Facile Growth of High-Yield Gold Nanobipyramids Induced by Chloroplatinic Acid for High Refractive Index Sensing Properties.
Facile Growth of High-Yield Gold Nanobipyramids Induced by Chloroplatinic Acid for High Refractive Index Sensing Properties.
复制标题
氯铂酸诱导的高产金纳米双锥体的轻松生长，具有高折射率传感特性
DOI：
10.1038/srep36706
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发表时间：
2016-11-14
影响因子：
4.6
通讯作者：
Geng B
中科院分区：
文献类型：
--
作者：
Fang C;Zhao G;Xiao Y;Zhao J;Zhang Z;Geng B
Au纳米双吡喃(Nbps)由于其独特的局域表面等离子体共振性质而引起人们的极大关注。然而，目前的生长方法要么成品率低，要么工艺繁琐。因此，开发使用普通试剂直接合成高产率Au-nbps的新方法是可取的。在这里，我们首次使用氯铂酸作为关键的定形剂，用改进的种子介导法在室温下生长了Au_nBps。在种子制备过程中和生长液中都加入了H_2PtCl6。从氯铂酸中还原出来的金属铂会沉积在晶种纳米颗粒和Au纳米晶的表面，从而对Au-nBPS的形成起到关键作用。此外，还原剂、前体和表面活性剂都是廉价和常用的。此外，Au nbps提供窄的尺寸分布、两个锋利的尖端和共享的基数。因此，Au纳米棒比Au纳米棒具有更高的折射率灵敏度。与Au纳米棒样品相比，Au纳米棒样品的折射率灵敏度和较大的优值系数分别提高了63%和321%。
Au nanobipyramids (NBPs) have attracted great attention because of their unique localized surface plasmon resonance properties. However, the current growth methods always have low yield or suffer tedious process. Developing new ways to direct synthesis of high-yield Au NBPs using common agents is therefore desirable. Here, we employed chloroplatinic acid as the key shape-directing agent for the first time to grow Au NBPs using a modified seed-mediated method at room temperature. H2PtCl6was added both during the seed preparation and in growth solution. Metallic Pt, reduced from chloroplatinic acid, will deposit on the surface of the seed nanoparticles and the Au nanocrystals and thus plays a critical role for the formation of Au NBPs. Additionally, the reductant, precursor, and surfactant are all cheap and commonly used. Furthermore, the Au NBPs offer narrow size distribution, two sharp tips, and a shared basis. Au NBPs therefore show much higher refractive index sensitivities than that of the Au nanorods. The refractive index sensitivities and lager figure of merit values of Au NBPs exhibit an increase of 63% and 321% respectively compared to the corresponding values of Au nanorod sample.