“…These peaks were in good agreement with previous work 24 . The high broad peak at about 3381.61 cm −1 can be due to the O–H stretching and H 2 O bending modes 23 . Figure 3 FTIR spectra of non-annealed and ZnS QDs annealed at 240 and 340 °C.…”
Section: Resultsmentioning
confidence: 99%
“…The bands and peaks of spectral absorption observed between 670 cm −1 and 480 cm −1 were due to stretching of Zn–S vibration modes which is consistent with previous studies 15 . The peak at 1014 cm −1 may be assigned to organic compounds, which may come from the alcohol used in the FTIR crucible cleaning process 23 , whereas the absorption bands with peaks at 1405 cm −1 and 1563 cm −1 which can be assigned to the symmetric stretching vibration of –COO − ions. These peaks were in good agreement with previous work 24 .…”
ZnS quantum dots (QDs) were fabricated using the co-precipitation technique with no capping agent. The effects of different annealing temperatures (non-annealed, 240 °C and 340 °C for 2 h) on the structural and optical characteristics of ZnS QDs are reported. The samples were examined by XRD, TEM, PL, FTIR, and UV–Vis. An increase in annealing temperature led to an increase in the dot size and a lowering of the energy band gap (EG). The average crystallite size, D of ZnS was between 4.4 and 5.6 nm. The ZnS QDs showed a band gap of 3.75, 3.74 and 3.72 eV for non-annealed, 240 °C, and 340 °C annealed samples. The reflection spectra increased in the visible light and decreased in UV region with an increase in annealing temperature. This work showed that the band gap and size of ZnS QDs could be tuned by varying the annealing temperature.
“…These peaks were in good agreement with previous work 24 . The high broad peak at about 3381.61 cm −1 can be due to the O–H stretching and H 2 O bending modes 23 . Figure 3 FTIR spectra of non-annealed and ZnS QDs annealed at 240 and 340 °C.…”
Section: Resultsmentioning
confidence: 99%
“…The bands and peaks of spectral absorption observed between 670 cm −1 and 480 cm −1 were due to stretching of Zn–S vibration modes which is consistent with previous studies 15 . The peak at 1014 cm −1 may be assigned to organic compounds, which may come from the alcohol used in the FTIR crucible cleaning process 23 , whereas the absorption bands with peaks at 1405 cm −1 and 1563 cm −1 which can be assigned to the symmetric stretching vibration of –COO − ions. These peaks were in good agreement with previous work 24 .…”
ZnS quantum dots (QDs) were fabricated using the co-precipitation technique with no capping agent. The effects of different annealing temperatures (non-annealed, 240 °C and 340 °C for 2 h) on the structural and optical characteristics of ZnS QDs are reported. The samples were examined by XRD, TEM, PL, FTIR, and UV–Vis. An increase in annealing temperature led to an increase in the dot size and a lowering of the energy band gap (EG). The average crystallite size, D of ZnS was between 4.4 and 5.6 nm. The ZnS QDs showed a band gap of 3.75, 3.74 and 3.72 eV for non-annealed, 240 °C, and 340 °C annealed samples. The reflection spectra increased in the visible light and decreased in UV region with an increase in annealing temperature. This work showed that the band gap and size of ZnS QDs could be tuned by varying the annealing temperature.
“…18 Fig. 3 (A) PL emission of ZnS QDs, 24 (B) TEM and SAED images of pure ZnS, 25 and (C) ZnS XRD patterns at three different pH levels. 26 exchange reaction enables the temporal separation of the growth process of the nanocrystals from the doping of dopant ions into host nanocrystals.…”
Section: Doping: a Mechanistic Overviewmentioning
confidence: 99%
“…Non-transition elements can serve as charge compensators for transition element dopants, helping to balance the charge of the system. 23,24 3. Structural modification: some non-transition elements can induce changes in the lattice structure of ZnS, altering its crystalline phase or lattice parameters.…”
Section: Introductionmentioning
confidence: 99%
“…Non-transition elements can serve as charge compensators for transition element dopants, helping to balance the charge of the system. 23,24…”
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