研究目的
Investigating the environmentally friendly synthesis of monodisperse and bright blue emitting Cd0.15Zn0.85S quantum dots using substituted thioureas as sulfur sources.
研究成果
Highly photoluminescent (PL QY up to 67 %), morphologically and structurally homogeneous blue-emitting Cd0.15Zn0.85S QDs were successfully synthesized using environmentally friendly substituted thioureas as sulfur sources. The study demonstrated the influence of temperature and substituents' nature on the optical and structural properties of QDs.
研究不足
The study focuses on the synthesis and characterization of Cd0.15Zn0.85S QDs using specific substituted thioureas. The scalability of the synthesis methods and the potential environmental impact of the organic solvents used are not discussed.
1：Experimental Design and Method Selection
The study employed one-pot and hot-injection methods to synthesize Cd0.15Zn0.85S QDs in an organic disperse medium using N,N′-disubstituted and N,N′,N′-trisubstituted thioureas as sulfur sources. The influence of temperature and the chemical nature of starting materials on nucleation, structure, and optical properties was systematically investigated.
2：Sample Selection and Data Sources
Samples were synthesized using cadmium oxide (CdO), zinc oxide (ZnO), oleylamine (OAm), linoleic acid (LA), and 1-octadecene (ODE) as starting materials. Substituted thioureas were synthesized from corresponding isothiocyanates and amines.
3：List of Experimental Equipment and Materials
Cadmium oxide (CdO, 99.99 %), zinc oxide (ZnO, 99 %), oleylamine (OAm, technical grade, 70 %), linoleic acid (LA, technical grade, 60-74 %), 1-octadecene (ODE, technical grade, 90 %), phenyl isothiocyanate (98 %), allyl isothiocyanate (95 %), carbon disulfide (CS2, 99 %) isobutylamine (99 %), morpholine (99 %), aniline (99.5 %), 2,4,6-trichloro-1,3,5-triazine (TCT, 99 %) chloroform-d (CDCl3, 99.8 atom % D) and silica gel (high-purity grade, pore size 60 ?, 230 - 400 mesh particle size).
4：Experimental Procedures and Operational Workflow
Syntheses were carried out under an Ar atmosphere using standard Schlenk techniques. The one-pot and hot-injection methods were used to synthesize QDs at temperatures ranging from 220 to 300 °C. The growth of QDs was monitored by taking aliquots at different time intervals for optical properties measurements.
5：Data Analysis Methods
Optical properties were measured using Fluorometer PTI QuantaMaster 400 and UV-3600 spectrometer. Structural analysis was performed using XRD, TEM, and EDS. Thermal stability was examined by thermogravimetric analysis (TG).
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Carbon disulfide
CS2
Sigma-Aldrich
Starting material for the synthesis of substituted thioureas
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Isobutylamine
i-BuNH2
Sigma-Aldrich
Starting material for the synthesis of substituted thioureas
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2,4,6-trichloro-1,3,5-triazine
TCT
Sigma-Aldrich
Catalyst in the synthesis of isobutyl isothiocyanate
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Chloroform-d
CDCl3
Sigma-Aldrich
Solvent for NMR spectroscopy
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Cadmium oxide
CdO
Sigma-Aldrich
Starting material for the synthesis of Cd0.15Zn0.85S QDs
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Zinc oxide
ZnO
Sigma-Aldrich
Starting material for the synthesis of Cd0.15Zn0.85S QDs
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Oleylamine
OAm
Sigma-Aldrich
Surfactant in the synthesis of QDs
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Linoleic acid
LA
Sigma-Aldrich
Surfactant in the synthesis of QDs
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1-octadecene
ODE
Sigma-Aldrich
Solvent in the synthesis of QDs
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Phenyl isothiocyanate
Sigma-Aldrich
Starting material for the synthesis of substituted thioureas
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Allyl isothiocyanate
Sigma-Aldrich
Starting material for the synthesis of substituted thioureas
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Morpholine
Sigma-Aldrich
Starting material for the synthesis of substituted thioureas
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Aniline
Sigma-Aldrich
Starting material for the synthesis of substituted thioureas
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Silica gel
Sigma-Aldrich
Purification of organic precursors and QDs
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Sodium hydroxide
NaOH
Fisher Scientific
Purification of organic precursors and QDs
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Hydrochloric acid
HCl
Fisher Scientific
Purification of organic precursors and QDs
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Potassium carbonate
K2CO3
Fisher Scientific
Purification of organic precursors and QDs
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Bruker 400 UltraShieldTM spectrometer
Bruker
Recording NMR spectra
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Vertex 70v FTIR spectrometer
Bruker
Recording IR spectra
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PANalytical EMPYREAN powder X-ray diffractometer
PANalytical
Registering XRD patterns
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