Polymers
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2018
·Vol. 10
·期 3
·310
·
IF 2.935
Xiang-Yong Liang,Lu Wang,Zhi-Yi Chang,Li-Sheng Ding,Bang-Jing Li,Sheng Zhang
Although various analytical methods have been established based on quantum dots (QDs), most were conducted in solution, which is inadequate for storage/transportation and rapid analysis. Moreover, the potential environmental problems caused by abandoned QDs cannot be ignored. In this paper, a reusable xerogel containing CdTe with strong emission is established by introducing host–guest interactions between QDs and polymer matrix. This xerogel shows high QDs loading capacity without decrease or redshift in fluorescence (the maximum of loading is 50 wt % of the final xerogel), which benefits from the steric hindrance of β-cyclodextrin (βCD) molecules. Host–guest interactions immobilize QDs firmly, resulting in the excellent fluorescence retention of the xerogel. The good detecting performance and reusability mean this xerogel could be employed as a versatile analysis platform (for quantitative and qualitative analyses). In addition, the xerogel can be self-healed by the aid of water.Keywords:quantum dots;host–guest interactions;xerogel
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Wenying Gui,Huan Wang,Yang Liu,Qiang Ma
A dual-emission molecularly imprinted mesoporous microspheres was designed for specific recognition and highly sensitive and selective determination of malachite green (MG). In this ratiometric fluorescent sensor, green fluorescent CdTe quantum dots (QDs)-doped into the core of silica mesoporous microspheres serves as a reference and provides a built-in correction for environmental effects. The other red fluorescent CdTe QDs are embedded around the pores of the silica microspheres as analytical tag. Then, molecular imprinting technique are integrated with the ratiometric sensor to provide high selectivity for MG . When the photoluminescence (PL) of red CdTe QDs is selectively quenched in the presence of MG, a visual color change from orange to green can be observed by naked eyes. The sensing method has a linear response in the range of 27.4 nM–137 μM with a detection limit of 17.0 nM. Moreover, there is an excellent recognition specificity for MG over other water pollutants. The applicability of this method is evaluated through the determination of MG in river water and lake water samples with satisfactory results.
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DYES AND PIGMENTS
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2018
·
IF 3.767
Ji Yang,Hao Wu,Ming-Hui Wu,Jun Zeng,Zheng-Zhong Lin,Xiao-Mei Chen,Zhi-Yong Huang
Malachite green (MG) is an industrial dye, but has been once abused in aquaculture for disease treatment. Because MG and its metabolite, leucomalachite green (LMG), present great harm to human health, it is essential to rapidly and accurately detect MG and LMG residues in aquatic products. However, the simultaneous screening of MG and LMG is still a challenge to date. In this work, a dual-template molecularly imprinted polymer (MIP) coated CdTe QDs was developed and applied as a nano-probe to simultaneously detect MG and LMG in fish samples via normal and synchronous fluorescence quenching. The molar ratios of templates (MG and LMG) to monomer (APTES) and cross-linker (TEOS), and the amount of CdTe QDs in the probe preparation were optimized. A normal fluorescence emission at 600 nm could be linearly quenched by MG, while the synchronous fluorescence emission at the wavelength interval of 340 nm could be quenched by both LMG and MG. The detection limits of MG and LMG were 17 nmol L −1 and 28 nmol L −1 (3 σ , n = 9), respectively. Based on the equations of Stern-Volmer, MG and LMG could be simultaneously detected without any conversion treatment. The recoveries of MG and LMG in fish samples ranged from 92% to 107% and from 91% to 108%, respectively. The results demonstrated that the as-prepared dual-template CdTe@MIP could be used as a fluorescent probe to rapidly and simultaneously detect MG and LMG in fish samples.
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JOURNAL OF LUMINESCENCE
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2018
·
IF 2.732
Jian Zhu,Si-Nan Wang,Jian-Jun Li,Jun-Wu Zhao
In this work, the effect of core size on the fluorescence emission properties of CdTe@CdS core@shell quantum dots was investigated under the condition of different shell thickness and pH values. Both CdTe and CdTe@CdS core@shell QDs were synthesized in aqueous phase by a simple method, whose optical features were characterized by absorption and fluorescence spectra . High resolution transmission electron microscopy (HRTEM) and X-Ray Diffraction (XRD) were utilized to study the structure and composition of the as-prepared QDs. We can conclude that a smaller initial core exhibits a greater potential for optimizing both fluorescence intensity enhancement and red shift. What's more, there is an optimal shell thickness for the strongest fluorescence intensity while a thicker shell contributes to a larger fluorescence red shift. The optimal pH value is 10.5 for the fluorescence intensity enhancement of the core@shell QDs and a higher pH value is an advantage to expedite the growth rate of CdS shell.
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MATERIALS LETTERS
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2018
·
IF 2.687
Ying Lei,Wensheng Gao,Yu Li,Rundong Wan,Wen Chen,Rui Zheng,Leiqiang Ma,Hongwei Zhou
In the present wok, a series of Ti-filled and Te-doped skutterudite compounds Ti x Co 4 Sb 11.5 Te 0.5 (x = 0.2, 0.3, 0.5) were successful fabricated by combination of microwave synthesis and spark plasma sintering technique. The microstructure and thermoelectric properties of Ti x Co 4 Sb 11.5 Te 0.5 bulks have been investigated systematically. The experimental results show that nearly single phase skutterudite were obtained by 5 min microwave synthesis. The Ti 0.3 Co 4 Sb 11.5 Te 0.5 bulk has smallest and uniform grain size of about 2 μm. The influences of Ti concentration on thermoelectric properties were discussed. A highest ZT of 0.60 for Ti 0.3 Co 4 Sb 11.5 Te 0.5 was achieved at 773 K along with a total thermal conductivity of 3.72 W m −1 K −1 , one might obtain higher values at a higher temperature.
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Analytical Methods
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2018
·Vol. 10
·期 19
·2263-2271
·
IF 2.073
Yunmei Huang,Jidong Yang,Haiyan Yuan,Yuan Guo,Xiaoqing Zeng,Jiawei Cheng,Yuhui Zhang
D-Penicillamine (D-PA), as the dominant enantiomer, is usually used in many clinical drugs, but the other enantiomer, L-penicillamine (L-PA) is a toxic enantiomer. Therefore, it is of great significance to analyze and detect L-PA in biomedical or environmental samples. CdTe quantum dots (CdTe QDs) were modified by N-acetyl-L-cysteine (NALC) as novel fluorescent probes and were successfully utilized for the determination of L-penicillamine. The fluorescence of the CdTe QDs decreased significantly in the presence of cupric ions (Cu2+) due to the binding of Cu2+ to NALC on the surface of the CdTe QDs, but the addition of L-PA immediately resulted in efficient fluorescence recovery of the modulated CdTe QDs. The experimental results showed that the pH of the buffer solution and the concentration of Cu2+ affected the fluorescence intensity upon adding L-PA. Under the optimum conditions, the recovered fluorescence intensity was linearly proportional to the increasing L-PA concentration in the range of 2 × 10−7 to 4 × 10−6 mol L−1, with correlation coefficient R2 = 0.9980. So, a new, simple and rapid method for the determination of L-PA has been developed and its potential has been demonstrated in human serum samples and environmental samples with satisfactory results.
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NANO
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2018
·
IF 1.1
Bo Hu,Yang Lu,Keyu Cui,Yongsheng Yan
In this study, a novel imprinted polymer based on 3-aminophenylboronic acid (APBA)-functionalized CdTe quantum dots (QDs) was synthesized and used to sensitively and selectively detect glucose. In the process of synthesis, the boronic acid in the APBA could combine covalently with vicinal diol compounds, directing imprinting process, and the APBA-modified CdTe QDs were used as the solid supports. By this method, the prepared molecular imprinting polymers (MIPs)-APBA/CdTe QDs show high selectivity, high sensitivity and good stability. Under optimal conditions, a linear relationship was obtained covering the linear range of 0–1.5 mmol/L with a correlation coefficient of 0.99833 and a high imprinting factor about 5.71. Furthermore, the prepared MIPs-APBA/CdTe QDs were successfully applied to detect glucose in human serum samples. This work provides a new way to synthesize an excellent stability and efficient imprinted polymer based on CdTe QDs for convenient, fast and highly selective detection of glucose.
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Energy Storage Materials
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2018
·
IF 0
Haomiao Li,Kangli Wang,Hao Zhou,Xiaolin Guo,Shijie Cheng,Kai Jiang
Developing high energy density batteries is of great significance for various energy storage applications . The novel liquid metal batteries (LMBs), with the merits of low-cost and long-lifespan, however deliver relatively low specific energy due to the electromotive force (EMF) limitation of bimetallic electrodes. Metalloid tellurium (Te) is a potentially high voltage electrode candidate for LMB, but challenged by its poor electronic conductivity and high solubility in molten salts. Herein, for the first time, we demonstrate a high voltage LMB with high energy density enabled by metalloid Te alloying with metallic Sn as positive electrode . This Te-Sn alloying strategy dramatically enhances the electronic conductivity of Te based electrodes, and suppresses the solubility of Te in molten salt electrolyte as well. The Li||Te-Sn cells reported herein present the highest discharge voltage of ca.1.6 V and energy density of 495 Wh kg −1 among all the reported LMBs. These preliminary results broaden the selection of positive electrode materials for LMBs and demonstrate a strategy for developing high energy density batteries for energy storage applications.
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NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 4
·2640-2648
·
IF 3.201
Ji Yang,Ming-Hui Wu,Zheng-Zhong Lin,Zhi-Yong Huang
A novel fluorescence nanoprobe using CdTe quantum dots as signal sources coated with a molecularly imprinted polymer was synthesized by a reverse microemulsion method. The nanoprobe was designed for the detection of leucomalachite green (LMG) in fish samples via synchronous fluorescence quenching based on the inner filter effect. LMG, (3-aminopropyl) triethoxysilane and tetraethyl orthosilicate were used as the template, functional monomer and cross-linker respectively in the probe. A synchronous fluorescence emission of the probe at 260 nm was observed when the wavelength interval was set as 340 nm, and the synchronous fluorescence could be linearly quenched with LMG at concentrations ranging from 0.1 to 20 μmol L−1. The as-prepared nanoprobes were nearly spherical with a diameter of about 50 nm. The detection limit was 23 nmol L−1 (3σ, n = 9) and the recoveries ranged from 96.2% to 104.9% for the fish samples. The results illustrated that the nanoprobe could be used for trace LMG measurement in fish samples.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 1
·288-295
·
IF 1.354
Lu Simin,Li Meng,Liu Debao,Yang Yuntao,Yang Ping
A layer-by-layer (LbL) self-assembled method has been developed to create the nano architectonics consisted of quantum dots (QDs) including hydrophobic CdSe/CdZnS and hydrophilic CdTe and Au nanoparticles (NPs) through a functional silica layer as a linker on a slide glass. The glass
layer was created by the hydrolysis of 3-aminopropyltrimethoxysilane (APS), in which the amino group in APS plays an important role for the connection among QDs and Au NPs. UV-vis and PL spectroscopy, scanning electron microscopy, and transmission electron microscopy were employed to characterize.
The result reveals that Au NPs or QDs could be dispersed in the glass slides at a high concentration, and little aggregation. The PL intensity and absorbance is linearly increased with the number of dipping cycles. Furthermore, when the glass layer between Au NPs and CdTe QDs is thin, the
PL of the QDs quenched because of the Plasmon-enhanced fluorescence resonance energy transfer. In contrast, the bright PL of the QDs was observed when the glass layer became thick. The LbL self-assembled glass film shows excellent stability and transparency, which can make a promise for application
in biochemical, optoelectronic, and clinical diagnosis areas.
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MATERIALS RESEARCH BULLETIN
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2018
·
IF 2.873
Kaimin Huang,Guowu Tang,Qianhang Luo,Guoquan Qian,Li Yang,Fangqiang Yuan,Zhenguo Shi,Qi Qian,Zhongmin Yang
Se 0.5 Te 0.5 semiconductor core optical fibers with phosphate glass cladding were fabricated by using a reactive molten core approach. The core was found to be amorphous with some oxygen diffusing in from the cladding glass. Crystalline Se 0.5 Te 0.5 (c-Se 0.5 Te 0.5 ) semiconductor core fibers were obtained by a post-drawing annealing process. Significant disparities in conductivity under stress and without stress were observed in c-Se 0.5 Te 0.5 semiconductor core fibers. To the best of our knowledge, this is the first time that stress sensing can be realized in c-Se 0.5 Te 0.5 semiconductor core optical fibers. This is in contrast to all previous work on stress sensing using fibers, which require the use of optical probing signals. In addition, it is found that more than 60 times change in conductivity between dark and illuminated states in c-Se 0.5 Te 0.5 semiconductor core fibers. These results demonstrate that c-Se 0.5 Te 0.5 semiconductor core optical fibers have promising applications in stress sensor, photodetector, and optical switch.
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FOOD RESEARCH INTERNATIONAL
·
2018
·
IF 3.52
Zhouli Wang,Xueke Li,Yuejuan Zhao,Yahong Yuan,Rui Cai,Tianli Yue
An approach based on multifunctional fluorescent magnetic nanoparticles was proposed for the enrichment and identification of Alicyclobacillus spp. in apple juice simultaneously. The prepared Fe 3 O 4 magnetic particles (MNPs) were modified by the sol-gel process and a silica shell was formed to improve the reactivity, and then the obtained MNPs@SiO 2 -SH nanoparticles were conjugated with Thioglycolic acid functionalized CdTe/CdS QDs via thiols chemistry. The characteristic evaluation results indicated that the MNPs-QD nanocomposites exhibited good magnetic properties and optical characterization. The polyclonal anti- Alicyclobacillus IgG antibody was immobilized onto the surface of MNPs-QD materials via esterification reactions. The maximum antibody immobilization capacity was 119.62 μg/mg and the adsorption reaction could be accomplished in 60 min. The adsorption process could be represented by Langmuir model and pseudo-second order kinetics equation, respectively. Based on the high immunocapture efficiency and sensitive fluorescence characteristics, the obtained MNPs-QDs-antibody conjugates could be applied to recognize the contamination of Alicyclobacillus spp. and a quantitative analysis method was established for target cells detection. The minimum quantitative limit was 10 4 CFU (colony forming unit)/mL and the testing process could be completed in 90 min. The results indicated that the MNPs-QDs-antibody conjugates can be successfully applied for immunocapture and detection of Alicyclobacillus spp. in apple juice. That is to say, the developed MNPs-QDs-antibody conjugates have exhibit more attractive and great potential for the immunocapture and recognition of target bacteria, fully demonstrated a new method for enrichment and rapid detection of Alicyclobacillus spp. in fruit juices.
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