研究目的
Investigating the effects of high pressure on the localized surface plasmon resonance (LSPR) of gold nanospheres dispersed in methanol-ethanol mixtures to determine the solvent refractive index and density across a wide pressure range.
研究成果
The study demonstrates that plasmonic properties of AuNSs can be used to sense changes in the surrounding medium under high pressure, enabling the determination of solvent refractive index and density across a wide pressure range. The LSPR behavior transitions from redshift to blueshift as pressure increases, reflecting changes in the relative compressibility of the solvent and gold. The method provides a direct measurement of refractive index without prior knowledge of solvent mass density or specific volume.
研究不足
The study is limited by the assumption of spherical and non-aggregated AuNSs over the 0-60 GPa range. The non-hydrostatic regime above 10 GPa may introduce anisotropic stress components not accounted for in the model.
1：Experimental Design and Method Selection:
The study employed gold nanospheres (AuNSs) dispersed in a methanol-ethanol (4:1) mixture to measure LSPR shifts under high pressure. The methodology was based on Gans’ model to correlate LSPR shifts with changes in solvent refractive index and AuNS volume.
2：Sample Selection and Data Sources:
Single-crystalline AuNSs with an average diameter of
3：9 nm were synthesized and dispersed in MeOH-EtOH (
1). High-pressure experiments were conducted using a diamond anvil cell (DAC) with ruby microspheres as pressure probes.
4：1). High-pressure experiments were conducted using a diamond anvil cell (DAC) with ruby microspheres as pressure probes. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Bo?hler-Almax diamond anvil cell, a home-built fiber-optic-based microscope, and spectrometers (Ocean Optics USB 2000 and NIRQUEST 512). Materials included gold nanospheres, methanol-ethanol mixture, and PEG-SH for ligand exchange.
5：2). Materials included gold nanospheres, methanol-ethanol mixture, and PEG-SH for ligand exchange. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Pressure was applied up to 60 GPa, and LSPR shifts were measured. The pressure was determined using ruby R-line emission. Optical absorption spectra were collected to monitor LSPR shifts.
6：Data Analysis Methods:
Data were analyzed using Gans’ model to decouple the effects of solvent refractive index changes and AuNS electron density changes on LSPR shifts.
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