Understanding the Collective Optical Properties of Complex Plasmonic Vesicles
Understanding the Collective Optical Properties of Complex Plasmonic Vesicles
复制标题
DOI：
10.1002/adom.201700403
复制
发表时间：
2017-10-16
影响因子：
9
通讯作者：
Qin, Zhenpeng
中科院分区：
文献类型：
--
作者：
Randrianalisoa, Jaona;Li, Xiuying;Qin, Zhenpeng
小等离子体纳米颗粒的囊泡组装体或等离子体囊泡是用于光热治疗、近红外（NIR）光响应药物释放和从体内快速清除小无机颗粒的有前景的多功能治疗诊断平台。报道了宽范围的光学性质，包括在可见光或NIR范围内的特征吸收峰或宽带吸收。目前还不清楚大量小的金纳米颗粒之间的复杂相互作用如何有助于等离子体囊泡的集体光学性质。在这项研究中，集体的等离子体激元囊泡的光学性质进行检查和四个特征制度，即孤立的纳米颗粒制度，库仑相互作用制度，黑金制度，和纳米壳制度，被揭示。小的等离子体纳米粒子需要非常接近或弱重叠以提供宽带吸收（即，黑金体系）或形成NIR等离子体激元峰。此外，较小的金纳米颗粒或较大的核尺寸导致更高的NIR峰位移和光热转换效率。预计这项研究提供了设计指南，从而对进一步设计和开发用于生物医学应用的复杂等离子体纳米结构和囊泡产生重大影响。
Vesicular assembly of small plasmonic nanoparticles, or plasmonic vesicle, is a promising multifunctional theranostic platform for photothermal therapy, near infrared (NIR) light-responsive drug release, and rapid clearance of small inorganic particles from the body. Wide ranges of optical properties are reported including characteristic absorption peak in the visible or NIR ranges, or broadband absorption. It is unclear how the complex interaction among a large number of small gold nanoparticles contribute to the collective optical property of a plasmonic vesicle. In this study, the collective optical properties of plasmonic vesicles are examined and four characteristic regimes, namely the isolated nanoparticle regime, Coulomb interaction regime, black gold regime, and nanoshell regime, are revealed. Small plasmonic nanoparticles need to be very close or weakly overlap to give a broadband absorption (i.e., black gold regime) or form a NIR plasmon peak. Furthermore, smaller gold nanoparticle or larger core size leads to higher NIR peak shift and photothermal conversion efficiency. It is anticipated that this study provides design guidelines and thus have a significant impact on further design and development of complex plasmonic nanostructures and vesicles for biomedical applications.