Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo hóa học: " Size-Controlled Synthesis of Colloidal Gold Nanoparticles at Room Temperature Under the Influence of Glow Discharge"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Size-Controlled Synthesis of Colloidal Gold Nanoparticles at Room Temperature Under the Influence of Glow Discharge | Nanoscale Res Lett 2010 5 124-129 DOI 10.1007 S11671-009-9453-0 NANO EXPRESS Size-Controlled Synthesis of Colloidal Gold Nanoparticles at Room Temperature Under the Influence of Glow Discharge Xi Liang Zhou-jun Wang Chang-jun Liu Received 2 August 2009 Accepted 24 September 2009 Published online 10 October 2009 to the authors 2009 Abstract Highly dispersed colloidal gold Au nanoparticles were synthesized at room temperature using glow discharge plasma within only 5 min. The prepared Au colloids were characterized with UV-visible absorption spectra UV-vis X-ray photoelectron spectroscopy XPS and transmission electron microscopy TEM equipped with an energy dispersion X-ray spectrometer EDX . UV-vis XPS and EDX results confirmed that Au3 ions in HAuCl4 solution could be effectively reduced into the metallic state at room temperature with the glow discharge plasma. TEM images showed that Au nanoparticles were highly dispersed. The size of colloidal Au nanoparticles could be easily tuned in the nanometer range by adjusting the initial concentration of HAuCl4 solution. Moreover the as-synthesized Au colloids dav 3.64 nm exhibited good catalytic activity for glucose oxidation. The nucleation and growth of colloidal Au particles under the influence of the plasma was closely related with the high-energy electrons generated by glow discharge plasma. X. Liang Z. Wang C. Liu H Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University 300072 Tianjin People s Republic of China e-mail ughg_cjl@yahoo.com Present Address X. Liang Department of Chemical and Biomolecular Engineering Rice University 6100 Main Street Houston TX 77005-1892 USA Present Address Z. Wang Department of Chemistry Texas A M University College Station TX 77843-3255 USA Keywords Size Au colloids Plasma Reduction Glucose oxidation Introduction In the last decades metal nanoparticles have attracted increasing interest because of their .