Plasmonic Nanofabrication through Optical Heating
Plasmonic Nanofabrication through Optical Heating
复制标题
DOI：
10.1021/acs.jpcc.5b11762
复制
发表时间：
2016-03-31
影响因子：
3.7
通讯作者：
Hashimoto, Shuichi
中科院分区：
文献类型：
--
作者：
Enders, Matthias;Mukai, Shinya;Hashimoto, Shuichi
在溶液中，温度梯度可以诱导溶质从热区域迁移到冷区域，反之亦然。这个过程，称为热泳，已被应用于操纵，运输和分离各种大分子和胶体，通过利用微尺度的温度梯度。在这里，我们描述了使用一个单一的金纳米粒子（金纳米粒子）作为一个有效的纳米加热源，以促进热泳。此外，在引入具有高热导率的衬底（诸如蓝宝石）时，在连续波激光照射下，可以在AuNP附近的介质中形成强的局部温度梯度。我们观察到聚乙二醇和十二烷基硫酸钠等分子被运送到AuNP并附着在其表面，在几十秒的光照下形成了金核-有机壳结构。在光谱上，由于逐渐增加的封装，渐进的红移与增强的散射强度被认为是局部表面等离子体共振带的金纳米粒子随着照明周期的增加。死后扫描电子显微镜提供了直接证据的外壳形成。我们的技术与基于纳米尺度的光加热的纳米纤维有关。
A temperature gradient can induce solutes to migrate from a hot to a cold region, and vice versa, in solution. This process, termed thermophoresis, has been applied to manipulate, transport, and separate various macromolecules and colloids by exploiting a microscale temperature gradient. Here we describe using a single gold nanoparticle (AuNP) as an efficient nanoscale heating source to promote thermophoresis. Moreover, on introducing a substrate with high thermal conductivity such as sapphire, a strong local temperature gradient can be shaped in the medium near the AuNP under continuous wave laser illumination. We observed molecules such as polyethylene glycol and sodium dodecyl sulfate being transported toward the AuNP and attaching to its surface, forming a gold core-organic shell structure within several tens of seconds of illumination. Spectroscopically, because of the gradual increasing encapsulation, progressive red shifts with enhanced scattering intensities were seen for the localized surface plasmon resonance bands of the AuNP with increasing cycles of illumination. Postmortem scanning electron microscopy provided direct evidence of shell formation. Our technique is relevant to nanofabrication based upon optical heating at the nanometer scale.