Nanoscale
·
2019
·Vol. 11
·期 39
·18496-18500
·
IF 6.97
Yunxia Wang,Jibo Tang,Shunping Zhang,Hongxing Xu,Tao Ding
Plasmon-assisted optical growth significantly improves the controllability of polymerization on the nanoscale, which greatly facilitates the fabrication of nanodevices and their integration. Traditional approaches for nanodevices strongly rely on nanofabrication techniques, which involve complicated multi-steps and expensive instrumentation. Here, we build photoelectric nanoswitches by precisely implanting photoelectric active polymers, polypyrrole, into metallic bowtie nanogaps via charge transfer induced oxidative polymerization, which show conductivity up to 4 μS m−1 with an optical switching response time of ∼50 ms. We further demonstrate their photoelectric switchability with different laser powers, wavelengths and amounts of polypyrrole in the gaps. This plasmon-assisted optical growth strategy not only provides a facile and accurate means to control the polymerization process, but also greatly expedites the fabrication of nanodevices and their integration.
研究领域:
纳米技术
·
光子学
·
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Peipei Du,Jinghui Li,Liang Wang,Jing Liu,Shunran Li,Nian Liu,Yuxuan Li,Muyi Zhang,Liang Gao,Ying Ma,Jiang Tang
Perovskite light-emitting diodes (PeLEDs) have drawn great research attention because of their outstanding electroluminescence performance by solution processing. PeLEDs made by thermal evaporation are relatively rarely explored but are compatible to existing organic light-emitting diode industrial lines. Blue-emitting PeLEDs are all based on organic-containing perovskites, rather than more stable all-inorganic perovskites because of their poor solubility, too fast crystallization, uneven discrete films, and unattainable pure blue emission. Here, we report all-inorganic, vacuum-processed blue PeLEDs. High-throughput combinatorial approaches are employed to optimize Cs–Pb–Br–Cl composition in our dual-source co-evaporation system to achieve the balance between film photoluminescence and injection efficiency. The as-deposited perovskite films demonstrated excellent intrinsic stability against heat, UV-light, and humidity attack. A series of PeLEDs were obtained covering the standard blue spectral region with a best luminance of 121 cd/m2 and an external quantum efficiency of 0.38%. We believe that the vacuum processing strategy demonstrated here provides a very promising alternative way to produce efficient and stable all-inorganic blue-emitting PeLEDs.
研究领域:
材料科学
·
光电工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shaobo Ji,Fuqiang Fan,Chenxing Sun,Ying Yu,Huaping Xu
Plasticity of thermoset polymers has been realized by introducing exchangeable bonds, and the plasticity is mostly triggered via heat or UV light. Visible light is a relatively mild trigger that has not been used to induce plasticity in polymer materials. Herein, thermoset polyurethanes (PUs) containing diselenide bonds are fabricated that possess visible light-induced plasticity along with shape memory behavior. A series of PUs with different diselenide bond contents were tested and their shape memory properties and plasticity varied. With a higher diselenide bond content, both shape memory and light-induced plasticity are achieved. By combining these two properties, reshaping the permanent shapes of the PUs is easier. Compared with heat or UV light, visible light has the advantage of spatial control. For instance, a pattern of visible light was introduced by a commercial projector to demonstrate facile reshaping of the materials. Because visible light can be introduced via various methods, PUs with visible light-induced plasticity have great potential applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 3
·464
·
IF 4.324
Sizhe Hu,Kai Jiang,Yuci Wang,Sui Wang,Zhongjun Li,Hengwei Lin
Carbon dots (CDs) with a room temperature phosphorescent (RTP) feature have attracted considerable interest in recent years due to their fundamental importance and promising applications. However, the reported matrix-free RTP CDs only show short-wavelength (green to yellow) emissions and have to be triggered by ultraviolet (UV) light (below 400 nm), limiting their applications in certain fields. Herein, visible-light-excited matrix-free RTP CDs (named AA-CDs) with a long-wavelength (orange) emission are reported for the first time. The AA-CDs can be facilely prepared via a microwave heating treatment of L-aspartic acid (AA) in the presence of ammonia and they emit unique orange RTP in the solid state with visible light (420 nm) excitation just being switched off. Through the studies of the carbonization process, the C=O and C=N containing moieties in the AA-CDs are confirmed to be responsible for the observed RTP emission. Finally, the applications of AA-CDs in information encryption and anti-counterfeiting were preliminarily demonstrated.Keywords:carbon dots;room temperature phosphorescence;visible-light-excitation;anti-counterfeiting
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yanbiao Shi,Xiaobing Wang,Xiufan Liu,Cancan Ling,Wenjuan Shen,Lizhi Zhang
We demonstrate that visible light irradiation can promote Fe 3 S 4 Fenton oxidation of atrazine. The visible light irradiation could increase the atrazine Fenton degradation rate by 4.9 times. The enhanced atrazine degradation activity under visible light was attributed to the higher surficial Fe(II)/Fe(III) ratio of Fe 3 S 4 and the efficient surface iron redox cycle triggered by visible light. Experimental results revealed that the operando formation of FeOOH on the Fe 3 S 4 surface blocked the iron redox cycle and inhibited the H 2 O 2 decomposition, accounting for the largely decreased Fenton activity of Fe 3 S 4 in dark, while these problems were successfully solved by the introduction of visible light irradiation, which excite Fe 3 S 4 to produce abundant photo-generated electrons and O 2 − for efficient regeneration of active Fe(II) species of Fe 3 S 4 and in-situ formed FeOOH.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 36
·期 2
·1800362
·
IF 4.384
Wenxu Yin,Xue Bai,Xiaoyu Zhang,Jia Zhang,Xupeng Gao,William W. Yu
Molybdenum disulfide (MoS 2 ) quantum dots (QDs) are known for their excitation-wavelength-dependent photoluminescent (PL) properties. However, the mechanism of this phenomenon is still unclear. Here, small size MoS 2 QDs with a narrow size distribution are synthesized. Based on the decay study and PL dynamics, a reasonable radiation model is presented to understand the special PL properties, i.e., the carrier recombination in the localized surface defect states generated the PL. Accordingly, this optical property is used to fabricate multicolor light-emitting devices with the same MoS 2 QDs. The emission color covers the full visible spectrum from blue to red, only by adjusting the thickness of the down-conversion QD layers.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2024
·
IF 6.1
Wenxue Li,Siyuan Chen,Shiwang Xie,Xianmao Lu,Zhou Li,Yujia Lv,Dan Luo
Bacteriorhodopsin is a biological material with excellent photosensitivity properties. It can directly convert optical signals into electrical signals and is widely used in various biosensors. Here, we present a bR-based wearable pH biometer that can be used to monitor wound infection. The mechanism of the pH-sensitive effect of the bR electrode is explained, which generates a transient photovoltage under light irradiation and a negative photovoltage when the lamp is turned off. Since the photoelectric signal of bR is affected by different pH values, the photovoltage is changed by adjusting the pH value. The ratio (Vn/Vp) of negative photovoltage (Vn) to positive photovoltage (Vp) has a good linear relationship (R2 = 0.9911) in the pH range of 4.0–10.0. In vitro experiments using rats as a model confirmed that this wearable pH biometer can monitor pH changes that occur in wound infection.
研究领域:
生物技术
·
生物工程
·
传感器
·
医疗器械
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Suqing Wu,Haiyang Hu,Yan Lin,Junliang Zhang,Yun Hang Hu
TiO 2 is widely exploited as a photocatalyst to degrade antibiotic residues in water under UV irradiation, but it is inefficient for visible light photocatalysis due to its large band gap. Herein, it is the first time to report the photodegradation of tetracycline (TC) over TiO 2 under visible light irradiation. 25.1% of removal efficiency for TC was achieved even under 700 nm light irradiation. Furthermore, it was demonstrated that O 2 − species, which were generated from photoexciting of a surface complex between TC molecules and TiO 2 , played a critical role in the visible light photocatalytic degradation of TC. In addition, it was found that the visible light photocatalytic degradation generated different active species and intermediate products from those under UV irradiation. N-doped TiO 2 exhibited even better performance for visible-light photocatalytic degradation of TC with higher removal efficiency and larger mineralization rate, which followed different degradation-mechanism.
研究领域:
环境科学
·
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Guizhen Yu,Qingyu Niu,Xiao Liu,Liang He,Jinxie Yu,Hang Han,Wenjing Wang,Ying Zhang,Zhiqiang Li,Qingqing Xiong
In this work, hybrid anisotropic hydrogel is developed through dispersing carbon quantum dots , ultrahigh magnetic nanoparticle-coated alumina (Fe/Al 2 O 3 ) platelets in acrylamide aqueous solution in the assistance of magnetic field, then fix the oriented structure via gelation . The aligned Fe/Al 2 O 3 platelets result in formation of anisotropic structure, thus endows the hydrogels mechanical anisotropy and fluorescent anisotropy. White-light emission is obtained via varying the weight ratio of yellow-emitting ZnO QDs and blue-emitting N,S-CDs. This strategy not only enriches the mechanical/fluorescent dual anisotropic soft materials, but also have great potential application in the fields of organic light-emitting diodes, nonlinear optics and field effect transistors .
研究领域:
材料科学
·
光电技术
·
纳米技术
·
软物质物理
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2018
·Vol. 5
·期 3
·313-317
·
IF 3.173
Min Lu,Hua Wu,Xiaoyu Zhang,Hua Wang,Yue Hu,Vicki L. Colvin,Yu Zhang,William W. Yu
Graphical Highly flexible red light-emitting diodes were fabricated by using smooth Ag film as a cathode, photopolymer (NOA63) as a flexible substrate and CsPbI 3 perovskite nanocrystals as an emission layer, exhibiting a high color purity and EQE of 8.2%. The device has excellent flexibility and high mechanical robustness. The superior optical and electrical properties of perovskite nanocrystals (NCs) make them attractive for light-emitting diodes (LEDs). However, making stable flexible LEDs still remains a big challenge. Here, highly flexible CsPbI 3 perovskite LEDs were fabricated using a photopolymer as the substrate, and an ultra-smooth Ag films instead of ITO as the bottom electrode. Moreover, the device electron injection was also improved with Ag electrode. The flexible LEDs exhibited excellent electroluminescence characteristics with a low turn-on voltage of 2.0 V and an external quantum efficiency of 8.2%. In addition, the flexible LEDs maintained their good performance after 1000 times of repeated 180 degree stretch-release bending.
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
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiulin Shen,Fu Li,Zhonghuan Cao,David Barat,Guoli Tu
Here we demonstrate a simple and effective method of fabricating polymeric scattering substrate for flexible organic light-emitting diodes (OLEDs) that require no costly patterning, etching, or molding processes, aspects that are desirable for the commercialization of large-scale lighting panels. Systematic study of the influences of relative index of refraction, particle size, and doping concentration on transmittance and haze of transparent colorless polyimide (cPI) films was carried out. It was found that the reduction of transmittance and haze of the doped films decreases along with the decrease of the difference of refractive index between the particles and polymer matrix, and it could be compensated by the increase of particle size or doping concentration.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Mi Zhang,Xiaobing He,Jie Wei
In this paper, we have developed a paper-based optical imaging material responding to visible light. This material consists of a thioxanthone (TX) derivative with the additional phenyl carbazole chromophore, namely 1-phenyl-11,12a-dihydrothiochromeno (3,2-b) carbazol-13 (5H)-one (TX-PC), and leuco crystal violet (LCV). TX-PC is newly synthesized and characterized by 1 HNMR, FTIR and high-resolution mass spectrometer. As a visible light absorbing Type II photoinitiator, TX-PC has an excellent absorption property in the visible region in the absence of an added co-initiator. In other words, TX-PC degrades into lively free radicals when irradiating under visible light which resulting in a color reaction on LCV . The degree of reaction is characterized by UV–vis spectrophotometer. In this study, this material is used for imaging within visible light because of the high efficiency color reaction. We coat a paper substrate with this TX-PC/LCV solution and cover with a pattern photomask. Under the irradiation of the visible light, color reaction occurs to irradiated area while the rest remains colorless. Thus the two areas are distinguished to obtain a clear image as same as the original version.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）