Polymers
·
2022
·Vol. 14
·期 22
·4965
·
IF 4.967
Zipeng He,Haoran Xu,Yuhang Zhang,Yanjun Hou,Haijun Niu
Four new multifunctional polymers (P1, P2, P3, and P4) containing EDOT units were synthesized by the Stille coupling reaction. A PL spectrum test found that the introduction of large conjugated groups led to strong fluorescence emission in all polymers. Among the electrochromic and switch properties, these polymer films exhibited reversible color changes, as well as good coloring efficiency. Electrochemical experiments found that the initial oxidation potentials of the polymers were 1.27 V, 1.67 V, 1.78 V, and 1.58 V, respectively. Among them, P3 showed a higher coloring efficiency (283.3 cm2·C−1), and P2 showed a shorter response time (tc= 2.2 s, tb= 2.8 s). These polymers all exhibited electrochromic and resistive switching storage characteristics. They have good solubility in many organic solvents. In the resistance switch memory characteristics, all polymers had obvious memristive properties, and P4 exhibited a larger switch current ratio (2527.42) and a smaller threshold voltage (0.9 V).
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 29
·期 10
·e202202915
·
IF 5.02
Jing Zhang,Jinqiu Chen,Bo Yang,Shuang Ma,Lina Yin,Zhiqi Liu,Wenxin Xiang,Hongguang Liu,Jianfen Zhao,Peng Sheng
Graphical New DCAF based charge transfer cocrystals with tunable energy level, crystal morphology and fluorescence emission were prepared via a cocrystal engineering method. Organic donor-acceptor complexes as new organic semiconductor class have attracted wide attention, due to their potential applications in functional optoelectronics. Herein, we present two new charge transfer cocrystals of di-cyanodiazafluorene -perylene (DCPE) and di-cyanodiazaflfluorene-pyrene (DCPY) through a rational cocrystal-engineering strategy. Although they are both 1 : 1 mixed stacking cocrystals with similar chemical structures, the DCPE cocrystal possesses a non-centrosymmetric space group and narrower band gap compared to DCPY cocrystal, because of the non-covalent bonding variation. The electrostatic potential accumulated in the lateral facets leads to highly twisted DCPE nanobelts, and the small band gap causes near infrared fluorescence. Meanwhile, the DCPY crystals with centrosymmetric space groups and weaker intermolecular interactions exhibited an untwisted morphology and red emission. This study will be helpful for the design and understanding of functional cocrystal materials that can be used in flexible micro/nano-mechanics, mechanical energy, and optical devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
iScience
·
2022
·
IF 6.107
Yuan-Jun Tong,Lu-Dan Yu,Yanjun Huang,Yutong Li,Nan Li,Qi Fu,Yu-Xin Ye,Fang Zhu,Janusz Pawliszyn,Jianqiao Xu,Gangfeng Ouyang
Carbon quantum dots (CQDs) are highly promising to be applied in light-emitting, chemosensing, and other cutting-edge domains. Herein, we successfully fabricate high-quality full-color CQDs under unprecedentedly low temperature and pressure (85°C, 1.88 bar). Stable and narrow fluorescent emissions ranging from blue to green and red light were realized by simple amine engineering, which were further mixed into white-light CQDs with the absolute photoluminescent quantum yield reaching 19.2%. The average mass yield of the CQDs reached 69.0%. The optical performances demonstrated that the CQDs possessed uniform luminescent centers and dominant radiative decay channels. Component analysis further suggested that dehydrated condensation between carboxyl and amine groups directed the growth of the CQDs. By utilizing the CQDs, full-color light-emitting diodes and logic gate sensors were developed. This study paves an important step for promoting the application of CQDs by providing an energy-efficient, safe, and productive synthetic strategy.
研究领域:
材料科学
·
化学工程
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 15
·3745-3751
·
IF 4.696
Yu Cang,Rui Zhang,Guixin Shi,Jianchao Zhang,Lixiao Liu,Xiaoyan Hou,Zhenchuan Yu,Dingye Fang,Xuhong Guo
In this work, we demonstrated a facile and environmentally friendly method of preparing water-soluble cadmium sulfide (CdS) quantum dots (QDs) immobilized in spherical polyelectrolyte brushes (SPBs). The synthesis included three stages as follows: preparation of SPBs, introduction of Cd2+ by the ion-exchange process and in situ fabrication of CdS in SPBs. The X-ray diffraction (XRD) pattern and the transmission electron microscopy (TEM) images proved that the CdS nanocrystallines (NCs) were cubic in structure and well distributed in SPBs. The size and photoluminescence (PL) emission of hybrid nanoparticles (SPB@CdS) could be tailored by adjusting some parameters, such as pH of SPBs, the ratio of Cd/S, the temperature of reaction and dimensions of SPB@CdS. For instance, upon increasing the pH value of SPBs and the ratio of Cd/S, the trap emission of CdS NCs could be transformed into band-edge emission. And the PL emission shifted from 490 to 580 nm as the reaction temperature increased from 10 to 90 °C. More interesting was that the PL emission of SPB@CdS could be quenched and recovered reversibly by pH adjustment due to the pH sensitive chains of poly(acrylic acid) grafting from the polystyrene core. The SPB@CdS displayed excellent photochemical stability in visible light above pH 10 which provided a possibility for storing QDs in visible light. In addition, this simple method can be extended to other sulfide fabrication in SPBs, such as ZnS, which has also been successfully embedded in SPBs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Peng Ren,Xiaodong Chen,Luetao Sun,Quanqian Lyu,Lianbin Zhang,Jintao Zhu
Invisible photonic patterns (IPPs) are photonic materials that can display hidden patterns under external stimulation and are attractive in anti-counterfeiting devices and information storage. In this work, we report a solvent-responsive invisible photonic pattern (SRIPP) with high contrast by polymerizing two monomers of acrylamide (AAm) and poly(ethylene glycol) methacrylate (PEGMA) with different solubility parameters in different regions of poly(hydroxyethyl methacrylate) photonic gels. The two regions with different solvent responsiveness can shrink and swell in the same environment, thus causing the colors of different regions of photonic gel to shift in opposite directions from the initial state. As a result, the contrast of photonic patterns is significantly improved, increasing naked-eye visualization. In addition, by introducing fluorescent substances into the photonic gel and adjusting the photonic band gap (PBG) of photonic gels, we realize the regulation of fluorescence emission and display of fluorescence patterns by utilizing different PBGs on the SRIPP. Dynamic solvent responsiveness patterns and fluorescence patterns are integrated into a photonic gel, showing great potential in information storage and multiple-mode anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5946-5954
·
IF 2.1
Lu Yuting,Bian Zhenglan,Chu Fenghong,Lu Jianwei,Hou Guoqiang,Hou Shili
In this paper, a hydrothermal strategy is reported for the synthesis of nitrogen-doped carbon dots (NCD) which used citric acid (CA) and urea as reactants with different pristine molar ratios of carbon/nitrogen atoms (C/N). The fluorescence emission wavelength of the aqueous solutions of NCD can be tuned from 462 to 546 nm under a single and uniform UV light excitation (365 nm). Through many characterization analysis methods, it is demonstrated that graphitic N and C=O extended the effective conjugation length which reduced the energy gap between the highest occupied molecular orbital (HUMO) and the lowest unoccupied molecular orbital (LUMO). This is considered to be responsible for the redshift and tunability of the fluorescence emission of NCDs with different C/N molar ratios. This will be useful for designing a synthetic strategy of long-wavelength fluorescence emission carbon dots (CDs) in a non-benzene ring precursor system. As a potential fluorescence sensor, the as-prepared NCDs can specifically detect Fe 3+ ions and Al 3+ ions in aqueous solutions. Additionally, the NCDs not only are nontoxic but also exhibit large and stable fluorescence intensity, indicating that they have broad potential application in the fields of sensors and optoelectronic devices.
研究领域:
材料科学
·
分析化学
·
生物传感
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yuchao Fu,Wanxiang Li,Haochen Li,Meizhen Huang
Electro-Fenton (EF) process is a significant water treatment method for the degradation of dissolved organic matter (DOM) in water and has been widely studied and applied in the past decade to degrade various dissolved organics. During water treatment , in order to monitor the degradation efficiency, it is in dire need to develop rapid and accurate methods that are favorable to assay on-line and on-site to provide feedback in a timely manner. UV–Visible absorption spectroscopy and Excitation-Emission Matrix (EEM) fluorescence spectroscopy techniques are most potential to realize on-line DOM measurement, but the measurement accuracy is unsatisfactory because of the obligatory involvement of iron-containing interferents. This study aims to simplify the measurement system complexity while overcoming the effect of iron-containing interferents during the measurement. An intrinsic relationship between the measured DOM concentration and the ultraviolet absorption at λ 1 and the light intensities of the fluorescence emission at λ 2 is derived theoretically and proved, based on which the influence of iron ions and their complexes on the spectrum can be eliminated, thus the content of DOM in the Electro-Fenton process is accurately determined. The proposed dual wavelength analysis with combination of fluorescence emission and ultraviolet absorption spectroscopy can achieve high precision ( R 2 = 0.9882 , R M S E = 0.0131 m g / L ). Furthermore, the on-line measurement design, called ultraviolet absorption-fluorescence emission dual wavelength analyzer, only includes one ultraviolet LED and two photodetectors. Its structure is simple and suitable for on-line monitoring DOM in EF process.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2018
·
IF 2.377
Yuqing Ma,Yuyang Zhang,Lin Kong,Jiaxiang Yang
Five quinoline derivatives containing different alkyl chains ( QLACn , n = 2, 4, 6, 8, 12) were synthesized to investigate the effect of alkyl chains on their photophysical properties. The fluorescent properties of the QLACn were affected by the alkyl chains, which indicated obvious blue-shifting trend and fluorescence emission are alkyl chains length-dependent by grinding-induced spectral shifts (Δλ MFC ). Longer alkyl-length revealed larger Δλ MFC . Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) measurements indicated that the transformation between microcrystalline and amorphous states upon external stimuli should be responsible for the observed reversible MFC behavior.
研究领域:
材料科学
·
光物理学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2015
·
IF 3.966
Dehua Li,Alexis Munyentwali,Guang Wang,Meiduo Zhang,Shuangxi Xing
A dual-responsive amphiphilic diblock copolymer , poly(styrene- co -1-(2-methacryloxyethoxy)-2-(2-pyridyl)benzimidazole)- block -Poly( N -isopropylacrylamide- co -3-biphenyl-3-phenyl-8-methacryloxy-3 H -naphtho[2,1- b ]pyran- co -4-methamino-9-allyl-1,8-naphthalimide), also denoted as P(St- co -PBI)- b -P(NIPAM- co -NP- co -MANI), was synthesized by reversible addition fragmentation chain transfer polymerization followed by assembling into micelles with hydrophobic P(St- co -PBI) block as core and thermoresponsive P(NIPAM- co -NP- co -MANI) block as the shell in aqueous solution. Dynamic light scattering , transmission electron microscopy and optical transmittance were used to characterize the particle morphology and thermosensitivity of the micelles solution. In addition, the fluorescence emission of the micelles could be reversibly modulated “on” and “off” by the photochromic naphthopyran upon UV and thermal back reaction, which promoted naphthopyran transformation between merocyanine forms and original closed form. Moreover, the spatial distance between the two fluorescence dyes could be regulated by temperature, resulting from the collapse or extension of PNIPAM in aqueous solution. This property enabled the polymeric assemblies to serve as sensitive ratiometric fluorescent thermometers.
研究领域:
高分子化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2019
·Vol. 3
·期 6
·1105-1112
·
IF 0
Shuangxiong Dai,Zhengxu Cai,Zhe Peng,Zhi Wang,Bin Tong,Jianbing Shi,Shenglong Gan,Qiming He,Wei Chen,Yuping Dong
Aggregation-induced emission (AIE) overcoming the drawback of aggregation-caused quenching (ACQ) makes it possible to access the fluorescence emission of chromophores in the solid state. The development of AIE-active liquid crystals has attracted extensive attention in recent years. Herein, a series of novel (A–D–A)-type AIE-active dyes with different lengths of flexible alkyl chains based on pyrrolopyrrole cores were prepared. Among these compounds, TPPP-C1,2,3 with shorter alkyl chains possessed a more excellent AIE performance; however, they were unable to form a liquid crystalline (LC) phase. Upon increasing the length of alkyl chains, TPPP-C4,5,6,7,8,12 exhibited declining fluorescence emission efficiency in the aggregation states, and only TPPP-C6,7,8,12 with even longer alkyl chains exhibited the LC properties. Thus, all the nine TPPP compounds were AIE-active dyes, whereas TPPP-C6,7,8,12 were AIE-active liquid crystals. Polarized optical microscopy and differential scanning calorimetry experimental results indicated that the LC phases of the four AIE-active liquid crystals were only formed during the cooling process. However, once formed, the LC phases were very stable and could be retained for several months. This might be due to the freezing of intertwined alkyl chains during the cooling process; this was supported by grazing incidence wide-angle X-ray scattering measurements. The models of molecular organization in the LC states were built, and they showed well-organized lamellar structures.
研究领域:
材料化学
·
光学材料
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanzhen Yin,Wenhua Yang,Zhen Wang,Yue Zhang,Maochen Zhu,Chao Dou,Yang Che,Shijia Sun,Chen Hu,Bing Teng,Jiaqi Zhao,Jingyao Lu,Ruyi Sun,Degao Zhong
The struggle with "thermal load" is always an unavoidable challenge for photo-luminescent material. In this work, a novel red phosphor of ZnGa 2 O 4 : Eu 3+ with spinel-type structure is prepared by high-temperature solid-phase method. Due to the charge imbalance during the replacement processes of Ga 3+ →Zn 2+ and Eu 3+ →Zn 2+ in mixed spinel structure, vacancy defects can be introduced into the lattice structure of ZnGa 2 O 4 : 0.02Eu 3+ . The results of Density Function Theory (DFT) calculation demonstrate that the existence of vacancy defects can construct defect energy levels in the energy band structure of the host crystal, which can assist enhancing the fluorescence emission intensity of the phosphor at high temperature. The strong thermal stability of its own structure combined with the assistance of defect energy levels enables the achievement of zero-thermal quenching in ZnGa 2 O 4 : 0.02Eu 3+ under multi-wavelength excitation. Our results open up a new way for the exploration and utilization of zero-thermal quenching phosphors.
研究领域:
材料科学
·
发光材料
·
固态化学
·
计算材料学
·
无机功能材料
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 13
·2106863
·
IF 15.153
Jie Huang,Yeqing Chen,Pengpeng Rao,Zongming Ni,Xueying Chen,Jie Zhu,Chen Li,Gaoyang Xiong,Ping Liang,Xin He,Songnan Qu,Jun Lin
Carbonized polymer dots (CPDs) have received tremendous attention during the last decade due to their excellent fluorescent properties and catalytic performance. Doping CPDs with transition metal atoms accelerates the local electron flow in CPDs and improves the fluorescent properties and catalytic performance of the CPDs. However, the binding sites and the formation mechanisms of the transition-metal-atom-doped CPDs remain inconclusive. In this work, Mn 2+ -ion–doped CPDs (Mn-CPDs) are synthesized by the hydrothermal method. The Mn 2+ ions form Mn O bonds that bridge the sp 2 domains of carbon cores and increases the effective sp 2 domains in the Mn-CPDs, which redshifts the fluorescence emission peak of the Mn-CPDs slightly. The Mn 2+ ions form covalent bonds in the CPDs and remedy the oxygen vacancies of the CPDs, which cuts off the non-radiative–recombination process of the Mn-CPDs and increases the quantum yield of the Mn-CPDs to 70%. Furthermore, the Mn O bonds accelerate the electron flow between adjacent sp 2 domains and enhances the electron transport in the Mn-CPDs. Thus, the Mn-CPDs demonstrate excellent catalytic performance to activate hydrogen peroxide (H 2 O 2 ) and produce hydroxyl radicals (•OH) to degrade methylene blue (MB) and rhodamine B (RhB).
研究领域:
材料科学
·
纳米技术
·
催化
·
光化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）