Photoacoustic Studies of Colloidal Silica Particles after MeV Ion-Induced Shape Deformation

• 作者: Juan Carlos Cheang Wong Rosalba Casta?eda-Guzmán Santiago Jesús Pérez-Ruiz Ulises Morales
• 来源期刊: 玻璃与陶瓷期刊(英文)
• 学科: 医学
• 关键词: PULSED Laser PHOTOACOUSTIC SPECTROSCOPY SILICA Particles Ion IRRADIATION
• 年，卷（期）: 2011,（2）
• 页码范围: 63-68
• 页数: 6页
• 分类号: R73

摘要

Ordered arrays of colloidal submicrometer-sized silica particles deposited onto silicon wafers were irradiated with MeV Si ions. The spherical silica particles turned into oblate particles as a result of the increase of the particle dimension perpendicular to the ion beam direction and the decrease in the parallel direction. Pulsed laser photoacoustic spectroscopy was used to study the structural changes of the silica particles after the ion-induced shape deformation. Our purpose is to correlate the mechanical vibrations generated by the pulsed laser as a function of the Si irradiation parameters: ion energy and fluence. Fast Fourier transform analysis of the photoacoustic signal was carried out in order to obtain the normal vibration modes of the system. The size, size distribution and shape of the silica particles were determined by scanning electron microscopy. Our results revealed significant structural differences between the spherical and the deformed silica particles.