ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zhen Xu,Yuling Zhang,Bozhen Wang,Zhi Liu,Jinsheng Zhao,Yu Xie
Three novel π-conjugated indolo[3,2-b]carbazole derivatives, 2,8-di(thiophen-2-yl)-5,11-dioctyl-indolo[3,2-b] carbazole (TICZ), 2,8-bis(4-ethylthiophen-2-yl)-5,11-dioctyl-indolo[3,2-b]carbazole (ETICZ) and 2,8-bis(2-(3,4-ethylenedioxythiophene))-5,11-dioctyl-indolo[3,2-b]carbazole (EDTICZ), were synthesized and electrochemically polymerized to afford the corresponding polymers. The effects of different substituent groups on thiophen units in terms of optical, electrochemical, and electrochromic properties and the performance of electrochromic devices (ECDs) were investigated in detail. Electrochemical and optical analysis demonstrated that incorporation of strong auxochromic groups resulted in polymer PEDTICZ with low oxidation potentials, red-shifted absorption peaks and corresponding narrow band gap values but is unfavorable for incorporating ethyl groups . Spectroelectrochemical studies indicated an evident variation in the absorption spectra as well as significant color changes for all of the polymer films upon application of an external potential. PTICZ had high optical contrast with visible light (58.6%), fast switching speed (0.92 s), and satisfactory coloration efficiency (167 cm 2 C −1 ). Of these three systems, the results for PEDTICZ were next best, and those for PETICZ were third. Also, there was a larger contrast (82.7% and 57.8%) in the NIR region (1500 nm) for the PTICZ and PEDTICZ films, respectively. Along with high coloring efficiencies, these results indicate that these systems are favorable for many NIR applications.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Guangsen Tian,Shouzheng Li,Shaojia Song,Hongxi Zhao,Linfeng Zhang,Huadong Wu,Ye Luo,Jianding Li,Jia Guo,Qun Yi
The rational design of D–A type polymeric photocatalysts using triphenylamine (TPA) as the electron donor (D) and a benzothiadiazole derivative (BTDO) as the electron acceptor (A) is investigated. To optimize photocatalytic hydrogen evolution, we systematically enhanced the electron-donating capability by incorporating oligothiophene linkers of different lengths, monothiophene (T), bithiophene (DT), and terthiophene (TT), between the TPA and BTDO units. Comprehensive characterization revealed that the number of thiophene rings significantly affects both the photophysical and electrochemical properties of the polymers, thereby directly affecting photocatalytic activity. The results demonstrate that introducing thiophene oligomers significantly improves performance, with the terthiophene (TT) linker proving exceptionally advantageous. The TPA-TT-BTDO polymer exhibits a substantially broadened visible light absorption range, a reduced bandgap, and most critically, highly efficient suppression of photogenerated charge carrier recombination. This enhancement is attributed to the unique coplanar conformation enforced by the TT unit, which minimizes the dihedral angle between TPA and BTDO, facilitating intramolecular charge transfer. TPA-TT-BTDO achieved an outstanding photocatalytic hydrogen evolution rate of 101.2 mmol h−1 g−1 under visible light (λ ≥ 420 nm) at 10 °C without noble metal co-catalysts. Remarkably, its activity further increased to 125 mmol h−1 g−1 under natural sunlight irradiation. Systematic analysis revealed that longer thiophene chains induce a bathochromic shift, diminish PL intensity, yet improve photoelectrochemical properties and charge transfer efficiency. This work validates the molecular design strategy of precisely controlling oligothiophene chain length to modulate the band structure and electronic properties of D–A polymers. The superior performance of TPA-TT-BTDO stems synergistically from its extended light harvesting, efficient charge separation, and rapid interfacial transfer. These findings may provide crucial insights and practical guidance for developing high-efficiency polymeric photocatalysts through targeted molecular engineering.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2023
·
IF 3.6
Yuhang Xue,Chengjun Wu,Haiwen Li,Cunde Wang
Acetic acid-catalyzed (3 + 2) cyclization reaction of substituted 2-aroyl-3-aryl-1,1-dicyanocyclopropanes with arylhydrazines was investigated for the efficient synthesis of 4-dicyanomethyl-1,3,5-triaryl-4,5-dihydropyrazoles in good yields, in which 4,5-double substituents are predominantly trans selective. This approach included the consecutive condensation, ring opening, and double nucleophilic cyclization reaction.
研究领域:
有机化学
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合成方法学
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杂环化学
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DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 21
·215502
·
IF 3.953
Fang-hui Wu,Guo-qiang Wen,Xiang-rui Luo,Xu-dong Xu,Zi Liu,Wen-bin Sun,Yan-shang Kang,Zhengquan Yan
To improve the sensitivity for electro-chemiluminescent (ECL) detection of chloramphenicol (CAP), a common broad-spectrum antibiotic, boron nitride quantum dots (BNQDs) were prepared with excellent photoelectric property and low toxicity. After its structure and electrochemical property were investigated in detail, it was noted that the ECL signal of Ru(Phen)32+ could be strengthened by the proposed BNQDs, which was further activated by ten's times in the presence of CAP. Under the optimized conditions, there was an excellent linear relationship between ΔECL and lgcCAP in a wide linear range from 1.0 × 10−10 to 1.0 × 10−6 mol l−1 CAP. The detection limit was super-low to be 3.3 × 10−11 mol l−1 (S/N = 3). When applied for CAP detection in real pharmaceutical and food samples, the recoveries were between 97.8% and 105.7% with R.S.D. less than 3.3%. A possible CAP-activated ECL mechanism of BNQDs-Ru(phen)32+ was also proposed. This work will offer a great potential for efficient monitoring of CAP pollution and clinical diagnosing of CAP-related diseases in future.
研究领域:
分析化学
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环境科学
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药学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Fahui Li,Yiyue Shen,Yupei Deng,Jingchun Zhang,Qiqi Wang,Haoyuan Chen,Mai Ouyang,Qianwen Jiang,Guowei Wang,Linghua Zhuang
Ionic liquids (ILs) have emerged as a promising class of green solvents suitable for cellulose dissolution. In this study, two dihydroxyl-functionalized ionic liquids, 1-methyl-3-(2,3-dihydroxypropyl)-imidazolium chloride ([DPmim]Cl) and 1-butyl-3-(2,3-dihydroxypropyl)-imidazolium chloride ([DPbim]Cl), were prepared for microcrystalline cellulose (MCC) dissolution. The physical properties of [DPmim]Cl and [DPbim]Cl, such as relative viscosity, density, electrical conductivity, and Kamlet-Taft parameters (β and π*), were evaluated. The dissolution and regeneration properties of MCC in [DPmim]Cl and [DPbim]Cl were investigated. The regenerated MCC was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Density functional theory (DFT) simulations were used to investigate the interactions between ionic liquid and cellobiose. [DPmim]Cl and [DPbim]Cl, with higher β-values (0.975 and 1.098) respectively, exhibited stronger hydrogen bonding alkalinity. This increased alkalinity enhanced their ability to accept hydrogen bonds from cellulose, which in turn weakened the inter- and intra-molecular hydrogen bonds within cellulose. As a result, the dissolution of MCC was promoted. The dissolution of MCC in [DPmim]Cl was faster than [DPbim]Cl at same temperature. FTIR, TGA, and XRD characterizations showed that the hydrogen bonding network of microcrystalline cellulose was disrupted during ionic liquid dissolution. DFT simulations unveiled the formation of strong hydrogen bonds between the hydroxyl groups of ILs and the hydroxyl or ether linkages in cellulose. These hydrogen bonds have been identified as a potential crucial factor in facilitating the dissolution of cellulose.
研究领域:
化学
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材料科学
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物理化学
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计算化学
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DOI
高影响因子
DYES AND PIGMENTS
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2020
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IF 4.613
Siying Du,Nannan Yao,Shungang Liu,Yongzhuo Xu,Jiamin Cao,Wenliu Zhuang,Junting Yu,Nong Wang,Donghong Yu,Fengling Zhang,Ergang Wang
Comprehensive design ideas on the fused-ring donor-core in state-of-the-art acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) are still of great importance for regulating the electron push-pull effect for the sake of optimal light-harvesting, frontier molecular orbital levels, and finally their photovoltaic properties. Herein, thieno[3,2- b ]thiophenes were fused in bay-area of naphthalene via six-member-ring connection, resulting in the formation of dihydropyrenobisthieno[3,2- b ]thiophene based octacyclic ladder-type donor core, which was flanked by two 1,1-dicyanomethylene-3-indanone (IC) acceptor motifs with and without 5,6-diflourination, namely PTT-IC and PTT-2FIC , respectively, as novel efficient A-D-A fused-ring electron acceptors (FREAs). Compared with PTT-IC , fluorinated PTT-2FIC possesses narrower optical bandgap of 1.48 eV, better π-π stacking, and its PBDB-T: PTT-2FIC blend film exhibited better morphology, and better hole and electron mobility . As a result, nonfullerene solar cells using PBDB-T: PTT-2FIC as the active layer achieved a decent PCE of 10.40%, with an open-circuit voltage ( V OC ) of 0.87 V, a fill factor (FF) of 0.65, and a much higher short-circuit current ( J SC ) of 18.26 mA/cm 2 . Meanwhile, the PBDB-T: PTT-IC cells delivered a lower J SC of 12.58 mA/cm 2 but a higher V OC of 0.99 V, thus resulting in a PCE of 7.39% due to its wider optical bandgap of 1.58 eV and higher LUMO energy level. These results demonstrated that NFAs based on fused-ring donor core from fusing thieno[3,2- b ]thiophenes with naphthalene via six-member-ring connection are promising for organic photovoltaic applications.
研究领域:
材料科学
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有机光电子学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Sai Lian,Zhiyong Huang,Zhengzhong Lin,Xi Chen,Munetaka Oyama,Xiaomei Chen
In this work, a novel and highly selective molecularly imprinted sensor for the detection of melamine in milk using electrochemiluminescence (ECL) is reported. The preparation was carried out by modification of a glassy carbon electrode with a composite of silica nanoparticles doped with [Ru(bpy) 3 ] 2+ (RUDS) and molecularly imprinted polymer (MIP). The keys of the sensor were to employ RUDS as an ECL luminophore to prevent [Ru(bpy) 3 ] 2+ leaching from the modified electrode and MIP as a material for selective recognition. Taking advantage of the MIP pre-concentration effect, melamine could be extracted from the solution and detected by the resulting ECL signal enhancement of [Ru(bpy) 3 ] 2+ . Under optimized conditions, the relative ECL signal was proportional to the logarithm of melamine concentration in the range of 1 × 10 −12 –1 × 10 −7 mol L −1 , with a detection limit as low as 5 × 10 −13 mol L −1 . Compared with the RUDS/non-imprinted polymer, the RUDS/MIP modified electrode displayed high recognition ability, good reproducibility, and stability. To verify its reliability, the fabricated ECL sensor was used for determining the concentration of melamine in milk.
研究领域:
分析化学
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食品安全
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传感器技术
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 6
·2352-2361
·
IF 10.182
Yuanlong Guo,Long Li,Gu Guo,Min Pei,Lihua Zhang,Haibo Xie,Hui Sun,Qiang Zheng
Recently, cellulose esters with particular functionality have obtained considerable attention as they can be used in various fields; therefore, the design and facile synthesis of cellulose esters is still a prime subject of research in this area. In this study, a novel cellulose derivative, namely cellulose-3-(2-hydroxyphenyl) propionate ester (CHP), was first prepared using cellulose and 3,4-dihydrocoumarin (DHC) in dimethylsulfoxide (DMSO)/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/CO2, a newly developed cellulose solvent system, without adding any external catalyst. The effects of the reaction conditions on the substitution degree (DS), including DHC loading, reaction temperature and time, were systematically investigated, and the CHP with a DS of 2.35 could be prepared when the molar ratio of DHC to anhydroglucose units (AGU) was set at 6/1 at 120 °C in 3 h. The structures and thermal properties of the as-prepared CHP were fully elucidated by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The ultraviolet (UV) absorption properties and free radical scavenging ability were evaluated by UV-visible absorption spectroscopy and a well-developed 2,2-diphenyl-1-picrylhydrazyl (DPPH)-based colorimetric protocol. The CHPs were identified to have satisfactory UV absorption properties and antioxidant capacity, and the instant DPPH radical scavenging activity reached 68.1% to 100% in 30 min when 40 mM of CHP was applied at 25 °C. Kinetic studies demonstrated that the reaction followed a pseudo-first order reaction kinetic model, and the activation energy (Ea) and Arrhenius frequency factor (A) of CHP-3 to DPPH could be calculated to be 24.24 kJ mol−1 and 2.5918 s−1 by the Arrhenius equation, respectively. The cytotoxicity of the CHPs was also primary evaluated in L929 cells to identify the potential of CHPs for biomedical applications.
研究领域:
材料科学
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化学
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生物医学工程
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高分子科学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 9
·1-6
·
IF 1.784
Zhao Tian,Dong Ming,Zhao Yi
[Fe(HB(pz) 3 ) 2 ], a well-studied spin-crossover (SCO) complex, has been entrapped in NH 2 -MIL-101(Al) metal–organic framework (MOF) via gas diffusion method. [Fe(HB(pz) 3 ) 2 ] would sublimate when temperature exceeds 100 °C, especially at low pressure. Thus, in the selected condition, [Fe(HB(pz) 3 ) 2 ] molecules can be sublimated to a gas phase and diffused into the pores of NH 2 -MIL-101(Al), which yield [Fe(HB(pz) 3 ) 2 ]@MIL-101 hybrid materials. The identity of composites, with a loading of iron complex at ~ 8 wt%, was characterized by X-ray diffraction and spectroscopic attestation. The hybrid materials demonstrate a gentle spin transition curve from 300 to 400 K, which is different from the SCO behavior of [Fe(HB(pz) 3 ) 2 ]. And for the pure [Fe(HB(pz) 3 ) 2 ] sample at 400 K, only 60% of Fe(II) is in HS, while in hybrid samples, HS state is complete. This interesting phenomenon might indicate that the spin transition in the hybrid sample can be triggered at lower temperature. The composite samples were thoroughly studied by X-ray diffraction, IR spectroscopy, atom absorption spectroscopy, nitrogen physisorption, and magnetic measurements. Thereby, a novel MOF-based material with isolated SCO units is proposed, which demonstrate a salient ‘matrix-effect’ on spin-crossover behavior of [Fe(HB(pz) 3 ) 2 ].
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Amin Zhang,Chongchong Miao,Hongyuan Shi,Hongkun Xiang,Chusen Huang,Nengqin Jia
Recent years have witnessed the great development of electrochemiluminescence (ECL) as a platform for the analytical processes in many fields, which includes pharmaceutical analysis, immunoassay, DNA analysis as well as clinical analysis. Herein, a novel electrochemiluminescence (ECL) sensor was fabricated for ultrasensitive detection of atropine based on Ru(bpy) 3 2+ /carbon nanospheres/Nafion composite film. The carbon nanospheres (CNPs) in composite film were obtained through a hydrothermal method. Then, electrochemical and ECL behaviors of the proposed sensor were investigated. Under the optimal conditions, the constructed atropine sensor showed a wide linear range from 0.5 to 250 μM with a detection limit of 0.17 μM (at signal-to-noise ratio of 3). Moreover, the results indicated that the CNPs-based ECL sensor exhibited excellent sensitivity and favorable stability, which might be ascribed to the high surface area and the good electrical conductivity of CNPs. Furthermore, the ECL sensor was applied for the determination of atropine in atropine sulfate injection samples and displayed a desirable result. The proposed ECL sensor could be easily obtained and be promising used for drug assay.
研究领域:
分析化学
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药学
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电化学
·
纳米技术
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Xiu-hua Wei,Xing Qiao,Jie Fan,Yuan-qiang Hao,Yin-tang Zhang,Yan-li Zhou,Mao-tian Xu
Herein, a label-free electrochemiluminescence (ECL) biosensor for sensitive determination of carcinoembryonic antigen (CEA) was fabricated based on CdS quantum dots loaded onto metal organic framework (CdS QDs@MOF) and triethanolamine modified on gold nanoparticles (TEOA@AuNPs) as bi-coreactants of Ru(bpy) 3 2+ ECL system. The TEOA@AuNPs served as not only coreactant of Ru(bpy) 3 2+ but also nanocarrier for CEA aptamer which was bonded to the TEOA@AuNPs through Au–S bond. After incubated in CEA solution, the ECL signals decreased due to the poor conductivity of CEA and there was a linear correlation between the ECL intensity and log(C CEA ). Based on this result, a label-free ECL biosensor has been developed successfully and used to detect CEA with a detection limit of 8.5 × 10 −5 ng/mL. The proposed ECL aptasensor had good analytical performance in the detection of CEA in human serum samples.
研究领域:
生物传感
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医学检测
·
纳米技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2014
·
IF 3.84
He Zhou,Huan Yue,Yali Zhou,Lin Wang,Zhifeng Fu
Novel amorphous carbon nanoparticles (ACNPs) with high electrochemiluminescence (ECL) quenching efficiency were prepared from candle soot with a quite simple approach. The prepared ACNPs were employed as novel energy quenchers for an ECL immunosensor on a disposable screen-printed carbon electrode array (SPCEA) substrate. Gold nanoparticles-doped chitosan composite film was utilized to immobilize Ru(bpy) 3 2+ -labeled antibody on the SPCEA, and ACNPs were linked with antigens to obtain ACNP-antigen conjugate. The immunoreaction between the Ru(bpy) 3 2+ -labeled antibody and the ACNP-antigen conjugate bridged the Ru(bpy) 3 2+ donor and the ACNPs acceptor, which led to quenching of ECL emission from Ru(bpy) 3 2+ via energy transfer. In the presence of the target antigen, this antigen competed with the ACNP-antigen for the immobilized Ru(bpy) 3 2+ -labeled antibody, thus led to decreased occurrence of the ECL quenching. This ACNPs-based ECL quenching system was successfully applied to detect mouse IgG, which was used as a model analyte. The method showed a linear range of 0.50–400 ng mL −1 and a detection limit of 0.35 ng mL −1 . The results for real sample assay and recovery test demonstrated the reliability of this ECL quenching-based immunosensor. It could be further extended to multiplexed immunoassay of biomarker proteins for clinical diagnosis.
研究领域:
分析化学
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生物传感器
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纳米技术
·
临床诊断
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）