White-Light Spectral Interferometry for Characterizing Inhomogeneity in Solutions and Nanocolloids

IF 4.8 Q2 NANOSCIENCE & NANOTECHNOLOGY ACS Nanoscience Au Pub Date : 2022-07-18 DOI:10.1021/acsnanoscienceau.2c00014
Aparna Praturi, Stefan Schrod, Bhanu Pratap Singh and Parinda Vasa*, 
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Abstract

We demonstrate the use of white-light spectral interferometry as an effective technique involving only linear optical interactions and a partially coherent light source to measure the complex transmission response function of optical resonance and to determine the corresponding variation in the refractive index relative to a reference. We also discuss experimental arrangements to increase the accuracy and sensitivity of the technique. The superiority of the technique over single-beam absorption measurements is demonstrated by the accurate determination of the response function of the chlorophyll-a solution. The technique is then applied to chlorophyll-a solutions of varying concentrations and gold nanocolloids to characterize inhomogeneous broadening. Results on the inhomogeneity of gold nanocolloids are also supported by transmission electron micrographs, showing distributions of the size and shape of the constituent gold nanorods.

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白光光谱干涉法表征溶液和纳米胶体中的不均匀性
我们证明使用白光光谱干涉测量法作为一种有效的技术,只涉及线性光学相互作用和部分相干光源,以测量光学共振的复杂传输响应函数,并确定相对于参考的折射率的相应变化。我们还讨论了实验安排,以提高该技术的准确性和灵敏度。通过对叶绿素-a溶液响应函数的精确测定,证明了该技术比单光束吸收测量的优越性。然后将该技术应用于不同浓度的叶绿素-a溶液和金纳米胶体,以表征非均匀展宽。透射电子显微图也支持了金纳米胶体的非均匀性,显示了组成金纳米棒的大小和形状的分布。
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ACS Nanoscience Au
ACS Nanoscience Au 材料科学、纳米科学-
CiteScore
4.20
自引率
0.00%
发文量
0
期刊介绍: ACS Nanoscience Au is an open access journal that publishes original fundamental and applied research on nanoscience and nanotechnology research at the interfaces of chemistry biology medicine materials science physics and engineering.The journal publishes short letters comprehensive articles reviews and perspectives on all aspects of nanoscience and nanotechnology:synthesis assembly characterization theory modeling and simulation of nanostructures nanomaterials and nanoscale devicesdesign fabrication and applications of organic inorganic polymer hybrid and biological nanostructuresexperimental and theoretical studies of nanoscale chemical physical and biological phenomenamethods and tools for nanoscience and nanotechnologyself- and directed-assemblyzero- one- and two-dimensional materialsnanostructures and nano-engineered devices with advanced performancenanobiotechnologynanomedicine and nanotoxicologyACS Nanoscience Au also publishes original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials engineering physics bioscience and chemistry into important applications of nanomaterials.
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