研究目的
To prepare AuNPs in a CsCl aqueous solution using the solution‐plasma method, measure the change in particle diameter over time, and characterize the surface chemical states of the AuNPs at their equilibrium size at different depths beneath the surface.
研究成果
AuNPs grow via Ostwald ripening from 2.1-2.2 nm to 13 nm over 36 days, with Cs and Cl strongly interacting with Au at depths up to 2.5 nm, suggesting cyclic adsorption and bonding processes. This method could potentially remove radioactive Cs from contaminated water, but alternative metals may be needed due to cost.
研究不足
The study is limited by radiation damage during SR‐XPS measurements, which broadens spectra and may affect bond identification; also, the cost of gold may hinder practical applications for Cs removal.
1：Experimental Design and Method Selection:
The study uses the solution‐plasma method to generate AuNPs in a CsCl aqueous solution, with characterization via TEM and SR‐XPS to observe particle growth and surface chemistry.
2：Sample Selection and Data Sources:
AuNPs are prepared in a 5 mM CsCl aqueous solution, with samples taken at 1 hour, 15 hours, and 36 days for analysis.
3：List of Experimental Equipment and Materials:
Au rods (
4：95%, 0-mm diameter, Nilaco), insulating tube (SSA-S, outer diameter:
2 mm, inner diameter: 1 mm, Nikkato), pulsed AC power supply (
5：4 kV, 20 kHz, Kurita), TEM (H‐7600, Hitachi, accelerating voltage 100 kV), SR‐XPS at beam lines BL23SU in SPring‐8 and BL6N1 in AichiSR with incident X-ray energies of 0 eV and 0 eV. Experimental Procedures and Operational Workflow:
Au rods are placed in a CsCl solution with a gap, plasma is generated for 10 minutes to produce AuNPs, samples are kept for specified times, TEM observations are performed, AuNPs are rinsed and dried for SR‐XPS measurements.
6：Data Analysis Methods:
Particle diameters are measured from TEM images, XPS spectra are fitted to identify chemical bonds, with calibration based on Au 4f7/2 peak.
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