Wide emission-tunable CdTeSe/ZnSe/ZnS core–shell quantum dots and their conjugation with E. coli O-157

Journal Article · Fri May 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.01.036· OSTI ID:22475756

Zhou, Haifeng ^[1]; Zhou, Guangjun ^[1]; Zhou, Juan ^[2]; Xu, Dong; Zhang, Xingshuang; Kong, Peng; Yang, Zhongsen ^[1]

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1. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China)
2. Center for Disease Control and Prevention of Jinan Military Command, Jinan 250014 (China)

Highlights: • QDs with variety morphology were obtained via an injection controlled process. • 3-D PL spectra of core–shell QDs show different excitation wavelength dependence. • The PL intensity of QDs with ZnSe transition layer increases dramatically. • Core–shell QDs were processed into aqueous phase and conjugated with E. coli O-157. - Abstract: Wide emission-tunable and different morphological alloyed CdTeSe quantum dots (QDs), CdTeSe/ZnS and CdTeSe/ZnSe/ZnS core–shell QDs were successfully synthesized via an injection controlled process. The effect of injection procedure and reaction temperature were systematically discussed and the growth mechanism was proposed. Most efficient PL wavelength was correlated with reaction time and temperature. The 3-D PL spectra of spherical bare CdTeSe and core–shell QDs with different passivation showed different excitation wavelength dependency. The PL intensity of CdTeSe/ZnSe/ZnS core–shell QDs increased greatly in comparison with that of CdTeSe and CdTeSe/ZnSe QDs. ZnSe transition layer played an important role in improving the PL intensity by providing a smoothened interface and gradient band offsets. The core–shell QDs were transferred into aqueous phase and successfully conjugated with Escherichia coli O-157. The proposed phase-transfer and bio-labeling strategy may be applicable to various QDs with different compositions.

• OSTI ID: 22475756
• Journal Information: Materials Research Bulletin, Vol. 65; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CADMIUM COMPOUNDS
ESCHERICHIA COLI
EXCITATION
FREQUENCY DEPENDENCE
INJECTION
INTERFACES
LAYERS
LUMINESCENCE
PASSIVATION
QUANTUM DOTS
SELENIUM COMPOUNDS
SPECTRA
SYNTHESIS
TELLURIUM COMPOUNDS
WAVELENGTHS
ZINC SELENIDES
ZINC SULFIDES