MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qianfeng Li,Jian Sun,Xiang Li,Changling Yan,Gongke Wang
Silver ion (Ag + ) is a significant metal pollutant known for its potential toxicity to aquatic life and human health. Long-term exposure to toxic heavy metals will do great harm to humans and animals. Therefore, it is urgent to develop an efficient method for detecting Ag + . Herein, we have developed a simple, sensitive, highly selective and cost-effective fluorescence “off-on” mode nanosensor based on environmentally friendly and biocompatible materials for sensitive detection of Ag + in aqueous environments. In this sensing strategy, Ag + can specifically interact with the cytosine-cytosine (C-C) mismatch in single-stranded DNA, where Ag + induces the folding of single-stranded DNA to form hairpin structures and stable metal-mediated cytosine-Ag + -cytosine (C-Ag + -C) base pairs via coordinate bonds. Massive changes to the molecular volume and fluorescence signal are brought about by the development of the C-Ag + -C complex. To reach our objective, CdTe quantum dots (CdTe QDs) with low toxicity and strong signal were prepared as fluorophores for detecting Ag + target. Using the inner filter effect (IFE) between hydrophilic CdTe QDs and MoS 2 nanosheets to achieve the fluorescence quenching of the CdTe QDs, and the subsequent fluorescence turn-on process is due to the formation of C-Ag + -C complex, which makes its probe fluorophore far away from the surface of MoS 2 nanosheets, thus realizing fluorescence “off-on” sensing strategy. The proposed nanosensor can distinguish Ag + from other interfering ions with high sensitivity and selectivity. The nanosensor proposed here possesses a quick response time of 8 min and an ultra-low detection limit of 1.1 nM.
研究领域:
环境科学
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生物化学
·
材料科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Wanjun Liang,Zhengqing Liu,Shaopu Liu,Jidong Yang,Youqiu He
A kind of novel Glyp-functionalized-CdTe/CdS Quantum dots (QDs) was successfully synthesized by coating Glyp on the surface of the CdTe/CdS QDs. The fluorescence emission of the modified QDs was enhanced greatly but with a low resonance Rayleigh scattering (RRS). When it interacted with calf thymus DNA (ct-DNA), the fluorescence intensity of the system was obviously quenched and the RRS was enhanced, both in good linear relations. Based on the above, a novel fluorescence biosensor for simple, sensitive and selective detection of ct-DNA was developed. Under the optimized conditions, the linear ranges of the functionalized QDs fluorescence intensity and RRS intensity versus the concentration of ct-DNA were 0.109–70 μg mL −1 and 0.482–90 μg mL −1 , respectively. The corresponding detection limits by fluorescence quenching and by RRS enhancing methods were 0.0327 μg mL −1 and 0.146 μg mL −1 , respectively. The proposed method was applied to detect ct-DNA in synthetic sample with satisfactory results.
研究领域:
生物传感器
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分子生物学
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分析化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
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IF 4.484
Xiaodan Huang,Lihong Jing,Stephen V. Kershaw,Xiaojun Wei,Haoran Ning,Xiaodan Sun,Andrey L. Rogach,Mingyuan Gao
Ostwald ripening is the dominant particle growth mechanism in traditional routes to synthesize aqueous CdTe quantum dots (QDs), which results in a broadening of their size distribution and also their photoluminescence line width, in the case of prolonged reactions. We introduce a method to suppress the Ostwald ripening through the replenishment of precursors before size defocusing occurs in the aqueous synthetic system, which is realized through a programmed dropwise precursor (source) addition (denoted as PDPA) by a syringe pump arrangement that can control the precursor feed volume and rate. As a result, we have obtained a series of highly monodisperse CdTe QDs, with the emission full width at half-maximum in the red region (106 meV) being even narrower than that in the green region (160 meV). We monitored the conductivity of the reaction solution to follow the consumption of precursors, providing feedback as to whether the replenishment volume was matched. Correlations between the emission quantum yield and the fluorescence lifetime for different precursor source addition rates are provided. The influence of the respective sizes of the CdTe particles employed as precursors in PDPA on the growth rate, monodispersity, and emission characteristics of the resulting QDs is explored, and the underlying mechanisms are rationalized.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Ye Ziqing,Xu Kedian,Gao Yunling
A rapid and sensitive ratiometric fluorescence nanosensor for the detection of norfloxacin was obtained, where the yellow-emitting CdTe quantum dots (QDs) were as an internal reference and aluminium ion (Al³⁺) chelated on the QDs surface as the sensing unit. The nanosensor was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. As the concentration of norfloxacin increased, the sensor exhibited a continuous fluorescence color transition from yellow to blue. The CdTe-Al³⁺ QDs sensor demonstrated a low limit of detection of 6.6 nM. The ratiometric fluorescence sensor was also integrated with a smartphone color recognizer for visual and quantitative detection of norfloxacin with a limit of detection of 1.57 µM. This sensing platform exhibits excellent sensitivity, selectivity, and anti-interference performance, and it has great potential for on-site and quantitative analysis.
研究领域:
分析化学
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环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Pan Zhang,Aizhao Pan,Ke Yan,Jiannan Sun
CdTe quantum dots (QDs) reveal the prospect as temperature sensors for high-speed bearing rotating elements owing to their excellent temperature dependence of photoluminescence (PL) spectra. However, the poor PL peak wavelength stability of CdTe QDs limits its practical application. Herein, we fabricated a CdTe@SiO 2 /PVA hybrid film via a sol–gel process based on CdTe QDs. The peak wavelength of PL spectra of the CdTe@SiO 2 /PVA hybrid film increases linearly with the rising temperatures, which is similar to CdTe QDs. Significantly, the linear relationship between the peak wavelength of PL spectra of the CdTe@SiO 2 /PVA hybrid film and temperature in the heating process from room temperature to 85 °C is consistent with that in the colling process from 85 °C to room temperature. In contrast to CdTe QDs, the CdTe@SiO 2 /PVA hybrid film presents superior PL peak wavelength stability. Furthermore, the uniformity of the hybrid film is significantly improved than our previous preparation method of thin films . The excellent film-forming property of the CdTe@SiO 2 /PVA hybrids is effective to engineering application. The feasibility and accuracy of the CdTe@SiO 2 /PVA sensor are verified through the temperature monitoring test of bearing rotating elements.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Analytical Methods
·
2013
·Vol. 5
·期 19
·5309-5316
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IF 1.855
Yizhong Shen,Shaopu Liu,Jian Wang,Dan Li,Xiaodan Wang,Youqiu He
A sensitive and simple method for the determination of chelerythrine (CHE) was developed based on the fluorescence quenching effect of CHE for glutathione (GSH)-capped CdTe/CdS quantum dots (QDs). Under optimum conditions, a good linear relationship was obtained from 0.073 to 24.0 μg mL−1 with a correlation coefficient of 0.9988, and the detection limit (3σ/κ) was 21.9 ng mL−1. The fluorescence quenching mechanism that has been proposed is based on electron transfer supported by ultraviolet-visible (UV-vis) absorption, fluorescence (FL) spectroscopy and electrochemical techniques. The method has been applied to the determination of CHE in synthetic samples and fresh serum samples from healthy humans with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.
研究领域:
分析化学
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生物医学
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2020
·Vol. 20
·期 10
·6334-6343
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IF 1.134
Xie Cong,Zhao Yubin,Song Yuxiang,Liu Yingjie,Wang Yaya,Yang. Ping,Gao Guanggang
On the basis of maintaining the original characteristics of each component, the composite material obtains the properties that the single component does not have through the synergy between the components. It is of great significance to understand the synergy between the components
for the development of the composite. First of all, we prepared different emitting CdTe quantum dots (QDs), and then fabricated CdTe QDs@reduced graphene oxide (rGO) composites by a simple ultrasonic method. It is found that the fluorescence of QDs quenched, the photocurrent significantly
improved, but the growth rate different from each other because of the different QDs. Afterwards, on the basis of naked QDs, hybrid SiO2-coated QDs were fabricated by a two-step method. After that, hybrid SiO2-coated CdTe QDs@rGO composites were prepared by the same method.
It is found that the existence of the hybrid SiO2 shell leads to the decrease of photocurrent of the composites before and after coating, but the specific capacitance significantly improved, and the cycle stability also better than the naked QDs. This research will make grapheme-based
composites have broad application prospects in energy storage equipment.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Le Wu,Zheng-Zhong Lin,Jun Zeng,Hui-Ping Zhong,Xiao-Mei Chen,Zhi-Yong Huang
A magnetic fluorescent probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was prepared using CdTe QDs and Fe 3 O 4 nanoparticles as co -nucleus and molecularly imprinted polymers (MIPs) as specific recognition sites based on a reverse microemulsion method. With the specific enrichment and magnetic separation properties, the probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was used to detect malachite green (MG) in fish samples. The TEM analysis showed that the particles of CdTe QDs/nano-Fe 3 O 4 @MIPs were spherical with average diameter around 53 nm, and a core-shell structure was well-shaped with several Fe 3 O 4 nanoparticles and CdTe QDs embedded in each of the microsphere . Quick separation of the probes from solutions could be realized with a magnet, indicating the excellent magnetic property of CdTe QDs/nano-Fe 3 O 4 @MIPs. The probe exhibited high specific adsorption towards MG and excellent fluorescence emission at λ em 598 nm. The fluorescence of CdTe QDs/nano-Fe 3 O 4 @MIPs could be linearly quenched by MG at the concentrations from 0.025 to 1.5 μmol L −1 . The detection limit was 0.014 μmol L −1 . The average recovery of spiked MG in fish samples was 105.2%. The result demonstrated that the as-prepared CdTe QDs/nano-Fe 3 O 4 @MIPs could be used as a probe to the detection of trace MG in fish samples.
研究领域:
分析化学
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食品安全
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 90
·73424-73433
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IF 3.84
Yingchun Wang,Ningwei Wang,Xiaoni Ni,Qianqian Jiang,Wenming Yang,Weihong Huang,Wanzhen Xu
In this study, molecularly imprinted technology, combined with fluorescence measurement and computer simulation, was used to detect contaminant p-nitrophenol. Seven molecular dynamics simulations of molecular imprinting prepolymerization systems were performed to optimize the imprinting shell. Results indicated that the system with a p-nitrophenol (4-NP): 3-aminopropyltriethoxysilane (APTES): tetraethylorthosilicate (TEOS) mole ratio of 8 : 8 : 12 led to the best stable template–functional monomer clusters and the hybrid SiO2 layer with CdS-like clusters on the surface of CdTe was synthesized by a simple reflux procedure. The prepared imprinted materials (CdTe@SiO2-MIPs) on the surface of silica contained CdTe nanoparticles (CdTe@SiO2) by surface imprinting and Stöber method polymerization were characterized by transmission electron microscopy, fluorescence spectroscopy, Fourier-transform infrared spectroscopy, ultraviolet–visible analysis and X-ray diffraction. A linear relationship between relative fluorescence intensity and the concentration of 4-NP was obtained with a limit of detection of 0.08 μmol L−1 and the imprinting factor (IF) was 2.23 which indicated that special binding sites with binding property to p-nitrophenol were created on the surface of the CdTe@SiO2-MIPs materials. Ultimately, the feasibility of the fluorescent materials was successfully evaluated through the analysis of 4-NP in tap water and lake water. The recoveries were above 97.3%.
研究领域:
材料科学
·
分析化学
·
环境科学
·
计算化学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Yuan Guo,Xiaoqing Zeng,Haiyan Yuan,Yunmei Huang,Yanmei Zhao,Huan Wu,Jidong Yang
In this study, a novel method for chiral recognition of phenylglycinol (PG) enantiomers was proposed. Firstly, water-soluble N -acetyl- l -cysteine (NALC)-capped CdTe quantum dots (QDs) were synthesized and experiment showed that the fluorescence intensity of the reaction system slightly enhancement when added PG enantiomers to NALC-capped CdTe quantum dots (QDs), but the R-PG and S-PG could not be distinguished. Secondly, when there was Ag + presence in the reaction system, the experiment result was extremely interesting, the PG enantiomers cloud make NALC-capped CdTe QDs produce different fluorescence signal, in which the fluorescence of S-PG + Ag + + NALC-CdTe system was significantly enhanced, and the fluorescence of R-PG + Ag + + NALC-CdTe system was markedly decreased. Thirdly, all the enhanced and decreased of the fluorescence intensity were directly proportional to the concentration of R-PG and S-PG in the linearly range 10 − 5 –10 − 7 mol·L − 1 , respectively. So, the new method for simultaneous determination of the PG enantiomers was built too. The experiment result of the method was satisfactory with the detection limit of PG can reached 10 − 7 mol·L − 1 and the related coefficient of S-PG and R-PG are 0.995 and 0.980, respectively. The method was highly sensitive, selective and had wider detection range compared with other methods.
研究领域:
分析化学
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生物化学
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DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 8
·1547-1552
·
IF 3.879
Yang Huang,Zanyong Zhuang,Xiaogang Xue,Jinsheng Zheng,Zhang Lin
So far, the photoluminescence (PL) properties optimization of mercaptopropionic acid (MPA) capped CdTe has yet to be understood from a perspective of growth kinetics. In this work, the growth kinetics, size distribution and PL properties of CdTe quantum dots (QDs) grown in MPA aqueous solutions of two extreme concentrations, i.e. 0 mM and 50 mM, were systematically investigated. The studies revealed that CdTe QDs coarsen in low and high concentrations of MPA followed different growth kinetics, i.e. a mixed OA (Oriented Attachment)–OR (Ostwald Ripening) growth and an OA dominated growth, respectively. Moreover, the OR growth in a low MPA concentration solution was found to be disadvantageous for narrowing the size distribution but favourable for enhancing fluorescence, while the OA growth in a high MPA concentration solution is beneficial for focusing and controlling the particle size. Further activation energy calculations indicate that the extra MPA that forbids the OR growth and retards the OA growth is favourable for slowing the particle growth, thus achieving CdTe QDs with a controlled size and narrow distribution. Furthermore, the kinetics study reveals how the introduction of concentrated surface ligands affects the PL properties (FWHM and intensity) of the material.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 26
·6081-6090
·
IF 3.431
Sheng Zhen,Chen Ligang
Abstract The concentration of L-cysteine (Cys) and glutathione (GSH) is closely related to the critical risk of various diseases. In our study, a new rapid method for the determination of Cys and GSH in water and urine samples has been developed using a fluorescent probe technique, which was based on crystal violet (CV)-functionalized CdTe quantum dots (QDs). The original QDs emitted fluorescence light, which was turned off upon adding CV. This conjugation of CV and QDs could be attributed to electrostatic interaction between COO − of mercaptopropionic acid (MPA) on the surface of QDs and N + of CV in aqueous solution. In addition, Förster resonance energy transfer (FRET) also occurred between CdTe QDs and CV. After adding Cys or GSH to the solution, Cys or GSH exhibited a stronger binding preference toward Cd 2+ than Cd 2+ -MPA, which disturbed the interaction between MPA and QDs. Thus, most MPA was able to be separated from the surface of QDs because of the participation of Cys or GSH. Then, the fluorescence intensity of the CdTe QDs was enhanced. Good linear relationships were obtained in the range of 0.02–40 μg mL −1 and 0.02–50 μg mL −1 , and the detection limits were calculated as 10.5 ng mL −1 and 8.2 ng mL −1 , for Cys and GSH, respectively. In addition, the concentrations of biological thiols in water and urine samples were determined by the standard addition method using Cys as the standard; the quantitative recoveries were in the range of 97.3–105.8%, and relative standard deviations (RSDs) ranged from 2.5 to 3.7%. The method had several unique properties, such as simplicity, lower cost, high sensitivity, and environmental acceptability.
Crystal violet-functionalized CdTe quantum dots for detecting L-cysteine and glutathione with switch-on fluorescent strategy
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）