JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5946-5954
·
IF 2.1
Lu Yuting,Bian Zhenglan,Chu Fenghong,Lu Jianwei,Hou Guoqiang,Hou Shili
In this paper, a hydrothermal strategy is reported for the synthesis of nitrogen-doped carbon dots (NCD) which used citric acid (CA) and urea as reactants with different pristine molar ratios of carbon/nitrogen atoms (C/N). The fluorescence emission wavelength of the aqueous solutions of NCD can be tuned from 462 to 546 nm under a single and uniform UV light excitation (365 nm). Through many characterization analysis methods, it is demonstrated that graphitic N and C=O extended the effective conjugation length which reduced the energy gap between the highest occupied molecular orbital (HUMO) and the lowest unoccupied molecular orbital (LUMO). This is considered to be responsible for the redshift and tunability of the fluorescence emission of NCDs with different C/N molar ratios. This will be useful for designing a synthetic strategy of long-wavelength fluorescence emission carbon dots (CDs) in a non-benzene ring precursor system. As a potential fluorescence sensor, the as-prepared NCDs can specifically detect Fe 3+ ions and Al 3+ ions in aqueous solutions. Additionally, the NCDs not only are nontoxic but also exhibit large and stable fluorescence intensity, indicating that they have broad potential application in the fields of sensors and optoelectronic devices.
研究领域:
材料科学
·
分析化学
·
生物传感
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Lin Wang,Xue Gong,Qijing Bing,Guang Wang
An asymmetrical oxadiazole derivative (Sensor 1 ) containing one pyridine and one formyl connecting to two benzene rings on both sides of oxadiazole unit was designed and synthesized. Sensor 1 displayed selective colorimetric sensing for Co 2+ and Cu 2+ ions via color changes to blue and yellow from colorless in CH 3 CN solutions, respectively. Sensor 1 not only exhibited an instantaneous naked-eye color change and but also could be used as a convenient test kit for recognition and detection of Co 2+ ions. Sensor 1 presented high colorimetric sensitivity for Co 2+ with low detection limit (3.92 × 10 −6 mol/L). Sensor 1 also displayed “On-Off” fluorescent sensing for Cu 2+ over a wide range of competitive metal ions and could accurately detect the existence of Cu 2+ in water samples via the fluorescent quenching and color change. The fluorescence intensity of sensor 1 in CH 3 CN solution showed a linear response to Cu 2+ in the wide concentration range of 0–40 μM which is beneficial for quantitative analysis. The studies on absorbance and fluorescence titration, 1 H NMR spectrum and ESI-MS spectra confirmed that colorimetric sensing for Co 2+ and fluorescent sensing for Cu 2+ are ascribed to the complex formation with the stoichiometry of 1:1 for Co 2+ and 1:2 for Cu 2+ .
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Pengcheng Yin,Qingfen Niu,Tao Wei,Tianduo Li,Yang Li,Qingxin Yang
A new thiophene-based colorimtric and fluorimetric dual functional sensor TSA was synthesized, which can highly sense Al 3+ and Cu 2+ ions in aqueous solution through two approaches: a significant fluorescence enhancement caused by Al 3+ and a visible color change from colorless to yellow induced by Cu 2+ . The sensor TSA showed a highly binding affinity only toward Al 3+ and Cu 2+ even in the presence of other competitive metal ions with low detection limits of 49 nM and 0.217 μM, respectively. The mechanisms of TSA for sensing Al 3+ and Cu 2+ were based on the metal ions coordination of TSA , which have been demonstrated by HR ESI-MS and 1 H NMR titration. In addition, sensor TSA was successfully applied to quantify Al 3+ and Cu 2+ in environmental water and food samples with good precision and accuracy. Moreover, the TSA -based test stips/silica can conveniently and practically detect and discriminate Al 3+ and Cu 2+ in water. Furthermore, sensor TSA has also been applied to detect Al 3+ in live HeLa cells. This work provides a new approach with easily synthetic route and economically cheap for ultrasensitive, selective, quantitative and differentiable detection of Al 3+ and Cu 2+ in environmental, food and biological systems.
研究领域:
分析化学
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生物医学
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环境科学
✓ 已验证
DOI
高影响因子
Micromachines
·
2023
·Vol. 14
·期 8
·1497
·
IF 3.4
Mingpeng Yang,Nan Sun,Xiaochen Lai,Yanjie Li,Xingqiang Zhao,Jiamin Wu,Wangping Zhou
Human sweat is intricately linked to human health, and unraveling its secrets necessitates a substantial volume of experimental data. However, conventional sensors fabricated via complex processes such as photolithography offer high detection precision at the expense of prohibitive costs. In this study, we presented a cost-effective and high-performance wearable flexible sweat sensor for real-time monitoring of K+and Na+concentrations in human sweat, fabricated using screen printing technology. Initially, we evaluated the electrical and electrochemical stability of the screen-printed substrate electrodes, which demonstrated good consistency with a variation within 10% of the relative standard deviation (RSD), meeting the requirements for reliable detection of K+and Na+in human sweat. Subsequently, we employed an “ion-electron” transduction layer and an ion-selective membrane to construct the sensors for detecting K+and Na+. Comprehensive tests were conducted to assess the sensors’ sensitivity, linearity, repeatability, resistance to interference, and mechanical deformation capabilities. Furthermore, we evaluated their long-term stability during continuous monitoring and storage. The test results confirmed that the sensor’s performance indicators, as mentioned above, met the requirements for analyzing human sweat. In a 10-day continuous and regular monitoring experiment involving volunteers wearing the sensors, a wealth of data revealed a close relationship between K+and Na+concentrations in human sweat and hydration status. Notably, we observed that consistent and regular physical exercise effectively enhanced the body’s resistance to dehydration. These findings provided a solid foundation for conducting extensive experiments and further exploring the intricate relationship between human sweat and overall health. Our research paved a practical and feasible path for future studies in this domain.Keywords:wearable sweat sensor;screen-printing technology;hydration status;potassium ion detection;sodium ion detection
研究领域:
生物医学工程
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Mengyuan Yin,Yaxing Zhang,Hanxue Liang,Chang Liu,Yanhui Bi,Juanjuan Sun,Weiwei Guo
Stimuli-responsive DNA hydrogels have shown great potential in sensing applications due to their attractive properties such as programmable target responsiveness, excellent biocompatibility, and biodegradability. In contrast to the extensively developed DNA hydrogel sensing systems based on the stimuli-responsive hydrogel-to-solution phase transition of the hydrogel matrix, the quantitative sensing application of DNA hydrogels exhibiting smart shape deformations has rarely been explored. Moreover, bulk DNA hydrogel-based sensing systems also suffer from high material cost and slow response. Herein, free-standing bilayer polyacrylamide/DNA hybrid hydrogel films with programmable responsive properties directed by the sequence of functional DNA units have been constructed. Compared with bulk DNA hydrogels, these DNA hydrogel films with a thickness at the micrometer scale not only greatly reduce the consumption of DNA materials but also facilitate the mass transfer of biomacromolecular substances within the hydrogel network, thus favoring their sensing applications. Therefore, a target-responsive smart DNA hydrogel film-based sensor system is further demonstrated based on the large amplitude macroscopic shape deformation of the film as a visual signal readout. As a proof of concept, Pb2+ or UO22+ ion-responsive DNA units were introduced into the active layer of the bilayer hydrogel films. In the presence of Pb2+ or UO22+ ions, the occurrence of a cleavage reaction within the DNA units leads to the release of DNA segments from the hydrogel film, inducing a dramatic shape deformation of the film, and thus sensing of Pb2+ or UO22+ ions with high specificity is achieved based on measuring the bending angle changes of these smart free-standing films. These smart DNA hydrogel film sensors with target-programmable responsiveness, simple operation, and ease of storage may hold promise for future rapid on-site testing applications.
研究领域:
生物化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junkai Hao,Hanning Song,Shuo Sun,Jing Feng,Hongben Zhang,Xuewan Zhang,Xuejiao Ren,Zhengquan Yan,Lei Hu
To improve the sensitivity and selectivity for S 2− and Fe 2+ detection in complex agricultural products, ultra-small nano CeO 2 /CuO doped carboxylated chitosan fibers (CeO 2 /CuO CCF) was constructed under microwave-assisted conditions. Not only did CeO 2 /CuO CCF possess suitable BET specific surface area, superior stability and synergistic-enhancement oxidase-like activity, trace S 2− or Fe 2+ could selectively change its oxidase-like activity accompanying with visible color changes. Under the optimized conditions, there express specific double ratiometric colorimetric linear relationships between lg( A 729 / A 343 )/lg( A 415/ A 343 ) and c S 2− or c Fe 2+ with large linear ranges. When applied for visual monitoring of S 2− and Fe 2+ in real agricultural products, the detection limits were low to 3.5 × 10 −9 mol·L −1 and 9.4 × 10 −8 mol·L −1 respectively, far below the permitted values in drinking water by World Health Organization. The mechanisms for synergistic-enhancement oxidase-like activity for CeO 2 /CuO CCF to selectively recognize S 2− and Fe 2+ were proposed. This work will provide an efficient way for visual monitoring of multiple analytes in complex agricultural products.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaoming Yuan,Xiuwen Wu,Yunhan Ling,Shilin Li,Jianyue Chen,Zhengjun Zhang
Rapid, sensitive, and on-site detection of heavy metal ions in the environment is of great significance for protecting human health and maintaining ecological balance. This work presents a novel approach for the synthesis of nitrogen and bismuth co-doped, homogeneous porous petaloid graphene on polyimide films through ion exchange plating and laser direct writing techniques. The electrochemical sensing platform constructed by this technique exhibits excellent detection performance for trace amounts of the heavy metals lead and cadmium ions. Particularly, the mild surface ion exchange and self-metallization strategy enables in situ incorporation of bismuth elements with ultra-low material consumption. At the same time, the laser direct writing method can be utilized to create multiple electrode patterns, enhancing the sensor’s versatility. The synergistic effect between the homogeneous porous structure of graphene and the abundant bismuth and nitrogen functional groups endows the new micro-electrochemical sensor with satisfactory sensing performance for simultaneous detection of Cd 2+ and Pb 2+ using differential pulse stripping voltammetry. The fabricated sensor exhibits superior performance with a linear range of 1.0–100.0 μg/L, a detection limit of 0.207 μg/L and 0.410 μg/L (S/N = 3) for Cd 2+ and Pb 2+ , respectively, and demonstrates good anti-interference capability, stability, and repeatability. When applied to detecting Cd 2+ and Pb 2+ in actual porcelain applique and tea samples, it demonstrates good recovery rates ranging from 95.3% to 106.3%. Consequently, this portable and sensitive micro-electrochemical sensor based on laser-induced graphene shows promising potential for application in environmental monitoring and protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Bisang Chen,Feiming Li,Liling Zou,Dejian Chen
Hydrogen bonding interactions guided supramolecular self-assembly has been widely studied, which played important roles in the field of nanotechnology and nanodevices. Herein, an effective intermolecular hydrogen bonding mediated heating-up synthesis of high-quality fluorescent carbon dots (CDs) is developed based on hydrogen-bonding between trimesic acid and urea. Upon optimizing the hydrogen-bonding interaction, high quality of CDs with high monodispersity and stability could be obtained. Besides, these CDs could be used for sensitive and specific detection of ferric ions. The novel strategy may pave a new way in molecular engineering for the fabrication of high quality of CDs.
研究领域:
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Crystals
·
2023
·Vol. 13
·期 5
·812
·
IF 2.7
Yuanyuan Xiong,Mengxiao Chen,Zhen Mao,Yiqing Deng,Jing He,Huaixuan Mu,Peini Li,Wangcai Zou,Qiang Zhao
Carbon dots have drawn extensive attention in the detection of metal ions with good stability, excellent biocompatibility and low toxicity. Meanwhile, the quantum yield, response rate and the detection mechanism for Cu2+ions are vital to their development and application. To obtain more selective and sensitive materials to detect Cu2+ions, N-doped carbon dots (DN-CDs) were synthesized by a one-step hydrothermal method using citric acid as the carbon source and diethylenetriamine (DETA) as the nitrogen source. The obtained DN-CDs exhibited stable and intense blue light emission and special near-infrared up-conversion fluorescence at 820 nm, attributed to the effect of introducing N atoms into the structure of carbon dots. Due to the dynamic quenching of the DN-CDs by Cu2+ions, the fluorescence intensity (λex = 820 nm) of DN-CDs was quantitatively decreased in the presence of Cu2+ions. The DN-CDs had a rapid response within 3 min. The DN-CD system exhibited a linear relationship with a concentration range from 2.5 to 50 µM and low detection limit (LOD) of 42 nM. After careful investigation, an interesting conclusion was proposed: N-doped CDs with N/O = 1:1 or higher with relatively abundant N atoms prefer to detect Cu2+ions while those with N/O = 1:2 or lower prefer to detect Fe3+ions.Keywords:carbon dots;up-conversion fluorescence;Cu2+ions detection
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Rumeng Gao,Yayu Feng,Yunfei Liu,Lin Wang,Kuilin Deng
In this study, poly( 2, 4 -thiazolidinedione) (PTD) is prepared by oxidative polymerization using 2,4 -thiazolidinedione (TD) as monomer. PTD exhibits significant polymerization-induced emission (PIE) at 540 nm, resulting from the intramolecular aggregation of thiazole heterocycles and the formation of electron-space conjugation. The PIE-active PTD demonstrates simultaneously specific detection of Cu 2 ⁺/Co 2 ⁺ with detection limits as low as 0.47 µ M and 68.9 nM, respectively, even in the presence of 14 common metal ions and 11 anions. Fluorescence quenching experiments reveal that Cu 2 ⁺/Co 2 ⁺ coordinates with PTD to form a 1:2 non-fluorescent complex through a static quenching mode. Most importantly, the efficient differentiation between Cu 2 ⁺ and Co 2 ⁺ is achieved using dynamic color recognition technology based on smartphone APP and UV–vis absorption spectroscopy. This approach innovatively combines solution color gradient change with smartphone RGB to establish a semi-quantitative and convenient detection method. The lower detection limits of Cu 2 ⁺/Co 2 ⁺ reached 36.2 and 37.8 nM m with naked eye recognition, which provides a technological solution for the rapid detection of Cu 2 ⁺/Co 2 ⁺ ions without the aid of large-scale instruments. In brief, the successful preparation and detection application of PIE-active PTD open up a straightforward and feasible path for molecular design of fluorescent non-conjugated polymers from non-fluorescent monomers.
研究领域:
高分子化学
·
分析化学
·
荧光材料
·
传感器与生物传感器
·
环境监测
·
光学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Taiyi Chen,Xiaoping Lin,Peisong Li,Wei Liu,Lu Jiang,Leyuan Huang,Zhongliang Li,Ruirui Zhu,Zhi-Liang Chen,Rongying Zeng,Mengqin Liu,Wen Chen
The precise detection of metal ions is crucial in food safety, biomedical diagnostics, and environmental monitoring. Although traditional “on-off” fluorescence probes are frequently utilized, their anti-interference capability remains a limitation. This study synthesized three new copper-based fluorescent probes: PTA, PTP, and PTD. Among them, PTD exhibited unique aggregation-induced emission (AIE) properties. PTD's remarkable selectivity for Zn 2+ was due to the formation of Zn 2+ -induced J-aggregates, which resulted in a concentration-dependent fluorescence redshift from green to yellow and then to red. Additionally, PTD demonstrated a rapid and sensitive response to Cu 2+ , and it was successfully integrated into a smartphone-based platform for the semi-quantitative detection of Zn 2+ and Cu 2+ in real food samples. The effectiveness in biological applications was also validated through live-cell imaging tests. This work contributes to the creation of highly selective and interference-resistant ratiometric fluorescence sensors by leveraging the special process of target metal ion-induced J-aggregate production in AIE-based probes.
研究领域:
分析化学
·
材料科学
·
生物化学
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环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-15
·
IF 5.3
Guo Jieli,Li Jin,Xing Xiujing,Xiong Wei,Li Hao
As an ideal transition metal oxide, Co 3 O 4 is a P-type semiconductor with excellent electrical conductivity, non-toxicity and low cost. This work reports the successful construction of Co 3 O 4 materials derived from metal-organic frameworks (MOFs) using a surfactant micelle template-solvothermal method. The modified electrodes are investigated for their ability to electrochemically detect Pb 2+ and Cu 2+ in aqueous environments. By adjusting the mass ratios of alkaline modifiers, the morphological microstructures of Co 3 O 4 -X exhibit a transition from distinctive microspheres composed of fiber stacks to rods. The results indicate that Co 3 O 4 -1(NH 4 F/CO(NH 2 ) 2 = 1:0) has a distinctive microsphere structure composed of stacked fibers, unlike the other two materials. Co 3 O 4 -1/GCE is used as the active material of the modified electrode, it shows the largest peak response currents to Pb 2+ and Cu 2+ , and efficiently detects Pb 2+ and Cu 2+ in the aqueous environment individually and simultaneously. The linear response range of Co 3 O 4 -1/GCE for the simultaneous detection of Pb 2+ and Cu 2+ is 0.5–1.5 μM, with the limits of detection (LOD, S/N = 3) are 9.77 nM and 14.97 nM, respectively. The material exhibits a favorable electrochemical response, via a distinctive Co 3 O 4 -1 microsphere structure composed of stacked fibers. This structure enhances the number of active adsorption sites on the material, thereby facilitating the adsorption of heavy metal ions (HMIs). The presence of oxygen vacancies (O V ) can also facilitate the adsorption of ions. The Co 3 O 4 -1/GCE electrode also exhibits excellent anti-interference ability, stability, and repeatability. This is of great practical significance for detecting Pb 2+ and Cu 2+ in real water samples and provides a new approach for developing high-performance metal oxide electrochemical sensors derived from MOFs. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 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）