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Surfactant-assisted reflux synthesis of PbS nanostructures and their properties

Published online by Cambridge University Press:  29 October 2012

Haifeng Zhou ,
Guangjun Zhou ,
Qingqing Du ,
Huifang Bi  and
Juan Zhou
Haifeng Zhou
Affiliation:
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China
Guangjun Zhou*
Affiliation:
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China
Qingqing Du
Affiliation:
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China
Huifang Bi
Affiliation:
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
Juan Zhou
Affiliation:
Center for Disease Prevention and Control of Jinan Military Command, Jinan 250014, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: gjzhou@sdu.edu.cn
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Abstract

Uniform PbS nanostructures with varied morphology have been synthesized by a surfactant-assisted reflux route. ZnS and CdS layers were successfully coated onto PbS nanocrystals by encapsulation or epitaxial growth. The nanocrystals were characterized by x-ray diffraction, (high-resolution) transmission electron microscopy, selected area electron diffraction, and scanning electron microscopy. The truncated cubic nanostructures displayed a symmetric emission band at about 860 nm. Diffuse reflectance infrared (IR) spectroscopy was measured to estimate the band gap. High temperature and high frequency measurements of impedance and permittivity taught that the samples were stable and showed collateral evidence of the existence of epitaxial layers. Measurements illustrate that the luminescent properties of semiconductor PbS nanostructures are closely related to their surface nature, and encapsulation can affect their electrical properties and photoluminescence performance greatly. The study may prove useful in developing high frequency IR sensors and light signal amplification devices.

Keywords

chemical synthesisnanostructuresoptoelectronic
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 22 , 22 November 2012 , pp. 2916 - 2924
Copyright
Copyright © Materials Research Society 2012

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