Effect of the indium myristate precursor concentration on the structural, optical, chemical surface, and electronic properties of InP quantum dots passivated with ZnS

Chemical synthesis and optical, structural, and surface characterization of InP-In2O3 quantum dots

“…2 b confirms the crystalline nature of the QDs. In a previous work by our group, InP nanocrystals were demonstrated to grow randomly oriented [16] . In a similar work, Singh and coauthors synthesized small colloidal InP-based quantum dots with blue emission (sizes ranging from 2 to 5 nm), using trioctylphosphine as a source of phosphorus [21] .…”

“…The band-gap energy ( E g ) of the nanoparticles was determined from the equation ( Ahν ) n = B ( hν − E g ), where hν is the incident photon energy, B is a constant, and A can be referred to as the optical absorption coefficient, α, or as the photoacoustic amplitude, PA amp , which in most important cases is proportional to α [23] . Depending on the electronic transition, n takes different values, being n = 2 for direct band-gap semiconductors, such as InP [16] . The optical absorption spectra for the InP QDs, accomplished by UV–Vis spectrophotometry, are disclosed in Fig.…”

“…For cubic InP, m e = 7.5 × 10 −2 m o and m h = 60 × 10 −2 m o , where m o is the free electron mass, and ε = 12.40 is the permittivity of the sample. From this expression, the QDs size is d = 2 R , where R is the QD radius, considering spherical nanoparticles [16] . The values found by UV–Vis spectrophotometry and PAS are presented in Table 2 .…”

“…For instance, our group recently reported on the structural, optical, chemical surface, and electronic properties of InP@ZnS QDs as a function of the indium myristate (IM) precursor concentration used during the synthesis process. It was found that at higher IM concentrations, the band-gap energy decreased while the QDs size increased [16] . Another alternative is the use of InP-In 2 O 3 QDs.…”

Indium Phosphide Quantum Dots Integrated with Cadmium Sulfide Nanorods for Photocatalytic Carbon Dioxide Reduction

“…The high‐resolution P 2p spectrum (Figure f) contained two contributions. The 2p 1/2 and 2p 3/2 peaks were found at respectively 130.7 eV and 129.8 eV, implying the presence of the phosphide (P 3− ) . Relative to peaks in the XPS spectrum of pure InP (Figure S4), peaks in the XPS spectra of In and P in the CdS‐InP composite were shifted slightly due to the modified chemical environment.…”