Sader John E, Pepperell Christopher J, Dunstan Dave E
Department of Mathematics and Statistics, University of Melbourne, Victoria, 3010, Australia.
ACS Nano. 2008 Feb;2(2):334-40. doi: 10.1021/nn700304b.
Knowledge of the optical properties and shape of nanoparticles is central to many technological applications including the fabrication of advanced materials and the characterization and formation of ordered films for optoelectronic devices. Measurement of such properties typically involves the independent use of advanced instrumentation such as electron and near field optical microscopy. We propose a simple experimental technique for extracting the optical and geometric properties of dilute suspensions of nanoparticles in situ. A theoretical formalism is developed to determine both the dichroic ratio and aspect ratio from a single measurement of the change in extinction of an incident light beam. The validity of this method is demonstrated for hematite nanorods, for which good agreement with independent measurements is found.
纳米颗粒的光学性质和形状的知识对于许多技术应用至关重要，包括先进材料的制造以及光电器件有序薄膜的表征和形成。此类性质的测量通常涉及独立使用先进仪器，如电子显微镜和近场光学显微镜。我们提出了一种简单的实验技术，用于原位提取纳米颗粒稀悬浮液的光学和几何性质。我们开发了一种理论形式，通过单次测量入射光束消光的变化来确定二向色比和纵横比。对于赤铁矿纳米棒，该方法的有效性得到了证明，与独立测量结果吻合良好。
