Synthesis and Properties of Monodisperse Colloidal Lead Sulfide Quantum Dots

• Main Authors: GUO, SHENG-HORNG, 郭聖宏
• Other Authors: JUANG, YUNG-DER
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/w2s5sc

碩士 === 國立臺南大學 === 材料科學系碩士班 === 107 === Inorganic lead chalcogenide quantum dots (PbX, X = S, Se, and Te) with the unique photoluminescence in the infrared region has recently acquired much advancement in the synthesis of homogeneous nanoparticles, and these empower them with various advantages in the optoelectronics applications in infrared range. Nevertheless, the research and development of PbS QDs have lasted in the past two decades. PbS QDs still lag the mature II-VI and III-V QDs material (CdSe, InP, InAs, etc.) which have been widely used in market. Herein, we prepared PbS QDs with different S/Pb ratios, reaction temperatures, and reaction times by the hot injection method, then the results are analyzed to choose the best reaction parameters. The photoluminescence of PbS QDs with widely tunable wavelength (900~1650 nm), narrow absorption line widths (FWHM<110 nm), and narrow particle size distributions (<10%) can be obtained. In addition, the purification of the PbS QDs has been studied in details. The removal of the unreacted PbCl2 and excess solvent that are formed as soluble Pb precursors in the synthesis has been paid special attention. Furthermore, the wavelength shift, kinetics, and the long-term stability of the final products are studied for the cation exchange of colloidal PbS nanoparticles under different temperatures.