Premium
Large‐Scale Synthesis of High‐Quality Metal Sulfide Semiconductor Quantum Dots with Tunable Surface‐Plasmon Resonance Frequencies
Author(s) -
Kanehara Masayuki,
Arakawa Hisamitsu,
Honda Tetsuya,
Saruyama Masaki,
Teranishi Toshiharu
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201159
Subject(s) - dispersity , quantum dot , photoluminescence , surface plasmon resonance , materials science , nucleation , quantum yield , nanocrystal , noble metal , copper , metal , photochemistry , nanotechnology , nanoparticle , chemistry , optoelectronics , optics , organic chemistry , fluorescence , polymer chemistry , physics , metallurgy
High‐quality CdS and Cu 7 S 4 quantum dots (QDs) were synthesized with N , N ‐dibutylthiourea (DBTU) as an organic sulfur source. In this method, nucleation and growth reactions were controlled simply by the heating rate of the reaction. The mild oxidation conditions gave monodisperse CdS QDs exhibiting pure band‐edge emission with relatively high photoluminescence quantum yield. During the synthesis of Cu 7 S 4 QDs, the addition of dodecanethiol to the reaction system controlled the reaction rate to give monodisperse spherical or disk‐shaped QDs. A hundred‐gram scale of copper precursor could be used to generate the high‐quality Cu 7 S 4 QDs, indicating that an industrial‐scale reaction is achievable with our method. As observed in anisotropic noble‐metal nanocrystals, larger disk‐shaped Cu 7 S 4 QDs showed lower localized‐surface‐plasmon resonance energy in the near‐infrared region. The disk‐shaped Cu 7 S 4 QDs could be used effectively as templates to form cation‐exchanged monodisperse disk‐shaped CdS QDs.