Advanced Optical Materials
·
2019
·Vol. 7
·期 10
·1900023
·
IF 7.125
Liang Chen,Wei Tian,Liangliang Min,Fengren Cao,Liang Li
Designing Si nanowire-based heterostructures provides a promising path to construct self-driven and broadband photodetectors, which are the key components for optoelectronic systems. Herein, the first fabrication of a p-CuIn 0.7 Ga 0.3 Se 2 nanoparticles/n-Si nanowire array core–shell structure through a simple two-stage process—spin coating and selenization treatment—and its integration into a self-driven photodetector are reported. The heterojunction photodetector is sensitive to broad wavelength range from UV light to visible and near-infrared light, with high detectivity of up to 1.6 × 10 13 Jones, large responsivity of 0.33 A W −1 , and an ultrafast response speed of 823/356 µs at zero bias. Additionally, this core–shell nanostructure exhibits good air stability and strong ability to detect weak light sources such as fluorescent lamp and lighter. The superior performance can be attributed to the strong light absorption of both Si and CuIn 0.7 Ga 0.3 Se 2 , the unique vertically standing core–shell structure, and effective photogenerated carriers' separation and transportation at the heterojunction interface.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yan Yang,Sujing Yu,Jingyu Guo,Dongzhi Zhang
The UV-enhanced sensing performance of the two-dimensional polyimide/indium oxide (2DPI/In 2 O 3 ) based sensor towards NH 3 was investigated at room temperature of 25 °C. The 2DPI/In 2 O 3 composite materials with hydrogen bond were synthesized by hydrothermal method , which is sensitive to NH 3 in the absence or presence of UV illumination. The microstructure, morphology and constituent elements of the prepared samples were characterized by SEM, TEM , XRD , XPS , FT-IR and UV–visible analysis. The as-prepared 2DPI/In 2 O 3 based sensor shows the best sensing performance compared to those of pure 2DPI and pure In 2 O 3 sensors. In terms of the sensitivity of the 2DPI/In 2 O 3 based sensor, the synergistic effect between 2DPI and In 2 O 3 leads to an enhancement of three times response of the composite sensors under UV illumination compared with the response of composite sensors without UV illumination. Particularly, the response time and recovery time of the 2DPI/In 2 O 3 based sensor towards 1 ppm NH 3 are shortened by 10 s and 20 s under 365 nm UV illumination, respectively. The significant enhancement in sensing performance is due to the formation of the heterojunction between 2DPI and In 2 O 3 . Besides, 2DPI acts as photocatalytic promoter in the 2DPI/In 2 O 3 composite. The 2DPI/In 2 O 3 based sensor is a promising candidate for UV-assisted NH 3 detection at room temperature.
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CHEMOSPHERE
·
2017
·
IF 4.208
Aimin Li,Zhe Zhang,Peifeng Li,Lejuan Cai,Lizhi Zhang,Jingming Gong
Effective decomposition of perfluorooctanoic acid (PFOA) has received increasing attention in recent years because of its global occurrence and resistance to most conventional treatment processes. In this study, the complete mineralization of PFOA was achieved by the UV-photolysis of nitrate aqueous solution (UV/Nitrate), where the in-situ generated nitrogen dioxide radicals ( NO 2 ) efficiently mediated the degradation of PFOA. In particular, when the twinborn hydroxyl radicals were scavenged, the production of more NO 2 radicals realized the complete mineralization of PFOA. DFT calculations further confirm the feasibility of PFOA removal with NO 2 . Near-stoichiometric equivalents of fluoride released rather than the related intermediates were detected in solution after decomposition of PEOA, further demonstrating the complete degradation of PFOA. Possible PFOA degradation pathways were proposed on the basis of experimental results. This work offers an efficient strategy for the complete mineralization of perfluorinated chemicals, and also sheds light on the indispensable roles of nitrogen dioxide radicals for environmental pollutants removal .
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CELLULOSE
·
2022
·Vol. 29
·期 8
·4439-4453
·
IF 6.123
Li Yinan,Li Huixin,Huang Jin,Huang Liulian,Chen Lihui,Ni Yonghao,Zheng Qinghong
A highly transparent ZnO/cellulose composite membrane with UV sensing and shielding abilities was prepared via a facile blending method. ZnO nanoparticles (ZnO NPs) without additional surface modification are uniformly dispersed in the regenerated cellulose (RGC) matrix through the N-methyl-morpholine-N-oxide (NMMO) dissolution of cellulose. Agglomeration of the ZnO NPs is effectively minimized, thanks to the strong hydrogen bonds between ZnO NP and cellulose. The optimized ZnO/RGC membrane exhibits not only high a shielding ratio of 97.67 ± 0.11% for UV lights (< 360 nm) but also high transparency of 87.12±1.55% in the visible light region, which is comparable to traditional plastic products. Benefiting from the high photoelectric performance of ZnO NPs, a UV sensor and a UV blocker were integrated into the same device. The as-fabricated ZnO/RGC membrane, with sensitive UV detecting and effective blocking, as well as the rich availability of cellulose as raw material and its biodegradable nature, is an ideal candidate for high-performance UV detection and protection applications. Graphical abstract
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AICHE JOURNAL
·
2019
·Vol. 66
·期 2
·e16841
·
IF 3.463
Chong Shen,Minjing Shang,Hong Zhang,Yuanhai Su
In this work, we report a simple and inexpensive UV-LEDs based photomicroreactor assembly constructed by commercially available components. The photoisomerization of norbornadiene to quadricyclane was selected to validate this novel photomicroreactor design. Mass transport limitation was eliminated and indicated by dimensionless numbers Fo and Da II , and photons loss was evaluated considering the absorption and reflection of the microreactor walls. The solvents, photosensitizers, and light sources selections were optimized for achieving better photochemical performance and mechanistic insights. The detailed comparison between the high-pressure mercury arc lamp and the UV-LEDs strip revealed great potential of UV-LEDs as appealing light source for photochemical transformations. Moreover, the reaction mechanism was thoroughly discussed and illustrated by the Jablonski diagram indicating electronic states transitions. According to possible intermediate steps, a kinetic model was proposed with the reaction rate constant being correlated with the photon flux, which is valuable for process optimization and further understanding reaction mechanisms.
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ACS ES&T Engineering
·
2024
·
IF 7.4
Hanling Jiang,Jingwen Wang,Aijuan Zhou,Yong Liu
Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH4+-N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH4+-N to nitrogen gas (N2). Nearly all of the NH4+-N (30 mg N/L) could be removed within 15 min, and the N2 selectivity was achieved at 95.0%. The addition of CaO made NH4+-N exist in the form of NH3, and HO• was the critical reactive species for NH4+-N oxidation. NO, N2H4, and NO2– were identified as oxidation intermediates and could be further removed. The reaction between N2H4 and NO2– with the assistance of UV/CaO promoted N2 generation during NH4+-N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH4+-N oxidation, while the presence of CO32– (100 mM) significantly retarded the removal of NH4+-N. As high removal of NH4+-N (100%) and high N2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH4+-N in practical water treatment.
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Advanced Sustainable Systems
·
2020
·Vol. 4
·期 7
·2000043
·
IF 4.869
Zi Wang,Lirong Tang,Fengcai Lin,Yanping Shen,Yandan Chen,Xuerong Chen,Biao Huang,Beili Lu
Using natural biomass resources to synthesize degradable membrane materials, which may replace traditional plastics, is one of the strategies that can reduce pollution. Herein, a mechanochemical method for preparation of degradable biofilm tannic acid-modified microfibrillated cellulose (TA@MFC)-G is proposed. The method involves modification of a microfibrillated cellulose (MFC) with plant polyphenol (tannic acid), followed by complexation with gelatin in an aqueous solution. Compared with pure gelatin film, MFC film has higher intrinsic crystallinity and thermal stability. Due to the synergistic effect of tannin and MFC, the mechanical strength and flexibility of the films are improved; its tensile strength is higher than 75 MPa and its elongation at break is as high as 13%. The films also have high UV blocking ability. Finally, the films are printed using Fe 3+ ions or conventional ink, from which it is observed that the pattern printed using Fe 3+ ions has higher solvent resistance and water repellency compared to that printed using conventional ink. This biodegradable film may have promising applications as food packaging materials or in other industries.
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POLYMER
·
2025
·
IF 4.5
Tiantian Zha,Weitao Zhou,Jikai Chen,Yang Liu,Yifan Liu,Xu Wang,Xinxin Li,Boyu Li,Qi Han,Shan Du
Silk sericin (SS) hydrogels are attractive for soft-matter applications due to their natural origin, ease of processing, and superior hydrophilicity, yet their poor compressibility and structural stability remain key limitations. Here, we report a facile and scalable route for producing highly compressible ionic hydrogels by covalently grafting glycidyl methacrylate (GMA) onto SS (SS-g-GMA). The grafting density can be tuned between 81.26 % and 98.86 % simply by adjusting temperature and GMA dosage, yielding a UV-curable precursor that maintains excellent rheological properties. Photopolymerization generates a uniform, interconnected microporous network with pore sizes of average 27.24 μm pores, which imparts the hydrogel with an exceptional compressive stress of 70.03 kPa at 67.09 % strain and an ionic conductivity of 0.15 S m −1 . The recombination of hydrogen bonds facilitates rapid electrical self-healing (93.21 % recovery within 15 s). The stress-dependent resistance changes exhibit linear characteristics, rendering this compressible ionic hydrogel suitable for applications in stretchable electronics, biomedical scaffolds, and soft actuators.
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高影响因子
VIROLOGICA SINICA
·
2025
·
IF 4
Jia Wang,Zhongqiang Wu,Xiaoqin Yang,Chengfeng Lei,Xiulian Sun
Entomopathogenic viruses, such as baculoviruses and cypoviruses, have been employed as biological pesticides against agricultural and forestry pests. However, their susceptibility to inactivation under field UV radiation has limited broader application. In this study, we effectively improved the UV resistance of insect virus occlusion bodies (OBs) by coating their surfaces with silica nanoparticles (SiO 2 NPs). Monodisperse SiO 2 NPs with uniform size distribution and excellent colloidal stability were synthesized using the Stöber method. Subsequent amination modification of the SiO 2 NPs with a silane coupling agent shifted their isoelectric point from 3.2 to 8.1. This modification imparted a strong positive charge to the NPs within the pH range of 4.5–5.5, while the OBs of insect viruses remained negatively charged in this range. Consequently, the amino-functionalized SiO 2 NPs were successfully coated onto the surfaces of OBs of three representative insect viruses: nucleopolyhedrovirus, granulovirus, and cypovirus, through electrostatic interactions. Laboratory bioassays confirmed that Mamestra brassicae multiple nucleopolyhedrovirus (MbMNPV) coated with SiO 2 -NH 2 NPs retained its native viral pathogenicity against Spodoptera exigua larvae under normal laboratory condition, while it demonstrated 2.299–2.712 folds higher potency than MbMNPV physically mixed with unmodified SiO 2 NPs after UV irradiation. Outdoor trials revealed that SiO 2 -NH 2 NPs coating significantly improved the survival time of MbMNPV, with the median survival time increased from 1.43 days to 5.15 days. This nanoparticle coating strategy establishes a robust platform for developing photostable biopesticides while preserving their ecological safety profiles. The modular nature of this approach suggests its broad applicability across different entomopathogenic virus formulations.
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DOI
PubMed
高影响因子
Environmental Pollutants and Bioavailability
·
2025
·
IF 3.2
Biao Liu,Qinghua Ai,Youyang Lai,Meng Li,Zhengpeng Feng,Qian Zhang
Aquatic plants used in lake remediation accumulate heavy metals, turning biomass into waste. Herein, biochar (M-AcBC) derived from metal-laden Acorus calamus was combined with sodium percarbonate (SPC) and UV light to degrade tetracycline (TC). M-AcBC contained dispersed CuO, ZnO, and Fe3O4, exhibited defect structures, higher graphitization, and larger surface area than pristine biochar. Under optimal conditions (1.0 g/L M-AcBC, 0.3 mM SPC, pH 3, 900 µW/cm² UV), 90% TC removal was achieved. During the dark phase (0–40 min), functional groups, persistent radicals, and Fe₃O₄ activated SPC to generate •OH, •O2-, and 1O2. Upon UV irradiation (40–120 min), ZnO produced electron-hole pairs that further formed •OH and •O2-. The system exhibited synergistic effects, good reusability, broad applicability to various antibiotics, and reduced ecotoxicity of intermediates. This work provides a waste-to-resource strategy and new insights into the M-AcBC/SPC/UV system for water treatment.
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高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
XiangBo Wang,Ye Tian,Joan Josep Carvajal,Jing Ren,Lu Liu,Jianzhong Zhang
Lanthanide-doped metal halide perovskites (MHPs) generate tunable emissions in visible and near infrared (NIR) with large Stokes shift. One of their most promising emissions is the telecom-band through the luminescence generated by the co-doping of Yb3+ and Er3+. Up to now, high doping concentrations of Yb3+ and Er3+ simultaneously into MHPs nanocrystals (NCs) remained a formidable challenge, which lead to weak luminescence intensity and greatly restrained their practical applications. We have been able to synthesize Yb3+/Er3+-rich CsPbCl3 NCs with bright NIR emission by a modified hot-injection method at higher temperature (280 ℃), which overcomes the low-doping barrier in conventional synthetic temperature (220 ℃), enhancing the doping level of Yb3++Er3+ from typically below 5% to more than 12%. The highly Yb3+/Er3+ doped NCs emitted at 1540 nm efficiently, with an optimal photoluminescence quantum yield (PLQY) of 21.6%. By embedding these highly doped MHPs NCs into a polymer, the stabilities of the NCs in harsh environments can be highly improved. Further, a composite-based on-chip waveguide was fabricated, with a gain at 1540 nm as high as 10.7 dB in just a 1 cm polymer waveguide when the pump power was only 30 mW. In addition, solar pumping of Er3+ has been successfully demonstrated in these waveguides without the use of cumbersome sunlight collectors. Overall, the realization of a 1540 nm polymer on-chip waveguide offers new opportunities for optical microchips, communications, and interconnections.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Bin Yang,Kun Wang,Xiaoming Shi,Yongxian Zhao,Junyi Chen
Tough and stretchable elastomeric resins are useful materials, particularly for coatings and additive manufacturing, which constructs 3D objects through the successive deposition of curable materials. Though elastomeric resins are valued for their flexibility and mechanical resilience, remain limited in availability. In this work, a photocurable resin capable of producing highly elastic material is designed and synthesized. The resin is derived from polybutadiene-based thermoset polyurethane, which is degraded and functionalized through olefin cross-metathesis reaction. The elastomeric resin can be efficiently cured by UV light, affording robust elastomers with an excellent elongation rate (>1300%). The study reveals that the molecular architecture of the resin plays an important role in UV curing and the resulting elastomer properties. Model studies suggest the fragment architecture within the resin prevents shrinkage during UV-curing, which is a common and undesired phenomenon for photocurable elastomers. Moreover, the elastomeric resin's physical properties are tuned by incorporating a cellulose-based reinforcing component (CA-MA) and systematically adjusting the formulation. Tensile testing indicated that the addition of CA-MA significantly enhanced the modulus and toughness (46 MJ m −3 ) of the UV cured elastomer. Finally, the resin is used as a component in SLA-based 3D printing transforming the elastomeric resin into complex 3D structures.
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PubMed
高影响因子
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