BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Xuwen Gao,Kena Fu,Li Fu,Huaisheng Wang,Bin Zhang,Guizheng Zou
Novel optical labels for biosensing in near-infrared (NIR) region (especially between 800 and 900 nm) are arousing much attention for higher penetrating capability, less scattering and lowered autofluorescent background. Herein, a water-soluble electrochemiluminophore with effective electrochemiluminescence (ECL) around 815 nm is developed via doping dual-stabilizers-capped CdTe nanocrystals (NCs) with Co 2+ species in a growth-doping way. The Co 2+ -doped CdTe NCs not only can preserve the highly-passivated surface states of dual-stabilizers-capped CdTe NCs, but also exhibit efficient red-shifted photoluminescence (PL) and ECL into the promising optical NIR window of 800–900 nm. A spectrum-based ultrasensitive NIR ECL immunosensor is consequently fabricated with the Co 2+ -doped CdTe NCs as tags for the first time, which can selectively and sensitively determine human carcinoembryonic antigen with a wide linearity range from 1 fg/mL to 10 pg/mL and a low limit of detection at 0.2 fg/mL (S/N = 3). This work opens a way to screen novel NIR electrochemiluminophore as well as to modulate the ECL performance of NCs via surface doping and engineering.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 11
·9325
·
IF 5.6
Meng Ji,Liwei Ren,Chunyuan Tian,Xuming Zhuang,Feng Luan
In this paper, glutathione (GSH)-coated Zn-doped CdTe quantum dots (QDs) with different particle sizes were synthesized using the “reflow method”, and the interaction mechanism between the two QDs and lactoferrin (LF) was investigated systemically with different spectroscopic methods. The steady-state fluorescence spectra showed that the LF formed a tight complex with the two QDs through static bursting and that the electrostatic force was the main driving force between the two LF–QDs systems. The complex generation process was found to be spontaneous (ΔG < 0) and accompanied by exothermic and increasing degrees of freedom (ΔH < 0, ΔS > 0) by using the temperature-dependent fluorescence spectroscopy. The critical transfer distance (R0) and donor–acceptor distance (r) of the two LF–QDs systems were obtained based on the fluorescence resonance energy transfer theory. In addition, it was observed that the QDs changed the secondary and tertiary structures of LF, leading to an increase in the hydrophobicity of LF. Further, the nano-effect of orange QDs on LF is much larger than that of green QDs. The above results provide a basis for metal-doped QDs with LF in safe nano-bio applications.Keywords:quantum dots (QDs);lactoferrin (LF);interaction;spectroscopic methods;thermodynamic constants;nano-effects
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Dongyun Liao,Guifang Liang,Yuyao Liu,Wenjun Yan,Yujing Guo,Wenting Liang,Chuan Dong,Lifang Fan
In this work, an efficient and novel photoelectrochemical (PEC) aptasensor for 2,3′,5,5′-tetrachlorobiphenyl (PCB72) was constructed based on [email protected] [email protected] quantum dots ( [email protected] QDs)-decorated TiO 2 nanotubes (TiO 2 NTs). [email protected] QDs were prepared by the combination of CdTe and CdS with a proper lattice mismatch. Due to their large band offsets, [email protected] QDs can reduce undesirable carrier recombination, significantly improving their charge separation efficiency. Then the synthesized [email protected] QDs were modified on TiO 2 NTs ( [email protected] QDs/TiO 2 NTs) through electrostatic adsorption method. The as-prepared composites exhibit a wide visible light absorption range, good PEC activity and high photoelectric conversion efficiency. Also, the PEC aptasensor prepared via the immobilization of anti-PCB72 aptamer on the composites exhibits outstanding analytical performance with high sensitivity and specificity for PCB72 under visible-light irradiation, achieving a detection limit as low as 0.03 ng/L. It was also applied to detect PCB72 in four different real environmental samples with satisfactory results.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Yao Fan,Siying Che,Lei Zhang,Chunsong Zhou,Haiyan Fu,Yuanbin She
The inappropriate application of aminoglycoside antibiotics (AGs) in food products has led to the accumulation of AG residues in the human body. In this study, a novel fluorescent sensor based on mercaptosuccinic acid (MSA)-modified CdTe quantum dots (QDs) were designed for the rapid visual detection of a representative AG, neomycin (NEO). The proposed sensor showed excellent performance toward NEO determination, with a detection limit of 1.60 × 10 −8 mol/L. Furthermore, MSA-CdTe QDs can be applied to the visual detection of NEO, where the fluorescence changes from bright yellow to dark red with increasing NEO concentration. Most importantly, high selectivity of MSA-CdTe QDs toward NEO was achieved even in the presence of other antibiotics, which are common interfering agents, with a recovery rate in actual samples as high as 95.66 %-100.77 % and an RSD of less than 3.15 %.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2022
·
IF 1.193
Kun WANG,Er-Fei DONG,Min FANG,Ting CHEN,Wei-Ju ZHU,Cun LI
A new ratio fluorescence sensor based on mercaptamine capped cadmium telluride quantum dots (Mea-CdTe) and benzocoumarin-3-carboxylic acid (BTA) were constructed. The ratio fluorescence sensor (BTA@Mea-CdTe) was synthesized by amidation reaction between the amino groups on the surface of Mea-CdTe quantum dots and the carboxyl groups of BTA. It is found that Hg 2+ ions react with the amino groups on the surface of the quantum dots in the BTA@Mea-CdTe sensor to quench the fluorescence, but it has no effect on the fluorescence of grafted BTA. The sensor has good selectivity and high sensitivity for Hg 2+ ions detection. The detection linear range is 0.4–1.2 µM, and the detection limit is 0.03 µM. This ratio fluorescence sensor can be used for Hg 2+ visual recognition in water sample detection with obvious color change.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2017
·Vol. 49
·期 2
·222-229
·
IF 2.969
Hongji Li,Zirun Wang,Xiaonan Wang,Jiaqi Jiang,Jiahong Zheng,Yongsheng Yan,Chunxiang Li
In this study, a novel detection method based on the technique of surface enhanced Raman scattering (SERS) was presented. Firstly, the homogeneous Ag particles were prepared and CdTe quantum dots were modified on the surface of Ag particles to synthesize the Ag/CdTe heterostructures as the SERS substrate. Then 2,6-DCP was chosen as the template molecule and combined the technique of atom transfer radical polymerization to prepare Ag/CdTe/molecular imprinted polymers (MIPs). Through characterization analysis, it was proved that the Ag/CdTe/MIPs exhibited splendid SERS properties and selectivity. Under the optimal condition, it was presented good linear relationship (R 2 = 0.96) between the Raman signal (at 1596 cm −1 ) and the concentration of the templates, and the detection limit was determined as 10 −9 mol L −1 . It was envisaged that the sensitivity of SERS coupled with the selective properties of MIPs could induce a promising chemosensor for practical applications.
研究领域:
分析化学
·
环境科学
·
材料科学
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 1
·488-494
·
IF 1.483
Ma Qian,Yang Fanghong,Zhu Yuanna,Wang Junpeng,Che Quande,Shi Ruixia,Yang Ping
Red to near-infrared (NIR)-emitting ternary-alloyed CdTe
x
Se1−x
(x = 0–0.3) quantum dots (QDs) with tetrapod and dot morphologies have been synthesized by a facile method using oleic acid (OA) as single capping agent. The controlled
dot-shaped and tetrapod-shaped CdTe
x
Se1−x
QDs can be successfully obtained by adjusting the content of Te element. It is clear that CdTe
x
Se1−x
QDs display the tunable emission peaks from the visible light
(613.4 nm) to the NIR range (791.6 nm). With an inorganic CdZnS shell coated on the surface of CdTe0.1Se0.9 cores, the stability and PL efficiency of the resulting core/shell QDs can be improved dramatically, accompanied with the red-shift of emission peaks to longer
wavelength (795.6 nm). Peculiarly, a large blue shift of emission spectrum of CdTe0.3Se0.7/CdZnS core/shell QDs is observed, which is mainly ascribed to the shrink of the size of QDs by the fracture of tetrapod arms.
研究领域:
材料科学
·
光学
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JOURNAL OF APPLIED TOXICOLOGY
·
2019
·Vol. 40
·期 3
·388-402
·
IF 3.065
Tianshu Wu,Keyu He,Xue Liang,Tingting Wei,Yan Wang,Lingyue Zou,Ting Zhang,Yuying Xue,Meng Tang
The excellent optical property and relatively low toxicity of CdTe/ZnS core/shell quantum dots (QDs) make them an advanced fluorescent probe in the application of biomedicines, particularly in neuroscience. Thus, it is important to evaluate the biosafety of CdTe/ZnS QDs on the central nervous system (CNS). Our previous studies have suggested that the high possibility of CdTe/ZnS QDs being transported into the brain across the blood-brain barrier resulted in microglial activation and a shift of glycometabolism, but their underlying mechanism remains unclear. In this study, when mice were injected intravenously with CdTe/ZnS QDs through tail veins, the microglial activation, polarized into both M1 phenotype and M2 phenotype, and the neuronal impairment were observed in the hippocampus. Meanwhile, the increased pro- and anti-inflammatory cytokines released from BV2 microglial cells treated with CdTe/ZnS QDs also indicated that QD exposure was capable of inducing microglial activation in vitro. We further demonstrated that the glycolytic shift from oxidative phosphorylation switching into aerobic glycolysis was required in the microglial activation into M1 phenotype induced by CdTe/ZnS QD treatment, which was mediated through the mTOR signaling pathway. The findings, taken together, provide a mechanistic insight regarding the CdTe/ZnS QDs inducing microglial activation and the role of the glycolytic shift in it.
研究领域:
神经科学
·
毒理学
·
细胞代谢
·
生物医学工程
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JOURNAL OF LUMINESCENCE
·
2014
·
IF 2.367
Xiao Wei,Minjia Meng,Zhilong Song,Lin Gao,Hongji Li,Jiangdong Dai,Zhiping Zhou,Chunxiang Li,Jianming Pan,Ping Yu,Yongsheng Yan
In this study, a simple procedure for the determination of λ-cyhalothrin was reported. CdTe quantum dots (QDs) capped by molecularly imprinted polymers (MIPs) were prepared and characterized by spectrofluorometer, Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM) and scanning electron microscope (SEM). Mercaptosuccinic acid (MSA) was chosen as a stabilizer for CdTe QDs synthesis. The MSA stabilizer which comprises both thioglycolic acid (TGA)-like and 3-mercaptopropionic acid (MPA)-like moieties could accelerate the whole growth process of CdTe QDs comparing with TGA-like or MPA-like stabilizer. Meanwhile, the spectrofluorometer was used to evaluate the optical stability, effect of pH, and selective and sensitive determination of λ-cyhalothrin (LC). Moreover, LC could quench the fluorescence of the molecularly imprinted silica nanospheres (CdTe@SiO 2 @MIPs) in a concentration-dependent manner, which was best described by a Stern–Volmer-type equation.
研究领域:
分析化学
·
环境科学
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Xue Wei,Ziqi Han,Xiaobo Min,Zhihong Liu,Qihou Li,Longgong Xia
CdTe thin-film solar cells, as a core component of photovoltaic devices, have been commercially deployed for over 30 years with global installations surpassing 30 GWp. Decommissioning has surged since 2010, showing major material recovery potential from retired modules. However, CdTe thin-film solar cells feature ultra-precise architectures with micron-sized CdTe/CdS/SnO 2 functional layers deposited on glass substrates. This structural complexity and ultralow metal concentrations create significant technical barriers for metal recovery. Current recycling technologies in both literature and practice exhibit insufficient constituent recovery and secondary waste generation, necessitating advanced separation technologies. This study developed an innovative recycling process achieving multi-component recovery: intact glass substrates, high-purity Te powder (99.9 wt%), CdS precipitates (99.0 wt%), and sodium thiostannate (Na 2 SnS 3 ) solutions. There were four steps: (1) Decommissioned modules were heated in air at 300 °C for 1 h to degrade EVA and recover intact back glass; (2) Front glass with functional layers further reacted with NaHS at 400 °C, converting CdTe/CdS/SnO₂ into Te/CdS/SnS₂ powder and recovering clean front glass; (3) Mixed powder was processed at 500 °C for 2 h (<10 Pa), yielding >99.9 wt% Te with 98.31 % ± 2.11 % recovery; (4) Na₂S leaching (140 g/L, L/S = 10:1, 40 °C, 2 h) yielded 99.0 wt% CdS precipitate and Na₂SnS₃ solution with >99 % metal recovery. Material balance analysis and life cycle assessment demonstrated that the proposed technology exhibits superior cost-effectiveness and minimized environmental footprint, while maintaining industrial scalability.
研究领域:
冶金学
·
材料科学
·
环境科学
·
可再生能源
·
化学工程
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Journal of Physical Chemistry C
·
2011
·
IF 4.524
Shungao Yin,Feng Huang,Jing Zhang,Jinsheng Zheng,Zhang Lin
Crystal growth kinetics of thioglycolic acid (TGA)-capped CdTe nanoparticles in H2O was studied at different particle concentrations, with the aim to understand the effects of concentration and surface state of primary particles on the growth mechanism of nanocrystals. The growth process of CdTe nanoparticles was monitored by in situ UV–vis absorbance spectra, which reveal the coexisting growth mechanisms of oriented attachment (OA) and Ostwald ripening (OR). Increasing the primary nanoparticle concentration facilitated the OA-based growth at the initial stage, while the OR growth which was mainly occurring at the latter stage was restrained. On the basis of the fitting activation energy and experimental zeta potential, the effect of surface charge was further discussed and proved to be the critical factor that affected the OA process by directing the particle–particle interaction.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 11
·e70403
·
IF 3.4
Wenming Yang,Xiangpeng Shi,Xiaoqiang Chen,Yuanzheng Cai,Yi Ji,Yunfei Cao,Wanzhen Xu
The presence of sulfonamide antibiotic residues, such as sulfadiazine (SDZ), in aquatic ecosystems presents significant ecological risks, including the emergence of antibiotic resistance. Therefore, the development of precise and sensitive detection methods is of paramount importance. This study focuses on the design of a highly sensitive sensor for detecting SDZ by exploring the effects of quantum dot (QD) emission wavelength, particle size, and surface characteristics on sensor performance. Green, yellow, and red-emitting cadmium telluride (CdTe) QDs were synthesized through systematic adjustments in the molar ratio of Cd 2+ to Te, reflux time, and solution pH. These QDs were subsequently incorporated into silica nanoparticles (NH 2 -SiO 2 ) via molecular imprinting technology to fabricate a multicolor fluorescent imprinted sensor. The results indicated that the sensor incorporating green-emitting QDs (MIPs@g-QDs@SiO 2 ) exhibited the best performance, with a detection limit of 10.53 nM, a fluorescence quenching constant of K Sv , g = 4030 M − 1 $$ {K}_{Sv,g}=4030\ {\mathrm{M}}^{-1} $$ , and a linear detection range of 10–60 μmol·L −1 . In comparison, the yellow and red-emitting QD sensors displayed higher detection limits of 30.58 and 68.52 nM, with quenching constants of K Sv , y = 3700 M − 1 $$ {K}_{Sv,y}=3700\ {\mathrm{M}}^{-1} $$ and K Sv , r = 3360 M − 1 $$ {K}_{Sv,r}=3360\ {\mathrm{M}}^{-1} $$ , respectively. The sensitivity of the green-emitting QD sensor is attributed to its smaller particle size, which results in a larger specific surface area and enhanced surface effects, thereby increasing the fluorescence intensity range. Moreover, fluorescence quenching and selective adsorption experiments demonstrated that MIPs@g-QDs@SiO 2 exhibited excellent selective adsorption properties for SDZ, contributing to its enhanced fluorescent response.
研究领域:
环境监测
·
分析化学
·
纳米材料
·
传感器与生物传感器
·
抗生素检测
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