研究目的
To measure two-dimensional size distributions of plasmonic nanorods in a single experiment using analytical ultracentrifugation equipped with a multiwavelength extinction detector.
研究成果
The study presents a powerful and accurate tool for the precise determination of the length and diameter distributions of gold nanorods in one single experiment. The methodology can be tailored for other plasmonic nanoparticles, provided that the required information of the size, shape or composition can be obtained by analyzing the extracted spectra.
研究不足
The method depends on the spectral resolution of the optical detector system and the size range of the analyzed gold nanorods. Smaller plasmonic particles can be investigated using higher rotor speeds, but the analysis of particles with optical features exceeding 1000 nm is limited by current instrumentation.
1：Experimental Design and Method Selection:
The study utilized an analytical ultracentrifuge equipped with a multiwavelength extinction detector to record the optical and sedimentation properties of gold nanorods simultaneously.
2：Sample Selection and Data Sources:
Gold nanorods stabilized with CTAB and citrate in water were used for the experiments.
3：List of Experimental Equipment and Materials:
An Optima L-90K preparative ultracentrifuge from Beckman Coulter equipped with a multiwavelength detector (MWL-AUC) was used. Titanium centerpieces with an optical path length of 12 mm as well as sapphire windows from Nanolytics were utilized.
4：Experimental Procedures and Operational Workflow:
Fast sedimentation of gold nanorods was achieved at constant speeds, allowing also to accumulate multiple lamp flashes on the spectrometer. The data were collected at a specific radial position with spectrometers covering different wavelength ranges.
5：Data Analysis Methods:
The data analysis involved a combination of sedimentation and optical data to measure the 2D length and diameter distributions of gold nanorods.
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