tailieunhanh - Báo cáo hóa học: " Synthesis of Starch-Stabilized Ag Nanoparticles and Hg2+ Recognition in Aqueous Media"

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: Synthesis of Starch-Stabilized Ag Nanoparticles and Hg2+ Recognition in Aqueous Media | Nanoscale Res Lett 2009 4 1230-1235 DOI S11671-009-9387-6 NANO EXPRESS Synthesis of Starch-Stabilized Ag Nanoparticles and Hg2 Recognition in Aqueous Media Yingju Fan Zhen Liu Le Wang Jinhua Zhan Received 29 March 2009 Accepted 1 July 2009 Published online 15 July 2009 to the authors 2009 Abstract The starch-stabilized Ag nanoparticles were successfully synthesized via a reduction approach and characterized with SPR UV Vis spectroscopy TEM and HRTEM. By utilizing the redox reaction between Ag nanoparticles and Hg2 and the resulted decrease in UV Vis signal we develop a colorimetric method for detection of Hg2 ion. A linear relationship stands between the absorbance intensity of the Ag nanoparticles and the concentration of Hg2 ion over the range from 10 ppb to 1 ppm at the absorption of 390 nm. The detection limit for Hg2 ions in homogeneous aqueous solutions is estimated to be 5 ppb. This system shows excellent selectivity for Hg2 over other metal ions including Na K Ba2 Mg2 Ca2 Fe3 and Cd2 . The results shown herein have potential implications in the development of new colorimetric sensors for easy and selective detection and monitoring of mercuric ions in aqueous solutions. Keywords Nanoparticles Recognition Mercury ion Silver Colorimetric Electronic supplementary material The online version of this article doi s11671-009-9387-6 contains supplementary material which is available to authorized users. Y. Fan Z. Liu L. Wang J. Zhan El School of Chemistry and Chemical Engineering Shandong University 250100 Jinan People s Republic of China e-mail jhzhan@ Y. Fan School of Chemistry and Chemical Engineering University of Jinan 250022 Jinan People s Republic of China Introduction Noble metal nanostructures have drawn great interests because of their unique properties. One of them is large optical field enhancements resulting in strong scattering and absorption of light 1 . Remarkable progresses have been made in diverse research fields such as