Cysteine-functionalized zwitterionic ZnO quantum dots

被引：21

作者：

Arslan, Osman ^{[1
]}

Singh, Aadesh P. ^{[1
]}

Belkoura, Lhoussaine ^{[2
]}

Mathur, Sanjay ^{[1
]}

机构：

[1] Univ Cologne, Inst Inorgan Chem, D-50939 Cologne, Germany

[2] Univ Cologne, Inst Phys Chem, D-50939 Cologne, Germany

来源：

JOURNAL OF MATERIALS RESEARCH | 2013年 / 28卷 / 14期

关键词：

ZINC-OXIDE; PHOTOLUMINESCENCE PROPERTIES; NANOPARTICLES; PARTICLES; GROWTH; IMMOBILIZATION; MINERALIZATION; LUMINESCENCE; ULTRAVIOLET; AGENTS;

D O I：

10.1557/jmr.2013.161

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Visible light emitting ZnO quantum dots (QDs) were synthesized by a modified sol-gel method and in situ coated with the amino acid cysteine to modify their surface chemistry and govern the crystal growth process. Surface chelation by a hydrophilic thiol such as cysteine offered a fine control over the particle size and modulated the optical emission and its stability by reducing the density of surfacial oxygen deficiencies and also induced the formation of hierarchical nanostructures in the solution. TEM and XRD results confirmed the formation of mono-dispersed and spherical ZnO QDs in the size range 2.5-3.8 nm. The modulation of band gap energies was manifested in the visible emission of cysteine modified QDs, which was found to be remarkably stable for cell labeling applications, when compared to the photoluminescence of conventional ZnO QDs.

引用

页码：1947 / 1954

页数：8

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