JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Chaoyu Li,Tengfei Xie,Huamin Kou,Yubai Pan,Jiang Li
Transparent Fe 2+ :ZnS polycrystals are 3–5 μm mid-IR laser gain materials with great importance. In this paper, a novel route combining wet-chemical co-precipitation, hot-pressed sintering and post hot isostatic pressing (HIP) treatment was proposed for Fe 2+ :ZnS transparent ceramics. Fe 2+ :ZnS powders were synthesized successfully by the wet-chemical co-precipitation method, which was suitable for particle size and morphology controlling and then ceramics consolidation. Transparent Fe 2+ :ZnS ceramics with comparatively high optical quality were successfully fabricated by two step sintering method combining hot pressing and post-HIP treatment. This approach is a promising candidate for fabricating Fe 2+ :ZnS ceramics with large size, low cost, short cycle, and flexible concentration distribution design.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2020
·Vol. 15
·期 9
·595-599
·
IF 0.975
Dezhi Qin,Guangrui Yang,Yabo Wang,Jiajia Zhang,Li Zhang
Pectin-conjugated CdS/ZnS core/shell nanocrystals were prepared by using a microwave-assisted approach without the addition of any external ligands. The prepared cubic phase CdS/ZnS nanocrystals were uniform and mono-dispersed with sizes of 6–9 nm. The charge and long-chain structure of pectin molecules effectively prevented the aggregation of CdS/ZnS nanocrystals. In addition, pectin molecules have multiple functional groups, such as O–H, C=O, and COO − , which could conjugate with the surface of samples to control the growth of CdS/ZnS nanocrystals. Thermogravimetric analysis provided evidence that the obtained products are inorganic–organic hybrid materials. Based on the analysis of ultraviolet–visible spectra, it was found that the formation of ZnS shell led to a red-shift and an enhancement of absorption of CdS/ZnS nanocrystals compared with that of CdS. Photocatalytic activity of CdS/ZnS nanocrystals was monitored by the degradation of Rhodamine B under visible light irradiation. The presence of ZnS shell inhibited photo-corrosion and photo-dissolution of CdS nanocatalyst, thus resulting in a significant enhancement of photocatalytic activity and stability.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Pan Li,Tao He
Inspired by the nature photosynthesis, fabrication of Z-scheme system is an effective strategy to enhance the photocatalytic activity, via which photogenerated electrons and holes that take part in the redox reactions can be separated spatially and temporally, while their strong redox capability can still be preserved. It is of great importance to construct good Z-scheme demo systems, and yet a considerable challenge to verify the charge transfer direction, which is vital for designing and fabricating the photocatalytic systems with high efficiency. Here ZnS@ZnO core-shell nanostructures were fabricated via simply annealing ZnS(en) 0.5 precursor, which exhibited superior activity for solar fuel production to ZnS. The Z-scheme mechanism was proposed based on the experimental results of charge transfer study. Direct intimate contact is formed at interface due to in-situ growth with common Zn cation. Specifically, ZnS X O 1–X and/or defects may be formed at the interface, which behave like a mediator in a Z-scheme system. All these account for the observed efficient separation of charge carriers and enhanced activity of photocatalytic reduction.
研究领域:
材料科学
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能源科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 42
·11266-11271
·
IF 5.976
Yong Xia,Guangmei Zhai,Zhi Zheng,Linyuan Lian,Huan Liu,Daoli Zhang,Jianbo Gao,Tianyou Zhai,Jianbing Zhang
Solar-blind deep ultraviolet (DUV) photodetectors (PDs) have promising applications in a variety of fields due to the zero background under sun or room illumination. As almost all solar-blind DUV PDs are fabricated based on materials prepared by expensive high temperature and vacuum methods, therefore, solution processed devices are highly desirable for large area, flexible and arrayed applications. Here, we demonstrated that solar-blind DUV PDs can be fabricated using colloidal ZnS quantum dots (QDs). In order to synthesize ZnS QDs with a bandgap in the solar-blind region, a new synthesis was developed. The new method produced monodispersed and strongly quantum confined ZnS QDs with an exciton peak at 265 nm. Solar-blind DUV PDs were fabricated via spin coating and ligand exchange. The ZnS QD solar-blind DUV PDs showed a fast response (Tr = 0.35 s, Td = 0.07 s) and good responsivity (∼0.1 mA W−1) and the performance was comparable to other solar-blind DUV PDs based on some traditional wide bandgap semiconductor materials. The response of the ZnS QD PDs was found to be dominated by the drift of the photogenerated carriers, as the ZnS QD thin film was insensitive to their surface states.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 48
·25183-25188
·
IF 3.708
Meihua Wang,Weifen Niu,Xin Wu,Lixia Li,Jun Yang,Shaomin Shuang,Chuan Dong
3-Mercaptopropionic acid (MPA)-capped ZnS:Cu/ZnS core/shell quantum dots (QDs) have been synthesized via a facile aqueous coprecipitation method and characterized by fluorescence, UV-Vis absorption, infrared spectroscopy and transmission electron microscopy. The fluorescence of ZnS:Cu/ZnS could be increased in the presence of uric acid (UA). The affecting factors for the fluorescence of ZnS:Cu/ZnS were examined including pH, temperature and reacting time. Under the optimized conditions, the fluorescence intensity of the ZnS:Cu/ZnS QDs against the UA concentration showed a linear response in the range of 0.66 μM to 3.3 μM with the correlation coefficient (R2) 0.9973 and the limit of detection 0.044 μM. Most relevant molecules and physiological ions had no effect on the detection of UA. The feasibility of the developed method was further demonstrated by determining the concentration of uric acid in human urine samples and the recoveries were 95% ∼ 103%. Our work provides a sensitive, selective and convenient fluorescence method to determine UA in real samples.
研究领域:
分析化学
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纳米医学
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生物传感器
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临床检验
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分子诊断
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2018
·
IF 6.036
Xin Liang,Lei Shen
Grain boundary plays an important role in energy carrier transport. By choosing ZnO as a model system of technological importance, and by measuring the thermal and electrical transport properties of ZnO polycrystals with a wide range of grain boundary spacing, we determine the interfacial thermal (Kapitza) resistance of the ZnO grain boundary R k = 4.0 ± 0.7 × 10 − 9 m 2 K W −1 , which is relatively independent of grain size . The effective electron potential barrier height and the depletion width of the grain boundary generally increase with spacing, but they collapse below ∼100 nm and become almost invariant above ∼1 μm. When the grain boundary is locally modified by nanometer-thick ZnS thin film , the Kapitza resistance increases by more than three times, up to about 12.9 × 10 − 9 m 2 K W −1 , and the depletion region expands more than twice. The charge carrier concentration is influenced by the effective potential barrier height due to the grain boundary energy filtering effect whereas the electron mobility is related to the depletion width. Our investigations demonstrate the significance of grain boundary characteristics for interfacial and effective bulk transport properties. The findings and the approach are broadly important for polycrystalline materials of which the functional performance can be adjusted via grain boundary engineering.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2021
·Vol. 16
·期 10
·500-505
·
IF 1.102
Dejuan Fa,Yuqing Miao
By hydrothermal reaction, the hydrangea-like ZnS/ZnIn 2 S 4 microspheres were prepared in the presence of thioacetamide. X-ray photoelectron spectroscopy and high resolution transmission electron microscopy confirmed that the ultra-long nanowires are composed of ZnS and ZnIn 2 S 4 . Scanning electron microscopy showed the morphology of ultra-thin nanosheets with an average thickness of 8.5 nm cross from inside to outside, forming ZnS/ZnIn 2 S 4 microspheres with a porous diameter of about 2.8 μm. Nitrogen adsorption desorption isotherm determined that the BET specific surface area of the microspheres was 109.19 m 2 /g which showed that they have a large specific surface area. The obtained ZnS/ZnIn 2 S 4 microspheres showed broad absorbance ranging from UV (200 nm) to visible (520 nm) with low indirect band gaps of 2.08 eV. It leads to outstanding visible-light-driven photocatalysis for the degradation of xylenol orange (XO) and thymol blue (TB) in water, and the two dyes were almost completely degraded after 60 and 135 min, respectively. This provides new potential to explore nanomaterials for efficient photo-driven degradation of organic dyes under visible light irradiation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2014
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IF 5.825
Chaoying Xu,Ronghui Zhou,Wenwei He,Lan Wu,Peng Wu,Xiandeng Hou
Fingerprints are unique characteristics of an individual, and their imaging and recognition is a top-priority task in forensic science. Fast LFP (latent fingerprint) acquirement can greatly help policemen in screening the potential criminal scenes and capturing fingerprint clues. Of the two major latent fingerprints (LFP), eccrine is expected to be more representative than sebaceous in LFP identification. Here we explored the heavy metal-free Mn-doped ZnS quantum dots (QDs) as a new imaging moiety for eccrine LFPs. To study the effects of different ligands on the LFP image quality, we prepared Mn-doped ZnS QDs with various surface-capping ligands using QDs synthesized in high-temperature organic media as starting material. The orange fluorescence emission from Mn-doped ZnS QDs clearly revealed the optical images of eccrine LFPs. Interestingly, N-acetyl-cysteine-capped Mn-doped ZnS QDs could stain the eccrine LFPs in as fast as 5 s. Meanwhile, the levels 2 and 3 substructures of the fingerprints could also be simultaneously and clearly identified. While in the absence of QDs or without rubbing and stamping the finger onto foil, no fluorescent fingerprint images could be visualized. Besides fresh fingerprint, aged (5, 10, and 50 days), incomplete eccrine LFPs could also be successfully stained with N-acetyl-cysteine-capped Mn-doped ZnS QDs, demonstrating the analytical potential of this method in real world applications. The method was also robust for imaging of eccrine LFPs on a series of nonporous surfaces, such as aluminum foil, compact discs, glass, and black plastic bags.
研究领域:
法医学
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材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12227-12234
·
IF 2.7
Yi Zheng,Qiaoling Chen,Wenjing Zhang,Chongwen Zhang,Rong Ma,Chunlei Li,Jing Zhang
The photocatalytic hydrogen evolution half-reaction (HER) is a promising technology for meeting future energy demands. An excellent photocarrier separation is essential for the HER. Here, a CdS/ZnS composite (CZS) with a dual photocarrier separation channel has been synthesized using the epitaxial growth method to achieve this aim. XRD and TEM show that pre-adsorption of S2− on the CdS surface facilitates the conversion of CdS into ZnS with a larger solubility product, implying a good carrier transport channel between CdS and ZnS. Based on XPS, PL, and photo-deposition experiments, a dual-channel photocarrier separation mechanism has been proposed, which is the source of the great photocarrier separation, and thus the hydrogen evolution rate of the CZS-2 sample (22.05 mmol g−1 h−1) becomes 18.5 and 73.5 times higher than those of CdS and ZnS. The apparent quantum yield (AQY) of CZS-2 at 420 nm is 4.68%.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7279-7287
·
IF 6.641
Tong Yan,Yunyan Li,Xiaoxiao Song,Jie Wang,Zhuoying Xie,Dawei Deng
The cytotoxicities of the elements of current quantum dots (QDs) greatly restrict their applications in biomedical fields. Herein, we firstly proposed and synthesized oil-soluble heavier-element-free (or Cd-free) CuFeS2/ZnS QDs, and focused on the synthetic controls over the core/shell structure. It was found that although the as-prepared CuFeS2 QDs are nonemissive, the in situ ZnS-overcoating could make them exhibit bright near-infrared (NIR) photoluminescence (PL) (PL peak at 840 nm; PL quantum yield (QY) up to 52%). We also analyzed their shape, structure and elemental composition in detail. Next, by the interaction between oil-soluble QDs and liposomes, the aqueous QD-laden liposomes (named as LipQDs) were fabricated, allowing further exploration of bio-application. Finally, after further decorating with isolated macrophage membrane, the resulting LipQDs@M nanocomposites were observed to target actively postoperative tumor inflamed tissue (or other inflamed tissues), using an in vivo small animal IR optical imaging system. Our results indicate that these NIR-emitting CuFeS2/ZnS QDs should be a new promising fluorescent marker for biomedical optical imaging, as an alternative for Cd-, Hg-, and Pb-based ones.
研究领域:
生物医学工程
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材料科学
·
光学成像
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 42
·期 21
·7724-7730
·
IF 3.806
Tingting You,Junli Wang,Hui Feng,Kangmin Chen,Weiling Fan,Chi Zhang,Runsheng Miao
Template growth and catalytic growth are two typical mechanisms for the solution-chemistry synthesis of one-dimensional (1D) II–VI semiconductor nanomaterials. Here, we systematically demonstrate the competition relationship between them by tuning the synthesis of 1D ZnS nanostructures in different chain-length primary alkyl-amines. The template growth, derived from the coordination effect of amines, produces ZnS nanobelts and will compete with the Ag2S-catalyzed mechanism as AgNO3 is added into these amines. In short-chain n-propylamine and n-butylamine the template growth is much stronger than the catalytic growth, leading to the morphology maintenance of ZnS nanobelts, whereas the latter replaces the former in long-chain n-octylamine and n-dodecylamine due to the decrease of coordination ability of amines, which yields ZnS nanowires instead of nanobelts. A balance of competition is built between these two mechanisms in middle-length n-hexylamine, producing a mixture of ZnS nanobelts and nanowires. The morphology and growth mechanism changes of ZnS nanostructures have been rationally investigated using various characterization techniques. Meanwhile, the optical properties of the products synthesized before and after adding AgNO3 are comparatively studied by UV-vis absorption and photoluminescence (PL) spectra.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qianqian Li,Fan Li,Peng Li,Shuguo Yu
This work prepared ZnS, SnO 2 , and zinc oxide/tin dioxide (ZnS/SnO 2 ) composite materials by the hydrothermal method, and systematically studied their physicochemical properties. Humidity sensors were constructed based on these materials, and their humidity-sensing performances were tested. The characterization results show that ZnS has a cubic sphalerite structure, SnO 2 has an orthorhombic rutile structure, and the surface of ZnS/SnO 2 composites is rich in hydrophilic functional groups such as hydroxyl groups (-OH) and high-density oxygen vacancy defects. The results of the humidity-sensitive performance study showed that the ZnS/SnO 2 composites prepared under specific conditions exhibited good humidity-sensitive properties. These conditions include a molar ratio of ZnS to SnO 2 of 1:15, a reaction time of 12 h, and a reaction temperature of 200°C. The ZnS/SnO 2 humidity sensor, designed according to these optimized parameters, exhibits excellent performance at room temperature. It has an extremely high response of 2.14 × 10 6 %, a minimum hysteresis of 2.4 %, excellent linearity, and fast response and recovery times of 9.7 s and 38.6 s, respectively, over a humidity range of 11 % RH to 95 % RH. The successful fabrication of the ZnS/SnO 2 humidity sensor not only demonstrates its superior performance but also provides valuable insights into the design of high-performance sensors.
研究领域:
材料科学
·
纳米技术
·
传感器
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）