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[email protected]2 Core–Shell Architecture: Role of the Core Material
Chemistry of Materials ( IF 8.6 ) Pub Date : 2018-06-18 00:00:00 , DOI: 10.1021/acs.chemmater.8b01333
Jennifer G. DiStefano , Yuan Li , Hee Joon Jung , Shiqiang Hao , Akshay A. Murthy , Xiaomi Zhang , Chris Wolverton , Vinayak P. Dravid

[email protected] architectures provide a rich platform for designing new geometries composed of various functional nanomaterials. Recent work has shown that [email protected]2 [email protected] structures exhibit strong light–matter interactions and promising optoelectronic device performance. However, the role of the core on [email protected]2 growth dynamics is not well understood, leaving the question of if this unusual structure is extendable to other materials systems unanswered. Herein, we present unambiguous evidence of MoS2 encapsulation of new crystalline and even noncrystalline core materials, including Ag and silica. High-resolution transmission electron microscopy shows intimate contact between each core material and their highly crystalline, conformal MoS2 shells. We propose a generalized growth mechanism for these structures, which is supported by density functional theory energy calculations and implies wider applicability of transition metal dichalcogenide encapsulation to other functional nanoparticles. Further, we demonstrate that altering the core material is a useful methodology to achieve distinct optical responses, as reflected in the photoluminescence measurements and corroborated by discrete dipole approximation calculations. By exploring the role of the core material on synthesis and properties in this architectural platform, we introduce a multiplexed [email protected]2 paradigm with numerous viable avenues for future structural and property investigation.

中文翻译:

[受电子邮件保护] 2核心-外壳体系结构:核心材料的作用

受电子邮件保护的体系结构为设计由各种功能纳米材料组成的新几何提供了一个丰富的平台。最近的工作表明,[受电子邮件保护的] 2 [受电子邮件保护的]结构表现出强烈的光-物质相互作用,并具有光电子器件的良好性能。但是,人们对[电子邮件保护的] 2增长动态中核心的作用还没有很好地理解,这使这个不寻常的结构是否可以扩展到其他材料系统的问题仍然没有得到解决。在这里,我们提供MoS 2的明确证据封装新的晶体甚至非晶核材料,包括银和二氧化硅。高分辨率透射电子显微镜显示每种核心材料与其高度结晶的共形MoS 2紧密接触贝壳。我们为这些结构提出了一种通用的生长机理,这得到密度泛函理论能量计算的支持,并暗示过渡金属二卤化硫包封对其他功能纳米粒子的更广泛的适用性。此外,我们证明了改变芯材是实现独特的光学响应的​​有用方法,这在光致发光测量中得到了反映,并得到了离散偶极近似计算的证实。通过探索核心材料在此体系结构平台中合成和特性上的作用,我们介绍了具有许多可行途径的多路[电子邮件保护] 2范式,用于将来的结构和特性研究。
更新日期:2018-06-18
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