MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Chenxi Wang,Pengcheng Zhao,Li Zhang,Yilin Wang,Qian Fu,Rongjie Li,Jiaodi Li,Chunyan Li,Yixi Xie,Junjie Fei
In this paper, a temperature-controlled “On-Off” electrochemical sensor for the detection of hydroquinone (HQ) is constructed by using a composite film of temperature-sensitive polymer poly (N-vinylcaprolactam) (PNVCL), the nanomaterial rGO@Au and the monoclinic bismuth metavanadate (m-BiVO 4 ). The sensor exhibits good temperature sensitivity and reversibility. When the temperature drops below the Lowest Critical Solution Temperature (LCST) of the PNVCL, the PNVCL will be in a “stretched” state, which hinders the electron exchange between hydroquinone and the surface of the electrode, presenting an “Off” state for the sensor. On the contrary, when the temperature exceeds the LCST, the PNVCL will be in a “contracted” state, which hydroquinone can perform an effective redox process and generate a response current, showing an “On” status. Due to the good electroconductivity and electrocatalytic ability of rGO@Au and m-BiVO 4 , the proposed sensor showed excellent detection performances. Hence, the sensor shows wide linear ranges (2.0 to 30.0 μM and 30.0 to 152.0 μM) and low limit of detection (0.6 μM). In addition, the “On-Off” electrochemical sensor may provide new ideas for the application of intelligent polymers.
研究领域:
分析化学
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材料科学
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环境监测
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Yeru Liu,Sisi Si,Shengyi Dong,Bozhi Ji,Huimin Li,Song Liu
In this work, an ultrasensitive and low-cost electrochemical immunosensor has been constructed for ProGRP detection. The prepared three-dimensional reduced graphene oxide-gold nanoparticles (3D-rGO@Au) composite as substrate materials were applied for electrode modification, which can enhance electrical conductivity and enlarge the effective surface area for immobilizing capture antibody. Detection antibody-coated non-conductive SiO 2 nanospheres were used for specifically recognize ProGRP and form a sandwich structure. The electrochemical response signal of the sandwich-type immunosensor was based on the electron transferability between the electrode and [Fe(CN) 6 ] 3−/4− . 3D-rGO@Au can significantly increase the initial current, while SiO 2 can greatly reduce the response current. The combined effects of these nanomaterials can thus effectively enhance the sensitivity. Under optimal conditions, the constructed immunosensor exhibited a wide linear range (1 fg/mL to 10 ng/mL) with a low limit of detection (0.14 fg/mL). Moreover, the immunosensor exhibited superior stability, good reproducibility, favorable selectivity, and high sensitivity. Meanwhile, the concentration of ProGRP in human serum samples was measured with satisfactory results. This device is promising in the early screening of lung cancer, which can be applied as an over-the-counter test at home or in the community.
研究领域:
电化学
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纳米技术
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生物传感器
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癌症诊断
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医疗器械
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Jiaodi Li,Linzi Huang,Minghui Huang,Yaqi Yang,Zhifang Liu,Chenxi Wang,Yixi Xie,Pengcheng Zhao,Junjie Fei
Copper (II) ion (Cu 2+ ) is a typical heavy metal ion that not only harms the soil and water environment, but also causes neurological disorders, liver cirrhosis and other diseases. Here, we have successfully synthesized three-dimensional CdS/rGO@Au heterojunction using a simple physical mixing technique, characterized the material synthesis by X-ray diffraction spectroscopy (XRD), Transmission electron microscopy (TEM), and finally used it for selective photoelectrochemical detection of Cu 2+ . In this system, the synergistic interaction of the three creates a channel that is ideal for charge carrier separation and transfer. The cauliflower-shaped CdS possesses a large surface area and acts as a Cu 2+ probe. rGO@Au acts as a sensitizer and amplifies the current change. The photocurrent of the CdS/rGO@Au heterojunction is 7 times higher than that of CdS, indicating that CdS/rGO@Au has a good photoresponse intensity. Under the optimized detection conditions, the proposed photoelectrochemical sensor was able to detect Cu 2+ concentration in the range of 5 nM to 4 μM with a very low limit of detection (LOD) of 2.88 nM. Moreover, the application feasibility of the developed CdS/rGO@Au heterojunction sensor was verified by the detection of Cu 2+ in real water samples.
研究领域:
环境科学
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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
Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 8
·1642-1649
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IF 7
Jing Liu,Ruke Wang,Fenfen Zhai,Wengan Zhang,Bo Wang,Hong Zhou
Synergistic therapy is considered to be an efficient method for cancer therapy and bacterial elimination with excellent efficacy and high controllability. A new graphene-based nanozyme family member, Hemin–rGO@Au NFs, was synthesized and demonstrated synergistic antibacterial capability. The composite benefits from a high peroxidase-like catalytic activity, excellent photothermal conversion efficiency in the NIR region and fast electron transfer capability. The synthetic procedure of the nanozyme composite is simple but it shows an impressive synergistic antibacterial effect. We expect that these findings will lead to new and wide applications of rGO–Au composites in the biological field.
研究领域:
纳米技术
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生物医学工程
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材料科学
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细菌学
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产品关联
DOI
高影响因子
FOOD CONTROL
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2025
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IF 6.3
Xishun Peng,Zhongchen Bai,Caizhen Zu,Yuxue He,Qi Zhao
The presence of thiram residues on fruit peels posed a significant risk to human health. Here, we prepared an electrochemical surface-enhanced Raman spectroscopy (EC-SERS) sensor of SPE/RGO/Au@Ag flexible film to detect thiram residues on fruit peel. The surface of this film was evenly covered with Au@Ag nanoparticles, which allowed it to specifically identify thiram residues through the formation of Ag-S bond. In addition, an electrochemical method was used to modulate the energy level matching between the SERS film and the thiram molecules to improve the chemical enhancement effect of the SERS. The results indicated that the charge transfer degree between the SERS film and the thiram molecules was up to 0.875. The SPE/RGO/Au@Ag film achieved a limit of detection (LOD) of 2.1 pM at -1.3 V. Owing to its excellent SERS performance, the SPE/RGO/Au@Ag film could successfully recognize the thiram residues on apple and orange peels, with recoveries of 91% to 107% and from 89% to 102%, respectively. The flexible EC-SERS sensor offers considerable promise for sensitively recognizing thiram residues on fruit peels.
研究领域:
分析化学
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食品安全
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传感器与生物传感器
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纳米材料
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Dongmiao Qin,Xiaohua Jiang,Guichun Mo,Jinsu Feng,Biyang Deng
A label-free electrochemiluminescence (ECL) immunosensor is developed to detect alpha-fetoprotein (AFP). Ru (bpy) 3 2+ -doped silica nanoparticles (Ru–SiO 2 ) and gold nanoparticle-modified reduced graphene oxide (rGO@Au) are integrated to form an rGO@Au@Ru–SiO 2 composite. The composite is employed as a carrier for immobilizing the target antibody, and a label-free ECL immunosensor is constructed via antigen–antibody interaction. Owing to the numerous Ru (bpy) 3 2+ molecules in the Ru–SiO 2 , a high ECL signal is acquired. With excellent conductivity and a large surface area, the rGO@Au composite not only accelerates electron transfer but also improved the ECL signal and captures antibodies, thus enhancing ECL response and sensitivity. Moreover, boron nitride quantum dots (BNQDs) are used as rGO@Au@Ru–SiO 2 coreactants, achieving high ECL intensity. The proposed ECL system exhibits significant potential in bioanalysis , which is attributed to the excellent biocompatibility and good stability of BNQDs. Under optimal experimental conditions, the sensor has a linear range of 0.0001 ng mL −1 to 100 ng mL −1 and a limit of detection equal to 0.03 pg mL −1 (S/N = 3). The proposed technique is successfully applied in the susceptible detection of AFP in human serum. The recovery ranges from 99% to 100%, and the RSD is less than 2.8%. The constructed ECL immunosensor exhibits acceptable performance during actual application.
研究领域:
生物分析
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医学诊断
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产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 27
·2703-2713
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IF 3.532
Min Wang,Mingzhe Jiang,Xiaochen Liao,Xiao Wang,Wenjing Lai,Pengli Li,Jiajia Li,Chenglin Hong,Yu Qi
The effective amplification of the signal is the prerequisite for the ultrasensitive detection of electrochemical immunosensors. To quantitatively detect alpha-fetoprotein (AFP), we prepared a sandwich-type electrochemical immunosensor. Using a gold nanoparticles (Au NPs) modified glassy carbon electrode (GCE) as the sensing platform and Cu/Cu2O-rGO@Au as the signal label, differential pulse voltammetry (DPV) was used to achieve sensitive detection of AFP. We found that the nanomaterials can undergo electro-oxidation and electro-reduction reactions between Cu(I) and Cu(II) in a buffer solution of pH = 6.0. It is worth mentioning that the incorporation of metals into metal oxide substrates is a new strategy to combine the catalytic activity of metal oxides with the electrical conductivity of metals. Reduced graphene oxide (rGO), which is rich in oxygen-containing groups, can load more Cu/Cu2O and Au NPs and increase the conductivity. The modification of Au NPs makes them have better biocompatibility and conductivity. Under the best detection conditions, the prepared immunosensor realizes the specific and ultrasensitive detection of AFP. The detection range is 0.01–50 ng mL−1 and the limit of detection (LOD) was as low as 0.589 pg mL−1 (S/N = 3); meanwhile it also has good practical application ability. Therefore, this immunosensor provides an important means for the early screening and detection of AFP.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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