Microwave-mediated nonaqueous synthesis of quantum dots at moderate temperature.
The use of microwave irradiation to accelerate both inorganic and organic chemical reactions has attracted widespread attention. Generally, microwave-mediated synthesis of quantum dots (QDs) has been conducted in aqueous solution. Here, using commercial diesel and glycerol as reaction medium, a microwave-mediated nonaqueous method toward CdSe QDs with size-tunable photoluminescent properties produces oleic-acid-protected QDs at moderate reaction temperatures of 50-140 degrees C, which are much lower than the current temperature necessary for the synthesis of CdSe QDs in organic solvents. The appropriate condition optimization for high-quality CdSe QDs shows that different sizes of CdSe QDs with emission wavelengths between 450 and 600 nm have been synthesized through varying time, temperature, feed ratio, and reaction medium.
Zhu
Ming-Qiang
MQ
Center for Biomedical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan 410082, China. mqzhu@hnu.cn
Gu
Zheng
Z
Fan
Jun-Bing
JB
Xu
Xiao-Bo
XB
Cui
Jing
J
Liu
Jin-Hua
JH
Long
Feng
F
D002104:Cadmium / Q000737:chemistry; D003460:Crystallization; D008670:Metals; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008872:Microwaves; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry; D010777:Photochemistry / Q000379:methods; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
D008670:Metals; D010087:Oxides; D012997:Solvents; D002104:Cadmium; D014867:Water; D012643:Selenium