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Enriching Silver Nanocrystals with a Second Noble Metal
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2017-07-05 00:00:00 , DOI: 10.1021/acs.accounts.7b00216 Yiren Wu 1 , Xiaojun Sun 1 , Yin Yang 2 , Jumei Li 3 , Yun Zhang 1 , Dong Qin 1
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2017-07-05 00:00:00 , DOI: 10.1021/acs.accounts.7b00216 Yiren Wu 1 , Xiaojun Sun 1 , Yin Yang 2 , Jumei Li 3 , Yun Zhang 1 , Dong Qin 1
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Noble-metal nanocrystals have received considerable interests owing to their fascinating properties and promising applications in areas including plasmonics, catalysis, sensing, imaging, and medicine. As demonstrated by ample examples, the performance of nanocrystals in these and related applications can be augmented by switching from monometallic to bimetallic systems. The inclusion of a second metal can enhance the properties and greatly expand the application landscape by bringing in new capabilities. Seeded growth offers a powerful route to bimetallic nanocrystals. This approach is built upon the concept that preformed nanocrystals with uniform, well-controlled size, shape, and structure can serve as seeds to template and direct the deposition of metal atoms. Seeded growth is, however, limited by galvanic replacement when the deposited metal is less reactive than the seed. The involvement of galvanic replacement not only makes it difficult to control the outcome of seeded growth but also causes degradation to some properties. We have successfully addressed this issue by reducing the salt precursor(s) into atoms with essentially no galvanic replacement. In the absence of self-nucleation, the atoms are preferentially deposited onto the seeds to generate bimetallic nanocrystals with controlled structures.
中文翻译：
用第二种贵金属富集银纳米晶体
贵金属纳米晶体因其引人入胜的性能以及在等离激元，催化，传感，成像和医学等领域的广泛应用而受到了广泛的关注。如大量示例所示，可以通过从单金属系统切换到双金属系统来增强纳米晶体在这些及相关应用中的性能。引入第二种金属可以通过引入新功能来增强性能并极大地扩展应用范围。种子生长为双金属纳米晶体提供了一条强有力的途径。这种方法建立在这样的概念之上，即预先形成的具有均匀，受控大小，形状和结构的纳米晶体可以充当模板和引导金属原子沉积的种子。但是，种子的增长是 当沉积的金属比种子的反应性差时，受电流置换的限制。电流置换的参与不仅使得难以控制种子生长的结果，而且导致某些特性的退化。我们已经成功地通过将盐前体还原为原子而基本没有电取代的方法成功地解决了这个问题。在没有自成核的情况下，原子优先沉积在种子上，以产生具有受控结构的双金属纳米晶体。
更新日期：2017-07-05
中文翻译：
用第二种贵金属富集银纳米晶体
贵金属纳米晶体因其引人入胜的性能以及在等离激元，催化，传感，成像和医学等领域的广泛应用而受到了广泛的关注。如大量示例所示，可以通过从单金属系统切换到双金属系统来增强纳米晶体在这些及相关应用中的性能。引入第二种金属可以通过引入新功能来增强性能并极大地扩展应用范围。种子生长为双金属纳米晶体提供了一条强有力的途径。这种方法建立在这样的概念之上，即预先形成的具有均匀，受控大小，形状和结构的纳米晶体可以充当模板和引导金属原子沉积的种子。但是，种子的增长是 当沉积的金属比种子的反应性差时，受电流置换的限制。电流置换的参与不仅使得难以控制种子生长的结果，而且导致某些特性的退化。我们已经成功地通过将盐前体还原为原子而基本没有电取代的方法成功地解决了这个问题。在没有自成核的情况下，原子优先沉积在种子上，以产生具有受控结构的双金属纳米晶体。
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