PbS量子点的一步合成法及其光学性能

One-step Synthesis and Optical Properties of PbS Quantum Dots

以Pb(CH3COO)2为原料,一硫代和二硫代丙三醇为混合稳定剂,在常温下合成了尺寸可控的PbS量子点.有别于传统的有机金属路线法,采用水相法一步合成亲水性量子点具有方法简便、反应条件温和、无需使用高沸点溶剂、重现性好等优点.所合成的量子点单分散,粒径为3～5nm,荧光量子效率高达11.8%,在外加稳定剂的作用下,量子效率在5周内仍能保持原来的80%。

Size-tunable PbS quantum dots were synthesized using 1-thioglycerol and dithioglycerol as stabilizers via a facile one-step synthetic method. Instead of the traditional organometallic route, in which toxic precursors or solvents might be used, the wet chemical approach demonstrated in this paper is superior in terms of simplicity, use of nontoxic materials, mild synthetic condition and good reproducibility. The resultant PbS quantum dots are monodispersed with particle size ranging from 3 to 5 nanometers. Photoluminescence quantum efficiency of the as-synthetic quantum dots is up to 11.8% and can be maintained by 80% within five weeks with additional capping agents introduced into the storage vessel.