JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Dongxiao Lu,Jinhua Li,Zhe Wu,Lin Yuan,Wenhui Fang,Peng Zou,Li Ma,Xiaojun Wang
Colorimetric biosensors, based on enzyme-like nanomaterials, have come into the spotlight in virtue of their visual detection. Herein, a daisy-like zeolitic imidazolate framework-67/reduced grapheme oxide (ZIF-67/rGO) nanozyme with unique 3D hierarchical structures has been designed to realize visual detection of hydrogen peroxide (H 2 O 2 ) that is recognized as a strong oxidizing agent or reactive oxygen species associated with oxidative stress in biological systems. The daisy-like ZIF-67/rGO is prepared by a facile one-step liquid-phase method conducted under room temperature. The successful introduction of rGO endows the daisy-like ZIF-67/rGO nanozyme with abundant porous structure, high specific surface area, and good charge transfer capability, which significantly accelerates the adsorbability and recognition towards the substrates and the oxidation rate of TMB-H 2 O 2 reaction, and thus improving the nanozyme activity observably. It is conductive to nanozyme-modulated H 2 O 2 determination. The established colorimetric biosensor platform based on ZIF-67/rGO nanozyme exhibits remarkable sensitivity and high specificity for the application in visual detection of H 2 O 2 . The detection limit of ZIF-67/rGO-based biosensor platform is as low as 3.81 μM, which is nearly 8 times lower than that of ZIF-67-based biosensor platform. Moreover, its potential applicability as an ideal platform for colorimetric biosensors is demonstrated by testing the concentration of H 2 O 2 in milk samples, which sheds light on the promising application of the proposed biosensing system in point-of-care detection.
研究领域:
生物化学
·
纳米生物学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Liang Yin,Xiangqun Chu,Huimin Chen,Bin Liu,Pinhua Zhang,Lulu Du,Guangliang Cui,Li Lv
Nitrogen dioxide (NO 2 ) is a major atmospheric pollutant that poses a significant threat to human health, the development of efficient and accurate NO 2 gas sensors is crucial for air quality monitoring. Metal-organic frameworks (MOFs) are considered ideal materials for gas sensing due to their exceptional tunability, large surface area, high porosity, and abundant active metal sites. However, the poor conductivity of MOFs limits their applications in electrochemical sensors. This study presents a ZIF-67/rGO nanocomposite synthesized by combining reduced graphene oxide (rGO) with ZIF-67 via a one-step solution method. Experimental results demonstrate that the ZIF-67/rGO nanocomposite sensor shows significant sensitivity to NO 2 gas at room temperature. At 5 ppm NO 2 , the response is approximately 13-fold higher than that of the pure rGO sensor. More importantly, the sensor achieves a detection limit as low as 0.5 ppm, with an ultra-fast response time of 15 s and recovery time of 40 s at room temperature. Additionally, the sensor exhibits excellent repeatability, long-term stability, and high selectivity for NO 2 . This study presents an effective strategy for accurate real-time detection of low concentration NO 2 gas and provides valuable insights for designing MOF-based hybrid sensors at room temperature.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2023
·
IF 4
Lu Danli,He Zhiping,Liu Weiliang
In this work, a novel NiCo/ZIF-67/rGO catalyst was prepared via a facile impregnation-reduction method, followed by comprehensive characterization using XRD, SEM, TEM, XPS, and ICP-OES techniques. This catalyst featured a hierarchical porous support consisting of Zeolitic Imidazolate Framework-67 (ZIF-67) with a high specific surface area and reduced graphene oxide (rGO) with considerable electronic conductivity, along with strong synergistic interactions between Ni and Co species as well as between the deposited metals and the carbon in rGO. The NiCo/ZIF-67/rGO catalyst exhibited excellent activity in catalyzing the hydrolysis of NaBH 4 , resulting in a low activation energy ( E a ) of 21.08 kJ mol −1 and a high turnover frequency (TOF) value of 5420 \(mL_{{\textit{H}}_\text{2}}g_\textit{M}^{-1}\min^{-1}\) . The hydrogen generation rate was increased by nearly double after five cyclic experiments, demonstrating the exceptional catalytic durability of NiCo/ZIF-67/rGO. The as-prepared NiCo/ZIF-67/rGO catalyst exhibits the advantages of cost-effectiveness, durability, and superior performance for NaBH 4 hydrolysis, rendering it a promising candidate for industrial applications.
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产品关联
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 47
·5777-5786
·
IF 2.896
Jinyang Chen,Jiamei Wang,Ruihong Ye,Dihui Huang,Sheng Chen
The low conductivity of metal–organic frameworks seriously impedes their electrocatalytic performance. In this study, we prepared a fabricated sandwich structure composed of a Co-based zeolitic imidazolate framework (ZIF-67) and reduced graphene oxide (rGO) through a facile and simple one-pot hydrothermal reaction. This framework of nanocomposites, which are modified with a glassy carbon electrode, constructed a bisphenol A (BPA) electrochemical sensor for the first time. Operational parameters such as pH, electrolytes, the amount of modifiers, deposition potentials and deposition time were optimised for the sensitive detection of BPA. The performance of electrodes was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction and transmission electron microscopy. With differential pulse voltammetry, the detection concentration of BPA ranged from 0.05 μmol L−1 to 100 μmol L−1. The results revealed that the hierarchical nanocomposites demonstrated better electrocatalytic performance with large electrochemically active surface areas, high sensitivity and a low limit of detection (5.2 nmol L−1), compared with a physical mixture of ZIF-67 and rGO at the same ratio. These impressive features originate from the synergistic effects of ZIF-67 and rGO. This study presents a new strategy using metal–organic framework composite materials for the sensitive detection of BPA.
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产品关联
DOI
PubMed
高影响因子
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