Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Gold colloidal nanoparticle electrodeposition on a silicon surface in a uniform electric field | Buttard et al. Nanoscale Research Letters 2011 6 580 http content 6 1 580 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Gold colloidal nanoparticle electrodeposition on a silicon surface in a uniform electric field D Buttard1 2 F Oelher 1 and T David1 Abstract The electrodeposition of gold colloidal nanoparticles on a silicon wafer in a uniform electric field is investigated using scanning electron microscopy and homemade electrochemical cells. Dense and uniform distributions of particles are obtained with no aggregation. The evolution of surface particle density is analyzed in relation to several parameters applied voltage electric field exchanged charge. Electrical chemical and electrohydrodynamical parameters are taken into account in describing the electromigration process. 1. Introduction The emerging fields of nanoscience and nanoengineering are helping us to better understand and control the fundamental building blocks in the physics of materials 1 2 . The manipulation of nano-objects is also essential and requires expertise in several domains mechanics electrochemistry optics. 3-5 . The traditional top-down approach is by far the most widespread within the microelectronics industry but it relies on a complex lithography technique that results in very high production costs. Alternative approaches are therefore being investigated with a view to achieving a spontaneous self-assembly of nanocomponents. Among these approaches the so-called bottom-up method is attracting increasing attention. Based on this method the self-organization of gold nanoparticles on a planar surface is providing new solutions for electrical or catalytic systems 6 7 . However the deposition of particles on a substrate 8 9 must conform to several criteria such as irreversibility of the deposition process 10 stability and high density. Deposition of gold colloidal nanoparticles can be achieved with different methods. For instance the
