tailieunhanh - Báo cáo hóa học: " Shape-tailoring and catalytic function of anisotropic gold nanostructures"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Shape-tailoring and catalytic function of anisotropic gold nanostructures | Premkumar et al. Nanoscale Research Letters 2011 6 547 http content 6 1 547 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Shape-tailoring and catalytic function of anisotropic gold nanostructures Thathan Premkumar1 Kyungjae Lee1 and Kurt E Geckeler1 2 Abstract We report a facile one-pot shape-selective synthesis of gold nanoparticles in high yield by the reaction of an aqueous potassium tetrachloroaurate III solution with a commercially available detergent. We prove that a commercial detergent can act as a reducing as well as stabilizing agent for the synthesis of differently shaped gold nanoparticles in an aqueous solution at an ambient condition. It is noteworthy that the gold nanoparticles with different shapes can be prepared by simply changing the reaction conditions. It is considered that a slow reduction of the gold ions along with shape-directed effects of the components of the detergent plays a vital function in the formation of the gold nanostructures. Further the as-prepared gold nanoparticles showed the catalytic activity for the reduction reaction of 4-nitrophenol in the presence of sodium borohydride at room temperature. Keywords gold nanoparticles detergent catalytic activity one-pot synthesis Background Nanosized metal particles are of great interest and important for their applications in an ample diversity of areas such as catalysis optical devices nanotechnology and biological sciences 1-4 . Among the nanoparticles of many metals gold Au nanoparticles have gained much attention because they have shown to be a technologically important material that can be potentially used in application such as catalysis 5 6 chemical sensors 7 in biological and medical areas 4 8 and for the miniaturization of electronic devices due to their unique optical and electrical properties 4 9-12 . Interestingly these characteristic properties often depend critically not only on the particle size but also on the .