Advanced Optical Materials
·
2014
·Vol. 2
·期 8
·771-778
·
IF 0
Hui Liu,Zhiming Zhang,Linfeng Hu,Nan Gao,Liwen Sang,Meiyong Liao,Renzhi Ma,Fangfang Xu,Xiaosheng Fang
A new UV-A photodetector based on K 2 Nb 8 O 21 nanowire is successfully fabricated for the first time. The potassium niobate is synthesized using a facile molten method. The K 2 Nb 8 O 21 nanowire photodetectors exhibit an excellent sensitivity and wavelength selectivity with respect to UV-A light. Furthermore, the photodetectors show great advantages in response time compared with other sensors based on single-oxide semiconductor nanostructures, and, especially, the responsivity is much better than that of single ZnS nanobelt photodetectors. The mechanism of conductivity is explained from the viewpoints of field emission and thermionic field emission for the change of light intensities.
研究领域:
材料科学
·
光电技术
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenji Zheng,Yanan Dong,Tiantian Li,JiaHong Chen,Xi Chen,Yan Dai,Gaohong He
Self-powered ultraviolet (UV) photodetector (PD) with high responsive performances are highly required. However, most reported work are focused on modifying the interface between semiconductor and electrolyte to improve separation of electrons and hole, but little work has been devoted to the interface between semiconductor and the conductive substrate, where recombinations of electrons and holes occurred, resulting in much photocurrent loss. Therefore, in this work, MgO ultra-thin layer was proposed to serve as a hole blocking layer (HBL) between TiO 2 nanoparticles (NPs) layer and the FTO conductive substrate. SEM, EDX and XRD characteristics demonstrate the successful attachment of MgO nanofilm on FTO substrate. By controlling TiCl 4 hydrolysis process , two layers of TiO 2 NPs including the bottom compact layer and the upper multiple branches layer have grown on MgO nanofilm modified FTO substrate. The self-powered UV PDs are assembled by sandwiching TiO 2 NPs with or without MgO between two FTO substrates. The MgO/TiO 2 NPs based UV PD exhibits appealing performance with responsivity of 29.97 AW −1 , sensitivity of 10 4 and rising time of 0.02 s, showing 2, 5 and 2 times higher than those of the pure-TiO 2 NPs based UV PD, respectively. The obtained high response performances can be ascribed to the MgO HBL. Due to the energy band alignment between MgO and TiO 2 , photo-generated holes are effectively blocked to avoid their flowing back to FTO substrate to recombine with photoelectrons . While the wide band gap of MgO provides a favorable tunnel for electrons, thus resulting in less photocurrent loss between TiO 2 NPs and FTO substrate. Furthermore, MgO/TiO 2 NPs based UV PD shows significant UV light selectivity and stability. Consequently, the proposed holes blocking effect of MgO may pave a way to develop UV PDs with high efficiencies.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
光电探测器
·
半导体物理
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DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 20
·2201107
·
IF 10.05
Xing Xu,Sha Jiang,Chao Fan,Qi Deng,Lei Shen,Qinglin Zhang
Lead-free CsCu 2 I 3 has attracted tremendous research interests for photonics and photoelectronics due to their nontoxicity, unique electronic structure, and excellent stability. However, it is still challenging to achieve large-scale ordered arrays of CsCu 2 I 3 micro/nanowires, which limits their functional applications in integrated optoelectronic devices. Herein, unidirectional CsCu 2 I 3 wire arrays are achieved in centimeter scale through a modified microchannel-assisted spatial confinement strategy, which can confine the precursor solution into the pre-fabricated microchannel arrays in large area and control its evaporation. The microstructure characterizations reveal that the orthorhombic CsCu 2 I 3 wires are grown along the c -axis with high crystallinity. The control experiments and theoretical studies indicate that the initial CsCu 2 I 3 nucleation at the front of the solution in the channels and the stable solute supply maintained by the movement of the coverslip determine the growth of the wires. The photodetectors based on the CsCu 2 I 3 wires show a high responsivity (80 mA W −1 at 365 nm; 1.29 A W −1 at 330 nm) and fast response speed ( t rise / t decay = 640 µs/7.1 ms). Furthermore, these CsCu 2 I 3 wire arrays exhibit great potential in future flexible electronic and UV imaging applications. This work opens a new way to grow well-aligned copper-based halides nano/microwire arrays for the integrated optoelectronics applications.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
半导体物理
·
光电探测器
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3534-3550
·
IF 4.5
Meng Yuan,Luo Jian,Wu Yu,Hu Jianfei,Huang Wenjie,Hu Chunyan,Jiang Tao,Hao Tonghui,Zhang Qunchao
Fluorine-containing coatings play an essential role in waterproof paint, but the harm of fluoride to the environment does not meet the current environmental protection requirements. The present study reports an eco-friendly and fluoride-free waterproof hybrid coating prepared by a semi-continuous seed emulsion method employing vinyl tributbutoxy silane (VTBS) as the functional monomer and octyl triethoxysilane modified SiO 2 (OTES@ SiO 2 ) as the inorganic filler. In vinyl acetate/butyl acrylate hybrid coatings, the surface covering of OTES@SiO 2 and the cross-linking structure produced by VTBS not only significantly improve the thermal stability, mechanical properties, and strong hydrophobicity but also reduce the water absorption. In addition, the gloss loss of the organic–inorganic hybrid layer is <30% after being exposed to UV-irradiation for 720 h. The obtained coating could be a lovely environmental-friendly protective coating for many functional areas, especially for outdoor applications.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Xiongfa Yang,Yan Song,Yaohuang Jiang,Xiaoling Wang,Yina Yang,Jianhua Wang,Xiaojia Wang,Na He,Guoqiao Lai,Yanchun Yu
There are numerous noxious bacteria, fungi and parasites in environment for human survival, so antibacterial materials are significant for medical devices , food packaging, and personal care. UV–curable silicone modified antibacterial materials were prepared from Schiff base–containing silicone modified hyperbranched thiol and castor oil based polyurethane acrylates (PUAs) by UV initiated thiol–ene click reaction. It exhibited that these UV–curable materials show fairly good antimicrobial activity of Escherichia coli ( E. coli ) and Neurospora crassa. A contact–kill antibacterial mechanism was proposed according to the antibacterial behavior of these UV–curable materials. These materials also exhibit a fairly high transparency over 92 % and pencil hardness can reach 4H. It need to be pointed out that the surface water contact angle of these materials is in the range of 84.1°–74.7°, which means these materials exhibit a certain degree of hydrophilicity, which can overcome the shortcoming of traditional polydimethylsiloxane(PDMS) to some content. These UV–curable materials show quite good mechanical performance because the tensile strength of them can reach 11.6 MPa. It denotes that the UV–curable Schiff base–containing antibacterial silicone modified materials may be a good candidate of antibacterial materials.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yu Miao,Chong Wang,Jixiao Wang,Zhi Wang
Thin film composite reverse osmosis (TFC RO) membrane technology has seen widespread application in seawater/brackish water desalination and wastewater treatment . However, there are still problems such as unsatisfactory perm-selectivity and anti-fouling properties, and low feasibility of membrane manufacturing process. In view of the above problems, a novel UV-initiated modification process integrating with "Semi-interpenetrating polymer networks construction" and "Photo-Fries rearrangement initiation" is proposed. TFC RO membranes with both high perm-selectivity and anti-fouling properties were prepared by introducing polymerizable molecules (MAM, SA , AM) into the aqueous phase and conducting UV irradiation during interfacial polymerization (IP) process. The results showed that under the brackish water test conditions, the water flux and NaCl rejection of the optimal modified membrane (MAM-UV) were 77.5 L m −2 h −1 and 99.44%, respectively, which are 23.8% and 0.2% higher than those of the unmodified membrane (VIR-RO), respectively. The results of the anti-fouling test showed that MAM-UV exhibited good anti-fouling properties against both bovine serum albumin (BSA) and lysozyme (LYZ). In addition, the novel UV-initiated modification process proposed in this paper has broad prospects for industrial application because of its simple operation and easy scale-up.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 52
·33780-33788
·
IF 4.036
Jiaojiao Liu,Jie Zhang
It has been a universal route for enhanced photoelectric performance in photodetectors by constructing a heterojunction that is conductive for suppressing recombination of photogenerated carriers and promoting collection efficiency, and probably producing self-powered capability. However, the dependence of the built-in electric field distributions created by the heterojunction on photodetector performance has rarely been investigated. Herein, two kinds of self-powered UV–visible photodetectors with different device architectures based on single Se wire and CsPbBr3 particles are facilely fabricated and compared. It is found that both the two photodetectors show excellent self-powered operating properties, fast response and binary response. However, due to the different distributions of built-in electric field caused by device architectures, it yields a significant photovoltaic voltage distinction and different responsivity and detectivity spectra for the Se/CsPbBr3 photodetectors. These results are conductive to guide the design of self-powered heterojunction photodetectors by regulating the built-in electric field distributions.
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 5
·3382-3390
·
IF 4.186
Chengrui Liu,Juan Jiang,Guohong Zhou,Tianjin Zhang,Song Hu,Lin Gan,Xianpeng Qin
Highly transparent cerium-doped yttria ceramics were fabricated via a pressureless sintering method with an addition of 10 at.% La 2 O 3 and 1 at.% ZrO 2 as a binary sintering additive. With an increase in the Ce doping concentration from 0 to 3 at.%, the optical absorption edge of yttria ceramics exhibited a significant red shift from 290 to 380 nm as a result of the 4f–5d transition of Ce 3+ and the charge transfer of Ce 4+ (i.e., Ce 4+ +e – →Ce 3+ ). For a 2-mm thick sample doped with 3 at.% Ce, the total ultraviolet radiation (UV) transmittance (220–400 nm) is only 1.7%, indicating a nearly complete UV absorption. Meanwhile, the specimens possess high in-line transmittance levels in both the visible and the infrared regions (i.e., >70% at 450 nm and ∼80% at 1100 nm). Additionally, the present specimens were confirmed to have good enough mechanical strength levels (∼165 MPa) and thermal conductivity (∼5 W/m·K), which are comparable or even better compared to those of previously reported transparent yttria ceramics. The results of this work indicate that cerium-doped transparent yttria ceramics are promising candidate materials for full-band UV-shielding window applications.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 2
·1263-1281
·
IF 6.123
Yang Xianwen,Liu Xiaohui,Yang Xuan,Zhang Qiuyan,Zheng Yunbo,Ren Yuanlin,Cheng Bowen
Polyester/cotton (PET/CO) fabrics usually burn more violently than single-component fabric due to significant differences of two components as well as “wick effect” during combustion process. Hence, it is very challenging to impart PET/CO fabrics excellent flame retardancy. In this work, a new monomer (ethoxy piperazine (phenyl) phosphoryl ethyl methacrylate, EPPEM) containing multiple unsaturated double bonds was synthesized. As EPPEM contained varied synergistic flame retardant components of phosphorus, nitrogen, and benzene ring, it was expected to form a dense cross-linked network structure on the surface of the fabrics by UV curing to prepare PET/CO fabrics with good flame retardancy and washing resistance. The limiting oxygen index (LOI) value of treated PET/CO fabrics increased up to 27.2% from 17.8% of control sample, which still reached 26.6% after 25 laundering cycles, indicating excellent flame retardancy and water-laundering resistance. Raman spectroscopy, thermogravimetric analysis coupled with Fourier transform infrared analysis and thermogravimetric mass spectrometry indicated that EPPEM promoted the production of more non-combustible compounds during pyrolysis process, such as H 2 O and CO 2 . Furthermore, EPPEM decomposed to produce acidic substances which promoted dehydration and coke formation of PET/CO fabrics, thereby preventing exchange of heat and combustible gas. On the basis of the results, a two-phase flame-retardant mechanism of EPPEM/UV-curable system for PET/CO fabrics was proposed.
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高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 4
·2100824
·
IF 4.402
Zhi Li,Shujun Zhao,Huiwen Pang,Yi Sun,Shifeng Zhang,Yanglun Yu
Functional cationic waterborne polyurethanes (CWPUs) with environmental friendliness and excellent mechanical properties are widely desired in the materials industry. However, traditional modification methods such as molecular structure adjustment, crosslinking modification, and physical filling for polyurethane are overly complex and do not typically improve mechanical properties to the point of satisfying the stringent requirements for modern industrial materials. In this study, phenolic acid 3,4-dihydroxybenzoic acid with a catechol structure is applied to neutralize the tertiary ammonium structure on the side chain of polyurethane for the facile preparation of CWPU materials. The effects of this neutralizer on the microstructure, mechanical properties, and functional performance of CWPU samples (e.g., antibacterial, ultraviolet protection, coating properties) are systematically investigated. The results indicate that the catechol structures of the neutralizer provide abundant hydrogen bonding reaction sites, which greatly improves the mechanical properties of the CWPU films with the maximum strength of 43 MPa and simultaneously 1241% elongation at break. Furthermore, catechol structure and cationic attribute endow the CWPUs with excellent adhesion to various substrates, strong ultraviolet protection performance, and antibacterial ability. The proposed approach can be used to prepare robust CWPUs with strong functional performance as highly effective, environmental-friendly materials over a large scale.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xiaolong Yu,Xu Jin,Hang Liu,Yuanyuan Yu,Jin Tang,Rujin Zhou,Aiguo Yin,Jianteng Sun,Lizhong Zhu
Atrazine residue in the environment continues to threaten aquatic ecosystem and human health owing to its adverse effect. However, limited researches focused on degradation mechanism of atrazine by UV/bisulfite, especially risk of intermediates at cellular and molecular level has not been seriously elaborated. In current work, transformation patterns and residual toxicity of intermediates of atrazine by UV/bisulfite were systematically investigated. The atrazine degradation was described by a pseudo first-order kinetic model ( K obs = 0.1053 min −1 ). The presence of H 2 PO 4 − , HCO 3 − and HA had a powerful inhibition. Scavenging test of radicals illustrated that SO 4 •− , •OH and O 2 •− existed in UV/bisulfite system, SO 4 •− and •OH were mainly responsible for atrazine degradation. Eight degradation intermediates were identified, which were involved in dealkylation, alkyl oxidation, dechlorination-hydroxylation, and alkylic-hydroxylation. E. coli as a model microorganism was selected to assess the risk of degradation intermediates. The levels of reactive oxygen species , MDA and Na + /K + -ATPase were declined, suggesting that oxidative damage induced by these intermediates was weakened. According to differential metabolites expression analysis, several key metabolites including aspartate , L-tryptophan, L-asparagine, cytidine, cytosin, stearic acid , behenic acid, were up-regulated, and glutathione , cadaverin, L-2-hydroxyglutaric acid and phytosphingosine were downregulated, clarifying that effective detoxification of atrazine can be performed by UV/bisulfite.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chenchen Zhou,Jia Man,Jianyong Li,Bin Qi,Zesheng Hua,Chenxu Liu,Minyi Zhang,Jianfeng Li
Anisotropic ceramic microparticles have been extensively studied in various fields such as mechanical transmission, wave absorbing, structural materials, and abrasives owing to their remarkable properties. The shape of the microparticles plays an important role in their functions. Here, we presented a facile and tunable microfluidic approach to fabricate the ceramic microparticles (∼370 μm in diameter) with the bowl shape, which have been quite challenging for synthesizing to date. Double UV lights were applied to shape the microparticles. By tailoring the cross angle and the intensities of both UV lights, bowl-shaped ceramic microparticles with different opening sizes (0–340 μm) and hollow spherical ceramic microparticles with different-sized through-holes ( f = 0–0.265) were fabricated. These obtained ceramic microparticles hold great potentials to be used as the micro-components in sewage filters, micro ball valves, MEMS , micro-robots, and so forth.
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高影响因子
危险品化学品经营许可证（带存储）