CRYSTENGCOMM
·
2012
·Vol. 14
·期 19
·6295-6305
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IF 3.842
Wei Chen,Hong Ruan,Yin Hu,Danzhen Li,Zhixin Chen,Jiangjun Xian,Jing Chen,Xianzhi Fu,Yu Shao,Yi Zheng
We report here a facile one-step strategy to prepare hollow ZnO core/ZnS shell structures by microwave irradiation. The growth mechanism of the hollow core/shell structures was investigated in detail. ZnO truncated hexagonal pyramids first form on as-grown precursor flakes and then evolve into ZnO hexagonal twin crystals, which subsequently grow up and dissolve internally. The hollowing progress is firstly controlled by the Kirkendall effect and then undergoes an Ostwald ripening process. Hollow structures and the formation of ZnO/ZnS heterostructure bring enhanced photocatalytic activities to ZnO core/ZnS shell structures. The formed ZnO/ZnS heterostructures also fill the surface defects of ZnO crystals and improve the stability of the photocatalysts by overcoming the photocorrosion effect of a single ZnO photocatalyst under UV light irradiation. Superoxide radicals (O˙−2) are the key active species in the photocatalytic system of degradation of p-chlorophenol over hollow ZnO core/ZnS shell structures. The photocatalysis process has been discussed and a possible mechanism also has been proposed. This work is helpful to controllably construct other hollow core/shell structures, develop ZnO-based photocatalysts without photocorrosion effect and further study the photocatalytic mechanism of similar systems.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhenlu Liu,Jing Xu,Caijin Xiang,Ye Liu,Lijun Ma,Linying Hu
Semiconductor materials can absorb visible light to become excellent hydrogen-producing materials. When different semiconductors are supported on each other, it can greatly promote the increase of hydrogen production rate. The article uses ZnS and CoMoO 4 to construct a new type of S-scheme heterojunction, and uses related characterization to illustrate the hydrogen production advantages and high performance reasons of the system. The experimental data of photocatalytic hydrogen production concretely proved the high catalytic performance of the composite material. The results shown that when the amount of ZnS loaded on CoMoO 4 was 5%, the adsorption of the composite catalyst and an appropriate amount of sensitizer made the hydrogen production rate reached 1233 μmol/g/h. This study used different characterizations to show the ball-and-stick structure of the composite catalyst and supplements the S-scheme heterojunction mechanism. Based on various studies, ZnS and CoMoO 4 had broad application prospects. The special electron transfer path of the S-scheme heterojunction provided theoretical model support for high-performance hydrogen production.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2015
·Vol. 25
·期 4
·897-905
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IF 1.927
Li Li,Zhang Qiaolin,Ding Yaping,Lu Yaxiang,Cai Xiaoyong,Yu Lurong
Based on the quenching of the fluorescence intensity of thioglycolic acid (TGA)-capped core-shell CdTe/ZnS nanoparticles (NPs) by vanillin, a novel, simple and rapid method for the determination of vanillin was proposed. In aqueous medium, the functionalized core-shell CdTe/ZnS NPs were successfully synthesized with TGA as the capping ligand. TGA-capped core-shell CdTe/ZnS NPs were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. Factors affecting the vanillin detection were investigated, and the optimum conditions were also determined. Under the optimum conditions, the relative fluorescence intensity of CdTe/ZnS NPs was linearly proportional to vanillin over a concentration range from 9.4 × 10 −7 to 5.2 × 10 −4 M with a correlation coefficient of 0.998 and a detection limit of 2.6 × 10 −7 M. The proposed method was also employed to detect trace vanillin in cookies with satisfactory results.
研究领域:
分析化学
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纳米技术
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食品科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Zexun Cui,Pingping Zhang,Weixin Li,Pengyu Zhou,Yu Zhang,Bao Liu,Yuqiang Li
All-inorganic perovskite CsPbX3 (X = Cl, Br, or I) and related materials have shown great potential for applications in solar cells, light-emitting diodes, and photodetectors. A kind of heterostructure was proposed comprising CsPbBr3/ZnS nanocrystals in order to enhance the luminescence properties of CsPbBr3 nanocrystals. The incorporation of ZnS induces recombination at the interface, facilitating charge transfer and the formation of a type-II heterostructure. The luminescence characteristics of this heterostructure can be modulated by applying pressure. The photoluminescence intensity of the CsPbBr3/ZnS nanocrystals is significantly enhanced up to 0.29 GPa. With further pressure increase, these nanocrystals exhibit a red shift in emission wavelength, resulting in a high sensitivity (dλ/dP) of 9.59 nm GPa–1 and an absolute sensitivity (dFWHM/dP) of 6.07 nm GPa–1. Photoluminescence quenching occurs until the completely undetectable emission at a pressure of 2.38 GPa. The observed anomalous enhancement and wavelength red shift indicate that pressure can promote the transition from free excitons to self-trapping excitons, leading to energy transfer between ZnS and CsPbBr3. This study enhances the understanding effect of high pressure on luminescent materials in heterostructures.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Liping Zhao,Anqi Wang,Ailin Yang,Guihong Zuo,Jun Dai,Youjin Zheng
Exploring electrocatalysts with low cost and excellent performance for oxygen reduction reaction is still a significant challenge. In this paper, we introduce a novel strategy to fabricate ZnS, Fe, and P co-doped N enriched carbon (ZnFeSP/NC) via the direct carbonization of PVP/ZIF-8 combined with absorption, sulphurization , and phosphorization processes. The as-synthesized ZnFeSP/NC was used as electrocatalyst for oxygen reduction reaction (ORR). We explored the influence of Fe, S, and P elements on the ORR activity of the catalysts. It can be found that ZnS nanoparticles were formed and attached on the surface of the ZnFeSP/NC nanoparticles. α-Fe and P element were well dispersed on ZnFeSP/NC nanoparticles. Fe, S, and P element can highly enhance the ORR activity of the catalysts. Compared to Zn/NC, ZnFe/NC, and ZnFeS/CN, ZnFeSP/NC shows the optimal ORR performance with the half-wave potential of 0.859 V and a current density of 3.33 mA cm −2 at −0.85 V. Furthermore, ZnFeSP/NC also exhibits excellent long-term operation stability, effectively avoiding any ORR performance decay.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2023
·Vol. 154
·期 6
·2527-2536
·
IF 2.8
Song Xiao-jie,Wang Xiu-fang,Wang Meng,Dong Wei-wei,Li Ming-ming,Yang Fan
The photocatalytic hydrogen (H 2 ) evolution process under solar-light irradiation is a crucial fundamental step for solar energy exploitation. In our study, the ZnS/reduced graphene oxide (ZnS/rGO) composites were prepared using a simple solvothermal approach. The combination of detailed theoretical simulation calculations and comprehensive characterizations indicates that the rGO can greatly increase the capture of light, reduce the band gap, accelerate the transfer of photogenerated electrons, and provide more photo-induced carriers to participate in photocatalytic reactions. The as-formed optimized ZnS/rGO composites exhibit a remarkably superior photocatalytic H 2 production capacity of 0.30 mmol/g/h, up to 4.29 times over bare ZnS nanoparticles. The enhanced photocatalytic H 2 evolution performance of the ZnS/rGO composites was ascribed to the intimated hetero-interface between components and the efficient transfer of photo-generated electrons from ZnS to rGO. This work provides new insights into the semiconductor-graphene heterojunction photocatalyst for enhancing photocatalytic activity. Graphical
研究领域:
材料科学
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纳米技术
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能量转换
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催化
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可再生能源
✓ 已验证
DOI
高影响因子
ACS Sensors
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2020
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IF 7.333
Sheng Xue,Xiao-Fang Jiang,Geng Zhang,Haiyan Wang,Zongbao Li,Xiaowen Hu,Mingyu Chen,Tianci Wang,Aiping Luo,Ho-pui Ho,Sailing He,Xiaobo Xing
For the first time, a reproducible surface plasmon-enhanced optical sensor for the detection of gaseous formaldehyde was proposed, which was fabricated by depositing a mixture of CdSe@ZnS quantum dots (QDs), fumed silica (FS), and gold nanoparticles (GNs) on the surface of a silica sphere array to meet the urgent requirement of a rapid, sensitive, and highly convenient formaldehyde detection method. Because of the spectral overlap between QDs and GNs, plasmon-enhanced fluorescence was observed in the film of QDs/FS/GNs. When exposed to formaldehyde molecules, the enhanced fluorescence was quenched linearly with the increase of formaldehyde concentration in the range of 0.5–2.0 ppm. The reason is attributed to the nonradiative electron transfer from QDs to the carbonyl of formaldehyde molecules with the assistance of amino groups. Our results demonstrate that the designed sensors are capable of detecting ultralow concentration gaseous formaldehyde at room temperature with a fast response–recovery time and excellent selectivity, stability, and reproducibility. This work provides a simple and low-cost approach for optical formaldehyde sensor fabrication and shows promising applications in environmental detection.
研究领域:
材料科学
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环境科学
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光学传感
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 9
·3060-3066
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IF 2.787
Chaoyu Li,Yubai Pan,Huamin Kou,Haohong Chen,Wei Wang,Tengfei Xie,Jiang Li
In this study, transparent ZnS ceramics were hot pressed from precipitated wurtzite nanopowders. Influences of sintering temperature on wurtzite-to-sphalerite phase transition and densification behavior have been investigated. Maximum sphalerite phase content and highest densification were simultaneously obtained in the sample hot pressed at 900°C with uniaxial pressure of 250 MPa for 2 h, which accounts for the highest transmittance above 55% and 70% in the range 2–5 μm and 5–13 μm, respectively. Preferred orientation of wurtzite grains in [002] direction paralleled to the press direction was also observed, which is supposed to be benefit to transmittance by reducing birefraction and second-phase scattering. Furthermore, second-phase scattering caused by wurtzite grains has been investigated. It is found that fine grains are conducive to hot-pressed ZnS ceramics with high transmittance, especially in the short-wavelength range.
研究领域:
材料科学
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无机非金属材料
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陶瓷学
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光学材料
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纳米材料
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固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Caiyan YU,Tongtong XUAN,Sunqi LOU,Xiaoxiao LIU,Guohai LIAN,Huili LI
Recently, CuInS 2 /ZnS nanocrystals (CISZ NCs) have been widely used in many fields due to their excellent properties, such as tunable photoluminescence (PL) spectra, broad absorption, and non-toxicity. In order to expand the application of CISZ NCs, Gd 3+ was introduced into the host serving as paramagnetic modules to achieve magnetic resonance imaging (MRI) enhancement. MRI probes could provide high-resolution anatomical information. The derived Gd-Cu-In-S/ZnS nanocrystals (GCISZNCs) exhibited the strong orange photoluminescence with a quantum yield of 57.6% and significantly high longitudinal relaxivity ( r 1 =20.4 mmol/s) in comparison with commercial Magnevist (Gd-DTPA, r 1 =4.5 mmol/s). Effective enhancement of MRI and improved longitudinal relaxivity as well as lower cytotoxicity mode GCISZ NCs an ideal MRI probe, suggesting its potential and significance in practical biological and clinic applications in the future.
研究领域:
生物医学工程
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材料科学
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医学影像学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2013
·Vol. 1
·期 33
·4160-4165
·
IF 0
Wei-Wei Xiong,Guo-Hai Yang,Xing-Cai Wu,Jun-Jie Zhu
Low-toxicity, highly luminescent, and water-soluble AgInS2/ZnS nanocrystals (NCs) have been synthesized via a microwave-assisted approach. The structure and optical features of the AgInS2/ZnS NCs were characterized by X-ray diffraction, high resolution transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet visible absorption spectroscopy and photoluminescence (PL) spectroscopy. The as-synthesized AgInS2/ZnS NCs exhibited high PL quantum yields (40%) and long PL lifetimes (424.5 ns). Furthermore, the dynamic changes of the intracellular copper(II) levels in HeLa cells were monitored using the AgInS2/ZnS NCs as fluorescent probes. The results showed that the AgInS2/ZnS NCs as promising fluorescent probes can be used in the detection of intracellular copper ions in living cells.
研究领域:
纳米生物学
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分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Chenglin Zhang,Junxian Qin,Changqing Yang,Yun Hu
The conversion of the volatile organic pollutant to industrially valuable chemicals using photocatalysis is a promising endeavor. Herein, ZnS/CdIn 2 S 4 heterojunction with rich sulfur vacancy was constructed via a simple one-pot method for the selective photocatalytic oxidation of toluene to benzaldehyde . ZnS/CdIn 2 S 4 has a suitable band gap and valence band position, thus possessing a mild oxidation ability to generate benzaldehyde while avoiding excessive oxidation. In addition, the presence of tightly bound contact interfaces and sulfur vacancy in ZnS/CdIn 2 S 4 heterojunction facilitates the rapid separation of photogenerated electron-hole. These characteristics of the heterojunction synergistically promoted the selective photocatalytic oxidation of toluene, resulting in ZnS/CdIn 2 S 4 exhibiting the highest benzaldehyde production rate (1025 μmol g −1 h −1 ) and the highest conversion rate (13.7%), which were 93.1 and 56.9 times higher than those of ZnS and CdIn 2 S 4 , respectively. Furthermore, a possible response mechanism has been suggested based on a series of experiments. This study provides new insights into the combination of volatile organic pollutant degradation and high-value chemicals production.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhuobao Hong,Weihao Ye,Junjian He,Jie Luo,Linliang Yu,Xiaotang Liu
A simple sol-gel method was used to synthesize a hybrid nanostructure which can achieve the switching of dual-modal luminescence of NaYF 4 :Yb 3+ ,Er 3+ @CuInS 2 /ZnS. With 980 nm excitation, the nanoparticles exhibit red emissions, and exhibit green-yellow to red emissions under 365 nm excitation. It is noticed that the CuInS 2 /ZnS acts as a sub-energy level to mediate energy transfer between the rare earth ions of the NaYF 4 and CuInS 2 /ZnS QDs. We found that the dual-modal luminescent properties of the synthesized hybrid nanomaterials can be potentially applied in the field of anti-counterfeiting.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
DOI
高影响因子
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