JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
YaoYao Qu,Guojuan Ren,Liying Yu,Baoya Zhu,Fang Chai,Lihua Chen
Herein, the fluorescent carbon dots (CDs) has been synthesized by hydrothermal method by using ethylene diamine tetraacetic acid (EDTA) as a raw materials. The prepared CDs exhibited bright blue fluorscence excited by 340 nm with the quantum yield as high as 52%. The CDs possess special fluorescence responses to 2-nitrophenol (2-NP) and 4-nitrophenol (4-NP), and the slump of fluorescence was demonstrated by CDs solution in the case of 2-nitrophenol and 4-nitrophenol existence. The detection limit of 2-NP and 4-NP was calculated at 77 nM and 60 nM, respectively. Meanwhile, the color response to 2-NP and 4-NP can be observed from achromatic solution to yellow by naked eye. All in all, the obtained CDs can be applied as fluorescence and colorimetric probe in environmental protection.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2012
·
IF 2.905
Xiao Xia Jiao,Hong Qun Luo,Nian Bing Li
A mixture of graphene oxide and tetrachloroauric acid were directly electrochemical co-reduced on a glassy carbon electrode (GCE) through cyclic voltammetry (CV). A graphene–gold nanocomposite film modified GCE was fabricated and used to investigate the electrochemical behavior of 4-nitrophenol by CV, electrochemical impedance spectroscopy, chronocoulometry and linear sweep voltammetry. Compared with the bare GCE and the gold nanoparticles modified GCE, it was found that the oxidation signal of 4-nitrophenol was remarkably improved at the graphene–gold nanocomposite film modified GCE. The experimental parameters such as the types of buffer solutions, the pH of supporting electrolyte, the amounts of deposits, the accumulation time and potential were optimized. Under the optimum experimental conditions, the oxidation peak currents were proportional to the 4-nitrophenol concentration in the range of 3.6 × 10 −8 –9.0 × 1 0 −5 M with a detection limit of 1.0 × 10 −8 M ( S / N = 3). The modified electrode which presented high sensitivity, good repeatability and stability was applied to the direct determination of 4-nitrophenol in river water samples.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
IF 2.289
Decai Huang,Youfu Zhou,Wentao Xu,Zhangfu Yang,Zhuguang Liu,Maochun Hong,Yuanhua Lin,Jianchang Yu
The red phosphor Na 5 Eu(WO 4 ) 4 activated with trivalent M 3+ (M 3+ = Bi 3+ , Sm 3+ ) ions were prepared through the solid state reaction technique. The properties of structure, morphology, photoluminescence were characterized systematically. The lattice parameters were refined by Rietveld method. The emission spectra, excitation spectra, and decay curves were employed to study the luminescent behaviors. Both of Bi 3+ and Sm 3+ doping could increase the red-emitting intensity and corresponding quantum efficiency (QE) of Na 5 Eu(WO 4 ) 4 host. Furthermore, the color rendering index of the commercial yellow phosphor YAG:Ce 3+ was increased from 44.5 to 50.8 and 50.2 by mixed with Na 5 Eu 0.8 Bi 0.2 (WO 4 ) 4 and Na 5 Eu 0.96 Sm 0.04 (WO 4 ) 4 phosphors under 465 nm excitation, respectively. The CIE chromaticity coordinates of these phosphors are close to the standard value for red. Herein, the present materials are promising candidates as red phosphors for white light emitting diodes with near-UV/blue GaN-based chips.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2014
·
IF 3.511
Dan Wu,Zhankui Guo,Yixin Liu,Aiping Guo,Wanruo Lou,Dawei Fan,Qin Wei
A novel and sensitive nonenzymatic sandwich-type electrochemical immunosensor for the detection of gastric cancer biomarker CA72-4 was fabricated using dumbbell-like PtPd-Fe 3 O 4 nanoparticles (NPs) as a novel kind of label. The signal amplification strategy, using the synergetic effect present in PtPd-Fe 3 O 4 to increase the reduction ability of the NPs toward H 2 O 2 , improved the sensitivity of the immunosensor. The immunosensor was constructed by modifying glassy carbon electrode with reduced graphene oxide-tetraethylene pentamine (rGO-TEPA) for effective immobilization of primary anti-CA72-4 antibody (Ab 1 ). Secondary anti-CA72-4 antibody (Ab 2 ) was adsorbed onto the PtPd-Fe 3 O 4 NPs. The proposed immunosensor displayed a wide linear range (0.001–10 U/mL) with the low detection limit (0.0003 U/mL). The immunosensor was evaluated for serum samples, receiving satisfactory results. Therefore, the immunosensor possesses excellent clinical value in cancer screening as well as convenient point-of-care diagnostics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Yonghong Hu,Xiang Liu,Wenge Yang,Jingjing Yin,Yan Liu,Mengmeng Liang
Data on corresponding solid–liquid equilibrium of 4-methylbenzoic acid in (methanol + acetic acid) binary solvent mixtures are essential for industrial design and further theoretical studies. In this study, the solubility of 4-methylbenzoic acid was measured in (methanol + acetic acid) binary solvent mixtures in the temperature ranging from 283.15 to 333.15 K by the analytical stirred-flask method under atmospheric pressure. The results obtained from these measurements were fitted using the modified Apelblat equation, the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) equation and the Jouyban–Acree equation, respectively. All the equations were proven to give good representations of the experimental data. The experiment results indicated that the solubility of 4-methylbenzoic acid in the binary solvent increased with increasing temperature, decreases with increasing methanol content, but the increments with temperature differed from different methanol contents. The Redlich–Kister (CNIBS/R–K) equation was more accurate than the other two equations owning to its lowest value of the overall MD. In addition, the thermodynamic properties of the solution process, including the Gibbs energy , enthalpy, and entropy were calculated by the van't Hoff analysis. The experimental data and model parameters would be useful for optimizing the process of purification of 4-methylbenzoic acid in industry.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Rui Wang,Kai Yan,Fei Wang,Jingdong Zhang
A novel visible-light photoelectrochemical sensor was prepared based on FTO electrode modified with CdS quantum dots (QDs), graphene (GR) and molecularly imprinted polypyrrole (MIP). The electrochemical impedance spectra (EIS) indicated that GR facilitated the electron transfer of CdS modified electrode. Small amount of GR doped in CdS film could dramatically improve the photoelectrochemical response of modified electrode under visible-light illumination. While a MIP layer of 4-aminophenol was deposited on CdS-GR nanocomposites modified electrode, the photocurrent response to 4-aminophenol on the modified electrode was obviously promoted due to the specific binding of MIP with 4-aminophenol. The photoelectrochemical response was linearly proportional to the concentration of 4-aminophenol in the range of 5.0 × 10 −8 mol L −1 to 3.5 × 10 −6 mol L −1 , with a detection limit (3S/N) of 2.3 × 10 −8 mol L −1 . Moreover, the MIP/CdS-GR modified FTO electrode showed excellent selectivity. The proposed visible-light photoelectrochemical sensor based on MIP/CdS-GR/FTO provided a feasible tool for rapid, sensitive and selective determination of 4-aminophenol.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2013
·
IF 3.498
Hong-Jun Chen,Zhao-Hui Zhang,Rong Cai,Xing Chen,Yu-Nan Liu,Wei Rao,Shou-Zhuo Yao
In this work, an imprinted electrochemical sensor based on electrochemical reduced graphene covalently modified carbon electrode was developed for the determination of 4-nonylphenol (NP). An amine-terminated functional graphene oxide was covalently modified onto the electrode surface with diazonium salt reactions to improve the stability and reproducibility of the imprinted sensor. The electrochemical properties of each modified electrodes were investigated with differential pulse voltammetry (DPV). The electrochemical characteristic of the imprinted sensor was also investigated using electrochemical impedance spectroscopy (EIS) in detail. The response currents of the imprinted electrode exhibited a linear relationship toward 4-nonylphenol concentration ranging from 1.0×10 −11 to 1.0×10 −8 g mL −1 with the detection limit of 3.5×10 –12 g mL −1 (S/N=3). The fabricated electrochemical imprinted sensor was successfully applied to the detection of 4-nonylphenol in rain and lake water samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Qianghua Ye,Fanyong Yan,Depeng Kong,Jin Zhang,Xuguang Zhou,Jinxia Xu,Li Chen
Carbon dots (CDs) were covalently linked to 4-carboxyphenylboronic acid molecules to form the 4-carboxyphenylboronic acid molecules-functionalized CDs (CPBA-CDs). The CPBA functional groups, which were reactive toward vicinal diols, could covalently bridge the catechol with the vicinal diol structures and would cause the fluorescence quenching via the static quenching mechanism. As the concentration of catechol increased, the fluorescent signal gradually decreased. The fluorescent response for catechol detection was in the linear ranges from 0.1 to 56 μM with the detection limit of 115 nM. We further demonstrated that CPBA-CDs with good biocompatibility were easily and quickly internalized by human umbilical vein endothelial cells and are particularly suitable for multicolour real-time cellular imaging.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 25
·4744-4748
·
IF 3.849
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Achieving micro-sized and closely packed grains is an essential requirement for high-performance chalcogenide thin film solar cells. Here, I2–II–IV–VI4 (Cu2MnSn(S,Se)4) (CMTSSe) thin films were successfully deposited by carrying out a simple, degradable solution-based process. The structure, composition, and morphology were characterized by powder X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and scanning electron microscopy (SEM), and the Hall effect was also measured. These characterizations indicated that CMTSSe thin films may find applications in photovoltaic absorbing materials. In addition, different substrates were found to affect the morphology and compactness of the grains of the thin film.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DAIRY SCIENCE
·
2017
·
IF 2.474
Kai Luo,Liming Hu,Qi Guo,Chenghui Wu,Songsong Wu,Daofeng Liu,Yonghua Xiong,Weihua Lai
ABSTRACT Immunochromatographic assays (ICA) are widely used to detect pathogens. In this study, we used traditional gold nanoparticles (GNP), quantum dots (QD), fluorescent nanoparticles (FNP), and europium (Eu) (III) chelate nanoparticles (EuNP) as ICA labels. We first compared the ability of the 4 ICA test strips to quantitatively detect Escherichia coli O157:H7 in milk. We then optimized various parameters influencing the ICA. The sensitivity to E. coli O157:H7 of the GNP-ICA, QD-ICA, FNP-ICA, and EuNP-ICA was 2.5 × 10 4 , 5 × 10 3 , 1.0 × 10 3 , and 5.0 × 10 2 cfu mL −1 , respectively. The EuNP-ICA exhibited the highest sensitivity. The amounts of monoclonal antibodies (mAb) per GNP-ICA, QD-ICA, FNP-ICA, and EuNP-ICA test strip were 0.16, 0.37, 0.04, and 0.10 μg, respectively. The corresponding coefficients of variation were 7.4 to 15.8%, 10.4 to 18.6%, 2.7 to 7.8%, and 6.9 to 10.5%, respectively. The FNP-ICA required the least mAb per test strip and had the best coefficient of variation. The linear ranges of GNP-ICA, QD-ICA, FNP-ICA, and EuNP-ICA were 1.0 × 10 4 to 1.0 × 10 6 , 2.5 × 10 3 to 1.0 × 10 6 , 2.5 × 10 2 to 2.5 × 10 5 , and 2.5 × 10 2 to 2.5 × 10 5 cfu mL −1 , respectively. The FNP-ICA and EuNP-ICA had wider linear ranges than GNP-ICA and QD-ICA. Additionally, the FNP-ICA and EuNP-ICA showed better tolerance than GNP-ICA and QD-ICA in the milk samples. The FNP-ICA and EuNP-ICA showed remarkable potential for detection of pathogens in milk.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 3
·595-603
·
IF 4.872
Yan Xiao,Sihuan Lang,Miaomiao Zhou,Jing Qin,Rui Yin,Jingming Gao,Andreas Heise,Meidong Lang
A series of biodegradable and crosslinkable precursors based on poly(4-methyl-ε-caprolactone) (PMCL) were prepared by ring-opening polymerization (ROP), followed by the complete acrylation of both hydroxyl ends. Afterwards, biodegradable networks exhibiting totally amorphous character were obtained via photocrosslinking without organic solvent or high temperature. As a result, their mechanical properties varied significantly from brittle to elastic upon increasing the length of the PMCL precursors. Both covalent crosslinking and trapped entanglements between crosslinking segments were likely to contribute to the unique properties of the bioelastomer. In particular, networks formed by the precursors with large molecular weights presented high flexibility and resilience, which match the mechanical properties of soft tissues like blood vessels, bladder and cardiovascular tissue. Preliminary degradation and in vitro cytotoxicity studies of the crosslinked network showed excellent biodegradability and biocompatibility. Moreover, it was demonstrated that the liquid-like PMCL precursor made the patterning easily processable even in the absence of any solvent or heating.
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2016
·
IF 4.569
Ning Xia,Lin Liu,Yong Chang,Yuanqiang Hao,Xiaojin Wang
This work presented a general way for in situ formation of citrate-capped silver nanoparticle (AgNP) aggregates as labels on an electrode surface. When the electrode surface was functionalised with a member of the o -diphenol family, 4-mercaptophenylboronic acid (MPBA) was anchored onto the electrode surface via a boronate ester covalent bond. The anchored MPBA captured AgNPs through Ag S interaction. The resulting surface-tethered AgNPs could recruit more MPBA molecules and AgNPs through the formation of an Ag S bond and the covalent interaction between the α-hydroxycarboxylate of the citrate and the boronate of the MPBA. This led to in situ formation of a network of AgNPs. The complexes formed between MBPA and citrate acid, as well as dopamine (a member of the o -diphenol family), were characterized by mass spectrometry . The MBPA-induced aggregation of citrate-capped AgNPs in solution was confirmed by UV–Vis spectrophotometry and transmission electron microscopy. The network of AgNPs formed on the diphenol-covered electrode surface was characterized by scanning electron microscopy. The electrochemical signal was measured based on the solid-state Ag/AgCl reaction of the AgNPs. To demonstrate the applications and analytical merits of our design, tyrosinase and protease (thrombin) were measured as model analytes. The proposed strategy is likely to lead to the development of sensors for the detection of other biomolecules.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）