Journal: Analytical Science Advances

Article Title: Sensitive and high laser damage threshold substrates for surface‐enhanced Raman scattering based on gold and silver nanoparticles

doi: 10.1002/ansa.202300033

Figure Lengend Snippet: FIGURE 3 (A) Background-corrected Raman spectra of melamine powder, melamine deposited from a 1000 ppm solution on Al foil and 0.1 ppm melamine solutions dropcast on the investigated SERS substrates, measured at (A) 1064 nm excitation wavelength (140 mW; 100 averaged scans) and (B) 785 nm excitation wavelength (108 mW, 32 mW for melamine powder; 1 s integration time, 10 averaged scans). The spectra were averaged over three different measurement spots on the samples. For the sake of visibility of the other spectra, the Raman intensity of the spectrum for melamine powder in (B) was divided by a factor of 8.

Article Snippet: Raman spectroscopy at an excitation wavelength of 785 nm was performed on a Wasatch Photonics WP Raman spectrometer equipped with a fibre-coupledRamanprobeproviding laser excitationwith a spot size of ca.

Techniques:

Journal: Analytical Science Advances

Article Title: Sensitive and high laser damage threshold substrates for surface‐enhanced Raman scattering based on gold and silver nanoparticles

doi: 10.1002/ansa.202300033

Figure Lengend Snippet: FIGURE 4 Average background-corrected Raman spectra of a blank AgNPL SERS substrate on Al foil and of melamine deposited from solutions with concentrations ranging between 0.1 and 10 ppm onto AgNPL substrates, measured at an excitation wavelength of (A) 1064 nm (140 mW) and (C) 785 nm (108 mW). Integrated peak area of the melamine peaks centred at 687–710 cm−1 plotted versus decadic logarithm of the melamine concentration cmelamine measured at excitation wavelengths of (B) 1064 nm and (D) 785 nm, averaged over three different spots on the samples. The insets in (B) and (D) show the peak area versus concentration curves on a linear scale for the lower melamine concentrations and the corresponding linear fit functions.

Article Snippet: Raman spectroscopy at an excitation wavelength of 785 nm was performed on a Wasatch Photonics WP Raman spectrometer equipped with a fibre-coupledRamanprobeproviding laser excitationwith a spot size of ca.

Techniques: Concentration Assay

Journal: Analytical Science Advances

Article Title: Sensitive and high laser damage threshold substrates for surface‐enhanced Raman scattering based on gold and silver nanoparticles

doi: 10.1002/ansa.202300033

Figure Lengend Snippet: FIGURE 5 Average background-corrected Raman spectra of the blank 4n SERS substrate and of melamine deposited from solutions with concentrations ranging between 0.05 and 10 ppm onto the 4n SERS substrates, measured at an excitation wavelength of (A) 1064 nm (140 mW) and (C) 785 nm (108 mW). Integrated peak area of the melamine peaks centred at 687–710 cm−1 plotted versus decadic logarithm of the melamine concentration cmelamine measured at excitation wavelengths of (B) 1064 nm and (D) 785 nm, averaged over three different spots on the samples. The insets in (B) and (D) show the peak area versus concentration curves on a linear scale for the lower melamine concentrations and the corresponding linear fit functions.

Article Snippet: Raman spectroscopy at an excitation wavelength of 785 nm was performed on a Wasatch Photonics WP Raman spectrometer equipped with a fibre-coupledRamanprobeproviding laser excitationwith a spot size of ca.

Techniques: Concentration Assay

Journal: Analytical Science Advances

Article Title: Sensitive and high laser damage threshold substrates for surface‐enhanced Raman scattering based on gold and silver nanoparticles

doi: 10.1002/ansa.202300033

Figure Lengend Snippet: FIGURE 6 Background-corrected Raman spectra of 0.1 and 1 ppm melamine solutions dropcast-deposited on (A and B) AgNPL-based SERS substrates and (C and D) 4n SERS substrates, respectively, measured at increasing laser power at 1064 nm (A and C) and 785 nm (B and D) on the same measurement spot. The insets show the integrated peak area of the characteristic melamine peak versus the excitation laser power fitted with a linear function.

Article Snippet: Raman spectroscopy at an excitation wavelength of 785 nm was performed on a Wasatch Photonics WP Raman spectrometer equipped with a fibre-coupledRamanprobeproviding laser excitationwith a spot size of ca.

Techniques:

Journal: Analytical Science Advances

Article Title: Sensitive and high laser damage threshold substrates for surface‐enhanced Raman scattering based on gold and silver nanoparticles

doi: 10.1002/ansa.202300033

Figure Lengend Snippet: FIGURE 7 Background-corrected Raman spectra of rhodamine 6G (R6G) powder, R6G deposited from a 1000 ppm solution on Al foil and 0.1 or 1 ppm R6G solutions dropcast on the investigated SERS substrates, measured at 1064 nm excitation wavelength (140 mW, 100 averaged scans). The spectra were averaged over three different measurement spots on the samples. For the sake of visibility, the Raman intensity of the spectrum for R6G powder was divided by a factor of 5.

Article Snippet: Raman spectroscopy at an excitation wavelength of 785 nm was performed on a Wasatch Photonics WP Raman spectrometer equipped with a fibre-coupledRamanprobeproviding laser excitationwith a spot size of ca.

Techniques: