DYES AND PIGMENTS
·
2019
·
IF 4.018
Yan Zhou,Qiang Ma,Erik B. Berda,Xincai Liu,Ce Wang,Danming Chao
The electrochemical manipulation of optical properties will be essential in engineering next generation intelligent displays, wearable devices , and smart sensors . The rational design of electrochemically-modulated optical materials, especially those with multiple regulatory capacities, remains an unmet research challenge. We present here an optical composite, featuring multiple electrochemically-modulated properties, prepared through an electrochemistry-assisted hydrolytic crosslinking reaction between electroactive viologen and fluorescent carbon dots . Upon the electrochemical manipulation of the redox states of the viologen moieties, the resultant composite film exhibits interesting multistage regulated chromism with great color contrast, moderate switching rates, good coloration efficiency, and enhanced cycling stability. We demonstrate a unique sequential multistage regulated electrofluorochromism resulting from the inner filter effect and synergistic interplay between the electroactive viologen units and the fluorescent carbon dots. Furthermore, this optical composite reveals electrogenerated chemiluminescence with acceptable electrochemiluminescence intensity, attributed to the intrinsic behavior of carbon dots.
研究领域:
材料科学
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电化学
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光学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 41
·15451-15457
·
IF 8.067
Xi-Zhu Zhang,Wen-Jing Zhu,Zhong-Xi Yang,Yi Feng,Lin-Lin Fan,Guang-Gang Gao,Hong Liu
The sensitive and selective detection of ethylenediamine (EDA) has great significance due to its threat to environment and human health. Herein, a rationally designed polyoxometalate–viologen complex (1) has been demonstrated, in which the viologen molecules are hydrogen bonded to Dawson-type polyoxoanions. When complex 1 is in the atmosphere of EDA, the chromic intensity or Raman signals present proportional response to EDA concentrations. In particular, a very low detection limit of 0.1 ppb can be obtained for 1 based on its Raman signal output, which is the most sensitive complex than the reported EDA sensors. Also, high selectivity is observed for 1 when other amine molecules coexist as interfering compounds. According to the structural analysis and comparative experimental results, the highly sensitive and selective chromic or Raman response can be ascribed to the existence of viologen in the crystal lattice, which can not only accept electrons from EDA but also effectively accelerate the electron transfer to polyoxometalate. This work affords a novel concept for the design of highly sensitive and dual response polyoxometalate-based sensors by virtue of viologen-boosting electron transfer.
研究领域:
材料科学
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环境科学
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化学传感器
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jiaqi Xu,Zongcai Deng,Bo Wu,Meijin Lin,Dongyang Chen
Organic polymers containing redox-active moieties have attracted increasing attention as electrode materials for high-performance rechargeable batteries due to their sustainability, flexibility, environmentally benign, and high stability. Herein, viologen functionalized fluorene-containing poly(arylene ether ketone)s (MV-FPAEKs) were synthesized by polycondensation , bromination, and quaternization in sequence. 1 H NMR was used to monitor the degree of functionalization (DF), which increased with the increasing of the molar ratio of the bromination agent. The MV-FPAEK-96 with a DF of 96% for viologen was used as the active material for polymer cathode. The theoretical specific capacity was calculated to be 87.6 mAh g −1 based on the dual electron transfer per viologen unit. It had been found that the MV-FPAEK-96 battery delivered a discharge specific capacity of 87.1 mAh g −1 at a current rate of 0.1 C, and maintained 32.1 mAh g −1 after 100 galvanostatic cycles. In contrast, the small molecule of dimethyl viologen was highly soluble in the electrolyte, and the corresponding capacity decreased to negligible values after only 20 cycles. Therefore, the attachment of viologen to polymeric backbones is an effective strategy to increase the stability in electrolyte while maintaining the rechargeability, and the MV-FPAEK-96 is a promising redox-active candidate for polymer batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 9
·1515
·
IF 5.3
Mengyu Fu,Dongzi Xu,Xiaoxia Liu,Yuji Gao,Shenghong Yang,Huaifeng Li,Mingming Luan,Pingping Su,Nianxing Wang
Semiconductive photocatalytic materials have received increasing attention recently due to their ability to transform solar energy into chemical fuels and photodegrade a wide range of pollutants. Among them, cadmium sulfide (CdS) nanoparticles have been extensively studied as semiconductive photocatalysts in previous studies on hydrogen generation and environmental purification due to their suitable bandgap and sensitive light response. However, the practical applications of CdS are limited by its low charge separation, which is caused by its weak ability to separate photo-generated electron-hole pairs. In order to enhance the photoelectrochemical activity of CdS, a polymer based on viologen (PHV) was utilized to create a series of PHV/CdS hybrid films so that the viologen unit could work as the electron acceptor to increase the charge separation. In this work, various electrochemical, spectroscopic, and microscopic methods were utilized to analyze the hybrid films, and the results indicated that introducing PHV can significantly improve the performance of CdS. The photoelectrochemical activities of the hybrid films were also evaluated at various ratios, and it was discovered that a PHV-to-CdS ratio of 2:1 was the ideal ratio for the hybrid films. In comparison with CdS nanoparticles, the PHV/CdS hybrid film has a relatively lower band gap, and it can inhibit the recombination of electrons and holes, enhancing its photoelectrochemical activities. All of these merits make the PHV/CdS hybrid film as a strong candidate for photocatalysis applications in the future.Keywords:CdS nanoparticles;viologen;photoelectrochemical redox materials;hybrid films
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Small
·
2023
·
IF 13.3
Jing Cuan,Hui Zhou,Xuefang Huang,Xinhang Cong,You Zhou
Developing smart materials capable of solid-state multicolor photoluminescence (PL) switching in response to multistimuli is highly desirable for advanced anticounterfeiting. Here, a ternary MOF hybrid showing hydro-photo-thermo-responsive multicolor PL switching in the solid state is presented. This hybrid is constructed by co-immobilizing Eu 3+ and methyl viologen (MV) cations within an anionic MOF via the cation-exchange approach. The confined guest cations are well arranged in the framework channels, facilitating the synergistic realization of stimuli-responsive multiple PL color-switching through intermolecular coupling. The hybrid undergoes a rapid and reversible PL color-switching from red to blue upon water simulation, which is achieved by activating the blue emission of the framework linker while simultaneously quenching the Eu 3+ emission. Furthermore, the hybrid displays photo-thermo-responsive PL switching from red to dark. UV-light irradiation or heating triggers the chromic conversion of MV to its colored radical form, which exhibits perfect spectral overlap with Eu 3+ , thus activating Förster resonance energy transfer (FRET) from Eu 3+ to MV radicals and quenching the Eu 3+ emission. Inspired by these results, PL morse patterns are designed and fabricated using a novel triple-level encryption strategy, showcasing the exciting potential of this hybrid in advanced anticounterfeiting applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2019
·
IF 4.018
Sixuan Xiao,Yujie Zhang,Long Ma,Shan Zhao,Nan Wu,Debao Xiao
In this paper, 1,1′-bis (2-sulfonatoethyl) viologen (SEV) and 1,1′-bis (3-sulfonatopropyl) viologen (SPV) as chromophore were synthesized and used to fabricate hydrogel-based electrochromic devices . The electrochromic hydrogel, consisting of SEV (or SPV), water, sodium carboxymethylcellulose and 1,1′-ferrocenedimethanol, was employed to fabricate all-in-one electrochromic devices. The proposed SEV/SPV-based hydrogel electrochromic devices have satisfactory coloration efficiency up to 304 cm 2 /C, response times below 3 s and driving voltages below −0.8 V. Surprisingly, SEV-based hydrogel and SPV-based hydrogel electrochromic device showed high cycling stability, attenuating 2% after 10000 cycles and attenuating 1% after 8000 cycles, respectively. The easy-to-make process for device and outstanding electrochromic properties of the hydrogel containing SEV and SPV make it promising to achieve environmentally benign electrochromic devices for smart windows and so forth.
研究领域:
材料科学
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电化学
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光电
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 157
·期 8
·
IF 4.304
Chen Zhongwei,Liu Yang,Gong Shaokuan,Zhang Zixuan,Cao Qinxuan,Mao Lingling,Chen Xihan,Lu Haipeng
Low-dimensional metal halide perovskites are attracting extensive attention due to their enhanced quantum confinement and stability compared to three-dimensional perovskites. However, low dimensional connectivity in the inorganic frameworks leads to strongly bounded excitons with limited absorption properties, which impedes their application in photovoltaic devices. Here, we show that, by incorporating a strong electron accepting methylviologen cation, charge transfer (CT) at the organic/inorganic interface can effectively tune the optical properties in one-dimensional (1D) lead–halide perovskites. Both 1D MVPb 2 I 6 and MVPb 2 Br 6 display expanded absorption and photoresponse activity compared to CT inactive cations. The photoinduced CT process in MVPb 2 I 6 was further characterized by transient absorption spectroscopy, which shows an ultrafast CT process within 1 ps, generating charge separated states. Our work unveils the interesting photophysics of these unconventional 1D perovskites with functional organic chromophores.
研究领域:
材料科学
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光物理学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xuyi Li,Chen Huang,Yu Fan,Zhiang Bai,Bao-Li An,Jiaqiang Xu,Weiwei Zheng,Yue-Ling Bai
A new strategy is developed herein to improve the solid fluorescence of thiazolothiazole viologen by using the ZnCl42– cluster as a scaffold to hinder π-stacking. Importantly, the Cl···H bonds are formed in the solid state to sustain the framework and can be automatically dissociated when dissolved in H2O, thus having no impact on the strong emission in aqueous solution. As such, the first case of organic–inorganic viologen–zinc halide named 4PV·ZnCl4 was designed and synthesized, and a significant increase in photoluminescence quantum yield (ΦF) is realized from 4PV·2Br (ΦF = 0%) to 4PV·ZnCl4 (ΦF = 27.0%) in solid and from 97% to 98% in H2O. 4PV·ZnCl4 also displays pH stimuli-responsive naked-eye chromic behavior and photoluminescence with different coloring states and intensities. The multifunctional performance of 4PV·ZnCl4 provides a prerequisite for carrying different information, expanding their promising application in multilevel information encryption.
研究领域:
化学
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材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Wan-Xiong Yong,Wei-Ning Liu,Xiao-Ying Xin,Guo-Dong Fu
In recent years, smart windows that provide energy-efficient solutions for the construction and transportation sectors have attracted considerable interest as a result of increasingly severe environmental issues. Electrochromic windows have emerged as a prominent option because of their high coloring efficiency and broad optical modulation range. However, traditional electrochromic devices necessitate the use of an external electric field to operate, which not only increases energy consumption but also poses safety risks. In this study, we propose a novel self-powered electrochromic smart window that utilizes the principles of self-charging batteries to achieve optical modulation across a wide spectrum of visible light. This device utilizes viologen derivatives as electrochromic materials due to their highly reversible redox reactions and the ease with which their colors can be manipulated. The devices can exhibit three distinct display states, transitioning from colorless or pale yellow to blue, purple, and green, by varying the types of viologen derivative electrochromic materials employed. Notably, simply disconnecting the zinc anode from the conductive glass cathode enables the self-recovery of the electrochromic state, thereby restoring the initial transmittance level. This recovery takes place as the viologen cation radical spontaneously oxidizes to form the divalent ion; a process facilitated by oxygen dissolved within the gel electrolyte. The device not only features a multicolor display and efficient optical modulation but also demonstrates excellent cycle stability and safety. Consequently, the smart window presented functions as a multifunctional device, serving both as an electrochromic window and an energy storage unit. This innovative self-powered multicolor display device significantly broadens the application scope of electrochromic smart windows. It achieves not only the shading effect of optical modulation but also meets the energy-saving and flexible design needs in the fields of architecture and transportation, thereby providing opportunities for further applications in the new energy industry.
研究领域:
材料科学
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能源技术
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环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 45
·19902-19907
·
IF 3.288
Huan Ling,Hongbo Dai,Fengyu Su,Yanqing Tian,Yan Jun Liu
A transparent-to-gray electrochromic device (ECD) based on an asymmetric viologen was fabricated and characterized. The core material derived from novel bipyridine salt (named 1-(2-(diethoxy-phosphoryl)ethyl)-1′-(4-vinylbenzyl)-[4,4′-bipyridine]-1,1′-diium chloride bromide, DVB) combined with complementary species of ferrocene was assembled in a device with a simple configuration of ITO/EC solution/ITO. The device was first converted to blue color from transparent when 1.0 V was applied, and then neutral gray color when the potential bias was increased to 2.0 V. Meanwhile, the corresponding optical contrasts (ΔT) were 54.5% and 22% at 392 nm and 605 nm, respectively. In addition, a good coloration efficiency of 128.9 cm2 C−1 at 2.0 V and fast switching time (<2.5 s) were obtained. Finally, satisfied stability with 43.8% of ΔT (maintaining 80% of initial ΔT at 392 nm) was achieved after 2000 cyclic processes, which paves a new way to design colorless to neutral color ECDs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Agricultural Science & Technology
·
2022
·
IF 0
Guang Li,Siyun Zhang,Lei Yang,Weiwei Xu,Haonan Qu,Demei Tian,Jia Li,Haibing Li,Xiaobing Zhang
Controlled release of pesticides is highly desirable for improving efficacy and reducing side effects in agricultural applications. Herein, in this work, based on the optical property and host–guest chemistry of quantum dot and pillararene, we develop a new type of fluorescent, current-responsive, pH stimuli-responsive pillar[6]arene@quantum dots mixed-matrix membranes (PQDs-MMMs) for pesticide delivery, which achieves highly selective detection and controlled release for methyl viologen (MV2+). In the experiments of fluorescence spectrum and I–V current, PQDs-MMMs could realize the visual fluorescence detection and current selection for MV2+. Moreover, the controlled release experiments indicated that the PQDs-MMMs could effectively immobilize and stimuli-release the MV2+ depending on the pH regulation, which achieved the pH-stimuli-responsive release of MV2+. Additionally, the herbicidal activity of MV2+-loaded PQDs-MMMs (MV2+@PQDs-MMMs) was tested, and results showed the weed control effects were identified to free MV2+ under pH control. This work provides the great potential of PQDs-MMMs used in agricultural membranes with environmentally friendly and stimuli-responsive release.
研究领域:
农业科学
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材料科学
·
化学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jinxu Zhao,Qijun Chen,Ying Zhou,Jianming Zheng,Chunye Xu
The poor electrochemical reversibility of the dimers limits the application of viologens in aqueous electrochromic devices (ECDs). Here, we report a tetramethyl viologen, 2,2′,6,6′-tetramethyl-4,4′-bipyridine hydrobromide ([MVH][Br]), in which tetramethyl substitution provides significant steric hindrance to prevent dimerization. Our experiments show that this designed viologen performs excellently in an aqueous solvent, including excellent color variation, optical modulation, cycling stability, and radical inertness. Typically, an aqueous ECD fabricated with the viologen is able to retain 95.48% of its optical modulation after 5000 cycles. Furthermore, we found that this viologen is impervious to UV polymerization. Based on this property, we demonstrate a bichromatic ECD based on a hydro-ionic hybrid gel using in situ UV polymerization. This study not only extends the application of viologens in aqueous ECDs but also paves the way for the future development of high-mechanical-performance hydrogel-based ECDs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）