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首页> 外文期刊>Chemistry: A European journal >Seed-Mediated Growth of Silver Nanocubes in Aqueous Solution with Tunable Size and Their Conversion to Au Nanocages with Efficient Photothermal Property
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Seed-Mediated Growth of Silver Nanocubes in Aqueous Solution with Tunable Size and Their Conversion to Au Nanocages with Efficient Photothermal Property

机译：种子介导的纳米银在尺寸可调的水溶液中的生长及其转化为具有高效光热性能的金纳米笼的过程

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摘要

Two seed-mediated approaches for the growth of silver nanocubes in aqueous solution have been developed. Addition of a silver-seed solution to a mixture of cetyltrimethylammonium chloride (CTAC), silver trifluoroacetate, and ascorbic acid and heating the solution at 60 degrees C for 1.5h produces uniform Ag nanocubes with tunable sizes from 23 to 60nm by simply adjusting the volume of silver-seed solution introduced. Alternatively, the silver-seed solution can be injected into a mixture of cetyltrimethylammonium bromide (CTAB), silver nitrate, copper sulfate, and ascorbic acid and heated to 80 degrees C for 2h to generate 46nm silver nanocubes. Plate-like Ag nanocrystals exposing {111} surfaces can be synthesized by reducing Ag(NH3)(2)(+) with ascorbic acid in a CTAC solution. Relatively large Ag nanocubes were converted to cuboctahedral Au/Ag and Au nanocages and nanoframes with empty {111} faces through a galvanic replacement reaction. The nanocages showed a progressive plasmonic band red-shift with increasing Au content. The nanocages exhibited high and stable photothermal efficiency with solution temperatures quickly reaching beyond 100 degrees C when irradiated with an 808nm laser for large heat and water vapor generation.
机译：已经开发了两种种子介导的方法，用于在水溶液中生长银纳米立方体。将银种子溶液添加到十六烷基三甲基氯化铵（CTAC），三氟乙酸银和抗坏血酸的混合物中，并将溶液在60摄氏度加热1.5小时，可通过简单地调节体积来生成大小可调的Ag纳米立方体，其大小可调范围为23至60nm。引入了银种子溶液。或者，可以将银种子溶液注入十六烷基三甲基溴化铵（CTAB），硝酸银，硫酸铜和抗坏血酸的混合物中，并加热到80摄氏度持续2小时，以生成46nm的纳米银颗粒。可以通过在CTAC溶液中用抗坏血酸还原Ag（NH3）（2）（+）来合成暴露{111}表面的板状Ag纳米晶体。通过电置换反应，将相对较大的Ag纳米立方体转换为具有空{111}面的立方八面体Au / Ag和Au纳米笼和纳米框架。纳米笼显示随着金含量的增加，逐渐发生的等离激元能带红移。纳米笼展示了高而稳定的光热效率，当用808nm激光辐照产生大量热量和水蒸气时，溶液温度迅速超过100摄氏度。

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