Challenges and opportunities for SERS in the infrared: materials and methods

Abstract

In the wake of a global, heightened interest towards biomarker and disease detection prompted by the SARS-CoV-2 pandemic, surface enhanced Raman spectroscopy (SERS) poses again itself at the forefront of...

Gold-Deposited Graphene Nanosheets for Self-Cleaning Graphene Surface-Enhanced Raman Spectroscopy with Superior Charge-Transfer Contribution

“…Figure c shows the Raman spectra of G0 and GAu substrates with a NIR (785 nm) laser excitation wavelength. The NIR excitation wavelength is extensively utilized for fluorescence quenching and maximizing the sensitivity of the substrates. , The corresponding NIR Raman spectra of the bare graphene (G0) substrate exhibit intense D- and G-bands at ∼1306 and 1586 cm –1 , respectively. For GAu2 substrate, the deposition of Au coating over graphene results in the increased intensity of the D-band and reduced intensity of the G-band with peak positions of 1307 and 1595 cm –1 , respectively, as well as the D̀-band at ∼1620 cm –1 .…”

Surface-Enhanced Raman Scattering Nanosensing and Imaging in Neuroscience

“…Within the SWIR range, excitation wavelengths of 1064, 1280, and 1319 nm are commonly used for SERS and SERRS measurements. 298 These longer excitation wavelengths require switching some of the optics and using an InGaAs detector, as the silicon detector's quantum efficiency drops at wavelengths higher than 900 nm. 299 In addition, optimization of the plasmonic properties of metallic nanoparticles will be necessary to achieve sufficiently high enhancement for neurotransmitter detection at physiological concentrations.…”

“…To achieve this, longer wavelengths are being considered, as scattering from the background decreases and absorption is lower in the second biological window between 1000 and 1400 nm laser wavelengths (Figure (ii)). Within the SWIR range, excitation wavelengths of 1064, 1280, and 1319 nm are commonly used for SERS and SERRS measurements . These longer excitation wavelengths require switching some of the optics and using an InGaAs detector, as the silicon detector’s quantum efficiency drops at wavelengths higher than 900 nm .…”

In Situ Raman Spectroscopic Studies of Electrochemical CO2 Reduction on Cu-Based Electrodes

“…Nevertheless, SERS still faces challenges related to material and morphology limitations. 62,63 In 2010, our group introduced shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS), in which the plasmonic metal core is coated with a dense, ultrathin, and pinhole-free silica shell. 64−66 This innovative approach resolves the issues of traditional SERS associated with morphology and material universality and greatly expands SERS applications in catalysis.…”

“…To overcome this limitation, SERS was invented in the 1970s based on electromagnetic enhancement mechanisms. , It was subsequently discovered that nanoscale rough metal surfaces such as Au, Ag, and Cu exhibit remarkable SERS effects. , This unique advantage proves particularly relevant for studying intermediates involved in CO 2 RR. Nevertheless, SERS still faces challenges related to material and morphology limitations. , In 2010, our group introduced shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS), in which the plasmonic metal core is coated with a dense, ultrathin, and pinhole-free silica shell. − This innovative approach resolves the issues of traditional SERS associated with morphology and material universality and greatly expands SERS applications in catalysis.…”