Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 10
·3959-3970
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IF 8.067
Guoyi Pan,Jingye Yan,Zilun Tang,Jieheng Zhang,Xiaofeng Lin,Dongpeng Yang,Jianyu Wu,Wenjing Lin,Guobin Yi
The composite materials combining quantum dots (QDs) and photonic crystals (PCs) could produce complex and high-dimensional anti-counterfeiting patterns, which solves the problems of simple coding information and a low anti-counterfeiting level of monochromatic materials. Herein, we reported a novel hybrid hydrogel made up of CdTe QDs and SiO2 PCs for optical anti-counterfeiting and information encryption–decryption. The hybrid hydrogel was prepared by adding CdTe QDs and gelatin-methacryloyl (GelMA) precursor filler into a poly(ethyleneglycol) diacrylate (PEGDA)-based inverse opal hydrogel. Firstly, GelMA-based pregel and CdTe QDs were photo-cured to obtain patterned fluorescent labels, whose fluorescence intensities were greater than those of the single CdTe QD solution. Then, the PEGDA-based inverse opal hydrogel and hybrid hydrogel containing CdTe QDs and SiO2 PCs were prepared, both of which had angular dependence of structural colors and good water wettability. The hybrid hydrogel had a double optical anti-counterfeiting function because it also had fluorescence characteristics under UV light. Moreover, through a simple combination of CdTe QDs and PCs, more complex and higher-dimensional optical composite coding effects were achieved, providing a good single platform for exploring the combination effects. In addition, the preparation process was simple and flexible, which only need to provide visually confused structural and fluorescence color, such as our patterned “100”. Then, the hidden signal could be quickly identified by relevant spectral detection. Therefore, this work offers a simple avenue for encoding complex information from a single hybrid hydrogel platform and provides a method for rapid information decoding.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yangyang Gao,Qigeqi Dong,Shi Lan,Qian Cai,Oudjaniyobi Simalou,Shiqi Zhang,Ge Gao,Harnoode Chokto,Alideertu Dong
Quantum dots (QDs) as potent candidates possess advantageous superiority in fluorescence imaging applications, but they are susceptible to the biological circumstances (e.g., bacterial environment), leading to fluorescence quenching or lose of fluorescent properties. In this work, CdTe QDs were embedded into mesoporous silica nanospheres (m-SiO2 NSs) for preventing QD agglomeration, and then CdTe QD-embedded m-SiO2 NSs (m-SiO2/CdTe NSs) were modified with Ag nanoparticles (Ag NPs) to prevent bacteria invasion for enhanced anticounterfeit applications. The m-SiO2 NSs, which serve as intermediate layers to combine CdTe QDs with Ag NPs, help us establish a highly fluorescent and long-term antibacterial system (i.e., m-SiO2/CdTe/Ag NSs). More importantly, CdTe QD-embedded m-SiO2 NSs showed fluorescence quenching when they encounter bacteria, which was avoided by attaching Ag NPs outside. Ag NPs are superior to CdTe QDs for preventing bacteria invasion because of the structure (well-dispersed Ag NPs), size (small diameter), and surface charge (positive zeta potentials) of Ag NPs. The plausible antibacterial mechanisms of m-SiO2/CdTe/Ag NSs toward both Gram-positive and Gram-negative bacteria were established. As for potential applications, m-SiO2/CdTe/Ag NSs were developed as fluorescent anticounterfeiting ink for enhanced imaging applications.
研究领域:
材料科学
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生物学
·
医学
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DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Guobin Mao,Qin Zhang,Yeling Yang,Xinghu Ji,Zhike He
Alkaline phosphatase (ALP) is a universal and important hydrolase that has been proved to be associated with several diseases. Herein, a simple and effective method was proposed for ALP detection based on the inner filter effect of p-nitrophenol (pNP) on the fluorescence of CdTe/CdS quantum dots (QDs). For the preparation of CdTe/CdS QDs, Na 2 TeO 3 was used as the Te source, and dithiol as the S source and surface ligand. The as-prepared CdTe/CdS QDs show good fluorescence properties, such as high quantum yield (∼80%), and good chemical/photo-stability. pNP is a hydrolysate of p-nitrophenol phosphate disodium salt under the catalysis of ALP, which could effectively quench the fluorescence of QDs due to the absorption spectra of pNP overlaps well with the excitation spectra of the CdTe/CdS QDs. Therefore, the prepared CdTe/CdS QDs could be applied for ALP detection. A good linear relationship ranging from 2.2 to 220 U/L was obtained with the limit of detection as low as 0.34 U/L. In addition, this method was successfully applied for the assay of ALP in human serum with the satisfactory results.
研究领域:
生物化学
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医学检测
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纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Yuanyuan Yang,Xiaohui Liu,Shuang Meng,Shun Mao,Wenquan Tao,Zhuo Li
A molecularly imprinted polymers (MIPs)-isolated AuNP-enhanced fluorescence sensor, AuNP@MIPs-CdTe QDs, was developed for highly sensitive and selective detection of oxytetracycline (OTC) in aqueous medium. The developed sensor combined the advantages of strong fluorescence signal of metal-enhanced fluorescence (MEF), high selectivity of MIPs, and stability of CdTe QDs. The MIPs shell with specific recognition served as an isolation layer to adjust the distance between AuNP and CdTe QDs to optimize the MEF system. The sensor demonstrated the detection limit as low as 5.22 nM (2.40 μg/L) for a concentration range of 0.1–3.0 μM OTC and good recovery rates of 96.0–103.0% in real water samples. In addition, high specificity recognition for OTC over its analogs was achieved with an imprinting factor of 6.10. Molecular dynamics (MD) simulation was utilized to simulate the polymerization process of MIPs and revealed H-bond formation as the mainly binding sites of APTES and OTC, and finite-difference time-domain (FDTD) analysis was employed to obtain the distribution of electromagnetic field (EM) for AuNP@MIPs-CdTe QDs. The experimental results combined with theoretical analyses not only provided a novel MIP-isolated MEF sensor with excellent detection performance for OTC but also established a theoretical basis for the development of a new generation of sensors.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
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2014
·Vol. 116
·期 23
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IF 2.185
Li Muye,Li Fang,He Zhicong,Zhang Junpei,Han Junbo,Lu Peixiang
Two-photon excited fluorescence resonance energy transfer (FRET) between CdTe quantum dots with different emission peaks and Rhodamine B in aqueous solution are investigated both experimentally and theoretically. The photoluminescence and lifetime are measured using a time-resolved fluorescence test system. The two-photon excited FRET efficiency is found to increase as the degree of spectral overlap of the emission spectrum of CdTe and the absorption spectrum of Rhodamine B increases, which is due to the increase of Forster radius of the sample. Moreover, FRET efficiency increases when the ratio of acceptor/donor concentration increases. The two-photon excited FRET efficiency was found to reach 40%.
研究领域:
光学
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材料科学
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生物成像
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 11
·1-7
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IF 5.705
Liang Si-Si,Deng Xu,Fan Yao-Yao,Li Jun,Wang Man,Zhang Zhi-Qi
CdTe quantum dots (QDs) were integrated with polyethyleneimine-coated carbon dots (PEI-CDs) to form a dually emitting probe for heparin. The red fluorescence of the CdTe QDs is quenched by the PEI-CDs due to electrostatic interactions. In the presence of heparin, the blue fluorescence of PEI-CDs remains unaffected, while its quenching effect on the fluorescence of CdTe QDs is strongly reduced. A ratiometric fluorometric assay was worked out. The ratio of the fluorescences at 595 and 436 nm serves as the analytical signal. Response is linear in the concentration range of 50–600 ng·mL −1 (0.1–1.2 U·mL −1 ) of heparin. The limit of detection is 20 ng·mL −1 (0.04 U·mL −1 ). This makes the method a valuable tool for heparin monitoring during postoperative and long-term care. This assay is relatively free from the interference by other analogues which commonly co-exist with heparin in samples, and it is more robust than single-wavelength based assays.
In the presence of heparin, the fluorescence of polyethyleneimine-coated carbon dots (PEI-CDs) at 436 nm remains unaffected, while its quenching effect on the fluorescence of CdTe at 595 nm is strongly reduced.
研究领域:
分析化学
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生物医学工程
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药物分析
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DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Dong Liu,Qingfa Gong,Xixi Xu,Shuyun Meng,Yuye Li,Tianyan You
Photoelectrochemical (PEC) aptasensing has been extensively studied for hazardous material (e.g., pesticide residue) detection, with investigation on photoactive materials being their main focus of study. Herein, a cascade Z-scheme [email protected] 2 ( [email protected] 2 ) heterostructure was designed to fabricate a PEC aptasensor for carbendazim (CBZ) detection in tomato. The [email protected] 2 heterostructure was prepared by taking advantage of electrostatic adsorption between components. The cascade Z-scheme electron transfer was verified in [email protected] 2 , resulting in a significantly enlarged photocurrent (e.g., 2.7-fold higher of that at CdTe/MoS 2 ) for the efficient separation of electron-hole pair. The PEC aptasensor was developed based on the principle that the specific binding of aptamer to target on the surface of [email protected] 2 increased the steric hindrance for electron transfer, facilitating a “signal-off” detection mode for CBZ. The fabricated aptasensor offered a linear range of 0.523–5230 nM (0.1–100 ng mL −1 ) with a detection limit of 1.74 × 10 -10 M (0.033 ng mL −1 ) for CBZ detection, and it was successfully applied to tomato sample analysis. This work will stimulate exploration of cascade Z-scheme materials for sensing, and provides a high-performance PEC sensing platform for the detection of various species.
研究领域:
分析化学
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环境科学
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食品科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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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.
研究领域:
环境科学
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
eFood
·
2019
·Vol. 1
·期 2
·165-172
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IF 0
Ruiqing Long,Te Li,Lihui Wu,Shuyun Shi
A facile method for the synthesis of molecularly imprinted polymers (MIPs) onto CdTe quantum dots (CdTe-QDs@MIPs) was successfully developed, and for the first time used as a sensitive fluorescent nanosensor for specific and rapid determination of caffeic acid (CA) in apple juices. Sol–gel polymerization was selected to fabricate hydrophilic MIPs layer using 3-(aminopropyl)triethoxysilane, tetraethyl orthosilicate, and CA as functional monomer, cross-linker and template, respectively. Under optimum experimental conditions, smaller CdTe-QDs@MIPs particles (48 nm) were synthesized with polymerization time at 2 min, which showed fast fluorescence quenching with response time at 3 min and high sensitivity with a limit of detection at 0.73 μg L −1 . The fluorescence intensity of CdTe-QDs@MIPs presented excellent linearity with the concentration of CA in the range from 2 to 100 μg L −1 ( R 2 , 0.9980). The developed method showed good repeatability with batch-to-batch relative standard deviation at 3.31%, and excellent selectivity over structural analogues. The practicability of the as-prepared CdTe-QDs@MIPs was confirmed by the analysis of CA in apple juices with satisfactory recoveries from 93.3% to 108.3%, and precisions <2.1%. Results demonstrated that a rapid, selective, and sensitive fluorescent method was successfully developed to detect CA in food samples.
研究领域:
食品科学
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分析化学
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DOI
CARBON
·
2022
·
IF 11.307
Chenxi Wang,Jia Chen,Li Zhang,Yaqi Yang,Minghui Huang,Chao Chen,Chunyan Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
In this work, two-dimensional Zn carbon nanosheets (CNs) are obtained after heat treatment of in situ synthesized ZIF-8/NaCl nanocomposites , which are ultrasonically mixed with carboxylated multi-walled carbon nanotubes (MWCNTs). Subsequently, the nanocomposites Zn CNs-MWCNTs with large specific surface area and excellent catalytic properties are obtained. Meanwhile, the photoelectric material H–Cu 2 O/CdTe QDs are drop-coated on Zn CNs-MWCNTs/GCE and the modified electrode Zn CNs-MWCNTs/H–Cu 2 O/CdTe QDs/GCE is obtained. Eventually, a novel dopamine photoelectrochemical sensor based on Zn CNs-MWCNTs/H–Cu 2 O/CdTe QDs/GCE is constructed. Among them, the photocurrent intensity of H–Cu 2 O/CdTe QDs is much higher than that of pure H–Cu 2 O and pure CdTe QDs. This is due to the effective combination of CdTe QDs and H–Cu 2 O to form a p-p heterojunction , which can effectively suppress the recombination of electron-hole pairs. Subsequently, the working mechanism of the photoelectrochemical sensor is investigated in depth by the Kubelka-Munk model. At the same time, the photoelectrochemical sensor has reliable selectivity, stability, reproducibility and limit of detection (LOD = 0.3 nM), and also provides a new idea for the detection of dopamine.
研究领域:
生物医学工程
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材料科学
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分析化学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 68
·38987-38994
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IF 2.936
Dongzhi Yang,Na Wang,Haixia Ji,Shian Sun,Jingjing Dong,Yuanyuan Zhong,Chuntong Qian,Huanghuang Xu
Due to excellent optical properties, CdTe quantum dots (QDs) exhibit great potential in cancer imaging. However, CdTe QDs can be quickly cleared out before reaching the desired location because of their ultra-small size. The structure and optical properties of CdTe QDs are also easily affected by the surrounding solution, which leads to their compromised applications in vivo. Here, CdTe QDs were incorporated into hollow mesoporous silica nanoparticles (hMSN) to form CdTe@hMSN nano-platforms. The as-synthesized system maintained the excellent emission properties of CdTe QDs; meanwhile, relatively high drug loading efficiency was also observed for doxorubicin (DOX). With the target for vascular endothelial growth factor (VEGF), the formed CdTe@hMSN(DOX)–VEGF Abs showed feasibility of tumor-oriented drug delivery and CdTe@hMSN conjugate accumulation. The high accumulation and enhanced targeted drug delivery of CdTe@hMSN conjugates in tumor nodules confirmed that CdTe@hMSN conjugates can serve as promising candidates for cancer detection and treatment.
研究领域:
纳米技术
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癌症研究
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药学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 5
·1-13
·
IF 5.3
Li Ruidan,Tian Li,Song Yujia,Guo Yanjia,Ma Guangping,Han Pengfei,Jiang Hanyue,Wang Wenzhuo,Lu Juan
The self-supporting material Zn3Cu2O2 was synthesized through the methods of electrospinning combined with high-temperature calcination. A novel sensitive electrochemiluminescence (ECL) sensor based on Zn3Cu2O2 and CdTe@MWNTs was constructed by the multi-step amplification strategy. First, Zn3Cu2O2 and CdTe served as the ECL groups to construct the sensor, yielding a larger signal of the sensor in the presence of the co-reactant K2S2O8. Multi-walled carbon nanotubes (MWNTs) were introduced as a carrier to increase the signal value of the sensor further. The synergistic action of CdTe@MWNTs and Zn3Cu2O2 made the system obtain the maximum initial signal. With the addition of Allure Red (AR), the ECL signal decreased. The quenching phenomenon was not only due to the large organic molecule AR occupying the active sites of Zn3Cu2O2 and CdTe, but also, more importantly, because the sensor existed as an ECL-RET mechanism between CdTe and AR. The response mechanism and experimental conditions of the system were also investigated. Under optimal conditions, the sensor showed a linear relationship between the ECL signal change and the logarithm of AR concentration in the range 1.0 × 10−14 to 1.0 × 10−6 mol L−1, the linear equation was ∆I = 15,295.54 + 956.42 log CAR, and the correlation coefficient was 0.9928. The lowest detection limit of (S/N = 3) was 1.67 × 10−15 mol L−1. Satisfactory results were obtained for the analysis of beverages.
研究领域:
分析化学
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材料科学
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环境科学
✓ 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）