JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 36
·期 1
·1-8
·
IF 2.8
Shan Zhang,Xin Song,Xing Gao,Chunxiao Lu,Pei Han,Yunying Liu,Xiaowei Li,Junyan Zhang,Yong Li
The ferroelectric photovoltaic (PE-PV) effect has been extensively explored and plays a crucial role in constructing self-powered photodetectors. Ferroelectric materials have been attracting great interest in self-powered ultraviolet (UV) photodetectors due to their polarization-induced photovoltaic effect. In this paper, the ultraviolet self-powered photodetection properties of polycrystalline rare-earth Yb 1-x Ho x MnO 3 (0 ≤ x ≤ 0.08, Δx = 0.02) ferroelectric materials have been investigated. The substitution of Ho atoms for Mn atoms has a great influence on the ferroelectric polarization, and Ho doping increases the photocurrent density. The photodetectors show excellent reproducibility responsivity (R) and detectivity (D*) under illumination at 365 nm. In addition, at the light density of 1 mW/cm 2 , the responsivity and detectivity of the photodetectors are as high as 0.09 W/A and 3.359 × 10 11 Jones, respectively. These outstanding photodetection performances are due to the relatively high short-circuit current density ( J sc ). High J sc implies that more photogenerated carriers can be produced under illumination, which makes the device more sensitive to optical signals. This study presents a feasible method for improving the light-detection performance of the ultraviolet self-powered detector.
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高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Yuliya E. Tyutereva,Olga A. Snytnikova,Dmitriy G. Sheven,Roman G. Fedunov,Vadim V. Yanshole,Vyacheslav P. Grivin,Ivan P. Pozdnyakov
Mechanism of direct UV photolysis of the zwitterionic and anionic forms of the quinolone antibiotic ciprofloxacin (CIP) was revealed by combination of nanosecond laser flash photolysis, steady-state photolysis coupled with high resolution LC-MS and DFT quantum-chemical calculations. For both forms, the main intermediate is a dissociative triplet state, which loses a fluorine ion to form a triplet carbocation; subsequent solvent attack of the latter leads to the formation of products of hydroxylation both the aromatic ring and the piperazyl substituent. Correspondingly, the quantum yield of photolysis of both CIP forms does not depend on the excitation wavelength, but depends on the concentration of dissolved oxygen. Secondary photolysis leads to a number of products of oxidation of the aromatic system, as well as oxidation, opening and full destruction of the piperazinyl substituent. The results obtained may be important for understanding the fate of quinolone antibiotics in UVC disinfection processes and in natural waters under the action of sunlight.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Yujie Qi,Haoqi Zhai,Xing Huang,Mengquan Shi,Yuxi Zhang,Yuxia Zhao
As the largest renewable source of aromatic feedstock in nature, lignin has good thermal stability, strong ultraviolet (UV) absorption, and mechanical reinforcing property. In this study, a lignin-based Type I macromolecular photoinitiator (macro PI) named DAL-11ene-TPO is designed and synthesized through covalently grafting 10-undecenoyl chloride (11ene) and 2,4,6-trimethylbenzoyl-ethoxy-phenylphosphine oxide (TPO-L, a commercial small molecular PI) into dealkaline lignin (DAL) skeleton. A series of characterizations were performed to prove that DAL-11ene-TPO was synthesized successfully, including 1 H NMR, FTIR, UV–vis, 31 P NMR, GPC (gel permeation chromatography). The formed active free radicals were monitored by electron spin resonance (ESR). DAL-11ene-TPO can high-efficiently initiate the monomers polymerization upon the irradiation of 405 nm LED. The resulting polymer films showed strong UV-blocking performance and good visible light transmittance. Moreover, the elongation at break of the polymer film containing 0.5% DAL-11ene-TPO is improved by 50% compared with that of TPO-L control group. Furthermore, DAL-11ene-TPO has polymerizable groups, which can be bonded into the network of the polymers, resulting in a high biosafety of the end products. The results indicate that DAL-11ene-TPO can be used as a high-efficient bio-based macro PI for preparing high performance UV-blocking films.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jia Jia,Rong-Kun Liu,Qian Sun,Jie-Xin Wang
ZnO nanoparticles with high safety and stability are often used as active ingredients in sunscreens to protect the skin from ultraviolet rays. However, ZnO nanoparticles are easy to agglomerate, which will significantly affect the ultraviolet absorption and bacteriostatic properties, and the reactive oxygen species induced by the photocatalytic activity may result in irreversible secondary damage to the skin. Herein, the ZnO nanoparticles are dispersed uniformly on the surface of latex particles, and these composite particles are used as shell materials to construct self-assembled colloidosomes by high-gravity technology, which can improve the application properties with synergistic enrichment of the hollow structure. The ultraviolet resistance of colloidosomes is significantly higher than that of the pure ZnO nanoparticles. The higher the loading capacity, the more obvious the inhibition effect of colloidosomes on the growth of Gram bacteria. Furthermore, the antioxidant anthocyanin is in situ encapsulated in colloidosomes, and at a concentration of 2 g/L, the high free radical scavenging rate of 78% can be achieved. The construction of multifunctional colloidosomes provides a route for sunscreen and cosmetics applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Yan Zhou,Changhong Lin,Yuming Yang
Herein, PVDF membranes with excellent UV-absorbing property were first synthesized through grafting the polymerizable low-molecular-weight organic UV-absorber 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone (BPMA) onto α-bromoester-functionalized PVDF membranes via the surface-initiated activator generated by electron transfer atom transfer radical polymerization (SI-AGET ATRP). The surface initiators were immobilized by the reaction between 2-bromoisobutyryl bromide (BIBB) and the hydroxylated PVDF membranes. PVDF-g-PBPMA membranes with different grafting densities were obtained by tuning the polymerization time and the modified membranes were characterized by 1 H-NMR, FT-IR, XPS, SEM, UV–vis Spectrophotometer, TGA and DSC. The experimental results indicated that PBPMA chains were successfully introduced onto PVDF membranes. Most importantly, the PVDF-g-PBPMA membranes exhibited outstanding UV-shielding property. UV–vis transmittance spectra showed that most UV light below 360 nm could be absorbed by PVDF-g-PBPMA membranes and the whole UV light region (200–400 nm) can be blocked with the reaction time increased.
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ADVANCED ENGINEERING MATERIALS
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2025
·
IF 3.3
Lai Wei,Jing Li,Shuai Zhang,Kai Fu,Ning Li,Zhanwen Zhang
This study systematically investigates the ultraviolet-assisted direct ink writing (UV-DIW) process, focusing on the influence of critical parameters, including UV intensity, the ratio of printing speed to ink extrusion rate ( v P / v E $v_{P} / v_{E}$ ), and relative nozzle height ( H / h ), on filament fusion and structural morphology. The rheological behavior of photosensitive resin ink is analyzed, revealing that UV irradiation induces a fluid-to-solid transition critical for shape retention and structural integrity. The results demonstrate that UV intensity plays a pivotal role in controlling filament fusion, with insufficient curing causing filament sagging and excessive fusion, while higher UV intensities improve structural fidelity. Additionally, printability (Pr), calculated from cross-sectional analysis, is used as a quantitative metric to assess filament fusion quality and structure preservation. Parameter phase diagrams are developed to visually map the relationships among printing variables, providing a framework for optimizing UV-DIW conditions. The successful fabrication of dense solid blocks without filament interfaces highlights the potential of UV-DIW for producing high-quality, defect-free 3D structures. This work provides valuable insights into parameter tuning, paving the way for advanced applications in manufacturing, biomedical engineering, and material science.
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DENTAL MATERIALS
·
2024
·
IF 4.6
Xuedong Bai,Mengxiao Xu,Shixin Jin,Edmond H.N. Pow,Yanning Chen,James K.H. Tsoi
Objectives To proof the feasibility of direct colour printing on 3Y-TZP using 222 nm UV-C through investigating the degree and durability of the colour changes, and testifying whether surface, mechanical and biological properties are influenced by the treatment. Methods 222 nm UV-C light (Irradiance: 1.870 mW/cm 2 ) was used to treat 3Y-TZP for durations from 15 min to 24 h. ΔE*, TP, crystalline structure, surface morphology, S a , BFS and biological activities were investigated before and after irradiation. SPSS 28.0 was used for statistical analysis (α = 0.05). Results 222 nm UV-C irradiation was capable to shade white 3Y-TZP into tooth colours. With the increase of ΔE*, TP decreased, such that the longer the irradiation time, the higher the ΔE* (logarithmic relationship) and lower the TP. Despite the induced optical changes being prone to fade, the process can be predicted by inversely proportional relationships between ΔE*, TP and the testing points. The treated surface exhibited enhanced hydrophilicity, while the recovery phenomenon was observed. Other properties were not altered by the treatment. Significance This is the seminal study demonstrating the feasibility of direct colour printing on 3Y-TZP using 222 nm UV-C. The new relationship between the colour centre and E g of 3Y-TZP was established, whereas the induced optical changes were stabilised after a certain period and were highly predictable by controlling the irradiation periods. The irradiation was only correlated to the electron excitation and oxygen vacancies, and would not lead to any changes of other properties. A simple, safe and promising approach to achieve satisfactory colours on 3Y-TZP in clinical practice can be developed.
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NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 18
·9762-9768
·
IF 3.269
Rui Chen,Ting Li,Qi Zhang,Zhongyang Ding,Piming Ma,Shengwen Zhang,Mingqing Chen,Weifu Dong,Weihua Ming
We synthesized two reactive quaternary ammonium methacrylate compounds (QAC-10 and QAC-12) bearing hydrophobic tails with different alkyl chain lengths. Cross-linked films with excellent antimicrobial properties were obtained from a mixture of a polyurethane acrylate prepolymer and a reactive QAC via one-step UV curing. The QAC-containing films showed total kill against both Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus epidermidis (S. epidermidis) at QAC-12 concentrations as low as ∼2.5 wt% relative to the polyurethane acrylate prepolymer, which was substantially lower than the QAC amount needed in the films containing QAC-10 with a shorter hydrocarbon tail (C10H21). Compared with the QAC-10-containing films, the higher antimicrobial potency in the QAC-12-containing films was the consequence of the longer hydrophobic alkyl tail (C12H25), which offered a stronger driving force for the surface enrichment of the QAC and, thus, greater surface charge density (the longer tail may also penetrate the cell membrane more easily due to stronger hydrophobic interactions). A zone of inhibition test confirmed that the antimicrobial effect of these films was on the basis of contact killing and there was no leaching of antimicrobial species from the cross-linked films.
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高影响因子
SOFT MATERIALS
·
2025
·
IF 1.4
Weimin Yan,Chengmin Hou,Chenyu Li
Ultraviolet curing (UV) water-based ink has the advantages of low viscosity, high gloss, and wide application range. However, there are some defects such as slow curing speed and low cross-linking degree. In this paper, the copolymer p(GMA-r-AA) was prepared via traditional radical polymerization using glycidyl methacrylate (GMA) and acrylic acid (AA) as monomers, and then p(GMA-r-AA) was modified by 2-hydroxyethyl methacrylate (HEMA) to obtain acrylic prepolymer P(GMA-r-AA)-g-HEMA with double bonds. Triethylenetetramine reacted with GMA to obtain a multifunctional reactive diluent triethylenetetramine hexamethacrylate glycidyl amide (TGMA). Fourier transform infrared (FTIR) spectroscopy combined with hydrogen nuclear magnetic resonance spectroscopy (1H NMR) was used to characterize the structures of the prepolymer P(GMA-r-AA)-g-HEMA and the reactive diluent TGMA. Three ingredients were needed to prepare UV curable ink: photoinitiator, multifunctional reactive diluent (TGMA), and acrylic prepolymer P(GMA-r-AA)-g-HEMA. The effects of the mass fraction and relative molecular weight of P(GMA-r-AA)-g-HEMA, the type and mass fraction of the photoinitiator, the number of functional groups, and the mass fraction of TGMA on the UV ink curing speed and wear resistance of the ink film were discussed. At a mass fraction of 1% for the photoinitiator TPO, the mass fraction of the reactive diluent was 55% with 4 functional groups, and the prepolymer had an average relative molecular mass of 5.63 × 104 g/mol. The UV water-based ink completed curing in 0.1 s, and the mass loss abrasion was 2–5% after 50 times. Finally, the UV ink was used to prepare UV conductive magnetic ink. The UV conductive and magnetic ink can be cured into a film in 0.1 s, no peeling phenomenon, with good magnetic properties.
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npj Materials Degradation
·
2024
·Vol. 8
·期 1
·1-12
·
IF 6.6
Xi Le,Lv Yadong,Feng Jiabao,Huang Yanyan,Huang Yajiang,Yang Qi,Li Guangxian,Kong Miqiu
Due to their excellent mechanical properties and intrinsic flexibility, polyimides (PIs) are promising candidates for optoelectrical applications under harsh conditions such as flexible organic solar cells as well as flexible smart windows, etc. Much progress has been made on their optical transmittance; however, there remain significant concerns about their environmental stability, particularly their UV resistance. Herein, 4 types of colorless polyimides (CPIs) with different molecular structures containing trifluoromethyl, ethers, or fluorenes are carefully designed, and the dependence of their UV resistance on structures is explored systematically. It is found that the introduction of isopropylidene, ethers and fluorenes effectively enhances the UV resistance of CPI and its initial performance (optical transparency, thermal stability, and toughness) simultaneously as a result of the subtle manipulation of the conjugation structures. Specifically, the optimized polyimide film shows decent optical properties ( \({T}_{550{\rm{nm}}}\) ~ 88%, yellowness index ~3.26), and thermal stability ( \({T}_{5 \% }\) ~ 503 °C in N 2 atmosphere, \({T}_{{\rm{g}}}\) ~ 312 °C). Moreover, after high-intensity UV irradiation, CPI not only maintains over 90% of mechanical properties but also retains excellent optical properties ( \({T}_{550{\rm{nm}}}\) ~ 88%) and thermal stability ( \({T}_{5 \% }\) ~ 506 °C). The design strategy paves the way for enhancing the durability of PIs for energy conversion and electronic applications resisting harsh conditions.
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POLYMER
·
2025
·
IF 4.5
Tao Zhang,Zijia Liu,Yonghui Lu,Yenan Wang,Lipu Zhu,Shutong Zhang,Chuanxi Wang,Wenqiang Chen,Junbao Zhang,Guoliang Bai,Wenshuo Zhang
The functional integration of multiple molecules into polymeric materials by covalent cross-linking is a promising strategy. Here, we report a double crosslinked aqueous polyureaurethane prepared by the introduction of curcumin and dithiodiphenylamine into the castor oil-isophorone diisocyanate system. The results show that the bicovalent crosslinking system promotes microphase separation, leading to tunable mechanical properties from flexible to rigid. Since the π→π∗ transition of curcumin is preserved, The CSWPU film achieves 100 % shielding efficiency against short-wavelength light (<500 nm) while maintaining optical transparency, and exhibits rapid self-healing via a dynamic disulfide exchange mechanism with a healing efficiency of 91 %.The denser cross-linking network also improved thermal stability. This work establishes a sustainable paradigm for the design of multifunctional polymers through rational molecular cross-linking.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 22
·2313776
·
IF 18.5
Fapeng Sun,Haojie Xu,Wenting Hong,Zhihua Sun,Wei Liu
Metal thio(seleno)phosphates are renowned for their multifaceted physical characteristics and versatile applications, particularly in optoelectronics. In detection applications, a low and stable dark current is crucial, enhancing the sensitivity and signal-to-noise ratio of detectors. Herein, a van der Waals layered material has synthesized, CuInP 2 Se 6 . Despite its nanometric scale, 2D CuInP 2 Se 6 detector transcends the conventional absorption inefficiencies tied to ultrathin materials. It delivers exceptional ultraviolet–visible detection, characterized by an ultralow, stable dark current of 150 fA, and a noise power density of 27.7 fA Hz −1/2 at room temperature. The in-depth investigation reveals a responsivity of 4.47 A W −1 , an external quantum efficiency of 1369%, a special detectivity of 1.44 × 10 13 Jones, and a rapid response speed of 280 µs, positioning it at the pinnacle of 2D photodetector performance. The CuInP 2 Se 6 ’s ultralow, stable dark current paves the way for X-ray detection, achieving an unprecedented sensitivity of 1.32 × 10 5 µC Gy air −1 cm −2 and a low detection limit of 0.15 µGy air s −1 . Furthermore, 2D CuInP 2 Se 6 detector exhibits a remarkable image-sensing capability, adeptly capturing intricate patterns with high resolution. This discovery indicates its promise in revolutionizing integrated micro/nano optoelectronic devices, opening avenues for advancements in light and X-ray detection and imaging technologies.
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