研究目的
To investigate optical and photoacoustic properties of colloidal silver nanoparticles at different concentrations over time.
研究成果
Colloidal silver nanoparticles' optical and photoacoustic properties are significantly influenced by concentration and time. PA signals depend on various parameters, including excitation wavelengths, input energy, repetition rate, concentration, and temperature. The study provides insights into the stability and behavior of silver nanoparticles in solution over time.
研究不足
The study's limitations include the potential for structural disorder and displacement in nanoparticles affecting XRD results, and the aggregation of nanoparticles over time influencing PA signals.
1：Experimental Design and Method Selection:
The study involved preparing colloidal silver nanoparticles solutions at different concentrations and studying their optical and photoacoustic properties over time. Techniques included X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), UV-Visible spectrophotometry, and luminescence spectrometry.
2：Sample Selection and Data Sources:
Colloidal silver nanoparticles solutions were prepared using silver nitrate and sodium borohydride in triple distilled water. Different concentrations were systematically studied.
3：List of Experimental Equipment and Materials:
Equipment included a UV-Visible spectrophotometer (Lambda 40, Perkin Elmer, USA), Luminescence Spectrometer (LS45, Perkin Elmer, USA), TEM (JEM-2100F, JEOL, Japan), and XRD (X’Pert Pro, PANalytical, Netherlands). Materials included silver nitrate (AgNO3) and sodium borohydride (NaBH4).
4：4). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Solutions were prepared, homogenized, and then analyzed for optical and photoacoustic properties at various intervals.
5：Data Analysis Methods:
Data were analyzed to understand the effects of concentration and time on optical and photoacoustic properties, including absorption spectra, fluorescence, and PA signals.
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Transmission electron microscopy
JEM-2100F field emission electron microscope
JEOL
To study the particles size and crystallite structure of silver nanoparticles.
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X-ray Diffraction
X’Pert Pro
PANalytical
For phase analysis to understand the crystal structure of the silver nanoparticles.
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UV-Visible spectrophotometer
Lambda 40
Perkin Elmer
To obtain the absorption spectra of silver nanoparticles in the spectral range from 190 nm to 1100 nm.
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Luminescence Spectrometer
LS45
Perkin Elmer
To obtain the emission, excitation spectra, and synchronous fluorescence.
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Nd: YAG laser
LQ 129
Solar Laser System
Used in the photoacoustic configuration.
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Third harmonic generator
LG 103
Solar Laser System
Used with the laser for generating third harmonic.
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Titanium doped sapphire laser
LX 325
Solar Laser System
Used to study the relationship between photoacoustic signal and wavelength.
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