Synthesis and Characterization of CdSe Quantum Dots by UV-Vis Spectroscopy

Rapid Microwave Synthesis of Tunable Cadmium Selenide (CdSe) Quantum Dots for Optoelectronic Applications

“…Plots show that as diameter increases, the LUMO level decreases and the HOMO level increases, effectively "shrinking" the band gap. This verifies the band gap calculation discussed earlier [19,31]. Figure 6(b) shows the decrease in band gap for CdSe QDs, and the increase in standard deviation, which is consistent with literature [41].…”

“…For this study, safe synthesis methods that utilized recipes with temperatures of 225°C did not yield a PL wavelength lower than approximately 550 nm (~5.4 nm diameter), even for synthesis times between 0 and 30 seconds. It is known that the wavelength range for the color green in the visible spectrum is roughly between 520 and 565 nm [31]. Therefore, the 225°C microwave synthesis temperature was incapable of producing smaller QDs closer to the blue region.…”

Lactoperoxidase catalytically oxidize hydrogen sulfide via intermediate formation of sulfheme derivatives

“…Hydrogen sulfide can favourably coordinate to the available coordination site of heme metal centers and reduce the iron ion in a subsequent reaction [ 15 , 16 ]. It can also modify the prosthetic group via sulfur incorporation into one of the pyrrole rings of the porphyrin frame at β-pyrrole positions, resulting in the formation of sulfheme species [ 12 , 33 ]. Several (but not all) heme proteins form the corresponding sulfheme derivative including hemoglobin (Hb) [ 34 – 36 ], myoglobin (Mb) [ 35 – 39 ] or catalase (CAT) [ 39 , 40 ] and based on UV–vis spectroscopic data this reaction was also proposed for LPO [ 41 ].…”