SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Hucheng Zhang,Yingying Shang,Ting Zhang,Kelei Zhuo,Jianji Wang
CdTe quantum dots (QDs) capped by 1-ethyl-3-methylimidazolium mercaptopropionate ([emim]MP) and the reduced graphene oxide (RG) modified by the amine-terminated ionic liquid ([amim]Br) were synthesized in this work. The coordinating interface interactions between QD and RG render the nanocomposite the excellent electrochemical performances as revealed by cyclic voltammetry, chronocoulometry, and electrical impedance spectroscopy. Based on the experimental results obtained from amimRG, CdTe@MP-amimRG, CdTe@[bmim]MP-amimRG, and CdTe@[emim]MP-amimRG nanocomposites, it is proposed that the synergistic effects between imidazolium rings and graphene are responsible for the enhanced performances. Taking the CdTe@[emim]MP-amimRG nanocomposite as the electrochemical sensor of puerarin, the proposed method demonstrates the linear range over 0.01–4.0 μmol L −1 with the detection limits of 6 nmol L −1 in the aqueous solution (S/N = 3). Moreover, the sensor exhibits fast response time (2s), high sensitivity (74.57 μA μmol L −1 cm −2 ), as well as reproducibility (RSD ≤ 8%), and can maintain the stability at 4 °C for two weeks.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Le Wu,Zheng-zhong Lin,Hui-ping Zhong,Xiao-mei Chen,Zhi-yong Huang
A fluorescent probe based on CdTe quantum dots (QDs) coated with molecularly imprinted polymers (MIPs) was fabricated for the determination of malachite green (MG) by the strategy of fluorescence resonance energy transfer (FRET). The MIP-coated QDs were synthesized through precipitation polymerization using acrylamide and ethylene glycol dimethacrylate as monomer and cross-linker, respectively. The optimum molar ratio of MG, monomer and cross-linker was 1:8:40 in 60 mL of acetonitrile, and the polymerization time was 28 h. The MIP-coated QDs, with an average diameter around 290 nm, showed excellent fluorescence emission in 500–700 nm at λ ex 370 nm. The probe exhibited fluorescence quenching response to MG selectively within only 5 min at the concentrations from 0.1 to 20 μmol L −1 . The fluorescent probe was successfully used to detect MG in water and fish samples with a detection limit of 0.059 μmol L −1 (3 σ , n = 9). The spiked recoveries, from 94.8% to 98.1% for water samples, and 98.1% to 106.2% for fish samples, respectively, indicated that the as-prepared MIP-coated QDs could be used as a fluorescent probe to detect MG rapidly in water and fish samples.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 34
·13171-13175
·
IF 8.262
Zhiwei Zhou,Junyou Yang,Qinghui Jiang,Yubo Luo,Dan Zhang,Yangyang Ren,Xu He,Jiwu Xin
We studied the effect of doping with Bi on the thermoelectric properties of SnTe-based materials. Doping with Bi reduced the density of holes and increased the Seebeck coefficient over a wide temperature range as a result of modulation of the carrier concentration and an increase in the density of states effective mass. The lattice thermal conductivity was also greatly reduced as a result of the wide frequency range of phonon scattering by multiscale architectures derived from Bi doping. A maximum ZT value of c. 1.1 at 873 K was obtained in Sn0.94Bi0.06Te, an enhancement of 165% compared with the undoped sample.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 76
·72715-72721
·
IF 3.289
Yeqing Xu,Xiao Wei,Hongji Li,Xudong Zheng,Kai Lu,Xiqing Liu,Kun Wang,Yongsheng Yan
In this work, 3-aminophenylboronic acid (APBA) modified CdTe quantum dots (QDs) and carbon quantum dots (CQDs) were combined and used as a ratiometric fluorescence probe for the on-site naked eye detection of dopamine (DA). The probe combined the ratiometric fluorescence technique with boric acid functional materials together, and had the features of sensitivity and selectivity. Two kinds of QDs with different emission wavelengths were mixed into one system. To simplify the experimental operation processes, the blue-emission CQDs were introduced to serve as the reference signal, while the red-emission CdTe QDs acted as the response signal. With the addition of DA, the cis-diol compounds of DA covalently linked with APBA on the surface of the CdTe QDs, then the red-emission of the CdTe QDs decreased gradually and the blue-emission of the CQDs kept constant due to the surface quenching state induced mechanism, resulting in the color change of the mixture (from deep pink to blue). Under optimum measurement conditions, the proposed ratiometric probe had the advantage of sensitive detection of DA in a concentration range of 10–220 μM with a detection limit of 0.36 μM. The developed ratiometric fluorescence probe was proved to detect other cis-diol substances, like gallate and catechol. In addition, the developed probe was also applied for the detection of DA in human serum samples successfully. The present study provides a new and facile approach for the detection of DA and other similar substances without the requirement of complex equipment.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 31
·25656-25661
·
IF 3.289
Zhixiang Jiang,Katarzyna Matras-Postolek,Ping Yang
Several kinds of hydrophobic quantum dots (QDs) including CdSe, CdTe, CdSe/CdxZn1−xS, and CdTe/CdSe/ZnSe were fabricated via organic synthesis to observe morphology variation during shell coating. CdSe QDs prepared at a relatively high temperature revealed a hexagonal structure and rod morphology. On being coated with a CdxZn1−xS shell, tetrahedron and rod morphologies were observed. It was found that the reaction temperature and injection rate play important roles. The photoluminescence properties of the core/shell QDs depended strongly on their preparation conditions such as temperature and ligands. For CdSe cores created at a relatively low temperature, CdxZn1−xS shell coating resulted in the formation of cubic CdSe/CdxZn1−xS core/shell QDs. This is ascribed to the role of a CdS interlayer. In contrast, multishell CdTe/CdSe/ZnSe QDs revealed a spherical morphology. Furthermore, the self-assembly of QDs with hexagonal structures occurs while regular assembled structures were not observed for QDs with a cubic morphology according to their transmission electron microscopy images. This is ascribed to a dipole force between QDs. This phenomenon is just related to the morphology and crystal structures rather than their composition.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Tongfan Hao,Xiao Wei,Yijing Nie,Yeqing Xu,Kai Lu,Yongsheng Yan,Zhiping Zhou
In this work, 3-aminophenylboronic acid (APBA) functionalized dual-emission quantum dots (QDs) were prepared and utilized as the ratiometric fluorescence probe for the onsite naked eye determination of glucose. The unique ratiometric fluorescence probe, which combined ratiometric fluorescence technique with boric acid functional materials into one system, has been prepared by hybridizing red-emitting CdTe QDs (r-QDs) and green-emitting CdTe QDs (g-QDs). The fluorescence of the embedded r-QDs stays constant, whereas the g-QDs functionalized with APBA can selectively bind glucose by the chemistry of boronic acid and cis diol compounds, leading to the fluorescence of g-QDs quenched due to the surface quenching states induced mechanism and resulting in continuous fluorescence color changes (from green to red) of the ratiometric fluorescence probe system. Under optimum conditions, the proposed ratiometric probe was used for selective detection of glucose in a concentration range of 0.1–2.0 mmol/L with a detection limit of 4.5 μmol/L. Moreover, the developed ratiometric fluorescence probe was successfully applied to the detection of glucose in human serum samples. The present study provides an efficient and facile ratiometric fluorescence probe for rapid, convenient, sensitive and selective visual identification of glucose in blood glucose sensing without the need of complex equipment.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Fuqiang Fan,Lu Wang,Feng Li,Yu Fu,Huaping Xu
Tellurium-containing photoresponsive polyelectrolyte multilayer films were fabricated by layer-by-layer assembly of a tellurium-containing polymer, photosensitizer, and poly(styrenesulfonate). The resulting films were investigated by UV/vis spectroscopy, XPS, EPR, and fluorescence spectroscopy. Under visible light, the photosensitizer in the film is excited and transforms triplet oxygen into singlet oxygen in aqueous solution. Singlet oxygen oxidizes −Te– to high valence state (Te═O) on the polymer backbone. The generated (Te═O) group makes the micelles more hydrophilic and looser, thereby facilitating the controlled release of the loaded cargo of micelles. These results show that the film has the potential to be used for cargo loading and controlled release, thus may provide a new way to combine photodynamic therapy and chemotherapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Biophotonics
·
2016
·Vol. 10
·期 5
·657-663
·
IF 3.818
Jingjing Yao,Guangxu Xing,Junling Han,Yaning Sun,Fangyu Wang,Ruiguang Deng,Xiaofei Hu,Gaiping Zhang
Novel direct and indirect competitive fluorescence-linked immunosorbent assays ( c FLISA and ic FLISA) for detection of ochratoxin A (OTA) were described using CdTe quantum dots (QDs) as fluorescent label. CdTe QDs were successfully synthesized, which had an emission wavelength of 615 nm. The high purity monoclonal antibody against OTA was prepared through cell thawing and the octylic acid-ammonium sulfate method. The OTA MAbs were successfully coupled with CdTe QDs, and which also retained the original biological activity. The 50% inhibition values (IC 50 ) of the c FLISA and ic FLISA were 0.630 ng/mL, 0.234 ng/mL, the limits of detection (LOD) were 7.06 × 10 –3 and 4.15 × 10 –3 ng/mL, and detection ranges were 7.06 × 10 –3 − 18.34 ng/mL and 4.15 × 10 –3 − 4.88 ng/mL, in-order. The recoveries were 96.0–104.7% along with coefficients of variation (CVs) below 10%. The FLISA provided novel method for determination of OTA and the potential of MAb–CdTe QDs for the establishment of fluorescent immunochromatographic test strip.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2016
·Vol. 16
·期 1
·135
·
IF 2.033
Jiexia Chen,Yifan Liu,Guang-Chao Zhao
A novel photoelectrochemical biosensor for step-by-step assay of tyrosinase and thrombin was fabricated based on the specific interactions between the designed peptide and the target enzymes. A peptide chain with a special sequence which contains a positively charged lysine-labeled terminal, tyrosine at the other end and a cleavage site recognized by thrombin between them was designed. The designed peptide can be fixed on surface of the CdTe quantum dots (QDs)-modified indium-tin oxide (ITO) electrode through electrostatic attraction to construct the photoelectrochemical biosensor. The tyrosinase target can catalyze the oxidization of tyrosine by oxygen into ortho-benzoquinone residues, which results in a decrease in the sensor photocurrent. Subsequently, the cleavage site could be recognized and cut off by another thrombin target, restoring the sensor photocurrent. The decrease or increase of photocurrent in the sensor enables us to assay tyrosinase and thrombin. Thus, the detection of tyrosinase and thrombin can be achieved in the linear range from 2.6 to 32 μg/mL and from 4.5 to 100 μg/mL with detection limits of 1.5 μg/mL and 1.9 μg/mL, respectively. Most importantly, this strategy shall allow us to detect different classes of enzymes simultaneously by designing various enzyme-specific peptide substrates.Keywords:tyrosinase;thrombin;peptide;photoelectrochemical biosensor
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shuguang Yan,Dongyan Deng,Li Li,Yice Chen,Hongjie Song,Yi Lv
Glutathione (GSH) capped Ag 2 Te nanoparticles (NPs) were prepared in aqueous solution, and then investigated by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectra, resonance Rayleigh scattering (RRS) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the prepared GSH-Ag 2 Te NPs have good monodispersity, stability and 3–5 nm. Cytochrome C was chosen as a model analyte to study the potential of GSH-Ag 2 Te NPs in the RRS analytical application. Under optimal conditions, the RRS intensity of GSH-Ag 2 Te NPs was significantly enhanced by interacting with cytochrome C and good linear relationship between the RRS intensity at 365 nm and cytochrome C concentration in the range of 0.08 μg/mL −22.5 μg/mL was found. The limit of detection (LOD) was 0.024 μg/mL. The application in human serum samples indicated that the GSH-Ag 2 Te NPs could be a promising candidate probe of RRS biosensors in the future due to their fantastic features.
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 31
·4520-4527
·
IF 5.375
Lu Wang,Wencong Wang,Wei Cao,Huaping Xu
Nanomaterials with hierarchical responsiveness are of great significance not only for fundamental science but also for future biomedical applications due to sophisticated and hierarchical physiological environments. Herein, we report a selenium- and tellurium-containing block copolymer that can be stepwise oxidized by both chemical methods and electrochemical methods. Differences in sensitivity to the oxidation of selenium and tellurium were employed. By tuning the concentration of the oxidant and oxidation periods, self-assembly behaviors of the copolymer were tuned by stepwise chemical oxidation. After oxidation, some interesting morphological evolution was observed that the polymer micelles crosslinked with each other without any swelling. In the case of electrochemical oxidation, the voltage during the electrochemical oxidation and the oxidation period also affected the level of oxidation. Furthermore, we showed that the degree of electrochemical oxidation varied with a different PEG block length. Considering sophisticated physiological conditions in vivo, this hierarchically responsive system may provide new possibilities as smart delivery vehicles in biological environments.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2016
·
IF 2.693
Yanping Miao,Ping Yang,Katarzyna Matras-Postolek
Large flexible silica films encapsulating hydrophilic CdTe quantum dots (QDs) were fabricated via controlling the hydrolysis of 3-aminopropyltrimethoxysilane (APS). Hydrophilic CdTe quantum dots with green to red emitting were encapsulated in the films through a sol–gel incorporation process for retaining high photoluminescence (PL) efficiency and stability. Fluorescence microscopy and a scanning electron microscopy were employed to examine dispersion of CdTe QDs in the emitting films, which illustrated that structure of silica films was uniform. The PL stability of these flexible silica films was investigated in argon condition, the PL properties of the films encapsulated green-, yellow-, and red-emitting CdTe QDs were very stable. Furthermore, the silica-CdTe QDs emitting films revealed high PL stability under ultraviolet (UV) light irradiation , proper concentration of QDs in silica films can make the films more stable. In addition, different emission flexible silica-CdTe QDs films with large area were obtained. The dual-emitting silica-CdTe QDs films exhibited coordinates (0.384, 0.350) in the Commission Internationale de I׳Eclairage (CIE) chromaticity diagram under blue light as excitation source. Due to flexibility, adjustable colors, high stability, large area, easy to operate, silica-CdTe QDs emitting films show potential application in lighting devices and flat panel displays .
✓ 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）