相间的球形纳米粒子,以及RDX核Au壳的纳米粒子。利用离散偶极近似方法(DDA)对纳米金复合炸药的近红外吸收光谱进行了分析,并考虑了多种模型核壳尺寸及周围环境介质对光吸收性质的影响。获得了近红外光辐照下,纳米复合结构的最佳结构尺寸参数。结果表明,当制备成纳米级Au核RDX壳球形粒子时,其对近红外光(800 nm)波长具有较高的光吸收,相应的核壳尺寸约为60 nm和20 nm左右,且在水中的吸收要比在空气中的吸收强。Gold nanoparticles have great application potential in laser ignition due to their large light absorption cross section and spectral selectivity.Based on the structure and size of nanometallic composite explosives prepared in the present experiment,three types of the optical absorption models for composite explosives are constructed.They are respectively Au-core RDX-shell spherical nanoparticles,Au-RDX-Au-RDX uniform alternate core-shell spherical nanoparticles,and the RDX-core Au-shell nanoparticles.The near-infrared light absorption spectra of nanogold composite explosives are analyzed using the discrete dipole approximation method(DDA),and the effects of core shell sizes and surrounding ambient media on near-infrared laser absorption properties are considered for various models.The optimal structure parameters of the nanocomposite structure under near-infrared laser irradiation are obtained.The results show that when being prepared into a nano-scale Au core RDX shell spherical particle,it has a high light absorption for the near-infrared laser(800 nm)wavelength,the corresponding core shell size is about respectively 60 nm and 20 nm,and the absorption intensity in water is stronger than that in the air.

关 键 词：金纳米粒子 近红外激光点火 核壳尺寸 吸收光谱 

分 类 号：O433[机械工程—光学工程]