NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 4
·1736-1743
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IF 3.269
Yongling Ding,Hong Yin,Shirley Shen,Kangning Sun,Futian Liu
A chitosan-based drug delivery system, composed of Fe3O4 magnetic nanoparticles (MNPs), CdTe@ZnS quantum dots (QDs) and the anti-cancer drug doxorubicin (DOX), was designed and fabricated. The surfaces of MNPs were modified with carboxymethyl chitosan (CMCS) to minimise the possible fluorescence quenching triggered by magnetic cores. Glutaraldehyde was used as a crosslinking agent to create chemical covalent conjunction between different components, thus enhancing the stability of the obtained nanocomposites. The resulting nanocomposites retain favourable magnetic and fluorescence properties and can be used for bimodal cellular imaging. A sustained pH dependent DOX release with more release at pH = 5.3 was observed. The nanocomposites exhibited low cytotoxicity and CLSM images confirmed the cell fluorescence labelling properties and time-dependent cellular uptake. In summary, the chitosan-based nanocomposites developed in this work provided highly integrated functionalities and are promising for controlled drug delivery and also suitable for in situ cellular imaging.
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高影响因子
TALANTA
·
2017
·
IF 4.162
Sifang Lv,Feng Chen,Chunyan Chen,Xiaoming Chen,Hang Gong,Changqun Cai
We report a rapid and facile resonance light scattering (RLS) technique that utilizes CdTe quantum dots (CdTe QDs) probe to detect microRNA-122. The RLS sensor is ingeniously designed with P1 and P2 , two cDNA sequence probes with partially complementary sequences to miRNA-122. The amine-modified P1 and P2 are coupled to the surface of QDs to form functional QDs-P1 and QDs-P2 conjugates, which are collectively referred to as QDs-P. The cDNAs hybridize with the target miRNA to rapidly induce the self-assembly of QDs probe and change RLS intensity. The proposed technique can detect miRNA-122 within 40 min. RLS intensity is enhanced in proportion with miRNA-122 concentrations of 0.16–4.80 nM and has a low detection limit of 9.4 pM. In addition, the assay satisfactorily detects miRNAs in human serum samples. Thus, the assay has considerable potential for the analysis of other interesting tumor makers.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2016
·
IF 2.693
Hailun Wang,Weiju Zhu,Min Fang,Ying Xu,Cun Li
L-Glutathione (GSH) capped CdTe quantum dots (QDs) (GSH@CdTe QDs) have been successfully synthesized. GSH@CdTe QDs could selectively detect Ag + by fluorescence emission spectrometry in aqueous medium. The fluorescence intensity of GSH@CdTe QDs linearly increased upon increasing concentrations of Ag + . The detecting limit of Ag + was found to be 1.3 nM calculated from the linear concentration range of 0.02-0.2 μM. The other foreign mental ions displayed no significant response revealing good selectivity of the sensors towards Ag + . The experimental results indicated the GSH@CdTe QDs were well applied as fluorescence sensor to detect Ag + in aqueous with high sensitivity and selectivity. Furthermore, it was found that the enhancement of fluorescence intensity arose from the formation of Ag 2 Te which modified the surface traps on GSH@CdTe QDs.
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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.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 34
·13171-13175
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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.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Jian Zhu,Zhu-Jun Zhao,Jian-Jun Li,Jun-Wu Zhao
We present a wavelength shift-based fluorescence detection method for ascorbic acid (AA) using CdTe quantum dots (QDs). Upon addition of ascorbic acid, the fluorescence emission peak of CdTe QDs red shifts linearly with the increase of the AA concentration, and the red shift speed could be improved by increasing the diameter of the QDs. The mechanism has been attributed to the AA-induced size change of the QDs. This AA-dependent red shift of fluorescence emission has been used to detect and quantify AA. Dynamic range and detection limit of this fluorescence probe are found to be 10–250 μmol/L and 1.3 μmol/L, respectively. Interference studies indicate that the AA could be specifically detected by using this wavelength shift-based fluorescence probe, and the QDs with larger diameter have better anti-interference performance. This fluorescence detection method is based on the wavelength shift of the emission peak, which is different from those reported traditional emission intensity-based fluorescent probes . Thus this fluorescence probe has the advantages of higher accuracy and convenient operation, which provides an effective strategy for design of wavelength shift-based fluorescence sensing method.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ji Yang,Zheng-Zhong Lin,Hui-Ping Zhong,Xiao-Mei Chen,Zhi-Yong Huang
A novel fluorescent probe based on CdTe QDs coated with molecularly imprinted polymers (MIP) was prepared for the determination of leucomalachite green (LMG) with the method of synchronous fluorescence quenching. When the wavelength interval of excitation and emission positions (Δl) was set as 340 nm, the strongest synchronous fluorescence emission of MIP-coated QDs was achieved at 260 nm, enabling the maximum fluorescent quenching of LMG because of the inner filter effect. According to this principle, a synchronous fluorescence quenching method for the rapid detection of LMG in fish was developed. MIP-coated QDs were synthesized using acrylamide (AM) and ethylene glycol dimethacrylate (EGDMA) as functional monomers and cross-linker, respectively. MIP-coated QDs with an average diameter around 67 nm were obtained at the optimum conditions (the molar ratio of 1:8:20 of LMG, AM and EGDMA, 60 mL of acetonitrile, 28 h of polymerization time). The synchronous fluorescence of MIP-coated QDs was linearly quenched by LMG at concentrations from 0.1 to 20 μmol L −1 . Detection limit was 30 nmol L −1 (3 σ , n = 9) with spiked recoveries from 94.0% to 107.8% in fish samples. The results indicate that the method can be applied to the accurate and rapid detection of LMG residues in fish samples.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mingyang Liu,Qi Li,Xudong Xiao,Xuena Ma,Xiaoqin Xu,Yihang Yin,Bin Zhang,Minghui Ding,Jinlong Zou,Baojiang Jiang
Interface engineering has been recognized as one of the most promising strategies for tuning the catalytic properties of catalysts. However, building well-defined nanointerfaces for efficient oxygen reduction/evolution reactions (ORR/OER) remains a challenge. Herein, a hollow heterostructure composed of highly-dispersed CoTe 2 inside the mesoporous walls of nitrogen-doped carbon nanoboxes and uniformly-dispersed NiTe 2 outside the mesoporous walls (H-CoTe 2 /NiTe 2 @NCBs) is designed via a ZIF67-involved etching-anchoring-tellurization strategy. Promising half-wave potential of 0.86 V and overpotential of 320 mV at 10 mA cm −2 are obtained by H-CoTe 2 /NiTe 2 @NCBs. The excellent ORR/OER activity of H-CoTe 2 /NiTe 2 @NCBs is ascribed to the synergistic coupling based on nanointerfaces between CoTe 2 and NiTe 2 . Density functional theory calculations confirm that the nanointerface-based electronic coupling between CoTe 2 and NiTe 2 facilitates the charge transfer between two components and generates abundant catalytically active sites at the heterointerface, thereby significantly promoting the ORR/OER activities. This work provides the design principles for transitional bimetallic tellurides as bifunctional electrocatalysts.
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高影响因子
SOLID STATE SCIENCES
·
2025
·
IF 3.3
Zhiwei Jiao,Aolong Sun,Xufang Zhang,Mulan Mu,Haoran Dong
Black phosphorus (BP) has attracted much attention for its excellent electrical and optical properties and its potential in field-effect transistors (FETs). In this work, BP doped with oxygen group elements (sulfur, selenium, and tellurium) was successfully synthesized using the chemical vapor transport method (CVT), and their optoelectronic properties were studied systematically. It is confirmed by X-ray diffraction (XRD) that BP crystals doped with the oxygen group elements exhibited high crystalline quality and yield. Changes in the absorption spectra and surface morphology indicated that doped BP demonstrated significantly enhanced environmental stability compared to undoped BP under prolonged air exposure. Among the doped samples, tellurium (Te)-doped BP showed the highest stability, with a degradation rate of only 9.91 % after 10 days. FETs based on doped BP were successfully fabricated, and their electrical performances were thoroughly evaluated. We found that the hole mobility of BP was dramatically improved by doping, and the selenium (Se)-doped BP possessed the highest hole mobility of 1684.24 cm 2 /V·s.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yaqiang Wang,He Zhang,Yi Wu,Youbo Xing,Xin Guo
CuInTe 2 is the focus of much research interest in I-III-VI 2 diamondoid compounds due to its potentially high thermoelectric performance. However, its unmatched transport behaviors among electrical and thermal properties seriously impede enhanced thermoelectric performance. In this work, we demonstrate that high pressure can dual-optimize the electrical and thermal transport properties, leading to enhanced thermoelectric performance in CuInTe 2 with cationic defects. The results indicate that the carrier concentration level is increased while greatly enhancing carrier mobility owing to the influence of high pressure on the band and electronic structures, realizing an excellent power factor of 1406 μWm −1 K −2 . Furthermore, high-pressure treatments and cationic defects can introduce multiple defect structures with various sizes, strongly scattering full-frequency phonons to reduce lattice thermal conductivity. With these great merits enabled by high pressure, the thermoelectric performance of CuInTe 2 with cationic defects is improved and a maximum zT of 1.12 is obtained at 773 K, fully verifying the advantages of high-pressure treatments in terms of improving transport properties.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Guojun Zhou,Yilin Mao,Jian Zhang,Qiqiong Ren,Maxim S. Molokeev,Zhiguo Xia,Xian-Ming Zhang
Hybrid metal halides (HMHs) with time-resolved luminescence behavior promise to be a breakthrough in multi-level anti-counterfeiting, but controlling the dynamic switching between phosphorescence and fluorescence is extremely challenging. Herein, an array of 0D HMHs is constructed by screening the π -conjugated ligand with room-temperature phosphorescence (RTP). Compared to the organic chromophore, (ETPP) 2 ZrCl 6 possesses a misaligned stacking and rigid structure, contributing to an improved phosphorescence quantum yield (Φ P = 27.50%) and an extended phosphorescence lifetime ( τ = 0.6234 s), as the intervening of inorganic unit [ZrCl 6 ] 2− suppresses the energy losses caused by nonradiative relaxation and prompts the intersystem crossover (ISC) process. Not only that, the interplay of phosphorescence-fluorescence dual-mode emission can be intelligently controlled by doping the active metal Te 4+ , resulting in a dynamic switching between RTP phosphorescence and self-trapped exciton (STE) fluorescence. DFT calculations reveal the governing origins of RTP-STE from the intermolecular ISC channels and spin-orbit coupling (SOC) coefficients. These precise images into periodic pixelated arrays enable the multi-level anti-counterfeiting and information encryption. This work proposes a fluorescence-phosphorescence co-modulating strategy under the premise of dissecting the structural origins for optimizing RTP phosphorescence, which paves the way for designing high-security-level anti-counterfeiting materials.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xin Fan,Xiaoqin Tian,Jianxin Chi,Jiao Zhao,Youjin Zheng,Fangbiao Wang,Lei Zhang,Qi Chen,Hongan Ma
In this paper, the electropositive-electronegative double-filled skutterudite, which is challenging or impossible to synthesize via conventional methods, was successfully prepared using a high-pressure and high-temperature (HPHT) method. The successful filling of Ba-S into the voids of the CoSb 3 crystal structure was confirmed through X-ray diffraction, enthalpy of formation calculations, and EDS spectral analysis. The experimental results indicate that the skutterudite material with porous structure has a lower thermal conductivity of 1.07 W m −1 K −1 at 773 K. The Callaway model fitting analysis revealed that the introduction of Ba, S, and Te enhances both point defect scattering and resonance scattering, thereby effectively reducing the lattice thermal conductivity Consequently, the sample achieves a maximum zT value of 1.44 at 773 K. This work provides novel insights into the study of thermoelectric properties in skutterudite materials.
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高影响因子
危险品化学品经营许可证（带存储）