Doping Controls Plasmonics, Electrical Conductivity, and Carrier-Mediated Magnetic Coupling in Fe and Sn Codoped In2O3 Nanocrystals: Local Structure Is the Key
Doping Controls Plasmonics, Electrical Conductivity, and Carrier-Mediated Magnetic Coupling in Fe and Sn Codoped In2O3 Nanocrystals: Local Structure Is the Key
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DOI：
10.1021/cm5040936
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发表时间：
2015-01
影响因子：
8.6
通讯作者：
G. S. Shanker;Bharat Tandon;T. Shibata;S. Chattopadhyay;Angshuman Nag
中科院分区：
文献类型：
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作者：
G. S. Shanker;Bharat Tandon;T. Shibata;S. Chattopadhyay;Angshuman Nag
多功能Fe-Sn共掺杂In 2 O3胶体纳米晶同时表现出局域表面等离子体共振带，高电导率，和电荷介导的磁耦合已经开发。Sn和Fe掺杂剂离子之间的相互作用已被发现是控制所有这些性能的关键。Sn掺杂使Sn 4+和间隙O2-之间的活性络合物还原后，在胶体纳米晶体中缓慢释放自由电子。出乎意料的是，Fe共掺杂降低了自由电子浓度。我们的X射线吸收精细结构谱（XAFS）的结果表明，Fe 3+和Sn 4+取代的In 3+在所有的Fe掺杂的In 2 O3纳米晶体和Sn掺杂的In 2 O3纳米晶体的晶格。有趣的是，对于Fe-Sn共掺杂的NC，较小部分的Fe 3+通过消耗由Sn掺杂产生的自由电子而被还原为Fe 2+。因此，Fe掺杂可以操纵Fe-Sn共掺杂In 2 O3纳米晶体中的自由电子浓度，从而控制等离子体激元带和电导率。自由电子，在…
Multifunctional Fe–Sn codoped In2O3 colloidal nanocrystals simultaneously exhibiting localized surface plasmon resonance band, high electrical conductivity, and charge mediated magnetic coupling have been developed. Interactions between Sn and Fe dopant ions have been found critical to control all these properties. Sn doping slowly releases free electrons in the colloidal nanocrystals, after reduction of active complex between Sn4+ and interstitial O2–. Unexpectedly, Fe codoping reduces the free electron concentration. Our X-ray absorption fine structure spectroscopy (XAFS) results show that Fe3+ and Sn4+ substitutes In3+ in the In2O3 lattice for all Fe-doped In2O3 NCs and Sn-doped In2O3 NCs. Interestingly, for Fe–Sn codoped NCs, a smaller fraction of Fe3+ gets reduced to Fe2+ by consuming free electrons produced by Sn doping. Therefore, Fe doping can manipulate free electron concentration in Fe–Sn codoped In2O3 nanocrystals, controlling both plasmonic band and electrical conductivity. Free electrons, on ...