SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Bing Han,Ruixiang Ma,Haihua Wang,Mi Zhou
Charge-transfer complexes (CTC) exhibit promising application in scientific field. A prototype CTC (TTF-TCNQ), formed by charge donating (tetrathiafulvalene) and charge accepting (tetracyanoquinodimethane) molecule, was systematically studied by Raman method. By combining Raman and synchrony X-ray diffraction (XRD), we investigated the high-pressure structures of TTF-TCNQ up to 15 GPa, and did not observe any first-order phase transition. Finally, a detailed evolution of structure for TTF-TCNQ, versus pressure, is provided, offering a new pathway to investigate the structural stability of CTC.
研究领域:
材料科学
·
物理学
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产品关联
DOI
PubMed
高影响因子
Frontiers of Optoelectronics
·
2022
·Vol. 15
·期 1
·1-10
·
IF 0
Jiang Mengjia,Li Shuyu,Zhen Chun,Wang Lingsong,Li Fei,Zhang Yihan,Dong Weibing,Zhang Xiaotao,Hu Wenping
Simultaneously realizing the optical and electrical properties of organic materials is always challenging. Herein, a convenient and promising strategy for designing organic materials with integrated optoelectronic properties based on cocrystal engineering has been put forward. By selecting the fluorene (Flu) and the 7,7′,8,8′-tetracyanoquinodimethane (TCNQ) as functional constituents, the Flu-TCNQ cocrystal prepared shows deep red emission at 702 nm, which is comparable to the commercialized red quantum dot. The highest electron mobility of organic field-effect transistor (OFET) based on Flu-TCNQ is 0.32 cm 2 V −1 s −1 . Spectroscopic analysis indicates that the intermolecular driving force contributing to the co-assembly of Flu-TCNQ is mainly charge transfer (CT) interaction, which leads to its different optoelectronic properties from constituents. Graphical Abstract
研究领域:
材料科学
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光学
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电子工程
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DOI
PubMed
Micromachines
·
2023
·Vol. 14
·期 5
·941
·
IF 3.4
Qiuping Li,Nuan Wen,Wu Zhang,Liansheng Yu,Jinghui Shen,Shuxian Li,Yuguang Lv
g-C3N4and g-C3N4/TCNQ composites with different doping levels were prepared using the copolymerization thermal method with melamine as a precursor. XRD, FT-IR, SEM, TEM, DRS, PL, and I-T characterized them. The composites were successfully prepared in this study. The photocatalytic degradation of pefloxacin (PEF), enrofloxacin (ciprofloxacin), and ciprofloxacin (ciprofloxacin) under visible light (λ > 550 nm) showed that the composite material had the best degradation effect on PEF. When TCNQ doping is 20 mg and catalyst dosage is 50 mg, the catalytic effect is the best, and the degradation rate reaches 91.6%, k = 0.0111 min−1, which is four times that of g-C3N4. Repeated experiments found that the cyclic stability of the g-C3N4/TCNQ composite was good. The XRD images were almost unchanged after five reactions. The radical capture experiments revealed that ·O2−was the main active species in the g-C3N4/TCNQ catalytic system, and h+also played a role in PEF degradation. And the possible mechanism for PEF degradation was speculated.Keywords:TCNQ;graphite phase carbon nitride;pefloxacin;photocatalysis
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
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2018
·Vol. 29
·期 13
·135502
·
IF 3.404
Xiufeng Wu,Wenbo Lu
It is highly attractive to construct stable enzyme-free glucose sensors based on three-dimensional direct electrochemical detection of glucose. In this paper, a copper 7,7,8,8-tetracyanoquinodimethane (Cu(TCNQ)) nanorod array on Cu foam (Cu(TCNQ) NA/CF) is proposed as an efficient catalyst for electrochemical glucose oxidation in alkaline conditions. When Cu(TCNQ) NA/CF was used as the enzyme-free sensory of glucose, the sensor showed a response time within 3 s, a wide linear detection in the range 0.001–10.0 mM, the minimum limit of detection was as low as 10 nM (S/N = 3), and it had a high sensitivity of 26 987 μA mM−1 cm−2. Moreover, this sensor also possesses long-term stability, high selectivity, reproducibility, and actual applications for fresh human serum sample analysis is also successfully accepted.
研究领域:
生物传感技术
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材料科学
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分析化学
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DOI
高影响因子
SYNTHETIC METALS
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2021
·
IF 3.266
Jiaoyan Shi,Lipeng Wu,Qingya Sun,Fan Wu,Aming Xie
Elemetal doping is an efficient strategy to adjust the microstructue and electronic property of a carbon material, as a result, shows great potential in the design of novel electromagnetic absorption (EMA) materials. In this work, we report an useful strategy to prepare a N,S co-doped carbon (NSC) using TTF-TCNQ as the precusor, and systematically explore its frequency-depedent dielectric and EMA properties. Different N/S ratios can be tuned by the regulation of pyrolitic temperature. The derived NSC exhibits wonderful EMA performance when the pyrolytic temperature is setted to 700 ℃ with loading ratio of 35 wt%. Efficient absorption can be achieved in the frequency range of 6.4–18 GHz. Moreover, it is determined that the efficient absorption bandwidth gets to 6.5 GHz, while the maximal absorption reaches −46 dB. The EMA mechanism of NSC is considered to be mainly contributed by improved impedance matching realized by macropores, enhanced conductance loss caused by well constructed condutive network, and polarization by N,S doping. This research provides a new idea for development of novel carbon materials for EMA applicaion.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 47
·475406
·
IF 3.551
Fengzhi Wang,Weisheng Lei,Xinhua Pan,Zhizhen Ye
Graphitic carbon nitride (g-C3N4) has been regarded as an intriguing photocatalyst applying to hydrogen generation but suffering rapid recombination of photoinduced electron-hole pairs and insufficient absorption under visible light. We developed a novel one-pot thermal copolymerization method of melamine as a precursor and 7,7,8,8-tetracyanoquinodimethane (TCNQ) as a comonomer to synthesize modified g-C3N4 (abbreviated as X% TCNQ) for the first time, aiming to directly incorporate TCNQ molecular into carbon nitride skeleton for the substitution of low-electronegative carbon for high-electronegative nitride atom. Results revealed that the as-prepared photocatalysts by copolymerization of melamine with TCNQ retained the original framework of g-C3N4, and dramatically altered the electronic and optical properties of carbon nitride. Various measurements confirmed that as-synthesized samples exhibited larger specific surface areas, faster photogenerated charge transfer and broader optical absorption by decreasing the π-deficiency and extending the π-conjugated system, thus facilitating the photocatalytic activity. Specifically, the 0.3% TCNQ exhibited as high as seven times than the pristine g-C3N4 on photocatalytic H2 generation and kept its photoactivity for five circles. This work highlights a feasible approach of chemical protocols for the molecular design to synthesize functional carbon nitride photocatalysts by copolymerizing appropriate g-C3N4 precursor and comonomers.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 10
·期 34
·20110-20117
·
IF 3.119
Fengzhi Wang,Weisheng Lei,Xinhua Pan,Bin Lu,Zhizhen Ye
Photocatalytic hydrogen evolution by water splitting has become a very effective way to solve the energy crisis. For use in that process, graphitic carbon nitride (g-C3N4) has drawn much attention for its response in the visible region. However, its insufficient sunlight absorption efficiency and easy recombination of photoinduced carriers restrict its photocatalytic activity. Herein, we demonstrate a two-step liquid ultrasonic method in water to synthesize a series of tetracyanoquinodimethane (TCNQ)–C3N4 photocatalysts aiming to form a conjugated structure by 7,7,8,8-TCNQ. g-C3N4 was treated with APTES firstly on its surface in order to give a better interface contact with TCNQ. Benefiting from the conjugation effect between TCNQ and g-C3N4, the separation and transport efficiency of photogenerated carriers were significantly improved. Besides, introducing TCNQ also broadened the absorption region. Both of these points lead to the enhancement of photocatalytic H2 production rate, with the optimized 5% TCNQ–C3N4 giving a rate nearly 9.48 times that of pure g-C3N4. Also, 5% TCNQ–C3N4 (U) was prepared with unmodified g-C3N4, which exhibited a rate only 6.87 times that of pure g-C3N4, thus validating the necessity of surface modification. Our work reveals that the rational conjugated structure could modulate the electrical and optical properties of g-C3N4, yielding an improvement of photocatalytic activities.
研究领域:
材料科学
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能源科学
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化学工程
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DOI
PubMed
高影响因子
Nano Research
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2023
·Vol. 16
·期 12
·13366-13374
·
IF 9.9
Lin Chaoxin,Kim Kumchol,Wang Zuochao,Yan Zhuang,Tang Zhiyong,Liu Yaling
Integration and synergy of the unique functions of different components have been developed into one of the most convenient and effective ways to construct the composite advanced materials with collective properties and improved performances. In this work, the mace-like tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ)/HKUST-1 composite structures with single single-crystalline TTF-TCNQ submicrorods covered by ordered HKUST-1 nanosheet arrays were successfully constructed by an efficient TTF-TCNQ seed-mediated growth approach. Impressively, thanks to the synergetic and complementary effects between TTF-TCNQ and HKUST-1, the sensors based on such mace-like TTF-TCNQ/HKUST-1 composite structures not only displayed an experimental detection limit of 10 part per billion (ppb) for NO 2 detection, but also exhibited outstanding selectivity even if the concentration of the interfering gases was 10 times that of NO 2 . Meanwhile, good reproducibility and rapid response were also achieved. This work opens the avenue for creation of novel high-performance sensing materials for application in gas sensing.
研究领域:
材料科学
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化学传感
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纳米技术
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气体传感器
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DOI
高影响因子
Energy Storage Materials
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2021
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IF 17.789
Yun Zhong,Yankai Li,Jintao Meng,Xing Lin,Zhimei Huang,Yue Shen,Yunhui Huang
7,7,8,8-tetracyanoquinodimethane (TCNQ) is a low-cost redox active organic compound which has high theoretic specific capacity. But when it is used as cathode material in batteries , it always suffers from fast performance decaying because of material dissolution. In this work, Al 3+ salt is added in a Na 2 SO 4 /ZnSO 4 aqueous electrolyte to stabilize the crystalline structure of TCNQ and depress its solubility. Surprisingly, we found the insertion/extraction of high valent cations (Al 3+ and Zn 2+ ) in TCNQ is highly reversible, which leads to synergistic improvement of both specific capacity and cycle life. The obtained cathode exhibits a reversible capacity of 245.8 mAh g -1 at 0.5 A g -1 and a cycle-life of 1000 rounds at 3 A g -1 . Our work demonstrates that molecular organic electrode materials are very different from conventional inorganic cathode materials in terms of high valent cation intercalation reversibility. Adding high valent cation salts is a simple and effective way to enhance the electrochemical performance of molecular organic electrode materials, and consequently build low cost, high performance aqueous rechargeable batteries.
研究领域:
储能
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电化学
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材料科学
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水系电池
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有机电极材料
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2019
·
IF 1.795
Qing-Qing Huang,Yang-Jie Lin,Rui Zheng,Wei-Hua Deng,Chiranjeevulu Kashi,P. Naresh Kumar,Guan-E Wang,Gang Xu
Metal-organic frameworks (MOFs) are a kind of functional porous materials with the potential applications in gas adsorption and separation, catalysis, energy storage, sensor, and electrical conductivity . However, the insulating nature of the mostly MOFs limits their application in the electronic field. A new three-dimensional (3D) metal-organic framework composed of Cu 2+ centres and polyacid linkers (TATAB 3− ) was synthesized by solvothermal method , which contains two types of Cu 24 cages. The crystal structure is cubic and each Cu is coordinated by five oxygen atoms which can be confirmed by the single crystal X-ray diffraction, infrared spectra and TGA analysis. The conductivity for this 3D MOF is increased by four orders of magnitude after doping with 7,7,8,8-tetracyanoquinodimethane (TCNQ) and realizes the transformation from an insulator to semiconductor.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Yuanyuan Wang,Dawei Yang,Heng Zhang
Although high-performance quantum-dot light-emitting diodes (QLEDs) have been achieved, their stability is still limited due to the use of unstable PEDOT:PSS as the hole injection layer (HIL). Here, we developed a PEDOT:PSS-free QLED by using a binary PTAA:F4-TCNQ HIL. Because the PTAA, with a highest occupied molecular orbital (HOMO) level of ∼5.20 eV, can facilitate hole injection from ITO to the hole transport layer, and the F4-TCNQ can act as the electron acceptor dopant to improve the hole density and hole mobility of PTAA, the PTAA:F4-TCNQ HIL can exhibit excellent hole injection capability. As a result, the PEDOT:PSS-free QLED can exhibit a high EQE of 24.19% and an impressive brightness of 367,200 cd/m2, which are significantly higher than those of conventional QLEDs. Moreover, due to the improvement of device performance and the removal of PEDOT:PSS, the PEDOT:PSS-free QLED can also exhibit a high T95 operational lifetime of 4206 h at 1000 cd/m2 and an excellent T80 shelf lifetime of 207.41 h at 136400 cd/m2, which are about 1.6- and 3.3-fold those of conventional QLEDs, respectively. We believe that the demonstrated PEDOT:PSS-free QLED, with higher performance and stability, will promote the practical application of QLEDs in displays.
研究领域:
材料科学
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电子工程
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显示技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Xuanyu Wang,Han Zhong,Xuanling Liu,Jianfei Yang,Ziling Zhang,Jiazheng Su,Jinxian Lee,Han Wang,Qiang Luo,Hong Lin
Modifying the surfaces of photocatalysts with organic cocatalysts is effective in promoting the photosynthesis of hydrogen peroxide (H 2 O 2 ), a versatile oxidant and environmentally benign fuel. Although the configuration of organic molecules dictates their properties and performance, it has not been discussed in organic-cocatalyst-modified photocatalysts. Herein, in order to study this potential influence on H 2 O 2 photosynthesis, we have managed to prepare tetracyanoquinodimethane (TCNQ)-modified silver thiogallate (AgGaS 2 ) nanoclusters with two different surface configurations via an active photodeposition strategy pioneered in this work (T/A-light) and a conventional stirring-adsorption process in the dark (T/A-dark). It has been confirmed that TCNQ adopts an end-on configuration and serves as a surface-coordinated molecular cocatalyst with a surface charge-transfer doping effect in T/A-light, whereas it takes a face-to-face geometry and establishes a heterojunction in T/A-dark. Moreover, T/A-light displays better light absorbance, oxygen adsorption and activation, H 2 O 2 selectivity, and photocatalytic activity with small amount of TCNQ (ω(TCNQ)); while its performance is overtaken by T/A-dark as ω(TCNQ) increases via multilayer adsorption which further strengthens interfacial electric fields and facilitates the charge separation and H 2 O 2 desorption. The highest production rate reaches 2.11 mmol g −1 h −1 , which is nearly four times that of pristine AgGaS 2 and better than that of most counterparts. This work has shed light on the configuration-dependent performance of organic cocatalysts and concurrently expanded the concept and application of photodeposition, offering a significant insight into designing high-performance surface-modified photocatalysts.
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DOI
高影响因子
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