CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhiwen Yang,Gongli Lin,Jieyu Bai,Lechen Li,Yangbin Zhu,Liangrui He,Zhao Jiang,Weijie Wu,Xujiang Yu,Fushan Li,Wanwan Li
Inkjet-printed quantum dot light-emitting diodes (QLEDs) are considered to be ideal candidates for use in full-color displays. However, preparation of eco-friendly blue InP QLEDs using inkjet printing techniques remains rather challenging due to the inferior optical properties of QDs. Here, we present the first efficient method for generating inkjet-printed QLEDs with high color purity using blue InP/ZnS/ZnS QDs as the emitting layer. A two-step heat-up and thick shell strategy was employed for the preparation of blue InP/ZnS/ZnS QDs with a photoluminescence (PL) peak at 465 nm, full width at half-maximum of 38 nm, and PL quantum yield (QY) of ∼ 96 %, which are the records for blue InP QDs. We found that the use of a zinc iodide precursor and anhydrous oxygen reaction environment is critical to determining InP core size, and the size distribution of InP cores can be improved by separating formation of InP magic size clusters and cores via a heat-up step at low temperature. We used two kind of zinc precursors to facilitate shell growth, and the engineered shell thickness suppresses energy transfer, enabling InP/ZnS/ZnS QDs film with high PLQYs and contributing to efficient inkjet printing of QLEDs. These results can facilitate the development of blue InP QLEDs for large-area electroluminescent full-color displays.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2013
·
IF 1.552
Junli Wang,Tingting You,Hui Feng,Kangmin Chen,Bin Xu
Template growth and catalytic growth are two typical mechanisms that are often used to produce one-dimensional II–VI semiconductor nanostructures. Here we report the selective syntheses of ZnS nanowire-bundles and nanowires respectively based on these two different mechanisms. Oleylamine is employed as solvent and coordinating agent, which induces a template growth mechanism and thus yields ZnS nanowire-bundles composed of thin nanowires. With adding AgNO 3 into oleylamine, an Ag 2 S-catalyzed growth mechanism is initiated and is found much stronger than the template growth, leading to ZnS nanowires of a relatively thick diameter. The proofs of the template mechanism arising from oleylamine and the catalytic mechanism based on Ag 2 S catalytic particles have been provided and meanwhile the competition and transition between such two mechanisms are discussed.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 13
·2277-2283
·
IF 3.741
Wang Yong,Qu Jianhang,Li Shufang,Dong Ying,Qu Jianying
We describe an electrochemical sensor for simultaneous determination of hydroquinone (HQ) and catechol (CC). A glassy carbon electrode (GCE) was modified with gold nanoparticles, L-cysteine, and ZnS/NiS@ZnS quantum dots using a layer-by-layer technique. The materials were characterized by X-ray diffractometry, field emission scanning electron microscopy, and electrochemical impedance and Fourier transform infrared spectroscopy. Cyclic voltammetry and differential pulse voltammetry revealed this modified GCE to represent a highly sensitive sensor for the simultaneous determination of HQ and CC. The anodic peak current for HQ at a working voltage of 80 mV (vs. Ag/AgCl) is related to its concentration in the 0.1 to 300 μM range (even in the presence of 0.1 mM of CC). The anodic peak current for CC at a working voltage of 184 mV is related to its concentration in the 0.5 to 400 μM range (even in the presence of 0.1 mM of HQ). The detection limits (at an S/N ratio of 3) are 24 and 71 nM for HQ and CC, respectively. The modified GCE was successfully applied to the determination of HQ and CC in aqueous solutions and gave satisfactory results.
A glassy carbon electrode was modified with gold nanoparticles, ZnS/NiS@ZnS quantum dots and L-cysteine and used for simultaneous determination of hydroquinone and catechol.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2663-2673
·
IF 3.094
Boo-Hyun Choi,Dae-Su Kim,Ku-Tak Lee,Bum-Joo Kim,Jeong-Su Kang,Sahn Nahm
Hydrothermally synthesized ZnS nanopowders comprising small and large particles were used to synthesize ZnS ceramics. Small particles (200 nm) existed in the gaps between the large particles (0.7 μm) and assisted the densification of the ZnS ceramics. ZnS ceramics sintered at low temperatures (<1000°C) exhibited small grains with large grain-boundary areas that provided diffusion paths for carbon ions from the graphite mold, resulting in carbonate absorption bands. ZnS ceramics sintered at high temperatures (≥1000°C) for a long time (≥2.0 hours) exhibited a dense microstructure with very large grains (>500 μm). The ZnS liquid phase, which was formed at approximately 980°C, assisted the densification and grain growth of the ZnS ceramics. A 3.0-mm-thick ZnS ceramic sintered at 1000°C for 16 hours showed a high Knoop hardness (321 kgf/mm 2 ) and a high transmittance of 71% in the wavelength range 6.0-12 μm without carbonate absorption bands.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Jiaru Peng,Ying Wang,Jiayu Bai,Dingxuan Ma,Ruiyang Zhao,Jishu Han,Lei Wang
Photocatalytic water splitting utilizes solar energy to produce hydrogen, which is considered as one of the most efficient approaches for solving the current global energy and environmental crises. In this work, hollow ZnTiO 3 nanospheres were prepared by calcination method, then ZnS was loaded onto the surface of ZnTiO 3 . At last, Zn 0.98 Cu 0.02 Se nanocrystals with different concentrations were modified at the outermost layer. The optimal photocatalytic hydrogen evolution amount of Zn 0.98 Cu 0.02 Se/ZnS/ZnTiO 3 reached to 36662.23 μmol·g −1 in 6 h. The construction of ternary photocatalyst effectively improved the utilization rate of light absorption, realized the rapid separation and transfer of electrons, significantly suppressed the recombination of charge carriers and was benificial for the enhancement of photocatalytic hydrogen evolution performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Ku-Tak Lee,Boo-Hyun Choi,Jong-Un Woo,Jeong-Su Kang,Jong-Hoo Paik,Byoung-Uck Chu,Sahn Nahm
ZnS nanopowders annealed at low temperatures (≤550 °C) have a pure cubic structure, while a small amount of hexagonal phase formed in specimens annealed at temperatures ≥700 °C. The particle sizes of the ZnS nanopowders increased with the annealing temperature. ZnS ceramics that were sintered using ZnS nanopowders annealed at low temperatures (≤550 °C) exhibited low transmittance, because of their porous microstructure. ZnS ceramics that were synthesized using ZnS powders annealed at high temperatures (≥800 °C) containing large agglomerated particles, also exhibited low transmittance, due to the presence of a liquid phase. A carbonate absorption band was found from the ZnS ceramics with small grains, because carbon ions diffused from the graphite mold into the ZnS ceramics during sintering, probably through the grain boundaries, and formed carbonates. A ZnS ceramic that was sintered at 1020 °C using the nanopowders annealed at 750 °C exhibited dense microstructure, with a large transmittance, 68%, in the wavelength range 6.0–12 μm.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 34
·17671-17676
·
IF 5.968
Wenze Shan,Linfeng Hu,Xin Lin,Min Chen,Limin Wu
This paper presents a simple and effective strategy to construct a UV photodetector based on ZnS hollow-spheres by oil–water interfacial self-assembly of polystyrene (PS)/ZnS colloidal nanospheres followed by annealing treatment. In this approach, PS/ZnS colloidal nanospheres were prepared and then self-assembled into a closely packed PS/ZnS nanofilm at a “hexane–water” interface. By annealing this precursor nanofilm under an optimal condition, a ZnS hollow-sphere nanofilm with a densely packed network structure was obtained. The particle size and morphology of the PS/ZnS colloidal nanospheres and the as-transformed ZnS hollow-spheres were characterized by TEM, HRTEM and SEM. Finally, a UV photodetector was successfully constructed from the as-transformed ZnS hollow-sphere nanofilm.
研究领域:
材料科学
·
纳米技术
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2012
·
IF 7.286
Shuling Shen,Yejun Zhang,Yongsheng Liu,Long Peng,Xueyuan Chen,Qiangbin Wang
Doping semiconductor nanocrystals and integrating disparate components together are two effective ways for modulating the optical properties of semiconductor nanocrystals. For the first time, we successfully synthesized Mn-doped Ag2S-ZnS heteronanostructures (HNSs) by combining these two strategies together. The obtained Mn-doped Ag2S-ZnS HNSs exhibit multicolor emissions of blue, orange, and near-infrared (NIR), in which the blue emission originates from ZnS trap state, the orange emission is induced by the 4T1–6A1 transition in Mn2+ dopant, and the NIR emission is attributed to the band gap emission of Ag2S. Reaction temperature-dependent and Mn2+ dopant concentration-dependent optical properties, as well as the growth kinetics of Ag2S-ZnS HNSs during doping process, were systemically studied to achieve the desirable optical properties and preserve well-defined HNSs simultaneously. We expect that the prepared Mn-doped Ag2S-ZnS HNSs with tunable multicolor emissions will create numerous opportunities for potential applications in bioimaging and optoelectronic devices, and the facile methodology modulating Ag2S-ZnS HNSs with desirable properties will be general and be ready to other complex semiconductor nanostructures.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Xiaowen Liu,Xin Zhang,Yuanyuan Liu,Mengjia Liu,Xiaodan Miao,Yuanfan Wang
Crystal morphology of nanomaterials has a strong influence on its adsorption-photocatalytic activities. In this work, ZnS nanomaterials (NMs) with various shapes were synthesized by substitution reaction using ZnO as templates. The obtained ZnS NMs existed in the forms of ZnO pseudomorph with cubic sphalerite structure and were composed of numerous nanocrystal ZnS. Due to its porous nature, short nanotubes exhibited better adsorption performance for methylene blue (MB) than nanosheets or nanotubes. Their photocatalytic efficiency for MB followed nanosheets > short nanotubes > nanotubes. There was a higher exposure ratio of {100} crystal planes on nanosheets than that on nanotubes or short nanotubes. The density of Zn-S broken bond on the crystal plane followed D (100) >D (110) > D (111) . The higher exposure ratio of {100} crystal planes could not only endow ZnS nanosheets with a narrower bandgap, but also provide more sites to absorb reactants and trap electrons or holes.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 24
·4812-4817
·
IF 0
Jianbing Zhang,Weipeng Sun,Liping Yin,Xiangshui Miao,Daoli Zhang
A green method for the one-pot direct synthesis of hydrophilic CuInS2 and CuInS2–ZnS colloidal quantum dots was developed employing N,N-dimethylformamide (DMF) as a solvent. Highly reactive H2S gas, in situ generated from the reaction between FeS and H2SO4, was utilized as the sulphur source for the synthesis of hydrophilic CuInS2 quantum dots. Short chain thiols were applied as ligands, reactivity controllers and sulphur sources for the growth of the ZnS shell. The growth of CuInS2 quantum dots experiences a typical Ostwald ripening process, and it should be controlled in 45 min due to the pyrolysis of the ligands. The reaction temperature should not exceed 130 °C. The ZnS shell was grown on CuInS2 quantum dots in a very simple and one-pot approach. Both the luminescence and optical stability were improved substantially after the formation of the ZnS shell. The versatility of this synthetic strategy was demonstrated by extending it to the synthesis of other metal sulphide quantum dots, for instance, CdS and ZnS quantum dots.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Ming Li,Tongyan Ren,Yubao Li,Shuang Li,Ping He,Yao Xiao,Jiufu Chen
In this study, a series of promising binary hybrid heterojunction CdIn 2 S 4 /ZnS (CIS/ZnS) were constructed via a facile hydrothermal method . Credible characterization methods including powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–vis diffuse reflectance spectra (DRS) were carried out to investigate the physicochemical properties the as-obtained photocatalysts . Photocatalytic water splitting for hydrogen evolution was performed to evaluate the photocatalytic activity of the photocatalyst. The results indicate that the light-harvesting ability could be markedly enhanced by decorating CdIn 2 S 4 on ZnS microspheres . Compared with the pristine CdIn 2 S 4 and ZnS, the hybrid photocatalysts present more efficient photocatalytic hydrogen production performance. Among composite photocatalysts, the 5% CIS/ZnS sample manifests the highest photocatalytic hydrogen production rate of 10.80 mmol g −1 h −1 , which is 2.6 and 5.4 times higher than that of ZnS and CdIn 2 S 4 , respectively. Moreover, a type-I band alignment mechanism was prudently put forward to interpret the photocatalytic hydrogen generation activity. The boosted photocatalytic hydrogen evolution activities of CIS/ZnS can be attributed to the enhanced light-harvesting ability, efficient separation and transfer of the photo-induced charge carriers, and inhibition of electrons and holes recombination of binary hybrid CIS/ZnS photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 46
·465201
·
IF 3.399
Congcong Wang,Dingke Xue,Xinyu Shen,Hua Wu,Yu Zhang,Haining Cui,William W Yu
Perovskite white light-emitting devices (WLEDs) without intercalation layers have not been achieved due to the ion exchange. Although the intercalation layers prevent ion exchange between perovskite nanocrystals (NCs), it also creates a new problem of charge imbalance and the structure becomes more complex. In this study, blue emitting ZnCdS/ZnS NCs with high quantum yield and stability are introduced to work with the yellow emission from CsPb(Br/I)3 perovskite NCs for WLEDs. The WLEDs are constituted of ITO/ZnO/PEI/ZnCdS/ZnS NCs/CsPb(Br/I)3 NCs/TCTA/MoO3/Au. This design avoids ion exchange between different perovskites NCs, and realizes white light emission by simple fabrication. As a result, we achieved the white light coordinates of (0.34, 0.34) and a correlated color temperature of 5153 K.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）