研究目的
Investigating the applicability of PAAO membranes for the production of ordered nanoparticle arrays and the size-dependent fractioning of polydisperse colloids.
研究成果
The study demonstrates that PAAO membranes are suitable for producing ordered nanoparticle arrays and for size-dependent fractioning of polydisperse colloids. The method allows for the creation of dense, non-touching nanoparticle arrays with potential applications in quantum computing, biomolecular labeling, and nanophotonic light sources.
研究不足
The study acknowledges the difficulty in measuring particle density quantitatively and the challenge in distinguishing individual particles from small aggregates in SEM analysis of deep pores.
1：Experimental Design and Method Selection
The study involves the use of PAAO templated deposition of commercially available FND, focusing on the balance between withdrawal speed and evaporation driven particle flux influenced by the asperities of the PAAO surface.
2：Sample Selection and Data Sources
A polydisperse suspension of irregularly shaped diamonds with a 28 nm number mean value diameter was used. PAAO membranes were produced on high purity aluminum sheets.
3：List of Experimental Equipment and Materials
SEM Hitachi S4800 for particle size and distribution analysis, 520 nm diode laser (Osram PLP520) for excitation of NV centers, microscope lens (40x, NA 0.60, Leica HCX PL Floutar), optical filters, photon multiplier (Hamamatsu H7421-40), and a 3-axis positioning stage (Thorlabs MAX341/M).
4：Experimental Procedures and Operational Workflow
The PAAO coated Al sheet was immersed in the colloid and pulled out at constant velocity. The samples were left to dry overnight in air at room temperature. Fluorescence signal was collected and analyzed.
5：Data Analysis Methods
SEM analysis for particle size and distribution, fluorescence imaging for detecting NV centers.
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