Paper Title:
Preparation and Photoluminescence of Hybrid SiO2-Coated CdTe Nanocrystals
  Abstract

Novel hybrid SiO2-coated CdTe core-shell nanocrystals (NCs) were fabricated by re-dispersing green-emitting CdTe NCs in a solution of Cd2+ ions, thioglycolic acid (TGA), tetraethyl orthosilicate and ammonia with a sol-gel reaction at room temperature and a further reflux procedure. The hybrid NCs consisted of a CdTe core and a hybrid SiO2 shell with CdS-like clusters. The clusters created by the reaction of Cd2+ and S2- generated by the decomposition of TGA during reflux. The hybrid NCs exhibited tunable photoluminescence (PL) color from green to red and high PL quantum yield (PLQY). The CdS-like clusters play an important role for the hybrid NCs with numerous PL properties. Compared with initial CdTe NCs, the PLQY of the hybrid NCs increased from 18% to 47% together with a red-shifted PL peak wavelength of 61 nm. The average lifetime of the hybrid NCs (39 ns) is longer than that of initial CdTe NCs (25 ns). The high PLQY and the hybrid shell make CdTe NCs an important application for biological technique.

  Info
Periodical
Advanced Materials Research (Volumes 306-307)
Chapter
Chapter 9: Nano Materials
Edited by
Shiquan Liu and Min Zuo
Pages
1194-1197
DOI
10.4028/www.scientific.net/AMR.306-307.1194
Citation
N. Liu, Z. M. Yuan, J. Yang, Y. L. Zhang, R. L. Zhang, Y. Q. Cao, A. Y. Zhang, Y. N. Zhu, P. Yang, "Preparation and Photoluminescence of Hybrid SiO2-Coated CdTe Nanocrystals", Advanced Materials Research, Vols. 306-307, pp. 1194-1197, 2011
Online since
August 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Jie Yang, Yu Lan Zhang, Rui Li Zhang, Ning Liu, Zhi Min Yuan, Ai Yu Zhang, Yong Qiang Cao, Yuan Na Zhu, Ping Yang
Chapter 9: Nano Materials
Abstract:Highly luminescent CdSe/CdxZn1-xS core-shell quantum dots (QDs) were synthesized using CdSe cores with the size range...
1203
Authors: Huai Qing Huang, Jin Ling Liu, Bao Fu Han, Shu Kun Xu
New Functional Materials
Abstract:CdTe/CdS/ZnS core-shell-shell (CSS) quantum dots (QDs) were synthesized in aqueous solution via water-bathing combined hydrothermal method...
348
Authors: Sheng Nan Sun, Shi Liu, Feng Xu, Li Fen Cao, Jia Jia Cao, Jing Wang, Li Min Ma, Hai Ning Cui
Chapter 1: Materials Design
Abstract:Cadmium sulfide (CdS) film by evaporation deposition and CdS/Cuprous sulfide (Cu2S) complex film by dipping were obtained on glass...
133
Authors: Chen Gui Li, Chao Ye, Jie Yu, Fang Zhou, Wen Ying Zhong, Zheng Yu Yan, Yu Zhu Hu
Chapter 9: New Functional Materials
Abstract:We report the synthesis and characterization of highly luminescent quantum dots consisting of CdHgTe cores protected with double inorganic...
1417
Authors: Xiaoyan Mou, Chuan Rong, Xiao Li Dong, Xin Xin Zhang, Chun Ma, Xiu Fang Zhang, Hong Chao Ma, Fei Shi, Mang Xue
Chapter 7: Pollution Control (Air, Water, Solid)
Abstract:CdS/ZnS/TiO2 composite photocatalyst was prepared by sol-gel and immersion method. The optimum preparation conditions were as...
1620