Nanoscale
·
2019
·Vol. 11
·期 13
·6235-6242
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IF 6.97
Jia Guo,Jinlai Zhao,Dazhou Huang,Yunzheng Wang,Feng Zhang,Yanqi Ge,Yufeng Song,Chenyang Xing,Dianyuan Fan,Han Zhang
Tellurium (Te) exhibits many intriguing properties including thermoelectricity, photoelectricity, piezoelectricity, and photoconductivity, and is widely used in detectors, sensors, transistors, and energy devices. Herein, ultrathin two-dimensional (2D) Te nanosheets were fabricated using a facile and cost-effective liquid-phase exfoliation method. Mixing the as-prepared 2D Te nanosheets with polyvinylpyrrolidone (PVP) provided a uniform 2D Te/PVP membrane. The 2D Te/PVP membrane exhibited excellent mechanical properties, thermal properties, and stability. The nonlinear optical properties of the membrane were characterized over the spectral range of 800 to 1550 nm using open-aperture Z-scan technology. A large nonlinear absorption coefficient of about 10−1 cm GW−1 over the whole tested wavelength range demonstrated the efficient broadband saturable absorptivity of the 2D Te/PVP membrane. Using the 2D Te/PVP membrane as a saturable absorber (SA), a highly stable femtosecond laser with a pulse duration of 829 fs in the communication band was obtained. This work highlights the promise of 2D Te/PVP membranes in ultrafast photonics and Te as a new 2D material for use in photonic devices such as all-optical modulators, switches, and thresholds.
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ANALYTICAL LETTERS
·
2018
·
IF 1.206
Li Chen,Yeqing Xu,Lin Sun,Jiahong Zheng,Jiangdong Dai,Chunxiang Li,Yongsheng Yan
Sulfamethazine, one of the most widely applied feed additives, has been shown to cause negative health effects to humans. In the present work, a novel and facile fluorescence visual detection probe was established to determine sulfamethazine in milk samples with naked-eye detection. Considering the good stability, excellent optical properties, and easy synthesis, blue-emission carbon dots were used as the standard signal and red-emission CdTe quantum dots as the responsive signal for the determination of sulfamethazine. The fluorescence intensity of red-emission CdTe quantum dots was gradually quenched with increasing concentration of sulfamethazine, while the blue-emission carbon dots response remained constant. Apparent color variations were observed by naked-eye detection in the concentration range from 9.0 to 54 µmol · L−1. In addition, the presented strategy was shown to be promising to provide a rapid, facile, and sensitive method for the determination of sulfamethazine in milk samples with few interferences.
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Analytical Methods
·
2019
·Vol. 11
·期 32
·4137-4145
·
IF 2.378
Feng Cui,Qianying Qiu,Gang Peng,Xiaoyan Li,Xi Liu,Xiaojun Chen
The microRNA family shows great promise for the diagnosis and prediction of different cancers as biomarkers, in which miRNA-155 (miR155) is recognized as a biomarker for lung cancer and thus has drawn much attention. Therefore, the development of specific and accurate methods to detect miR155 has become a potential research hotspot. In this work, we presented a fluorescence resonance energy transfer (FRET) technique by utilizing core–shell CdSeTe/ZnS quantum dots (QDs) as a signal reporter and a target recycling strategy as a signal amplifier for the detection of miR155. In the presence of miR155, part of the hairpin probe (HP) immobilized onto the surface of gold nanoparticles (AuNPs)@SiO2, could hybridize with it. Then, numerous H1-AuNPs@SiO2 could be produced with the aid of exonuclease III. With the linkage of the assistant chain A2, H1-AuNPs@SiO2 combined with A1-QDs and then the fluorescence (FL) signal of QDs was quenched by AuNPs@SiO2via FRET. The more miR155 present in solution, the weaker the detected FL signal. A linear response range of 0.01 fM to 1 nM and low detection limit of 3 aM were obtained using the proposed method. Furthermore, this method showed high specificity and satisfactory recovery between 93 and 105% in real human serum samples, illustrating its great potential for practical applications.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 22
·5809-5816
·
IF 3.286
Wei Xiao,Chen Hui
A novel ratiometric fluorescence molecularly imprinted sensor based on a dual-emission quantum dot hybrid was fabricated and used as an alternative analytical tool for the detection of tetracycline. In the synthesis process, red-emitting quantum dots (r-QDs) and green-emitting quantum dots (g-QDs) were modified by two different methods. Afterward, a stepwise precipitation polymerization imprinting reaction was performed to prepare the novel ratiometric fluorescence molecularly imprinted sensor (MIP–g/r-QD sensor). The MIP–g/r-QD sensor integrated the advantages of molecularly imprinted polymers and ratiometric fluorescence probes. The specific recognition sites in the polymer layers could adsorb tetracycline molecules, and then they caused fluorescence quenching behavior of g-QDs via an electron transfer process. Under the optimal conditions, a linear relationship was obtained covering the range from 10 to 160 μmol/L, with a correlation coefficient of 0.9976 and a high imprinting factor of about 3.3. Moreover, the novel MIP–g/r-QD sensor was successfully applied to detect tetracycline in milk samples. This work provides a new way to fabricate an efficient ratiometric fluorescence molecularly imprinted sensor based on quantum dots for convenient, fast, and highly selective and sensitive detection of organic molecules.
A novel ratiometric fluorescence molecularly imprinted sensor based on a dual-emission quantum dot hybrid was fabricated and used as an alternative analytical tool for the detection of tetracycline. AIBN azoisobutyronitrile, EGDMA ethylene glycol dimethacrylate, KH-570 3-(methacryloyloxy)propyltrimethoxysilane, OVDAC octadecyl-4-vinylbenzyldimethylammonium chloride, PDDA poly(diallyldimethylammonium chloride), QD quantum dot, TEOS tetraethoxysilane
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Journal of Analytical Methods in Chemistry
·
2019
·
IF 1.589
Zhihong Wang,Ruiqing Long,Mijun Peng,Te Li,Shuyun Shi
Ferulic acid (FA), an important phenolic acid, is widely distributed in higher plants and presents many pharmacological effects. Therefore, sensitive determination of FA in complex matrix is necessary. Molecularly imprinted polymers-coated CdTe quantum dots (CdTe-QDs@MIPs) exhibited incomparable advantages because of their combination of excellent selectivity of MIPs and high sensitivity of QDs. Here, a fluorescent probe based on CdTe-QDs@MIPs was successfully fabricated for selective and sensitive determination of FA. MIPs shell was obtained by the reverse microemulsion method using FA, 3-(aminopropyl) triethoxysilane (APTES), and tetraethyl orthosilicate (TEOS), as template, functional monomer, and crosslinker. In optimal conditions, the fluorescence CdTe-QDs@MIPs sensor exhibited fast response (within only 3 min), high sensitivity (limit of detection, LOD at 0.85 μg/l), excellent linear ranges (2–100 μg/l) with a correlation coefficient of 0.9996, and distinguished selectivity for FA. Satisfactory recoveries from 91.8% to 110.3% were achieved with precisions below 6.6% for FA analysis in real pineapple juice and apple juice by developed CdTe-QDs@MIPs. The fluorescence results coincided well with those obtained by high-performance liquid chromatography (HPLC). It could be concluded that the resultant CdTe-QDs@MIPs offered a new way for rapid and sensitive analysis of FA in the complex matrix.
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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.
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Journal of Analysis and Testing
·
2017
·Vol. 1
·期 4
·291-297
·
IF 0
Majeed Saadat,Gao Wenyue,Lai Jianping,Wang Chao,Li Jianping,Liu Zhongyuan,Xu Guobao
Abstract Most luminescent glucose sensors based on the interaction of glucose with organic boric acids or borates. Herein, a new luminescent glucose sensor is designed using thioglycolic acid-capped CdTe quantum dots in the presence of cheap inorganic boric acid. Both peak position and intensities change upon the addition of glucose because of the interaction of boric acid with glucose and thioglycolic acid-capped CdTe quantum dots, which enables glucose detection by either color change or intensity change. The luminescent intensities change linearly with glucose concentrations in the ranges from 0.03 to 1 mM and 1–25 mM with a detection limit of 10 µM ( S / N = 3). Moreover, glucose concentrations can be conveniently detected by color change in the range from 1 mM–25 mM. It displays a highly selective response to glucose over other interfering but biologically important saccharides, amino acids, and common ions. Graphical Abstract A thioglycolic acid-capped CdTe QD-based sensor can detect glucose with wide linear range by change in intensity or color in the presence of cheap inorganic boric acid.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Zhaohua Jiang,Jinjin Wen,Huiting Xu,Yufen Zhang,Haonan Zhai,Zhijie Cui,Honghai Wang,Junjie Qi,Wen Liu,Jiapeng Liu
Aqueous zinc-tellurium (Zn-Te) batteries based on conversion reactions between Zn and Te have sparked significant interest due to their cost-effectiveness, high theoretical specific capacity and outstanding safety features. Nevertheless, the sluggish kinetics pose a barrier to the advancement of aqueous Zn-Te batteries. In this study, zero-dimension (0D) nanodots and three-dimensional (3D) nanoflowers molybdenum diselenide (MoSe 2 ) are in situ grown on the holey reduced graphene oxide (HrGO) by a confinement synthesis strategy. Benefiting from the simultaneous presence of (0D/3D)MoSe 2 , excellent conductivity of holey reduced graphene oxide and unique hierarchical structure, the (0D/3D)MoSe 2 @HrGO hybrid greatly promotes the redox kinetics between Zn and Te conversion. Consequently, the constructed aqueous Zn-Te batteries equipped with a Te@(0D/3D)MoSe 2 @HrGO cathode demonstrate remarkable specific capacity (reaching 505 mAh/g at a current density of 0.15 A/g) along with outstanding long-term cycling stability. Additionally, the underlying conversion mechanism has been meticulously explored through extensive analytical techniques. This research introduces an innovative approach to boost the electrochemical performance of aqueous zinc-tellurium batteries.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·
IF 3.1
Xueqiang Chen,Fan Yang,Shiwei Zhao,Xinran Wei,Jiameng Xu,Yunzhe Li,Guanjun Nan,Zhimin Luo,Aiguo Zeng
The residue of ofloxacin (OFL) in animal-derived food would seriously affect human health. This study reports an inexpensive, fast, and simple electrochemical sensor for the sensitive detection of OFL in animal-derived food samples. A poly-L-glutamic acid/poly(sulfobutyl-β-cyclodextrin) CdTe quantum dot-modified electrode P(L-Glu)/SEB-β-CD@CdTeQDs/GCE was prepared by electrochemical polymerization reaction. We investigated the electrochemical behavior of OFL on the sensing electrode by cyclic voltammetry and square wave voltammetry. The results showed that the sensitivity of the sensor was significantly improved under the synergistic effect of L-glutamic acid, sulfobutyl-β-cyclodextrin, and CdTe quantum dot. In addition, the electrochemical reaction process of OFL on the sensing electrode was investigated and the results showed that the transfers of two protons and two electrons were involved in the reaction. Subsequently, the electrochemical sensing method based on P(L-Glu)/SEB-β-CD@CdTeQDs/GCE was developed and validated for the determination of OFL, showing a good linear response in the range of 0.07~1 μg·mL-1 with a detection limit of 3.4 ng·mL-1, and the precision and accuracy were high enough. Compared with the conventional HPLC method, the established electrochemical sensing method shows the merits of eco-friendly, shorter detection time, and much more simple, sensitive, and convenient.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Minghao Ma,Fubin Pei,Wei Hu,Wu Lei,Jiang Wang,Zhaoyang Tong,Bing Liu,Qingli Hao,Xihui Mu
Sensitive and rapid detection of transferrin (TrF) is useful in maintenance of human health. A ratiometric fluorescence imprinted sensor based on nitrogen co-doped carbon dots, red cadmium telluride quantum dots, and boronic acid-functionalized MOF (N-CDs/r-CdTe@MOF-B(OH) 2 @MIP, or NTZ@MIP) for the detection of TrF was constructed via the sol–gel process. Boric acid groups in the MOF-B(OH) 2 carrier improved covalent binding to TrF through affinity interactions. MOF-B(OH) 2 also provided a large specific surface area and porosity that increased the loading of quantum dots (QDs) and improved mass transfer efficiency and analytical sensitivity. N-CDs and r-CdTe acted as fluorophores that emitted at 448 nm and 642 nm, respectively, in the presence of TrF, which facilitated ratiometric fluorescence detection. Under optimized conditions, TrF could be detected in the range 0.05–15 µM, with a lower limit of detection of 0.025 µM. The NTZ@MIP sensor produced satisfactory results in the analysis of TrF-fortified samples of human urine and serum, with recoveries of 93.2 % and 99.6 %, respectively. A smartphone-based TrF sensing platform using NTZ@MIP was also designed and achieved satisfactory results, suggesting that this ratiometric fluorescence imprinted sensor has promising applications in on-site detection of TrF.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yousen Wu,Ying Wang,Guozhe Sui,Dongxuan Guo,Dawei Chu,Guang Xu,Jinlong Li,Yue Li,Dong-Feng Chai
Nowadays, the inherent re-stacking nature and weak d-p hybridization orbital interactions within MXene remains significant challenges in the field of electrocatalytic water splitting, leading to unsatisfactory electrocatalytic activity and cycling stability. Herein, this work aims to address these challenges and improve electrocatalytic performance by utilizing cobalt nanoparticles intercalation coupled with enhanced π-donation effect. Specifically, cobalt nanoparticles are integrated into V 2 C MXene nanosheets to mitigate the re-stacking issue. Meanwhile, a notable charge redistribution from cobalt to vanadium elevates orbital levels, reduces π*-antibonding orbital occupancy and alleviates Jahn-Teller distortion. Doping with tellurium induces localized electric field rearrangement resulting from the changes in electron cloud density. As a result, Co-V 2 C MXene-Te acquires desirable activity for hydrogen evolution reaction and oxygen evolution reaction with the overpotential of 80.8 mV and 287.7 mV, respectively, at the current density of −10 mA cm −2 and 10 mA cm −2 . The overall water splitting device achieves an impressive low cell voltage requirement of 1.51 V to obtain 10 mA cm −2 . Overall, this work could offer a promising solution when facing the re-stacking issue and weak d-p hybridization orbital interactions of MXene, furnishing a high-performance electrocatalyst with favorable electrocatalytic activity and cycling stability.
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TALANTA
·
2025
·
IF 6.1
Yun Wen,Li-Ping Wang,Yong-Liang Yu,Shuai Chen
Accurate and timely detection of ions and metabolites in urine is essential for health monitoring. However, traditional methods face challenges in integrating multiplexity, signal stability, and portability. To address these issues, this study developed a 3D-printed portable dual-mode gel microspheres kit. The hydrogel microspheres were prepared by encapsulating the respective indicators: Urine pH Indicator (UpHI) for pH detection, Urine Calcium Ion Indicator (UCaI) for Ca 2+ detection, and Urine Creatinine Indicator (UCrI) for creatinine detection. Each indicator was optimized for its specific target to ensure high sensitivity and selectivity. The system employs dual-mode UV and visible light analysis, combined with smartphone imaging and RGB data processing, ensuring rapid, intelligent, and high-throughput detection. The integration of gel microspheres with a 3D-printed microdevice enhances the portability and user-friendliness of the detection system. This design facilitates long-term storage and transportation while ensuring usability for non-technical individuals in home settings. The kit demonstrated excellent encoding capacity, maintained stable signals for up to a week, and achieved integrated detection, data acquisition, and analysis within approximately 6 min. The cost per microsphere is under $0.20, making it a cost-effective solution. In conclusion, this method offers an effective solution for portable and timely urine health monitoring in home settings and provides a promising approach for the future development of portable kits with expanded detection pathways.
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