MATERIALS RESEARCH BULLETIN
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2014
·
IF 1.968
Xin Zhou,Xianghua Zeng,Xiaoqing Yan,Weiwei Xia,Yuxue Zhou,Xiaoshuang Shen
Single-crystalline ZnS nanoparticles with a zinc-blende crystal structure have some microdefects such as stacking faults and nanotwins. In contrast, ZnS nanorods have a wurtzite crystal structure, which grows along the [0 0 0 1] direction, although some nanorods display the intergrowth of a minor zinc-blende phase and the major wurtzite phase, which forms stacking faults or zinc-blende/wurtzite ZnS nanotwins. Raman spectroscopy measurements reveal surface phonons and longitudinal optical phonons in the nanoparticles, nanorods and doublet phonons that are associated with the transversal optical phonons of the A1 and E1 modes in only the nanorods. The first-order longitudinal optical phonon mode exhibits a blueshift of 6 cm −1 when the particle size increases from 5 to 15 nm, but there is no shift in the range of 15–30 nm because of quantum confinement and microdefects.
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MACROMOLECULES
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2015
·
IF 5.8
Mingli Ni,Haiyan Peng,Yonggui Liao,Zhifang Yang,Zhigang Xue,Xiaolin Xie
We synthesize zinc sulfide (ZnS) nanoparticles with a diameter of ∼5 nm and formulate novel photopolymer/ZnS nanocomposites for holographic recording. By taking advantage of the photoinitibitor, composed of 3,3′-carbonylbis(7-diethylaminocoumarin) (KCD) and N-phenylglycine (NPG), with a capability of spatiotemporally tailoring the grating formation process, we successfully achieve high performance holographic photopolymer/ZnS nanocomposites with as high as 93.6% of diffraction efficiency (η), 26.6 × 10–3 of refractive index modulation (n1), 8.4 per 200 μm of dynamic range, and 9.8 cm/mJ of photosensitivity. In addition, for an aim of roughly describing the grating formation process, we establish a novel exponential correlation between the ZnS nanoparticles segregation degree (SD) and the ratio of photopolymerization gelation time (tgel) to holographic mixture viscosity (v). Finally, we reconstruct and display 3D images that are clearly identifiable to the naked eye through a master technique, opening a versatile class of potential applications in high capacity data storage, stereoadvertisements, and anticounterfeiting.
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Analytical Methods
·
2013
·Vol. 5
·期 21
·6094-6099
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IF 1.855
Jing Ma,Fang Wang,Meng Fan,Tianyi Wang,Wei Bian,Shaomin Shuang
The room temperature phosphorescence (RTP) of quantum dots (QDs) offers many advantages compared with fluorescence, such as a longer emission lifetime, wider gap between excitation and emission spectra and minimal interference. Hence, the RTP properties of QDs and their potential for phosphorescence detection have drawn more and more attention. In this paper, N-acetyl-L-cysteine (NAC)-capped Mn-doped ZnS QDs were synthesized by a hydrothermal method. The QDs displayed a strong phosphorescence emission peak at 590 nm upon excitation at 315 nm. Because their RTP was efficiently quenched by hydrochlorothiazide (HCT), a novel RTP method for determination of HCT was developed. The results showed that under the optimized conditions, the changes of RTP intensity showed a good linear relationship with the concentration of HCT in the range of 2.5 to 95 μM, with a limit of detection of 1.25 μM and relative standard deviation of 0.44%. The related theories preliminarily demonstrated the dynamic quenching mechanism. In addition, this method was successfully applied to the analysis of practical samples. The recovery of spiked solutions ranged from 94–104%.
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RSC Advances
·
2015
·Vol. 5
·期 33
·25830-25839
·
IF 3.84
Yiru Jia,Yun Yu,Xinjian Cheng,Xiao Zhao,Shengwei Ma,Honghui Huang
A facile method for the preparation of flexible semiconductor/polymer composite films with a CdS and ZnS particle layer on their surface has been developed. The as-prepared composite films were used as building blocks to fabricate a photo-catalytic cell. Methyl methacrylate (MMA) and butyl methacrylate (BMA) were copolymerized via free radical polymerization. BMA was used to tune the flexibility of the films. Allyl methyl sulfide (AMS) and N-allylmethylamine (AMA) were used as functional monomers to coordinate with Cd2+/Zn2+ ions. Cd2+/Zn2+ ions were chemically bonded to the PMMA-BMA-AMS (PMBS) or PMMA-BMA-AMA (PMBA) films. By addition of a thioacetamide (TAA) solution, S2− ions were gradually released and combined with Cd2+/Zn2+ ions to form CdS/ZnS particles. Accordingly, CdS/PMBA, ZnS/PMBA, CdS/PMBS and ZnS/PMBS films were prepared. The composite films were characterized and used to fabricate a photo-catalytic cell. The well-designed cell showed excellent performance in the degradation of the pollutant methyl blue (MB). Also, this cell could be used repeatedly just by rinsing with water after use.
研究领域:
材料科学
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环境科学
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2012
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IF 5.625
Man Luo,Yong Liu,Juncheng Hu,Jinlin Li,Jun Liu,Ryan M. Richards
A gas bubble-templating method has enabled synthesis of a diverse portfolio of hollow transition-metal sulfides microspheres (e.g., CdS, ZnS, CuS and Bi 2 S 3 ) by a general one-step route. The products were characterized by X-ray powder diffraction, scanning and transmission electron microscopy, high-resolution transmission electron microscopy, energy dispersive spectroscopy analysis, N 2 adsorption and UV–vis diffuse reflectance spectroscopy. The shell of all hollow spheres is composed of single-crystal metal sulfide nanoparticles and the shell thickness can be readily controlled by changing the deposition time. These hollow microspheres are envisioned to have broad applications in catalysis, Li-ion batteries, microreactors, biomedicines, etc. As an example, here, we demonstrate that the prepared CdS and ZnS hollow sub-micrometer spheres are excellent photocatalysts with higher photodegradation efficiency of potential polluting agents than that of commercial CdS, ZnS and TiO 2 P25 under visible light and UV light illumination, respectively.
研究领域:
材料科学
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化学工程
·
环境科学
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lei Ming,Yun Yu,Shaojun Fang,Zhiming Xiao,Xing Ou
Transition metal dichalcogenides exhibit tremendous potential for sodium ion batteries (SIBs), owing to the outstanding specific capacity and aboundant reserves. However, the large ionic radius of sodium and poor conductivity often result in the fast decaying performance and inferior reaction kinetics. Herein, the GeS 2 /GeO 2 /ZnS@rGO (GGZ/C) ternary metal-based composite is fabricated as an anode material for SIBs. Notably, the GGZ/C composite is derived from the phase transformation of Zn 2 GeO 4 precursor, which is beneficial for the heterostructure engineering. In this hierarchical structure, the metal phases ZnS and GeO 2 are used to form the heterogeneous framework, while graphene is applied to build a conductive network and anchor the host nanoparticles . Therefore, the great Na + diffusion channels are achieved by the rational design of the huge exquisite interfaces among the heterogeneous mixed phases. Notably, it can almost completely relieve the volume expansion and restrain the internal stress of GGZ/C composite, providing the excellent structural tolerance. As expected, the GGZ/C composite exhibits excellent rate capability, with an impressive reversible capacity of 548 mAh g −1 at a high rate of 5.0 A g −1 . Meanwhile, the GGZ/C also displays outstanding cycling performance with a specific capacity of 519 mAh g −1 after 650 cycles at high rate of 5.0 A g −1 . This strategy offers the inspiration for rational heterostructure engineering for the energy storage materials with excellent reversible capacity and large volume variation.
研究领域:
材料科学
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储能
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电化学
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纳米材料
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OPTICAL MATERIALS
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2015
·
IF 1.981
Jingwei Ma,Mingming Liu,Zhichun Li,Liang Li
CuInS 2 quantum dots are considered near-ideal fluorophores based on their bright emission and low toxicity. However, CuInS 2 quantum dots are still bothered by their sensitivity to surface chemistry and chemical environment. Traditionally, the CIS QDs require an additional coating process to be encapsulated inside silica sphere or organic polymer. Up till now, few works have been made concerning improving the intrinsic stability of CIS QDs . In an effort to improve the stability of CuInS 2 quantum dots, we came up with a new method by increasing the ZnS shell thickness. These QDs were characterized by photoluminescence, HRTEM, XRD and XRF analysis. We investigated the influence of ZnS shell thickness on the ambient stability of CIS/ZnS QDs. The results demonstrated that a thicker ZnS shell helped significantly improve both photostability and chemical stability of the QDs. Finally, the thick shell QDs were dispersed into transparent polymer matrix and fabricated into a LED device, which also gave much more stability compared with conventional QDs.
研究领域:
纳米材料
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光物理
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光电子学
·
材料科学
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ACS Nano
·
2026
·
IF 17.3
Xiangda Deng,Wenxin Yang,Tianmin Wu
CuInS2 quantum dots (CIS QDs), with tunable photoluminescence spanning from the visible to near-infrared (NIR) region, hold significant potential for consumer electronics and bioimaging due to their favorable photophysical properties and absence of toxic elements. However, their intrinsic lack of short-wavelength emission has hindered their use in white light-emitting applications. Herein, we report a facile synthesis of zinc–acetate–oleylamine (Zn–Ac–OAm) and oleylamine (OAm)-coencapsulated CIS/ZnS QDs that deliver full-spectrum sunlight-like emissions, characterized by a distinct 455 nm peak and an ultrabroad full width at half-maximum (fwhm) of 241 nm. The Zn–Ac–OAm emitter produces blue-green fluorescence, effectively compensating for the short-wavelength deficiency of the CIS/ZnS QDs. More importantly, strong interactions between Zn–Ac–OAm and CIS/ZnS QDs enable efficient energy transfer within coencapsulated structures. As a proof of concept, white light-emitting diodes (WLEDs) fabricated using these coencapsulated CIS/ZnS QDs exhibit excellent photophysical performance, achieving a high color rendering index (CRI) of 92.1 and external quantum efficiency (EQE) of 7.2%. This coencapsulation strategy, together with the elucidated photophysical mechanisms, provides viable pathways for extending the application of long-wavelength-emitting nanomaterials in next-generation lighting and display technologies.
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高影响因子
Materials
·
2023
·Vol. 16
·期 21
·7007
·
IF 3.4
Yuzhe Wang,Yueqi Zhong,Jiangzhi Zi,Zichao Lian
Conventional single-component quantum dots (QDs) suffer from low recombination rates of photogenerated electrons and holes, which hinders their ability to meet the requirements for LED and laser applications. Therefore, it is urgent to design multicomponent heterojunction nanocrystals with these properties. Herein, we used CdSe quantum dot nanocrystals as a typical model, which were synthesized by means of a colloidal chemistry method at high temperatures. Then, CdS with a wide band gap was used to encapsulate the CdSe QDs, forming a CdSe@CdS core@shell heterojunction. Finally, the CdSe@CdS core@shell was modified through the growth of the ZnS shell to obtain CdSe@CdS@ZnS heterojunction nanocrystal hybrids. The morphologies, phases, structures and performance characteristics of CdSe@CdS@ZnS were evaluated using various analytical techniques, including transmission electron microscopy, X-ray diffraction, UV-vis absorption spectroscopy, fluorescence spectroscopy and time-resolved transient photoluminescence spectroscopy. The results show that the energy band structure is transformed from type II to type I after the ZnS growth. The photoluminescence lifetime increases from 41.4 ns to 88.8 ns and the photoluminescence quantum efficiency reaches 17.05% compared with that of pristine CdSe QDs. This paper provides a fundamental study and a new route for studying light-emitting devices and biological imaging based on multicomponent QDs.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Yuxin Liang,Zhihong Li,Yumei Zhu
Glass-ceramic bond diamond composites with added metallic compounds as reinforcement are generally used to manufacture super-hard grinding tools. The objective of this study was to evaluate the relationship between ZnS and glass-ceramic bond diamond composites and to elaborate on the appropriate ZnS content. Results showed that the physical, thermal and mechanical properties of glass-ceramic bond diamond composites improved with the addition of ZnS. The microstructure presented regular β-Spodumene crystal distribution in the composites. Furthermore, ZnS destroyed the glass network structure, which provided sufficient space for the crystallization of β-Spodumene, with the generation of Zn 2 SiO 4 decreased crystallization temperature. The optimal content of ZnS was 6 wt%, producing 76.52 MPa bending strength , 3.44 × 10 −6 °C −1 CTE and 16% porosity, whereas, excessive ZnS decreased composite properties.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3843-3850
·
IF 2.047
Wang Q. Y.,Wu Z. F.,Zhang M.,Qin Z. J.,Wang L.,Zhong F. R.,Duan H. M.
To realize the resource utilization of waste mask fibers (MF), a layer of ZnS nanoparticles was grown on MF by a one-step hydrothermal method, and a MF/ZnS sensor was successfully prepared. This is the first time that resource utilization of MF has been combined with the development of a high-performance gas sensor. The MF/ZnS sensor showed high sensitivity and recoverability to target vapors at room temperature. Compared with ZnS powder loaded on a ceramic substrate, the MF/ZnS composite responses to four analytes have been improved by 8.4~35.2 times. In addition, the time for the MF/ZnS sensor to complete one response–recovery cycle for all four analytes was less than 30 s. This should be attributed to the high gas permeability of the MF substrate, which made the ZnS particles loaded on the MF more fully exposed to contact with the target vapors. This work not only provides a simple and low-cost method to optimize the sensing performance of gas sensors but also provides a new way for the resource utilization of MF. Graphic Abstract
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2021
·
IF 3.382
Yu Hao,Peng Li,Baohua Zhu,Yimin Zhang,Yuzong Gu
In order to modulate the nonlinear optical (NLO) properties of multi walled carbon nanotubes (MWCNTs) and make them applicable to ultrafast nonlinear optical devices, we fabricated a core satellite ZnS-Au nanostructure on the surface of MWCNTs via the solvothermal method. The structure and morphology of the MWCNTs-Au-ZnS product were characterized by means of the XRD, SEM and XPS, which showed that the ZnS-Au nanoassemblies were combined along with the MWCNTs through C S covalent bond and partial ionic bond. The optical nonlinearities of the MWCNTs-Au-ZnS system were investigated using the Z-scan technique under the excitation of 532 nm ps laser pulses and kinetically analyzed using the pump-probe transient absorption spectroscopy. The results showed that the saturation absorption (SA) coefficient and the third-order nonlinear susceptibility of the MWCNTs-Au-ZnS system were adjustable with the variation of the core-satellite structure. The intensity of the saturation absorption was tuned downward below that of the pure MWCNTs, while the susceptibility of the system was tuned upward above that of the pure MWCNTs, which were attributed to the combined action of two-photon absorption of ZnS, charge transfer in the system, trap states provided by Au and charge delocalization varying with the size. These tunable nonlinearities will expand the applications of the MWCNTs-Au-ZnS system in photonic devices.
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