Sizing gold nanoparticles using graphite furnace atomic absorption spectrometry
Sizing gold nanoparticles using graphite furnace atomic absorption spectrometry
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DOI：
10.1039/c7ja00019g
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发表时间：
2017-04-01
影响因子：
3.4
通讯作者：
Tarren, H.
中科院分区：
文献类型：
--
作者：
Leopold, K.;Brandt, A.;Tarren, H.
纳米颗粒（NP）在科学技术中的应用是一个广泛且快速发展的领域。因此，需要可靠且简单的分析方法来快速表征各个领域中纳米颗粒的尺寸和浓度。最近，我们报告了一种新的评估策略，用于从石墨炉原子吸收光谱法（GFAAS）获得的数据来区分固体样品中的银纳米颗粒和离子。因此，我们引入了新参数“雾化延迟”(t(ad))和“雾化速率”(k(at))。在本研究中，我们应用这些参数来研究金纳米颗粒 (AuNP) 的水悬浮液和 Au(III) 溶液。获得的 kat 和 t(ad) 值结果显示，在 2 至 100 nm 的粒径范围内，这两个参数具有可重复的尺寸相关性。因此，这些相关性可用于尺寸校准并允许单分散水悬浮液中 AuNP 的尺寸测定。此外，在 1 至 50 μg L-1 的浓度范围内检查了 20 nm 尺寸的 AuNP 的吸光度、t(ad) 和 k(at)，表明 tad 是最稳健的参数。最后，研究了 3 至 4 种不同尺寸的 AuNP 的多峰混合物。在这里，对所获得的和峰进行反卷积可以在确定 AuNP 尺寸分布时获得令人满意的精度。因此，所提出的方法对于轻松快速地测量多分散 AuNP 悬浮液的尺寸分布具有巨大的潜力。
The application of nanoparticles (NPs) in science and technology is a wide and fast growing field. Therefore, reliable and straightforward analytical methods are required to enable fast characterization of the size and concentration of NPs in various fields. Recently, we have reported a novel evaluation strategy for data obtained from graphite furnace atomic absorption spectrometry (GFAAS) in order to distinguish silver nanoparticles and ions in solid samples. Thereby, we introduced new parameters "atomization delay" (t(ad)) and "atomization rate" (k(at)). In the present study, we applied these parameters for the investigation of aqueous suspensions of gold nanoparticles (AuNPs) and solutions of Au(III). The obtained results for kat and t(ad) values show reproducible size correlations for both parameters in a particle size range from 2 to 100 nm. Accordingly, these correlations can be used for size calibration and allow size determination of AuNPs in monodisperse aqueous suspensions. Furthermore, absorbance, t(ad) and k(at) of 20 nm-sized AuNPs were examined over a concentration range from 1 to 50 mu g L-1 revealing that tad is the most robust parameter. Finally, multimodal mixtures of 3 to 4 different sizes of AuNPs were studied. Here, deconvolution of the obtained sum peaks led to agreeable accuracy in the determination of AuNP size distribution. Hence, the proposed method has great potential for easy and fast measurement of size distribution of polydisperse AuNP suspensions.