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【答案】应助回帖
greatsupercat(金币+10, 翻译EPI+1): 修改的非常好，让过觉得领金币使用更有意义了，非常感谢。 2011-08-19 16:01:41
In our work, we describled the sensing behavior of silver nanoprisms and nanospheres of comparable size or shape at room temperature by using UV-vis spectroscopy. The sensing mechenisms were analyzed by transmission electron micropscopy and electrochemistry. The study on the two kinds of nanomaterial indicated that they can be used as fast and efficient sensors for Hg2+ without adding any masking agents. There was a linear relationship with Hg2+ within the range of 10 ppb to 3 ppm for the quenching reaction at 428nm, with a theoretical detection limit of 3 ppb. The calibration curve of the silver nanoprisms showed a linear relationship held for the value of the absorption at 490nm devided by that at 758nm between 10ppb and 1ppm, with a theoretical detection limit of 20 ppb. The silver nanoprisms showed greater blue shift than the silver nanospheres and better selectivity for Hg2+. Then we investigated the bahavior of the silver nanoprism sensor and the nanosphere sensor respectively and found that they showed better sensing capacity at higher wavelengths. The electrochemical analysis of silver nanospheres and nanoprisms was carried to ascertain the change of the silver materials before and after reacting with Hg. It showed the original silver nanospheres showed greater oxidation ability than the nanoprisms, of which we assumed the greater ability might be responsible for the better selectivity. After sensing, the oxidation peak for both the silver nanospheres and the nanoprisms moved to a more positive potential because of the formation of amalgam. Finally, the silver nanoprisms proved to be the more promising sensor for the analysis of Hg2+ in contaminated waters.
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