SENSORS AND ACTUATORS B-CHEMICAL
·
2016
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IF 4.758
Yecang Tang,Yi Ding,Ting Wu,Liying Lv,Zhicheng Yan
Hybrid microgels with Au nanoparticles (AuNPs) immobilized in poly( N -isopropylacrylamide- co -2-(dimethylamino)ethylmethacrylate) (P(NIPAM- co -DMA)) microgels have been prepared. The as-synthesized hybrid microgels showed excellent thermo- and pH-responsive properties and high stabilities. 1-pyrenebutyric acid (PBA) molecules were then adsorbed on the AuNP surfaces via electrostatic interactions to form PBA-AuNPs/P(NIPAM- co -DMA) composites that were used as probes for the detection of Hg 2+ . The fluorescence of PBA was effectively quenched through fluorescence resonance energy transfer between AuNPs and PBA molecules. However, the addition of Hg 2+ ions caused the fluorescence turn-on dramatically and 16 times fluorescence enhancement was obtained, which is attributed the fact that Hg 2+ ions replace the adsorbed PBA molecules. Under the optimal conditions, the fluorescence intensity was proportional to the concentration of Hg 2+ ions in the range of 0.16–1.60 μM with a detection limit of 31 nM. Meanwhile, some other metal ions did not interfere with the detection of Hg 2+ , suggesting a good selectivity for Hg 2+ ions sensing.
研究领域:
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
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Jianing Li,Dongkui Zhang,Jiangbin Xia
Herein, hydrothermal method was used to prepare a series of multi-color polythiophene modified carbon quantum dots. Under UV excitation, fluorescence their maximum emission wavelengths appear at 612 nm, 570 nm, and 540 nm respectively. The prepared CD-BTH and CD-BN can have specific detection of Au 3+ and Hg 2+ through fluorescence quenching effect. The detection limits for Au 3+ are 3 nM and 5.4 nM respectively, and for Hg 2+ are 23 nM and 90 nM respectively. CD-KN detects Au 3+ specifically through fluorescence resonance, with a detection limit of 33 nM. Under the interference of other metal ions, three types of polythiophene modified quantum carbon dots exhibit excellent selectivity for the responsive ions. Meanwhile, this article also elucidates the law that as the electron withdrawing ability of the side chains of polythiophene derivatives increasing, the fluorescence emission peaks of the prepared polythiophene modified carbon dots shifts red and the fluorescence quantum yield is higher.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Hao Wang,Xiuli Wang,Maosheng Liang,Guang Chen,Rong-Mei Kong,Lian Xia,Fengli Qu
Mercury detection remains an important task because of its high toxicity. Herein a new dual-signal probe based on a boric acid (BA)-functionalized lanthanide metal–organic framework (BA-Eu-MOF) was developed for the detection of Hg2+ and CH3Hg+ ions for the first time. The BA-Eu-MOF was synthesized by coordination of Eu3+ with 5-boronobezene-1, 3-dicarboxylic acid (5-bop) through a one-pot method. The 5-bop ligand not only acted as the “antenna” to sensitize the luminescence of Eu3+ but also provided reaction sites for Hg2+ and CH3Hg+. Owing to the electron-withdrawing effect of the BA group, the “antenna” effect of the ligand was passivating and the BA-Eu-MOF showed weak red emission in water. Upon addition of Hg2+ or CH3Hg+ into the system, a transmetalation reaction took place, i.e., BA groups were replaced by Hg2+ or CH3Hg+; therefore, the “antenna” effect of the ligand was triggered, leading to the enhancement of red emission. As Hg2+ or CH3Hg+ concentration increased, the red emission was gradually enhanced, and the color change was also observed with the naked eye under 365 nm ultraviolet light. Owing to the porous characteristics and the surface effect of the MOF, as well as the unique transmetalation reaction between the BA group and Hg2+ or CH3Hg+, the developed nanoprobe showed excellent characteristics for simultaneous detection of Hg2+ and CH3Hg+, such as simple preparation, convenient operation, “turn-on” signal output, high sensitivity, and selectivity. The unique features of the BA-Eu-MOF make it an attractive probe for monitoring Hg2+ and CH3Hg+.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2024
·
IF 1.8
Liu Xing,Liu Zhen,Pan Yiliang,Xiao Xilin
Construct a sensitive and rapid detection fluorescence biosensor with the assistance of exonuclease III to achieve efficient detection of Hg 2+ . Nucleic acid aptamer H0 specifically recognizes Hg 2+ , and under the action of exonuclease III, H0 bound to Hg 2+ is hydrolyzed, which in turn fails to trigger the catalytic hairpin self-assembly amplification reaction, resulting in a decrease in the number of double-stranded DNA bound to the fluorescent dye SYBR Green I in the solution, and a decrease in the fluorescence intensity. The results showed that the concentration of Hg 2+ showed a good linear relationship with the fluorescence intensity of the sensing system within the range of 3.8–10 pmol/L, and the detection limit was 0.53 pmol/L. The recoveries of Xiangjiang River water used for the analysis of the actual samples were in the range of 99.57–103.58%, and the relative standard deviations of the determined values were 2.4–3.7%. The method is simple, sensitive, specific, cost-effective and can be applied to water samples. Graphical abstract
研究领域:
分析化学
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环境科学
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生物技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qi Lian,Han Liu,Xuefang Zheng,Xiaoming Li,Fengjie Zhang,Jing Gao
A general method for the preparation of Pt doped CuO/Pt nanoflowers (CuO/Pt NFs) for peroxidase mimicking has been demonstrated via hydrothermal method . Pt ions could be reduced to Pt nanoparticles by using the ascorbic acid (AA) as reducing agent and Pt ions were uniformly doped in the CuO nanoflowers by using the bovine serum albumin (BSA) as the stabilizer . The obtained CuO/Pt NFs exhibited a higher peroxidase-like catalytic activity than individual CuO and Pt nanoparticles alone, which could be ascribed to their synergistic effect. In the presence of hydrogen peroxide (H 2 O 2 ), the CuO/Pt NFs could catalyze the oxidation of chromogen 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue color product. The peroxidase activity of CuO/Pt NFs was selectively inhibited by Hg 2+ due to form the CuO/Pt-Hg trimetallic amalgam . However, the inhibition was not affected by other metal ions . Therefore, a novel colorimetric biosensor was developed for sensitive detection of mercuric ions by using CuO/Pt NFs. This method exhibited a wide response linear range, low limit of quantification values, excellent sensitivity and selectivity for detection of Hg 2+ in various ground water samples, which was verified with CVAAS. With the advantages of rapid response, simple operation, naked-eye observation and low cost, the colorimetric CuO/Pt NFs sensor showed bright prospects for detection of Hg 2+ in various water samples and public drinking water distribution systems .
研究领域:
环境科学
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生物化学
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DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 21
·2599-2605
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IF 3.1
Yanli Li,Yanmei Si,Genmei Yang,Lixia Yang,Hua Wang
A target-responsive ratiometric fluorimetric sensing strategy for Hg2+ has been rationally designed. The sensing probe was established based on a functionalized metal–organic framework, which was prepared with 3,5-dicarboxyphenylboronic acid (DCPB) as the functional ligand and Eu3+ as the metal junction. The porous nano-spheres of Eu-MOF with an arylboronic acid as the functional recognition group for Hg2+ exhibited tunable optical properties with dual emission fluorescence signals at 338 nm and 615 nm. In the presence of Hg2+, arylmercury was formed by a specific transmetalation reaction between Hg2+ and arylboronic acid groups, which blocks the energy transfer between the ligand and Eu3+. Thereby, the fluorescence signal of Eu-MOF/BA at 615 nm decreased, while the fluorescence signal at 338 nm remained almost constant. The ratiometric fluorimetric sensing for Hg2+ was achieved by calculating the peak intensity ratio of F615/F338 based on the reference signal at 338 nm and the response signal at 615 nm. The detection limit of Hg2+ was as low as 0.0890 nM, and the recovery rate of the actual environmental water sample ranged from 90.92% to 118.50%. Therefore, the excellent performance of the ratiometric fluorimetric sensing method for Hg2+ makes it attractive for the detection of heavy metal ions in environmental monitoring.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Huanhuan Li,Qiyi Bei,Wenhao Zhang,Murugavelu Marimuthu,Md. Mehedi Hassan,Suleiman A. Haruna,Quansheng Chen
Mercury (Hg 2+ ) is a potentially toxic heavy metal ion found to be drastically deleterious to humans. Herein, an ultrasensitive fluorescence sensor was developed using three-dimensional upconversion nanoclusters (EBSUCNPs) and aptamer-modulated thymine-Hg 2+ -thymine strategy. The EBSUCNPs were used as the energy donors, the PDANPs served as the acceptors, and the aptamer was applied as an identification tag for Hg 2+ . Due to the energy transfer effect, the fluorescence of EBSUCNPs can be effectively quenched by Polydopamine nanoparticles (PDANPs). In the existence of Hg 2+ , T (thymine)-rich aptamers between EBSUCNPs and PDANPs were hybridized with Hg 2+ to yield thymine-Hg 2+ -thymine and folded back to hairpin structure, causing PDANPs to detach from the EBSUCNPS and the recovery of fluorescence. Under optimum conditions, the linear sensing range of Hg 2+ was 0.5–20 µg/L, and the detection limit was 0.28 µg/L. Furthermore, it exhibited excellent selectivity and anti-interference, which made it an ideal method for identifying Hg 2+ in spiked samples.
研究领域:
分析化学
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环境科学
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食品安全
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纳米技术
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Runzi Zhang,Jia Yang,Yongguo Cao,Qianyan Zhang,Chenfeng Xie,Wanyi Xiong,Xiaojun Luo,Yi He
Biomimetic inorganic nanoenzyme is a kind of nanomaterial with long-term stability, easy preparation and low cost, which could instead of natural biological enzyme. Metal-organic framework (MOFs) as effectively nanoenzyme was attracted more attention for the adjustability and large specific surface area. This design is based on the catalase-like catalytic activity of 2D metal–organic frameworks (MOFs) and the high sensitivity of surface enhanced Raman spectroscopy (SERS) biosensors to construct a novel SERS biosensor capable of efficiently detecting mercury (Hg 2+ ). In this study, 2D MOFs nanozyme was instead of 3D structure with more effecient catalytic site, which can catalyze o-Phenylenediamine (OPD) to OPDox with the assistance of H 2 O 2 . Besides, a magnetic composite nanomaterial Fe 3 O 4 @Ag@OPD was prepared as a signal carrier. In the presence of Hg 2+ , T-Hg 2+ -T base pairs were used to connect the two materials to realize Raman signal change. Based on this principle, the SERS sensor can realize the sensitive detection of Hg 2+ , the detection range is 1.0 × 10 -12 ∼ 1.0 × 10 -2 mol‧L -1 , and the detection limit is 1.36 × 10 -13 mol‧L -1 . This method greatly improves the reliability of SERS sensor for detecting the target, and provides a new idea for detecting metal ions in the environment.
研究领域:
生物化学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Jialing Zhou,Hui Huang,Qian Wang,Zhirui Li,Shunji Chen,Jun Yu,Yuan Zhong,Jing Chen,Huolin Huang
Owing to the separation of field-effect transistor (FET) devices from sensing environments, extended-gate FET (EGFET) biosensor features high stability and low cost. Herein, a highly sensitive EGFET biosensor based on a GaN micropillar array and polycrystalline layer (GMP) was fabricated, which was prepared by using simple one-step low-temperature MOCVD growth. In order to improve the sensitivity and detection limit of EGFET biosensor, the surface area and the electrical conductivity of extended-gate electrode can be increased by the micropillar array and the polycrystalline layer, respectively. The designed GMP-EGFET biosensor was modified with l-cysteine and applied for Hg2+ detection with a low limit of detection (LOD) of 1 ng/L, a high sensitivity of −16.3 mV/lg(μg/L) and a wide linear range (1 ng/L-24.5 μg/L). In addition, the detection of Hg2+ in human urine was realized with an LOD of 10 ng/L, which was more than 30 times lower than that of reported sensors. To our knowledge, it is the first time that GMP was used as extended-gate of EGFET biosensor.
研究领域:
生物传感技术
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材料科学
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环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Haiyu Li,Wan Wang,Zhijuan Wang,Qing Lv,Hua Bai,Qing Zhang
CdSe/ZnS quantum dots (QDs) and 3,3,5,5-tetramethylbenzidine (TMB) were incorporated into a filter paper to produce a paper-based colorimetric device for Hg 2+ detection. Under visible light, the CdSe/ZnS QDs acted as a photocatalyst to oxidize TMB, resulting in blue colorization on the paper. Moreover, Hg 2+ could enhance the photocatalytic activity of CdSe/ZnS QDs and consequently caused an increase in the color intensity of the paper. The color change of the paper-based device can be directly identified by naked-eye observation or captured by a smartphone and analyzed using image processing software for quantitative analysis. Under optimal conditions, a low detection limit of 0.09 µM was achieved. This device was applied for real samples, including tap water and cosmetics, and achieved satisfying results.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 23
·3567-3576
·
IF 8.683
Peng-Fei Li,Chun-Li Hu,Fang Kong,Jiang-Gao Mao
The exploration of new birefringent materials in the d10 transition metal sulfate selenite system resulted in three new compounds, namely, Hg2(SeO3)(SO4), La2Hg3(SeO3)4(SO4)2(H2O)2 and Ag2Cd(Se2O5)(Se0.3S0.7O4), using mild hydrothermal methods. Hg2(SeO3)(SO4) shows a 3D structure composed of 2D mercury selenite layers connected by 1D mercury sulfate chains; La2Hg3(SeO3)4(SO4)2(H2O)2 features a novel 3D network composed of 1D lanthanum sulfate chains and 2D mercury oxide layers, which are connected by a SeO3 triangular pyramid bridge; Ag2Cd(Se2O5)(Se0.3S0.7O4) exhibits a novel 3D framework that consists of selenate silver layers bridged by SO4 tetrahedra and CdO6 octahedra. These compounds can remain stable above 250 °C and their optical band gap values are larger than 3.5 eV. The birefringence (Δn) of Hg2(SeO3)(SO4) was calculated to be 0.133 at 532 nm and 0.126 at 1064 nm. Hg2(SeO3)(SO4) was proved as the first reported metal selenite sulfate exhibiting a large birefringence. In addition, the IR spectra, TG-DSC curves and theoretical calculations of the three compounds were studied.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 11
·8484-8491
·
IF 3.086
MeiMei Liu,Gang Li,ZhuHong Cheng
Herein we develop a dual-functional fluorescent chemosensor R/Au/Tb-BTC. This chemosensor was prepared by immobilizing rhodamine derivative probes (R) onto the surface of the metal–organic framework Tb-BTC via Au nanoparticles (Au NPs). The chemosensor was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and the UV-vis spectrum. R/Au/Tb-BTC was applied in the detection of nitroaromatic compounds and Hg2+, which were detected by Tb-BTC and R respectively. Nitroaromatic compounds, such as 2,4,6-trinitrotoluene (TNT), nitrobenzene (NB) and 4-nitrophenol (PNP), could reduce the fluorescence intensity of R/Au/Tb-BTC in ethanol solution. Thus R/Au/Tb-BTC can selectively and sensitively detect nitroaromatic compounds, especially TNT. Meanwhile, R/Au/Tb-BTC exhibits both fluorescence and colorimetric properties for the detection of Hg2+ in aqueous solution. It presents excellent anti-disturbance ability when exposed to a series of competitive cations such as Na+, K+, Ag+, Li+, Ba2+, Ca2+, Pb2+, Cd2+, Co2+, Cu2+, Mg2+, Mn2+, Ni2+, and Zn2+. More importantly, when TNT and Hg2+ coexist in ethanol solution, the two pollutants can be detected using one chemosensor R/Au/Tb-BTC.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）