A high-yield, one-step synthesis of surfactant-free gold nanostars and numerical study for single-molecule SERS application
A high-yield, one-step synthesis of surfactant-free gold nanostars and numerical study for single-molecule SERS application
复制标题
DOI：
10.1007/s11051-016-3557-0
复制
发表时间：
2016-08-19
影响因子：
2.5
通讯作者：
Hussian, S.
中科院分区：
文献类型：
--
作者：
Chatterjee, S.;Ringane, A. B.;Hussian, S.
我们报道了一种新的无表面活性剂的湿化学方法，一步高效地合成了星形金纳米结构。与现有的报道相比，这些纳米星被发现具有更长的、更锋利的尖刺，均匀地固定在球形核心的表面，至少允许一些热点，而不考虑入射光的偏振。芯半径和峰长的平均实验值分别为88.5 nm和72 nm。利用这些数值模拟得到了局域电场增强（eta）和局域表面等离子体共振（LSPR）谱。此外，发现单分子表面增强拉曼散射（SERS）增强因子随激发波长的不同在10(10)~ 10（13）之间变化。我们的理论计算表明，这些纳米结构可以用来制造高效的基于sers的生物传感器，用于实时检测单分子和预测单分子的结构信息。
We report a high-yield synthesis of star-shaped gold nanostructures in one step, using a new surfactant-free wet chemistry method. Compared to the existing reports, these nanostars were found to have longer and sharper spikes anchored uniformly on the surface of the spherical core, allowing at least a few hot spots irrespective of the incident light polarization. The average experimental values of core radius and spike length were found to be 88.5 and 72 nm, respectively. Using these values in numerical simulations, the local electric field enhancement (eta) and localized surface plasmon resonance (LSPR) spectrum were obtained. Moreover, the single-molecule surface-enhanced Raman scattering (SERS) enhancement factor was found to vary from 10(10) to 10(13) depending on the excitation wavelengths. Our theoretical calculations suggest that these nanostructures can be used to fabricate efficient SERS-based biosensors for the detection of single molecules in real time and for predicting structural information of single molecules.