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

Zhou, Haifeng; Zhou, Guangjun; Zhou, Juan; Xü, Dong; Zhang, Xingshuang; Kong, Peng; Yang, Zhiguang

doi:10.1016/j.materresbull.2015.01.036

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…InAs, GaAs) (Kabi & Perera, 2015;Uesugi et al, 2015), group II-VI (e.g. CdSe, ZnS) (Bain & Ivanisevic, 2015;Peng, Sampat et al, 2015;Zhou et al, 2015) and group IV (C, Si) semiconductor quantum structures (Abualnaja et al, 2015;Qian et al, 2015;Wolf et al, 2013;Zhang et al, 2012). Another group IV semiconductor, Ge, a close structural and electronic analogue to Si, has received limited attention, but recently there has been significant interest in understanding the optical properties of Ge QDs (Barbagiovanni et al, 2014;Scarselli et al, 2007;Sun, Sue et al, 2005;Wheeler et al, 2013;Little et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Local structure of Ge quantum dots determined by combined numerical analysis of EXAFS and XANES data

et al. 2016

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The sensitivity of X-ray absorption near-edge structure (XANES) to the local symmetry has been investigated in small (∼4 nm) matrix-free Ge quantum dots. The FDMNES package was used to calculate the theoretical XANES spectra that were compared with the experimental data of as-prepared and annealed nanoparticles. It was found that XANES data for an as-prepared sample can only be adequately described if the second coordination shell of the diamond-type structural model is included in the FDMNES calculations. This is in contrast to the extended X-ray absorption fine-structure data that show only the first-shell signal. These results suggest that, despite the high degree of disorder and a large surface-to-volume ratio, as-prepared small Ge quantum dots retain the diamond-type symmetry beyond the first shell. Furthermore, we utilized this sensitivity of XANES to the local symmetry to study annealed Ge quantum dots and found evidence for significant structural distortion which we attribute to the existence of surface disorder in the annealed oxygen-free Ge quantum dots.

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Section: Introductionmentioning

confidence: 99%

Local structure of Ge quantum dots determined by combined numerical analysis of EXAFS and XANES data

et al. 2016

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“…Pons et al reported about NIR-emitting CdTeSe/CdZnS core/shell QDs [2], or CdTeSe/CdZnS in [3], CdTeSe/ZnS [4][5][6][7]. Recently H. Zhou et al reported the synthesis of multishell CdTeSe/ZnSe/ZnS QDs [8]. However, the number of publications concerning the coating of CdTeSe QD with ZnTe and ZnSe is still limited.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structural and Optical Characterization of CdTeSe/ZnSe and CdTeSe/ZnTe Core/Shell Ternary Quantum Dots for Potential Application in Solar Cells

Hưng

Thang

Nong

et al. 2016

Journal of Elec Materi

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International audienceThis work presents the results on the fabrication, structural and optical properties of CdTeSe/ZnTe and CdTeSe/ZnSe n monolayers (ML) (with n = 0,1,2,4 and 6 being the nominal shell monolayer thickness) ternary alloyed core/shell quantum dots (QDs). Transmission electron microscopy has been used to observe the shape and size of the QDs. These QDs crystallize at the zinc-blende phase. Raman scattering has been used to characterize the CdTeSe QDs’ alloy composition in the fabrication and coating processes. The Raman spectrum of CdTeSe QDs, in the frequency range from 100 cm−1 to 300 cm−1, is a composite band with two peaks at 160 cm−1 and 192 cm−1. When the thickness of the ZnTe shell is 4 ML, the peak of the Raman spectrum only appears at 160 cm−1. For the ZnSe 4 ML shell, the peak only appears at ∼200 cm−1. This shows that the nature of the CdTeSe QDs is either CdTe-rich or CdSe-rich depending on the shell of each sample. The shell thickness of 2 ML does not change the ternary core QDs’ crystalline phase. The absorption and photoluminescence spectra show that the absorption and emission bands can be shifted to 900 nm, depending on each ternary alloyed QD core/shell sample. This near-infrared spectrum region is suitable␣for applications in solar cells

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Solar cell sensitized with “green” InP-ZnS quantum dots: Effect of ZnS shell deposition

Zavaraki

Liu

Ågren

2020

Nano-Structures & Nano-Objects

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

Cited by 3 publications

References 42 publications

Local structure of Ge quantum dots determined by combined numerical analysis of EXAFS and XANES data

Local structure of Ge quantum dots determined by combined numerical analysis of EXAFS and XANES data

Synthesis, Structural and Optical Characterization of CdTeSe/ZnSe and CdTeSe/ZnTe Core/Shell Ternary Quantum Dots for Potential Application in Solar Cells

Solar cell sensitized with “green” InP-ZnS quantum dots: Effect of ZnS shell deposition

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