Gold Nanostar Spatial Distribution Impacts the Surface-Enhanced Raman Scattering Detection of Uranyl on Amidoximated Polymers.
Gold Nanostar Spatial Distribution Impacts the Surface-Enhanced Raman Scattering Detection of Uranyl on Amidoximated Polymers.
复制标题
金纳米星空间分布对酰胺肟聚合物表面增强拉曼散射检测铀酰的影响。
DOI：
10.1021/acs.langmuir.1c00132
复制
发表时间：
2021-04-27
期刊：
影响因子：
--
通讯作者：
Haes AJ
中科院分区：
文献类型：
--
作者：
Phan HT;Vinson C;Haes AJ
羧化金纳米星分布在酰胺肟化聚丙烯腈（AO PAN）静电纺丝聚合物膜上的等离子体性质与配位铀（VI）氧化物（铀酰）物种的表面增强拉曼散射（Sers）强度成比例。这种两步等离子体传感器首先使用官能化聚合物从溶液中分离铀酰，然后随后沉积羧基化金纳米星用于Sers。空间分辨的局域表面等离子体共振（LSPR）和Sers促进相关的纳米星光密度和铀酰定量。为了减少采样偏差，金纳米星以倒置滴涂几何形状沉积，并在聚合物基底上形成的所得纳米颗粒咖啡环内进行测量。这种方法自然地保留了金纳米星的等离子体特性，同时减少了纳米颗粒聚集体在有源传感区域中的沉积，从而最大限度地提高了Sers测量的准确性和精度。取得了若干进展。首先，LSPR光谱的二阶导数分析通过减少由聚合物和金材料引起的背景变化来促进跨传感器衬底的大区域的局部纳米星密度的量化。其次，局部nanostar密度范围从140-200 pM·cm的结果表明，在铀酰信号是独立的nanostar浓度。第三，铀酰吸附到羧基化纳米星的吉布斯自由能估计为8.4±0.2 kcal/mol。最后，线性动态范围约为0.3至3.4 μg U/mg聚合物。因此，分布的金纳米星的等离子体活性的均匀性和在复合纳米材料传感器接口上采用空间分辨光谱测量促进了铀酰的定量检测，同时还减少了对用户专业知识和所选采样区域的依赖。这些重要进展对于开发用户友好的基于SERS的铀酰传感器至关重要。
The plasmonic properties of carboxylated gold nanostars distributed on amidoximated polyacrylonitrile (AO PAN) electrospun polymer films scale with surface-enhanced Raman scattering (SERS) intensities for coordinated uranium (VI) oxide (uranyl) species. This two-step plasmonic sensor first isolates uranyl from solution using functionalized polymers, then carboxylated gold nanostars are subsequently deposited for SERS. Spatially resolved localized surface plasmon resonance (LSPR) and SERS facilitate correlated nanostar optical density and uranyl quantification. To reduce sampling bias, gold nanostars are deposited in an inverted drop coating geometry and measurements are conducted inside resulting nanoparticle coffee rings that form on the polymer substrates. This approach naturally preserves the plasmonic properties of gold nanostars while reducing the deposition of nanoparticle aggregates in active sensing regions thereby maximizing both the accuracy and precision of SERS measurements. Several advances are made. First, second derivative analysis of LSPR spectra facilitates the quantification of local nanostar density across large regions of the sensor substrate by reducing background variations caused by the polymeric and gold materials. Second, local nanostar densities ranging from 140-200 pM·cm are shown to result in uranyl signals that are independent of nanostar concentration. Third, a Gibbs free energy of uranyl adsorption to carboxylated nanostars is estimated at 8.4±0.2 kcal/mol. Finally, a linear dynamic range of ~0.3 to 3.4 μg U/mg polymer is demonstrated. Signals vary by 10% or less. As such, the uniformity of plasmonic activity of distributed gold nanostars and the employment of spatially resolved spectroscopic measurements on the composite nanomaterial sensor interface facilitates the quantitative detection of uranyl while also reducing dependence on user expertise and selected sampling region. These important advances are critical for the development of a user-friendly SERS-based sensor for uranyl.
登录
查看更多内容
影响因子：
3.7
作者：
de Puig, Helena;Tam, Justina O.;Yen, Chun-Wan;Gehrke, Lee;Hamad-Schifferli, Kimberly
通讯作者：
Hamad-Schifferli, Kimberly
影响因子：
10.8
作者：
Hao, Feng;Nehl, Colleen L.;Nordlander, Peter
通讯作者：
Nordlander, Peter
DOI：
10.1039/c9ew00834a
发表时间：
2020-03-01
期刊：
Environmental science : water research & technology
影响因子：
--
作者：
Johns A;Qian J;Carolan ME;Shaikh N;Peroutka A;Seeger A;Cerrato JM;Forbes TZ;Cwiertny DM
通讯作者：
Cwiertny DM
影响因子：
3.8
作者：
GAL, M;GOGGIN, PL;MINK, J
通讯作者：
MINK, J
DOI：
10.1111/j.1432-1033.1978.tb12622.x
发表时间：
1978-01-01
期刊：
EUROPEAN JOURNAL OF BIOCHEMISTRY
影响因子：
--
作者：
BALESTRIERI, C;COLONNA, G;SERVILLO, L
通讯作者：
SERVILLO, L