JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Jiakang Han,Zihao Qiu,Gerile Naren,Rui Meng,Zikang Hu
In recent years, rare earth complexes containing amino acids have attracted much attention in numerous fields, such as light, electricity, catalysis, biological activity, drugs, etc. The rare earth element terbium is considered an important fluorescent metal due to its special electronic structure. It has excellent photophysical properties, such as high color purity, large Stokes shift, long excited state lifetime, and profuse energy levels. It has been used in the fields of fluorescent probes, medical radiation, and chemical sensors. Considering their wide applications, a series of acyl amino acid terbium complexes were synthesized using N-acyl amino acids as ligands, and their structures and photophysical properties were studied. The analysis of the theoretical and experimental results demonstrates that the energy transfer efficiency from ligands to the terbium ion emission levels increases with increasing alkyl carbon chain length, leading to differences in the luminescent intensity of the complexes. The energy transfer efficiency from ligands to rare earth ions was the result of a combination of the relative positions between the resonance energy levels of the central rare earth ion and the lowest triplet state energies of ligands as well as the intersystem crossing probability of the ligands. Moreover, the density functional theory (DFT) was used to determine the geometric structures and obtain 1 H NMR and FT-IR spectra of the terbium complexes. Their structures were further examined by comparing the calculated with the experimental spectra. The results show that the ligands coordinate to the central Tb 3+ through the bidentate chelation mode and that the theoretically determined structure was reliable.
研究领域:
化学
·
材料科学
·
光物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 9
·6666-6674
·
IF 3.708
Linlin Duan,Wei Huang,Yatao Zhang
N-Halamine grafted halloysite nanotubes (N-halamine@HNTs) were used as an antibacterial agents to fabricate polyethersulfone (PES) ultrafiltration (UF) hybrid membranes. N-Halamine@HNTs were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS). The chemical compositions, storage modulus, tan δ, morphology and performance of the membranes were characterized by attenuated total reflection-Fourier transform infrared spectra (ATR-FTIR), dynamic mechanical analysis (DMA), water contact angle, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), overall porosity and pore size measurements. The results showed that the hydrophilicity of the membranes was improved greatly after adding N-halamine@HNTs. Water flux of the hybrid membrane could reach as high as 248.3 L m−2 h−1 when the content of N-halamine@HNTs was 1.0 wt%. In addition, the antibacterial test indicated that the hybrid membranes showed good antibacterial activity against E. coli.
研究领域:
材料科学
·
环境工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Chenyang Shi,Bo Hong,Xueya Zhang,Qian Xiang,Zhian Zhang,Kai Zhang,Jing Fang,Yanqing Lai
Lithium-sulfur batteries are considered to be the most promising high-energy-density storage system, yet the dissolution of polysulfides during the charging process limits the utilization, and cycle stability of active materials, which affects the practical application of lithium-sulfur batteries. Herein, a poly( N -methylaniline) (PMAn) coating film is formed in situ on the cathode surface by electrochemically polymerizing the monomer of N -methylaniline(MAn) contained in the electrolyte during film formation process. The PMAn coating film on the surface of the cathode can prevent the dissolution of polysulfide, then reduce the loss of active material, and slow the oxidation of polysulfide by lithium nitrate , resulting in improved cycle stability. As a result, the lithium-sulfur battery with 0.5 wt% MAn render an initial discharge specific capacity of 1224 mAh/g and a capacity retention of 63.79% for 200 cycles, which is better than the performance of the battery without MAn.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 5
·1098-1102
·
IF 0.399
Zhou Yong,Liu Fude,Wu Haiyan,Duan Lijie,Qu Boyang
One conjugated polymer consisting of carbazole and 3-hexylthiophene moiety, poly (N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole) (PNDC), has been synthesized by ferric chloride oxidative polymerization. The monomer N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole was synthesized and characterized by IR, 1 H-NMR, 13 C-NMR and MS. UV-vis absorption spectrum, fluorescence spectrum, photoluminescence spectrum and electrochemical properties of the polymer were investigated. Polymer PNDC shows maximum peak appearing at 394 nm in UV-vis absorption spectrum, strongest fluorescence-emission at 482 nm in fluorescence spectrum and maximum emission peak at 492 nm in photoluminescence spectrum. The band-gap ( E
g ), HOMO energy ( E
HOMO ), and LUMO energy ( E
LUMO ) of the polymer were obtained as 2.58, -5.32, and -2.74 eV, respectively.
研究领域:
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 5
·053505
·
IF 4.386
Yanfang Song,Jinxiong Wu,Jiliang Zheng,Yiwei Sun,Andrei Ivanets,Guangming Du,Xintai Su
The doping of multiple heteroatoms can improve the electrochemical properties of carbon substrates. However, in existing studies, carbon, iron and nitrogen sources are generally mixed directly and then pyrolyzed for secondary activation. This tends to form aggregates of metal particles or metal oxides and requires the consumption of large amounts of alkali and energy. Therefore, there is an urgent need to develop an environmentally friendly technology capable of uniformly doping iron and nitrogen into carbon materials. In this work, porous Fe–N–C composites were prepared at 600 °C using potassium humate (HA-K) obtained from cotton straw by low-temperature pyrolysis as the carbon source, and urea-iron complexes formed by the pre-coordination of urea and Fe as the iron and nitrogen sources. In the absence of secondary activation, the best sample Fe-NHPC-2 had a good mesoporous structure with high specific surface area (889. 01 m2 g−1). It had a high specific capacitance of 256.8 F g−1 at a current density of 0.5 A g−1. The capacitance retention was 92.6% after 10,000 cycles at a current density of 10 A g−1. In the symmetric supercapacitor application, the energy density reached 33.16 Wh kg−1 when the power density was 600.2 W kg−1.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yan Sang,Xi Cao,Guangdong Dai,Lvxuan Wang,Yin Peng,Baoyou Geng
The construction of heterojunction system can promote the separation and transfer of photogenerated electron-hole pairs, which is conducive to the degradation of sewage. In this paper, heterostructured Bi 2 O 3 /Bi 2 S 3 nanoflowers are fabricated by a one-step hydrothermal method. The microstructure and optical absorption properties are studied through the detailed characterization of this heterojunction. The visible light photocatalytic ability of as-prepared Bi 2 O 3 /Bi 2 S 3 heterojunctions are investigated by photocatalytic removals of RhB and Cr(VI). The results of photocatalysis indicate that removal efficiencies of RhB and Cr(VI) over Bi 2 O 3 /Bi 2 S 3 heterojunction are higher than those of pure Bi 2 O 3 and Bi 2 S 3 . The improved photocatalytic performance of the Bi 2 O 3 /Bi 2 S 3 heterojunctions could be attributed to a combination of the p-n junction between the p-type Bi 2 S 3 and n-type Bi 2 O 3 , and large specific surface areas (46.31 m 2 g −1 ). Moreover, the probable photocatalytic mechanism of composite photocatalysts is explored in detail by active species trapping experiments, N 2 adsorption–desorption, the transient photovoltage electrochemical impedance spectroscopy and photoluminescence measurements. This work provides new insights into building of the efficient and novel heterogeneous photocatalysts and other energy-related devices.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Xiaoxiang Wu,Yali Liu,Mengge Li,Wenxuan Guo,Tianjian Ou,Cong Xiao,Jiadong Yao,Ying Yu,Yuan Zheng,Yewu Wang
Photodetectors based on two-dimensional materials and their van der Waals (vdW) heterojunctions usually have excellent optoelectronic performance and great potential applications. Herein, gallium (Aladdin, particles, 99.999% trace metal basis), selenium (Aladdin, powder, 99.999% trace metal basis), and iodine (Alfa Aesar, 99.999% trace metal basis) are the raw materials for the growth of gallium selenide (GaSe) single crystals by the chemical vapor transport method, in which iodine is the transport agent. Subsequently, GaSe nanoflakes are exfoliated from the grown bulk GaSe crystals by mechanical exfoliation. The n-Si/p-GaSe van der Waals vertical heterojunctions have been designed and fabricated for photodetection, which show good characteristics including a high responsivity of 1.74 A/W and a fast response/recovery time of 48 μs/88 μs under zero bias owing to their type-II band structure and built-in electric field. The results indicate that n-Si/p-GaSe vdW vertical heterojunctions are promising candidates in future ultrafast optoelectronic devices.
研究领域:
光电子学
·
材料科学
·
纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2012
·Vol. 25
·期 4
·389-397
·
IF 0.692
Li Chun-liang,Ye Xiao-dong,Ding Yan-wei,Liu Shi-lin
The coil-to-globule transition of thermally sensitive linear poly( N -isopropylacrylamide) (PNIPAM) labeled with dansyl group is induced by 1.54 μm laser pulses (width≈10 ns). The dansyl group is used to follow the transition kinetics because its fluorescence intensity is very sensitive to its micro-environment. As the molar ratio of NIPAM monomer to dansyl group increases from 110 to 300, the effect of covalently attached dansyl fluorophores on the transition decreases. In agreement with our previous study in which we used 8-anilino-1-naphthalensulfonic acid ammonium salt free in water as a fluorescent probe, the current study reveals that the transition has two distinct stages with two characteristic times, namely, τ fast ≈0.1 ms, which can be attributed to the nucleation and formation of some “pearls" (locally contracting segments) on the chain, and τ slow ≈0.5 ms, which is related to the merging and coarsening of the “pearls". τ fast is independent of the PNIPAM chain length over a wide range ( M w =2.8×10 6 –4.2×10 7 g/mol). On the other hand, τ slow only slightly increases with the chain length.
研究领域:
高分子化学
·
物理化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Wei Li,Shu-ao He,Zi-ying Su,Wei Xu,Xue-chuan Wang
In this paper, the CuO nanoparticles (NPs) with narrow bandgap and near-infrared light response were chosen as the co-catalyst, and a series of BiOCl-CuO (BC-x, x = 1, 2 and 3) heterojunctions with superior visible light response and fast interfacial charge migration were synthesized by a facile one-pot solvothermal method. Then, the morphology, composition, crystal structure, photoelectronic properties and visible-light photocatalytic performance were studied in sequence. Research shows that the incorporation of CuO NPs can effectively enhance the photocatalytic performance of BiOCl semiconductor. For the moderate incorporation of CuO NPs, the p-n heterojunction interfaces can be fabricated between BiOCl and CuO components, so that the light response and interfacial charge migration ability can be effectively improved. Especially, when the content of incorporated CuO NPs was about 0.02 g, the BC-2 heterojunction exhibited the highest photocatalytic activity and very robust photostability in decomposing organic targeted pollutants (acid orange (AO) and bisphenol A (BPA)) and H 2 evolution reaction (HER) experiments under visible-light illumination.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 5
·1857-1865
·
IF 4.478
Sun Liping,Yan Yong,Chen Shuai,Zhou Zijue,Tao Wei,Li Chao,Feng Yi,Wang Feng
Biothiol detection is of great importance for clinical disease diagnosis. Previous nanozyme-based colorimetric sensors for biothiol detection showed unsatisfactory catalytic activity, which led to a high detection limit. Therefore, developing new nanozymes with the high catalytic activity for biothiol detection is extremely necessary. Recently, single-atom nanozymes (SAzymes) have attracted much attention in biosensing due to their 100% atom utilization and excellent catalytic activity. Most previous works focus on the peroxidase-like activity of Fe-based SAzymes by using unstable and destructive H 2 O 2 as the oxidant. It is essential to develop new SAzymes with high oxidase-like activity for biosensing to break through the limitation. Herein, Co–N–C SAzymes with high oxidase-like activity are explored. Furthermore, Co–N–C SAzymes are used as a biosensor for colorimetric detection of biothiols (GSH/Cys) based on the inhibition of thiols toward the oxidase-like activity of Co–N–C SAzymes, which showed high sensitivity with a low detection limit of 0.07 µM for GSH and 0.06 µM for Cys. Besides, the method showed good reproducibility and high selectivity against other amino acids. This work offers new insights using Co–N–C SAzymes in the biosensing field.
研究领域:
生物传感
·
医学诊断
·
纳米材料
✓ 已验证
DOI
高影响因子
ANALYST
·
2020
·Vol. 146
·期 3
·896-903
·
IF 3.978
Xiaolei Xie,Yufei Wang,Xiaobin Zhou,Junyang Chen,Mengke Wang,Xingguang Su
Single-atom nanozymes have drawn wide attention in bio-sensing for their remarkable merits such as low cost, high stability, and maximum atom utilization. Herein, a colorimetric strategy based on Fe–N–C single-atom nanozymes (Fe/NC-SAs) was established for the detection of alkaline phosphatase (ALP) activity. The Fe/NC-SAs prepared by pyrolysis have excellent peroxidase-like activity and can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue color product in the presence of hydrogen peroxide (H2O2). When ascorbic acid (AA) is added to the system, the blue color fades, and the absorbance has a linear relationship with the concentration of AA. Alkaline phosphatase (ALP) can catalyze the hydrolysis of ascorbic acid 2-phosphate (AAP) to produce AA. Thus, a strategy based on Fe/NC-SAs for the detection of ALP activity was established, which provided a linear range of 0.1–1.5 U L−1 and a limit of detection as low as 0.05 U L−1. Besides, Fe/NC-SAs showed high stability under harsh conditions. Moreover, an Fe/NC-SA-based assay was successfully validated using human serum samples for ALP determination with satisfactory results, and has broad prospects in the field of biosensing.
研究领域:
生物传感
·
医学检测
·
纳米材料
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Zahid Nawaz,Nevin Gürbüz,Muhammad Naveed Zafar,Muhammad Nawaz Tahir,İsmail Özdemir,Ryan J. Trovitch
A mild catalytic protocol for aldehyde, amine, and alkyne coupling (A 3 -coupling) allows for the selective synthesis of propargyl amines using 5,6-dimethylbenzimidazole-derived N-heterocyclic carbene (BNHC) silver(I) catalysts. A series of BNHC Ag(Ⅰ) halide complexes were synthesized and their structures have been elucidated through the use of multinuclear NMR and FT-IR spectroscopy. Furthermore, the pseudo-linear geometry of two different compounds was substantiated by single-crystal X-ray diffraction. Silver-based A 3 -coupling was achieved for both acyclic and cyclic secondary amines using a diverse set of alkynes to afford propargyl amines with yields of up to 95 %. The present approach is environmentally benign and water is generated as the sole byproduct.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）