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greatsupercat木虫 (正式写手)
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[求助]
求摘要翻译论色，中文是我自己写的，英文也是我自己写的，请大家帮忙修改英文部分。
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在这项工作中，我们描述了在室温下的纳米银三角片和密度相当或类似形状的纳米球的传感器行为，通过使用紫外可见光谱。传感机理进行了分析通过使用透射电子显微镜和电化学。这两种纳米材料的研究表明，他们可以作为汞的快速高效传感器，无需增加任何掩蔽剂。在428纳米传感器淬灭的反应在+10 ppb和3ppm成线性关系，理论检测限为3 PPB。跟据纳米银三角片的校准曲线可知，在490 nm处的吸收除以758 nm的吸收线性范围为10 ppb到1 ppm，理论检查限为20 ppb。银三角片的蓝移明显大于球状纳米银，并对汞有更好的选择性。然后我们对纳米银三角片和纳米球的传感器行为分别分析，研究表明在更高的波长的纳米银或三角片均有更好的传感器能力。通过电化学分析来确定银纳米材料在与汞反应的前后变化，研究表明，三角片的氧化峰小于球的氧化峰，因此纳米银三角片更容易被氧化。而与汞反应后的纳米银和三角片的氧化峰均正向移动。最后，我们通过实验证明纳米银三角片有更大的潜力作为污水分析的传感器。 In this work, we describe the sensing behavior of silver nanoprisms and nanosphere of comparable size or comparable shape, at room temperature by using UV-visible spectroscopy. The sensing mechanisms were analyzed by transmission electron microscopy and electrochemistry. These two nanomaterials showed to be fast and efficient sensors for Hg2+ without adding any masking agent. The sensor extinction response at 428 nm was in linear relationship for Hg2+ between 10 ppb to 3 ppm by silver nanospheres with a theoretical detection limit of 3 ppb. The calibration curve of the silver nanoprisms showed the extinction ratio value at 758 nm divided by 490 nm decreased linearly over the Hg2+ concentration range of 20 ppb to 1 ppm with a theoretical detection limit of 10 ppb. The silver nanoprisms showed greater blue shift than nanospheres and the better selectivity for Hg2+. Then silver nanoprisms and nanospheres of comparable absorbance had been investigated to learn the shape dependant behavior respectively, which showed better sensing capacity at higher wavelength for both of them. The electrochemistry of silver nanospheres and nanoprisms had been investigated to ascertain the silver nanomaterial surface change before and after sensing. It showed the original silver nanoprisms showed greater oxidation activity than nanospheres, by which we assumed the greater activity might be responsible for the better sensing selectivity. After sensing, the oxidation peak for both silver nanospheres and nanoprisms changed to more positive potential because of the formation of amalgam. It was possible to use this approach in applications for the analysis of Hg2+ in contaminated waters especially by nanoprisms. |
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