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Robust and accurate measurements of gold nanoparticle concentrations using UV-visible spectrophotometry
摘要： This paper provides an empirical formula to calculate the extinction efficiencies of gold nanoparticles over the size range 1–1000 nm in fluids with refractive indexes which extend from n = 1 to n = 1.62. The formula contains a shape factor to account for nonspherical particles and aggregates. The empirical curves are fitted to values calculated from accurate Mie and T-Matrix theory and confirm previous descriptions which are restricted to nearly spherical particles in water of diameter between 5 and 100 nm. This paper demonstrates that these previous descriptions will be in error for fluids other than water and for nonspherical particles greater than 100 nm in size. An empirical description is provided which matches calculated values to within a few percent across most of the range. The description also matches experimental data to within the standard relative error, currently 5% at best, using other methods which directly measure the particle concentration. These extinction efficiencies can be used to validate the concentration of gold nanoparticles in a wide range of situations to support the drive for reproducibility in nanoparticle research.
关键词： Mie theory,extinction efficiencies,gold nanoparticles,T-Matrix theory,UV-visible spectrophotometry
更新于2025-09-10 09:29:36
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PHYTOSYNTHESIS OF SILVER NANOPARTICLES USING E. CAMALDULENSIS LEAF EXTRACT AND THEIR CHARACTERIZATION
摘要： Herein, we report a simple green synthesis of silver nanoparticles (Ag NPs) by the reduction of aqueous silver salt solution using leaf broth of Eucalyptus camaldulensis. The profile of synthesized silver nanoparticles was evaluated by using UV-visible spectrophotometer, X-ray diffractometer, atomic force microscope, energy-dispersive X-ray spectroscope and scanning electron microscope. Surface plasmon resonance peak of silver nanoparticles appeared at 425 nm in UV-vis spectra of silver nanoparticles. XRD studies clearly confirmed the crystalline nature of the synthesized nanoparticles. The EDX analysis disclosed the arranged inorganic composition of the synthesized Ag NPs. Atomic force microscopy investigation revealed 3D surface profile of nanoparticles. From the SEM images, the silver nanoparticles were found to be more or less spherical with an average diameter range of 110-250 nanometers.
关键词： E. camaldulensis,SEM,AFM,UV-visible spectrophotometry,XRD,Ag NPs
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [Author(s) 2ND INTERNATIONAL CONFERENCE ON CHEMISTRY, CHEMICAL PROCESS AND ENGINEERING (IC3PE) - Yogyakarta, Indonesia (14 August 2018)] - Validation on analysis method for phosphorus in solid inorganic fertilizer using UV-visible spectrophotometry
摘要： Determination of performance and uncertainty parameters from P2O5 analysis in inorganic fertilizer conducted by spectrophotometric UV-Visible has been done. This method was conducted in three stages those were preparation, testing and data processing. In the preparation stage, standard solution and reagent solution was made and for the testing stage, phosphorus standard and P2O5 samples were taken from inorganic fertilizer with linearity, precision (repeatability), accuracy (% recovery), limit of detection and limit of quantitation as variable analysis. The stage of data processing, the obtained results were processed statistically and compared with the acceptance requirements set by standard method. The coefficient determination (R2), precision, and accuracy respectively were 0.9999, 0.174%, and 100.58%, meanwhile LOD and LOQ were 1.653 mg/L and 5.508 mg/L. Based on the results can be concluded that the method analysis of P2O5 using spectrophotometry UV-Visible expressed good validity and can be applied as routine method at laboratory.
关键词： UV-Visible spectrophotometry,inorganic fertilizer,phosphorus,validation,P2O5
更新于2025-09-09 09:28:46