A dual-responsive fluorescent sensor for Hg²⁺ and thiols based on N-doped silicon quantum dots and its application in cell imaging

Abstract

An on–off–on fluorescent sensor based on N-SiQD has the advantages of fast response time and high sensitivity to Hg2+ and GSH.

Fluorescent and Colorimetric Dual-signal Enantiomers Recognition via Enzyme Catalysis: The Case of Glucose Enantiomers Using Nitrogen-doped Silicon Quantum Dots/Silver Probe Coupled with β-D-Glucose Oxidase

“…(Figure 2a), and the X-ray diffraction (XRD) analysis shows a typical broad diffraction peaks in the range of 15-25 degrees and strong Si peak at (111) plane at ~27.2° (Figure 2b), indicating that N-SiQD are in the amorphous phase. 50,51 As for the typical FT-IR analysis of the as-prepared N-SiQD (Figure 2c), the peak at 3354 cm -1 could be ascribed to the N-H stretching vibrations, and the fairly strong absorption peak at 2933 cm -1 can be attributed to O-H bending vibration. Meanwhile, the absorption band appears at 1566 cm -1 indicated the existence of N-H.…”

Nitrogen‐rich silicon quantum dots: facile synthesis and application as a fluorescent ‘on–off–on’ probe for sensitive detection of Hg2+ and cyanide ions

“…Furthermore, the XRD analysis (Figure 1c) shows an amorphous structure of NR‐SiQDs, which matched well with previous reports. [ 25,26 ]…”

“…shows an amorphous structure of NR-SiQDs, which matched well with previous reports. [25,26] To identify the surface functional groups presented in the NR-SiQDs, FTIR spectra were obtained (Figure 2a). The absorption peaks at 3683-3370 cm À1 were related to stretching vibrations of N-H and O-H, while the band at 1602 cm À1 was related to the stretching vibration and the bending vibration of N-H. [23,[27][28][29][30][31] The absorption bands at 1100 and 910 cm À1 were ascribed to the Si-O stretching vibration, while the band at 1049 cm À1 could be related to the Si-C deformation that proved the successful preparation of the SiQDs.…”

Sulfur quantum dot-based “ON–OFF–ON” fluorescence platform for detection and bioimaging of Cr(vi) and ascorbic acid in complex environmental matrices and biological tissues

“…31,42 The LOD was 1.5 mM, computed as 3 times the standard deviation of the FI of the blank (n ¼ 12) divided by K SV (Stern-Volmer constant). 37 This value compares to the World Health Organization (WHO) drinking water standard for Cr(VI) of <50 mg L À1 (<0.96 mM). 20 The LR of the "ON-OFF" system spanned a wide range of 5-1500 mM for Cr(VI) detection (Table S1 †).…”