Synthesis and characterization of CdSe nanocrystals capped with TOPO and pyridine

被引：11

作者：

Luo, Xiang Dong ^{[1
,2
]}

Farva, Umme ^{[1
]}

Nguyen Tam Nguyen Truong ^{[1
]}

Son, Kyung Soo ^{[3
]}

Liu, Pei Sheng ^{[2
]}

Adachi, Chihaya ^{[3
]}

Park, Chinho ^{[1
]}

机构：

[1] Yeungnam Univ, Sch Chem Engn, Gyongsan 712749, South Korea

[2] Nantong Univ, Jiangsu Key Lab ASIC Design, Nantong 226019, Peoples R China

[3] Kyushu Univ, Ctr Future Chem, Nishi Ku, Fukuoka 8190395, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2012年 / 339卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

Blue-shift; Surface electronic density; Time-resolved photoluminescence; CdSe; Pyridine; TOPO; QUANTUM DOTS; OPTICAL-PROPERTIES; ELECTROLUMINESCENCE; STATES; CDTE;

D O I：

10.1016/j.jcrysgro.2011.11.048

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

TOPO-capped CdSe nanocrystals with different sizes were synthesized by a slightly modified Peng and Peng's method, and pyridine-capped CdSe nanocrystals were obtained from TOPO-capped CdSe by exchange of TOPO with pyridine. By applying X-ray powder diffraction. X-ray photoelectron spectroscopy (XPS), transmission electron microscopy, photoluminescence (PL) and time-resolved PL (TRPL) spectroscopy, structural and optical characteristics of TOPO-capped and pyridine-capped CdSe are studied in detail. Analysis results show that, by exchanging the surface ligand from TOPO to pyridine, the crystalline quality and optical properties of CdSe nanocrystals are improved. During surface ligand exchange, the diameter of CdSe is decreased, which is caused by the loss of surface Cd and Se atoms with leaving TOPO molecules. The TRPL results suggest that the localized optical transitions of pyridine-capped CdSe, which result from defects and impurities existing in the nanocrystals, are suppressed, compared with those from the original TOPO-capped CdSe. The PL blue-shifts of pyridine-capped CdSe are also observed, and the PL and XPS results indicate that, when TOPO is substituted by pyridine, the surface electronic density of CdSe is re-distributed. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：22 / 30

页数：9

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