POLY(N-ISOPROPYL ACRYLAMIDE) MICROGEL DOPED WITH LUMINESCENT PBS QUANTUM DOTS  

作　　者：ZHAO Xusheng GAN Jianqun CHUCHI Sam LIU Guanghua CHEN Aimin 

机构地区：[1]Guangzhou Institute of Chemistry, Chinese Academy of Sciences, P.O. Box 1122, Guangzhou510650, China [2]Department of Electrical ＆ Computer Engineering, University of Toronto 10 King＇s College Rd, Toronto, ON M5S 3G4, Canada

出　　处：《Chinese Journal of Reactive Polymers》2007年第1期55-60,共6页中国反应性高分子（英文版）

基　　金：NSFC(No.50543007);Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry);NSF of Guangdong Province (No.07006838);Tianhe Bureau of Sci. & Techno., Guangzhou.

摘　　要：Thiol-stabilized PbS quantum dots （QDs） with dimensions 3-5 nm capped with a mixture of 1-thioglycerol/dithioglycerol （TGL/DTG） were coUoidally prepared at room temperature. Room temperature photoluminescence quantum efficiency of freshly prepared PbS QDs （7%-11%） remained higher than 5% upon aging for three weeks when the nanocrystals （NCs） were stored in an ice-bath in the dark, and higher than 5%for at least five weeks when extra DTG ligands were introduced into the nanocrystal solution followed by stirring every two weeks. Poly（N-isopropyl acrylamide） （PNIPAM） microgels were produced via precipitation polymerization with dimensions of ca. 230 nm and polydispersity of 3-5%. Incorporation of PbS QDs into PNIPAM microgels indicated that PbS can be incorporated into the interior of microgel particles and not at the microgel interface. The combination of reasonable room temperature quantum efficiency and strong, efficient luminescence covering the 1.3-1.55 μm telecommunication window makes these nanoparticles promising materials in optical devices and telecommunications.Thiol-stabilized PbS quantum dots (QDs) with dimensions 3-5 nm capped with a mixture of 1-thioglycerol/dithioglycerol (TGL/DTG) were colloidally prepared at room temperature. Room temperature photoluminescence quantum efficiency of freshly prepared PbS QDs (7%-11%) remained higher than 5% upon aging for three weeks when the nanocrystals (NCs) were stored in an ice-bath in the dark, and higher than 5% for at least five weeks when extra DTG ligands were introduced into the nanocrystal solution followed by stirring every two weeks. Poly(N-isopropyl acrylamide) (PNIPAM) microgels were produced via precipitation polymerization with dimensions of ca. 230 nm and polydispersity of 3-5%. Incorporation of PbS QDs into PNIPAM microgels indicated that PbS can be incorporated into the interior of microgel particles and not at the microgel interface. The combination of reasonable room temperature quantum efficiency and strong, efficient luminescence covering the 1.3-1.55 μm telecommunication window makes these nanoparticles promising materials in optical devices and telecommunications.

关 键 词：Poly（N-isopropyl acrylamide） microgel PbS quantum dots PHOTOLUMINESCENCE Photoluminescence quantum efficiency Incorporation/infiltration. 

分 类 号：O631[理学—高分子化学]