Structural, luminescent and antimicrobial properties of ZnS and CdSe/ZnS quantum dot structures originated by precursors

Kumari, Asha; Thakur, Nagesh; Vashishtt, Jitendraa; Singh, Ragini Raj

doi:10.1016/j.saa.2019.117962

Cited by 12 publications

(4 citation statements)

References 31 publications

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“…Meanwhile, another prominent peak appears at ∼161.7 cm −1 and become stronger progressively at stage II, matching well with the Zn−S vibrations of ZnS. 53 As the peak intensity of CuS recovers again during the charge process, the intensity of the ZnS drops. Such a reversible change can also be verified in CuS@CTMAB electrodes after different cycles (Figure S5b).…”

Section: Mechanism Investigationsupporting

confidence: 57%

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Activating the Stepwise Intercalation–Conversion Reaction of Layered Copper Sulfide toward Extremely High Capacity Zinc-Metal-Free Anodes for Rocking-Chair Zinc-Ion Batteries

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Conventional zinc-ion batteries (ZIBs) are severely hindered by the inherent drawbacks of Zn metal anodes including dendrite growth, side reactions, and interface passivation. Developing intercalation-type anodes to fabricate rocking-chair ZIBs is a promising approach to overcome the above issues. However, the low capacity resulting from the limited transfer electron number of intercalation reactions impedes their practical applications. Herein, we report an effective strategy to break the capacity limit of layered CuS materials as a Zn-metal-free anode through activating its intrinsic conversion reaction. It is found that the preintercalation of cetyltrimethylammonium bromide in CuS (CuS@ CTMAB) significantly lowers the energy barrier of the conversion reaction, thus realizing a record-breaking capacity (367.4 mAh g −1 at 0.1 A g −1 ) as a Zn-metal-free anode based on the reversible conversion of Cu 2+ /Cu 0 . Theoretical calculation, ex situ microscopy, and spectroscopy results verify that the characteristic stepwise intercalation−conversion reaction route occurred in CuS@CTMAB. Moreover, the moderate structure transformation and good electronic conduction during the phase evolution process led to excellent cycling stability and high rate performance. Consequently, the rocking-chair ZIB full battery system utilizing CuS@CTMAB and Zn 2+preintercalated MnO 2 as the anode and cathode, respectively, exhibits exceptional capacity retention of 93.9% up to 8000 cycles at 2 A g −1 . Besides, the CuS@CTMAB anode is also compatible with high-voltage Prussian blue cathodes, demonstrating its outstanding practicality.

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Section: Mechanism Investigationsupporting

confidence: 57%

“…Upon discharging, the peak intensity of CuS decreases gradually. Meanwhile, another prominent peak appears at ∼161.7 cm –1 and become stronger progressively at stage II, matching well with the Zn–S vibrations of ZnS . As the peak intensity of CuS recovers again during the charge process, the intensity of the ZnS drops.…”

Section: Resultsmentioning

confidence: 99%

Activating the Stepwise Intercalation–Conversion Reaction of Layered Copper Sulfide toward Extremely High Capacity Zinc-Metal-Free Anodes for Rocking-Chair Zinc-Ion Batteries

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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“…ZnS–BP has a similar peak shape and absorption edge to ZnS and ZnP 2 because of the similar scattering characteristics of S and P atoms; besides, owing to the high mass ratio of Zn/P (9:1), ZnS is still the main body of the ZnS–BP sample. However, from the enlarged view in the inset, we can infer that the absorption edge of Zn in the ZnS–BP sample is slightly left-shifted compared with that of ZnS and falls in between ZnS and ZnP 2 samples, indicating that a certain Zn–P bond exists in the ZnS–BP nanosheets. , …”

Section: Resultsmentioning

confidence: 92%

“…However, from the enlarged view in the inset, we can infer that the absorption edge of Zn in the ZnS−BP sample is slightly left-shifted compared with that of ZnS and falls in between ZnS and ZnP 2 samples, indicating that a certain Zn−P bond exists in the ZnS−BP nanosheets. 31,32 To more clearly and in-depth understand the formation of the Zn−P bond, Raman spectra were measured and are given in Figure 3, as illustrated in Figure 3b; hexagonal ZnS reveals three characteristic peaks at 273.5, 343.0, and 426.4 cm −1 , corresponding to transverse optical (TO), longitudinal optical (LO), and LO + transverse acoustic (TA) modes, respectively. 33 No obvious signal peaks of BP can be seen owing to its low content in the ZnS−BP sample.…”

Section: Resultsmentioning

confidence: 99%

Anchoring Black Phosphorus Nanoparticles onto ZnS Porous Nanosheets: Efficient Photocatalyst Design and Charge Carrier Dynamics

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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Black phosphorus nanoparticles (BP NPs) possess great advantages in photocatalysis owing to the rich surface active sites, extremely high carrier mobility, and strong visible–near-infrared light response. However, the complex preparation process, poor stability, and rapid carrier recombination restrict their successful application in photocatalysis. Herein, the above problems are resolved by preparing BP NPs through a facile sonication-assisted hydrothermal method. To further improve the stability and photocatalytic activity, BP NPs are tightly anchored onto ZnS to prepare ZnS–BP porous nanosheets. With the Zn–P coordination bond built between them, higher stability, enhanced carrier transport ability, and excellent hydrogen adsorption and desorption equilibrium of photocatalysts are achieved. An efficient and recyclable photocatalytic hydrogen evolution rate of 1561 μmol h–1 g–1 is obtained under visible-light irradiation, which is superior to that of previously reported BP-based photocatalysts. Besides, the photocatalytic mechanism is investigated based on the theoretical calculations and experimental characterizations. The charge transfer dynamics are studied by surface photovoltage (SPV), ultrafast transient absorption (TA), X-ray absorption spectra (XAS), electrochemical impedance spectroscopy (EIS), and steady-state photoluminescence (PL) spectra. This work set a reference for the design of high-performance BP-related nanomaterials in solar energy storage and conversion.

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Synthesis and Functionalization of Magnetic and Semiconducting Nanoparticles for Catalysis

Rawat

Kumari

Singh

2021

Functionalized Nanomaterials for Catalytic Application

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Structural, luminescent and antimicrobial properties of ZnS and CdSe/ZnS quantum dot structures originated by precursors

Cited by 12 publications

References 31 publications

Activating the Stepwise Intercalation–Conversion Reaction of Layered Copper Sulfide toward Extremely High Capacity Zinc-Metal-Free Anodes for Rocking-Chair Zinc-Ion Batteries

Activating the Stepwise Intercalation–Conversion Reaction of Layered Copper Sulfide toward Extremely High Capacity Zinc-Metal-Free Anodes for Rocking-Chair Zinc-Ion Batteries

Anchoring Black Phosphorus Nanoparticles onto ZnS Porous Nanosheets: Efficient Photocatalyst Design and Charge Carrier Dynamics

Synthesis and Functionalization of Magnetic and Semiconducting Nanoparticles for Catalysis

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