Photoelectronic behaviors of self-assembled ZnSe/ZnS/L-Cys quantum dots synthesized at low temperature

Ren, Limei; Li, K. Y.; Cui, Jian; Shen, Tongde

doi:10.1007/s10854-017-8395-z

Cited by 6 publications

(4 citation statements)

References 55 publications

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“…Two prominent absorption band at 3179 and 2981 cm −1 of pure L-Cys, were observed, which assigned to the symmetric and asymmetric stretching vibration of −CH 2 QDs, it could be seen that the absorption peak of −SH (2542 cm −1 ) in the samples of ZnS/ZnO QDs disappeared. This performance proved that L-Cys was indeed bonded to the surface of ZnO QDs by the −SH group [31]. What's more, the stretching vibration of −C−S (638 cm −1 ) in L-Cys was redshifted to 664 cm −1 [31], which proved the formation of Zn−S.…”

Section: Characterization Of Zns/zno Qdsmentioning

confidence: 74%

“…This performance proved that L-Cys was indeed bonded to the surface of ZnO QDs by the −SH group [31]. What's more, the stretching vibration of −C−S (638 cm −1 ) in L-Cys was redshifted to 664 cm −1 [31], which proved the formation of Zn−S. This result is consistent with the XRD pattern, and further proves that ZnS is formed on ZnO QDs surface after adding L-Cys.…”

Section: Characterization Of Zns/zno Qdsmentioning

confidence: 77%

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Fluorescence ‘turn-on’ probe for Al³⁺ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Yang¹,

Zou²,

Zhao³

et al. 2021

Nanotechnology

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In this work, an efficient and stable fluorescent probe for Al3+ was established. The fluorescent probe based on the fluorescence ‘turn-on’ mode of zinc sulfide crystal composite zinc oxide quantum dots (ZnS/ZnO QDs). The ZnS/ZnO QDs were synthesized via two-step method using L-Cysteine (L-Cys) as a sulfur source and stabilizer. In the synthesis of ZnS/ZnO QDs, the fluorescence of zinc oxide quantum dots (ZnO QDs) decreased and its stability increased in aqueous solution after the addition of L-Cys. In addition, the as-synthesized ZnS/ZnO QDs shows fluorescent enhancement to Al3+. The ZnS/ZnO QDs based fluorescence ‘turn-on’ probe presented wide linear ranges (1 nM–8 μM and 8–100 μM). The availability of as-established sensing probe was also estimated by real water sample tests. Furthermore, the fluorescent enhancing mechanism was carried out by recording the fluorescent lifetime of samples, which might be related to the QDs dispersion and charge transfer weaken.

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Section: Characterization Of Zns/zno Qdsmentioning

confidence: 74%

Section: Characterization Of Zns/zno Qdsmentioning

confidence: 77%

Fluorescence ‘turn-on’ probe for Al³⁺ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Yang¹,

Zou²,

Zhao³

et al. 2021

Nanotechnology

View full text Add to dashboard Cite

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“…[19][20][21][22][23][24][25][26][27] In our previous works, the self-assembled core-shell CdTe/CdS/ligand, CdSe/CdS/ligand, and ZnSe/ZnS/ligand QDs were prepared via the aqueous synthesis way, respectively. [28][29][30][31] The results revealed that the ligand and the shell layer played not negligible roles in the gradual energy band structure of these QDs. For examples, the ligand not only improved the stability of the QDs, but also may change the transport mechanism and adjust the transmission channel of photogenerated free charge carriers (FCCs) in these QDs.…”

Section: Introductionmentioning

confidence: 93%

“…The modified aqueous synthesis of Mn-doped ZnSe QDs capped by L-Cys, similar to Ref. [29], involved the reaction between selenium-, zinc-, and manganese-precursors. First, the selenium precursor was prepared by mixing selenium powder with a NaBH 4 solution under stirring until the reaction was completed.…”

Section: Mn-doped Znse Qds Synthesis and The Qdstf Preparationmentioning

confidence: 99%

Improved carrier transport in Mn:ZnSe quantum dots sensitized La-doped nano-TiO₂ thin film*

Shao¹,

Li²,

Yang³

et al. 2020

Chinese Phys. B

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Mn:ZnSe/ZnS/L-Cys core-shell quantum dots (QDs) sensitized La-doped nano-TiO2 thin film (QDSTF) was prepared. X-ray photoelectron spectroscopy (XPS), nanosecond transient photovoltaic (TPV), and steady state surface photovoltaic (SPV) technologies were used for probing the photoelectron behaviors in the Mn-doped QDSTF. The results revealed that the Mn-doped QDSTF had a p-type TPV characteristic. The bottom of the conduction band of the QDs as a sensitizer was just 0.86 eV above that of the La-doped nano-TiO2 thin film, while the acceptor level of the doped Mn2+ ions was located at about 0.39 eV below and near the bottom of the conduction band of the QDs. The intensity of the SPV response of the Mn-doped QDSTF at a specific wavelength was ∼2.1 times higher than that of the undoped QDSTF. The region of the SPV response of the Mn-doped QDSTF was extended by 191 nm to almost the whole visible region as compared with the undoped QDSTF one. And the region of the TPV response of the Mn-doped QDSTF was also obviously wider than that of the undoped QDSTF. These PV characteristics of the Mn-doped QDSTF may be due to the prolonged lifetime and extended diffusion length of photogenerated free charge carriers injected into the sensitized La-doped nano-TiO2 thin film.

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RuO₂/Cysteine Nanocomposites for High‐Performance Supercapacitors

Zhang,

Guo,

Zhu

et al. 2024

ChemNanoMat

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RuO2/Cysteine (RuO2/Cys) nanocomposites were synthesized using a facile high‐temperature hydrothermal method, with improved specific capacitance and good electrochemical durability. The advantage of using cysteine is that its molecule is rich in ligands such as carboxyl, sulfhydryl, and amino groups, which can be easily bound to hydrated RuO2, thus facilitating its effective dispersion. Analyses of its morphology, structure, and chemical composition showed that the incorporation of L‐cysteine greatly inhibited the agglomeration of RuO2 and improved its dispersion, and the scale of RuO2 was reduced from the original micrometer scale to the nanometer scale. Such structures facilitated proton transfer and electron transfer, so RuO2/Cys nanocomposites showed significantly improved specific capacitance, up to 1221.7 F g‐1, and the energy density was up to 108.6 Wh kg‐1 with a power density of 400.2 W kg‐1 at 1 A g‐1 in a 0.5 M H2SO4 electrolyte. The combination of L‐cysteine with RuO2 also effectively prevented the deformation of RuO2 in the redox process, and the capacitance retention rate was increased to 87.7% compared to 48.8% of pristine RuO2 after 10,000 charging‐discharging cycles. High capacitance performance and improved cyclic stability enable RuO2/Cys nanocomposite a favorable electrode material for wide applications in energy storage.

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Photoelectronic behaviors of self-assembled ZnSe/ZnS/L-Cys quantum dots synthesized at low temperature

Cited by 6 publications

References 55 publications

Fluorescence ‘turn-on’ probe for Al³⁺ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Fluorescence ‘turn-on’ probe for Al³⁺ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Improved carrier transport in Mn:ZnSe quantum dots sensitized La-doped nano-TiO₂ thin film*

RuO₂/Cysteine Nanocomposites for High‐Performance Supercapacitors

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Photoelectronic behaviors of self-assembled ZnSe/ZnS/L-Cys quantum dots synthesized at low temperature

Cited by 6 publications

References 55 publications

Fluorescence ‘turn-on’ probe for Al3+ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Fluorescence ‘turn-on’ probe for Al3+ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Improved carrier transport in Mn:ZnSe quantum dots sensitized La-doped nano-TiO2 thin film*

RuO2/Cysteine Nanocomposites for High‐Performance Supercapacitors

Contact Info

Product

Resources

About

Fluorescence ‘turn-on’ probe for Al³⁺ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Fluorescence ‘turn-on’ probe for Al³⁺ detection in water based on ZnS/ZnO quantum dots with excellent selectivity and stability

Improved carrier transport in Mn:ZnSe quantum dots sensitized La-doped nano-TiO₂ thin film*

RuO₂/Cysteine Nanocomposites for High‐Performance Supercapacitors