单纳米颗粒的可及双纳米孔拉曼镊子分析

Accessible Double Nanohole Raman Tweezer Analysis of Single Nanoparticles.

作者信息

Khosravi Behnam, Gordon Reuven

机构信息

Department of Electrical and Computer Engineering, University of Victoria, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada.

Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada.

出版信息

J Phys Chem C Nanomater Interfaces. 2024 Aug 27;128(36):15048-15053. doi: 10.1021/acs.jpcc.4c03536. eCollection 2024 Sep 12.

Abstract

Raman spectroscopy allows for material characterization of nanoparticles; however, probing individual nanoparticles requires an efficient way of isolating and enhancing the signal. Past works have used optical trapping with nanoapertures in metal films to measure the Raman spectra of individual nanoparticles; however, those works required custom laser tweezer systems that provided a transmission signal to verify trapping events as well as costly top-down nanofabrication. Here, we trapped Titania nanoparticles in a commercial Raman system using double nanoholes (DNH) and measured their spectra while trapped. The microscope camera allowed for measuring the trapping event in reflection mode, and a simultaneous Raman spectrum was recorded to allow for material characterization. The Raman signal was comparable to a past work that used particles a million times larger in volume without utilizing double nanoholes, and all other features were similar. The DNHs were created with a colloidal lithography technique and identified in the microscope, as confirmed by electron microscopy registration. Therefore, this approach allows a simple way of characterizing the Raman signal of individual nanoparticles while in solution by using existing commercial Raman systems.

摘要

拉曼光谱法可用于纳米颗粒的材料表征;然而,探测单个纳米颗粒需要一种有效的方法来分离和增强信号。过去的研究工作使用金属薄膜中的纳米孔径进行光学捕获来测量单个纳米颗粒的拉曼光谱;然而,这些工作需要定制的激光镊子系统来提供传输信号以验证捕获事件,以及昂贵的自上而下的纳米制造技术。在这里,我们使用双纳米孔(DNH)在商用拉曼系统中捕获二氧化钛纳米颗粒,并在捕获时测量它们的光谱。显微镜相机允许在反射模式下测量捕获事件,并记录同时的拉曼光谱以进行材料表征。拉曼信号与过去一项使用体积大一百万倍的颗粒且未使用双纳米孔的研究工作相当,并且所有其他特征都相似。双纳米孔是用胶体光刻技术制造的,并在显微镜下识别,通过电子显微镜配准得到证实。因此,这种方法允许通过使用现有的商用拉曼系统,以一种简单的方式在溶液中表征单个纳米颗粒的拉曼信号。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c29/11404487/7e93ec9e4f9e/jp4c03536_0001.jpg

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