Light-Science & Applications
·
2015
·Vol. 4
·期 12
·e364
·
IF 14.603
Qu Dan,Zheng Min,Li Jing,Xie Zhigang,Sun Zaicheng
Unlike inorganic quantum dots, fluorescent graphene quantum dots (GQDs) display excitation-dependent multiple color emission. In this study, we report N-doped GQDs (N-GQDs) with tailored single color emission by tuning π -conjugation degree, which is comparable to the inorganic quantum dot. Starting from citric acid and diethylenetriamine, as prepared N-GQDs display blue, green, and yellow light emission by changing the reaction solvent from water, dimethylformamide (DMF), and solvent free. The X-ray photoelectron spectroscopy, ultraviolet-visible spectra results clearly show the N-GQDs with blue emission (N-GQDs-B) have relatively short effective conjugation length and more carboxyl group because H 2 O is a polar protic solvent, which tends to donate proton to the reagent to depress the H 2 O elimination reaction. On the other hand, the polar aprotic solvent (DMF) cannot donate hydrogen, the elimination of H 2 O is promoted and more nitrogen units enter GQD framework. With the increase of effective π -conjugation length and N content, the emission band of N-GQDS red-shifts to green and yellow. We also demonstrate that N-GQDs could be a potential great biomarker for fluorescent bioimaging.
研究领域:
材料科学
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生物医学工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiabin Li,Haoran Guan,Shiyang Zhu,Bing Liu,Hongyan Yao,Shaowei Guan
Organic electrode materials demonstrate exceptional potential for sustainable rechargeable batteries due to their tunable structure, environmental friendliness and cost-effectiveness. However, their practical application in lithium-ion batteries (LIBs) is hindered by challenges such as limited capacity, poor intrinsic conductivity and significant dissolution issues in inorganic electrolytes. To address these challenges, a novel high-performance organic cathode material for LIBs, Polymeric ladder-type benzoquinone compound (PLBQ), was designed and synthesized in this work. The rational molecular design strategy imparts PLBQ with abundant active sites (C O and C N), enhancing its theoretical specific capacity. The electron-withdrawing nature of the redox-active sites (C O) and the extended π-conjugated structure lower the lowest unoccupied molecular orbital (LUMO) energy level and reduce the bandgap, thus increasing both the operational voltage and intrinsic conductivity of the PLBQ cathode. Additionally, the synergistic π–π interactions and hydrogen bonding impart remarkable solvent resistance to PLBQ, while simultaneously enhancing the stability of its molecular structure. As a result, the PLBQ cathode exhibited outstanding electrochemical performance, including long-term cycling stability (96 % capacity retention after 1000 cycles at 1 A g −1 ), excellent rate capability (101.3 mA h g −1 at 2 A g −1 ) and high reversible specific capacity (252.5 mA h g −1 at 0.1 A g −1 ). This work offers a novel molecular design strategy for the development of high-performance organic cathode materials for future lithium-ion batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 16
·5617-5623
·
IF 4.39
Dandan Wang,Xinyuan Zhang,Fei Liang,Zhanggui Hu,Yicheng Wu
Birefringent crystals can modulate and detect the polarization of light, and have been widely used in the field of optoelectronic devices. The combination of a d10 transition metal cation and π-conjugated (H2C3N3O3)− group is a feasible approach for the synthesis of new crystal structures possessing large birefringence and short cutoff edges. Herein, a new hydroisocyanurate birefringent material Zn(H2C3N3O3)2·3H2O (ZHCY) was synthesized by a mild hydrothermal method. ZHCY featured a 2D layered ribbon structure constituted by coplanar π-conjugated (H2C3N3O3)− hydroisocyanurates, and displayed a wide band gap (5.24 eV) and a large birefringence (Δnexp ∼ 0.323, Δncal = 0.283 at 800 nm). Theoretical calculations revealed that its optical properties mainly originated from the π-conjugate coplanar (H2C3N3O3)− groups, which contribute to the enhancement of birefringence.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 37
·17544-17550
·
IF 3.591
Zhen Chen,Hao Zeng,Shujuan Han,Zhihua Yang,Shilie Pan
The chlorine barium nitrate Ba(NO3)Cl was synthesized, for the first time to the best of our knowledge, by using a mild hydrothermal method. Its structure was observed to feature an ABW-type topology (BaCl-ABW) framework, which can be considered as stacks of honeycomb-shaped sheets. Also, Ba(NO3)Cl crystals with dimensions of up to 2 × 1 × 0.5 mm3 were grown. Remarkably, Ba(NO3)Cl was found to exhibit a short UV cutoff edge (below 213 nm) and a markedly enhanced birefringence (Δn = 0.178 @ 1064 nm), about 19 times that of its parent phase BaCl2 (Δn = 0.009 @ 1064 nm). Theoretical calculations indicated that the birefringence enhancement mainly derived from the planar [NO3] triangles.
研究领域:
材料科学
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晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 35
·16965-16973
·
IF 4.682
Wang Tao,Lu Yang,Xu Lin,Chen Zheng Jian
Surface-enhanced Raman scattering (SERS) has drawn attention to broad applications. Here, we investigate the SERS property of the π-conjugated poly(3-hexylthiophene-2,5-diyl) (P3HT) for molecule detection. The crystal structure of π-conjugated P3HT thin films is of the great significance to its SERS property. Our results show that the optimized crystal structure can significantly improve its SERS property. The SERS substrate has an excellent signal reproducibility (RSD < 10%). In addition, the SERS substrate still remains a good Raman enhancement after one year and shows excellent long-term stability compared with those of other types of SERS substrate. The result of our theory calculation shows that significant π-stacking of the probe molecules with the thiophene π-cores molecules plays an important role in the large SERS enhancement by the charge transfer mechanism. The increase in the crystallinity of the P3HT film can improve the charge transfer of the substrate molecules and the methylene blue (MB) molecules via more effective chemisorption of the probe molecules with the substrate molecules. The study contributed to the rational design of the organic semiconductor polymer SERS substrate with high sensitivity, selectivity, and long-term stability. Graphical abstract
研究领域:
材料科学
·
光谱学
·
有机化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hui Li,Xiaotao Hao,Bohong Chang,Zihao Li,Lian Wang,Lu Pan,Xihan Chen,Longwei Yin
Inorganic CsPbI2Br perovskites have witnessed incredible advances as a promising representative for translucent and tandem solar cells, but unfortunately, they are still plagued by serious energy losses and undesired phase instability. Herein, a new type of π-conjugated small molecule of 4-guanidinobenzoic-acid-hydrochloride (4-GBACl) is demonstrated to effectively cross-link the Pb-X framework of perovskites. The strong coordination between 4-GBACl and the [PbX6]4– octahedron of perovskites effectively stiffens the Pb-X framework to suppress the ion migration, thus stabilizing the perovskite phase structure against light and thermal conditions. Apart from the physical barrier for phase instability resulting from the hydrophobic benzene ring at grain boundaries (GBs), guanidinium cations and −COOH and Cl– groups can simultaneously afford the passivation of positively and negatively charged defects at the GBs and surface, including undercoordinated halide species and undercoordinated Pb2+ ions, thereby effectively inhibiting the charge trapping/recombination centers. Two-dimensional confocal-fluorescence mapping images provide a visualized sight into the significantly suppressed nonradiative recombination and the prolonged carrier lifetime. It is suggested that the 4-GBACl additive plays multiple roles in grain cross-linking to regulate crystallization, distinctly reducing the trap-state density, ion migration inhibition, and moisture barrier in CsPbI2Br films. Consequently, the 4-GBACl-treated device exhibits a champion power conversion efficiency (PCE) of 15.59% accompanied with a considerably improved Voc of 1.28 V and maintains 88% of the initial PCE value after 1200 h aging under 20% relative humidity.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Wubing Yao,Jiali Wang,Lili He,Dongdong Cao,Jianguo Yang
A ruthenium catalytic ortho-C–H diborylation of 2-arylpyridine derivatives, including challenging 2-phenoxypyridine functions, using a remarkably low catalyst loading and a low-cost and bench-stable boron source, has been developed. The novel strategy shows high activity with excellent selectivity and may offer a versatile and green alternative to currently employed high loadings of noble metals or extra additives for the selective borylations.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2015
·
IF 3.966
Shengbo Zhu,Zhongwei An,Xinbing Chen,Pei Chen,Qianfeng Liu
A series of cyclic thiourea functionalized dyes containing binary π-linkers were synthesized and applied in the dye-sensitized solar cells. The only difference of these dyes is that one segment of the binary π-linkers is thiophene , n -hexylthiophene, thienothiophene, 3,4-ethylenedioxythiophene, and benzene, respectively. Among them, the dyes incorporating electron-rich thienothiophene or 3,4-ethylenedioxythiophene exhibit the broader absorption bands and higher molar extinction coefficients in the visible region, which can not only enhance the light-harvesting ability but also improve the short-circuit current density; on the other hand, the dyes bearing bulky n -hexylthiophene or 3,4-ethylenedioxythiophene can effectively suppress the intermolecular π–π aggregation and electron recombination owing to larger steric hindrance , which is beneficial to increase the open-circuit voltage.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Dashui Yuan,Xueru Chen,Zongyuan Li,Cheng Fang,Jing Ding,Hui Wan,Guofeng Guan
Forming local micro-π conjugate connection units in the structure of carbon nitride (CN) at the interface to capture photo-generated electrons can reduce the band gap and simultaneously facilitate the charge transfer. Herein, the H 3 BTC/CN composites with benzene ring embedded structure were prepared through the acid-base reaction between H 3 BTC and melamine. The precursor reaction method effectively enhanced the dispersity and utilization efficiency of modification molecule. The introduced benzene ring of H 3 BTC increased the double bonds of π conjugated system , decreased the band gap and widened the response range of visible light. At the same time, benzene ring acted as the electron acceptor to capture photo-generated electrons and promote the effective separation of photo-generated charge carriers. The optimal catalyst, 7.5 wt% H 3 BTC/CN showed an enhanced photocatalytic hydrogen evolution rate of 301 μmol g -1 h −1 , which was 21.8 times higher than that of pure CN . The work manifested the positive impact of benzene ring embedding on CN structure and photocatalytic performance, which proposed a new strategy for the design and preparation of high-efficiency photocatalyst.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yinhua Qin,Xiaohang Qu,Boyue Huang,Dayu Sun,Haiyan Yin,Ming Ke,Ting Gao,Yuhang Liu,Ju Tan,Gang Li,Xunyi Guo,Youqian Xu,Chuhong Zhu
The seamless integration of bioelectronics with neural tissues is essential for regulating biological signal transmission and understanding complex physiological functions. However, conventional bioelectronic materials face significant limitations, including poor interfacial integration at the cellular level and a lack of controlled degradation, which hinders effective signal transduction and long-term biocompatibility. To address these challenges, a metabolically degradable π-conjugated conductive polymer, poly(pyrrole-3-carboxylic acid) (PPyCA) is developed and synthesized enzymatically under physiological conditions. The electron withdrawing group, carboxylic acids, reduced the electron cloud density of the pyrrole ring, enhancing the pyrrole ring affinity toward superoxide anion and thereby promoting controlled degradation. The resulting hydrophilic PPyCA has strong tissue affinity, forms seamless bioelectronic interfaces, and undergoes complete metabolic degradation within months. In vivo studies have demonstrated that enzymatically synthesized PPyCA microvesicles (MVs) not only facilitate neural signal transmission but also promote nerve regeneration following injury. Mechanistic investigations revealed that PPyCA upregulates c-FOS and related gene expression through the MAPK pathway, further supporting its role in nerve repair. Importantly, proteomic and metabonomic analyses confirmed the absence of cytotoxic effects. This study establishes a new paradigm for metabolizable electroactive polymers that enable seamless bioelectronic communication and programmed degradation, offering significant potential for biomedical applications.
研究领域:
生物医学工程
·
神经科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xue-Bo Liu,Rui Zhao,Min-Min Xu,Shang-Xiong Wei,Xue-Feng Cheng,Jing-Hui He
The electrochemical reduction of nitrate to ammonia (NO3RR) provides a desired alternative of the traditional Haber–Bosch route for ammonia production, igniting a research boom in the development of electrocatalysts with high activity. Among them, molecular electrocatalysts hold considerable promise for the NO3RR, suppressing the competing hydrogen evolution reaction. However, the complicated synthesis procedure, usage of environmentally unfriendly organic solvents, and poor stability of Cu-based molecular electrocatalysts greatly limit their employment in NO3RR, and the development of desired Cu-based molecular catalysts remains challenging. Herein, a simple nonorganic solvent involving a one-step strategy was proposed to synthesize d−π-conjugated molecular electrocatalysts metal–amidinothiourea (M-ATU). Cu-ATU is composed of Cu coordinated with two S and two N atoms, whereas Ni-ATU is formed by Ni with four N atoms from two ATU ligands. Remarkably, Cu-ATU with a Cu–N2S2 coordination configuration exhibits superior NO3RR activity with a NH3 yield rate of 159.8 mg h–1 mgcat–1 (−1.54 V) and Faradaic efficiency of 91.7% (−1.34 V), outperforming previously reported molecular catalysts. Compared to Ni-ATU, Cu-ATU transfers more electrons to the *NO intermediate, effectively breaking the strong sp2 hybridization system and weakening the energy of N═O bonds. The increase in free energy of *NO reduced the energy barriers of the rate-determining step, facilitating the further hydrogenation process over Cu-ATU. Our work opened up a new horizon for exploring molecular electrocatalysts for nitrate activation and paved a way for the in-depth understanding of catalytic behaviors, aligning more closely with industrial demands.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 5
·1534-1544
·
IF 4.495
Xin Shan,Guifang Ge,Zhongkui Zhao
Graphical All-round talent ! Pyridinium alkaline ionic liquid serves as an all-rounder to fabricate graphitic carbon nitride with nitrogen defects (nitrogen vacancies and cyano groups) and extended π-conjugated system, generating a highly efficient photocatalyst for solar hydrogen production under visible light irradiation with 1284 μmol h −1 g −1 (λ>420 nm) of hydrogen evolution rate (13.6 times higher than that of bulk g-C 3 N 4 ) and 4.2 % of apparent quantum efficiency at 420 nm. Semiconductor photocatalytic hydrogen evolution from water splitting using solar energy is one of the most potential strategies for settling the energy crisis, but a bottleneck is occurred in developing a highly efficient photocatalyst. Herein, we successfully fabricated a tubular g-C 3 N 4 with nitrogen defects (including both nitrogen vacancies and cyano groups) and extended π-conjugated system, wherein the nitrogen defects and extended π-conjugated system were conveniently introduced during thermal polymerization of the pyridinium alkaline ionic liquid-modified hydrogen-bonding melamine-cyanuric acid supramolecular (PHMCS) pre-aggregates towards carbon nitride with hexagonal cylinder morphology formed by the pyridinium alkaline ionic liquid-assisted hydrothermal process of low-cost melamine, in which the added trace pyridinium alkaline ionic liquid serves as an all-rounder with three roles including the promoting agent towards the transformation of melamine to cyanuric acid for constructing PHMCS, nitrogen defects making agent, and the electronic-tuning agent regarding of the as-formed carbon nitride. The tubular structure enhances the light scattering and improves the accessibility of active sites. Meanwhile, the high charge transfer efficiency, broad optical absorption region, and suitable energy band positions are related to both the introduction of nitrogen defects by alkali of ionic liquid and the extended π-electron delocalization in the conjunction carbon nitride networks. As a consequence, the resulted carbon nitride using optimized amount of pyridinium alkaline ionic liquid (AIL-2.0-CN) photocatalyst exhibited a high hydrogen evolution rate of 1284 μmol h −1 g −1 (λ>420 nm) with an apparent quantum efficiency of 4.2 % at 420 nm, which is 13.6 times higher than that of bulk g-C 3 N 4 (B−CN), and even 3.5 folds much higher than the one (SHPY−CN) prepared by the similar process to that for AIL-2.0-CN except for the replacement of pyridinium alkaline ionic liquid by a mixture containing a corresponding amount of pyridine and sodium hydroxide, suggesting the promoting effect resulting from the unique characteristic of pyridinium alkaline ionic liquid. Based on the unique physicochemical properties and the molecules- adjustability, the developed alkaline ionic liquid assisted strategy can open an avenue for designing and preparing excellent g-C 3 N 4 based photocatalysts with tunable geometric and electronic structures for solar hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）