Spinel structured MgAl2O4 nanoparticles as a low-cost and stable SERS substrate for rapid simultaneous detection of neurological drugs in biofluids

FeS2-based aerogel as a flexible low-cost substrate for rapid SERS detection of histamine in biofluids

“…20 Similarly, histamine molecules have a highest occupied molecular orbital (HOMO) at À6.209 eV and a lowest unoccupied molecular orbital (LUMO) at À1.650 eV. 21 The excitation of electrons of FeS 2 -AG and histamine molecules leads to a notable enhancement in the SERS signal.…”

Dual‐Modal Fluorescence‐SERS Detection of Blood Glucose Engineered by Hierarchical Laser‐Induced Micro/Nano Structures for Diabetes Screening

“…First, the homogeneity of the substrate was verified by acquiring SERS spectra of R6G solution at 10 -3 mol L −1 from 50 × 50 points (2500 spectra, step size 200 µm in X direction, 200 µm in Y direction) covering the whole area of 10 mm × 10 mm. [40,41] The 1650 cm −1 Raman band of these spectra was then plotted in Figure S2 (Supporting Information) to give a spatial map of enhancement from the substrate. It can be seen that the substrate provides unambiguous and uniform SERS spectra over the whole tested area with a relative standard deviation (RSD) of 8.75%.…”

“…The SERS spectrum is dominated by the bands at 998,1021, and 1074 cm -1 , which are assigned to the β CCC+ ν CS (1), β CH (18a), and β CCC (12) modes, respectively, and belong to in-plane modes; The band at 1184 and 1284 cm -1 are assigned to the 3(b2), β CH +β BOH and 9a(a1), β CH +β BOH , respectively; The bands at 1586 cm -1 is ascribed to the original and OH-associated forms of in-plane ν CC (8a). [41,47] The bands at 1586 cm -1 is corresponding to the to the Cyano group (CN) functionalized 4-CPBA molecules, as the boronic acid group straddled the left set of synperiplanar arranged diol group in glucose. [25] Figure 5b shows the relationship between the glucose concentration and the intensity of the SERS peak of CN stretch at 2226 cm -1 .…”