Synthesis, photoluminescence properties and sensing applications of luminescent sulfur nanodots

Abstract

Sulfur nanodots (S-dots), composed of elemental sulfur core and surface ligands, show unexpected photoluminescence (PL) properties, with the unique features of nontoxicity, hydrophilicity, high stability and easy of modification. This...

Emergence of long afterglow and room temperature phosphorescence emissions from ultra-small sulfur dots

“…1c) with a prominent lattice spacing of 0.217 nm, which corresponds to the (206) diffraction plane of sublimed sulfur. [29][30][31] S dot HRTEM images 100 nm Furthermore, the chemical/elemental compositions of S-dots are confirmed by the XPS study.…”

“…1f) exhibit three distinct peaks at around 560, 800, and 1100 cm À1 . 29,31,33,34 The broad peaks ranging from 500 cm À1 to 650 cm À1 correspond to the formation of shorter chain polysulfides such as S 4 À and S 5 À . The medium intense peak at around B800 cm À1 can be assigned to the stretching vibrations of C-O groups, which are coming from the PEG molecules over the S-dots.…”

Photoluminescence investigations of sulfur quantum dots synthesized by a bubbling-assisted strategy

“…Furthermore, the size and surface groups pose signicant challenges to regulating the synthesis, surface structure, and size of S-dots and unveiling their emission mechanism. [12][13][14] A top-down strategy through etching bulk elemental sulfur into quantum dots under the passivation of ligands is the most widely employed synthesis method, where assembling and ssion of S-dots are involved and contest each other. 7,11,14 However, limited by the relatively long reaction time for reaching a dynamic equilibrium and the ultra-small energy barrier between the assembling and ssion effect, the reaction mechanisms are complicated to characterize, let alone to study their fundamental emission mechanisms.…”

“…Much effort was made to modulate the "assemble-ssion" process. 1,13 Our group introduced ultrasonication treatment to prevent the assembling process, and luminescent S-dots was obtained within 10 h. 15 Zhou's group reported that providing the synthesis system with a pure oxygen atmosphere can change the reaction route by oxidizing polysulde species into elemental sulfur. 16 Although these approaches accelerated the synthesis of monodispersed Sdots with excellent luminescence properties, the severe oxidation-reduction conditions prevented the characterization of reaction intermediates and concealed the relationships between the interfacial/surface structure and S-dots' PL properties.…”

Structural and Optical Properties of Pure and Sulfur-Doped Silicate–Phosphate Glass

“…Recently, there has been interest in research on luminescent lead sulfide quantum dots in glass enriched in sulfur [ 29 , 30 , 31 ]. There is a growing interest in families of special glass that involve chalcogenide glass systems, e.g., As–S and Ge-S, due to their promising properties, such as the transmission in the middle and far infrared regions of spectra, lower values of phonon energies, and higher values of refractive indexes compared to SiO 2 [ 32 , 33 ].…”