Nanotechnology PAPER Gigahertz acoustic vibrations of Ga-doped ZnO nanoparticle array To cite this article: Dickson Mwenda Kinyua et al 2019 Nanotechnology 30 305201 View the article online for updates and enhancements. This content was downloaded from IP address 115.156.157.9 on 05/05/2019 at 03:19