The weak conductivity and sluggish electrochemical reaction kinetics lead to low sensitivity and slow response speed of CuO-based non-enzymatic glucose sensors (NEGSs). Therefore, developing CuO-based NEGSs with high sensitivity, excellent selectivity, and fast response is vital for monitoring and analyzing the glucose concentration of humans and beverages. In this work, the MOF-derived porous CuO nanosheets were synthesized by the bottom-up and annealing methods, and CuO/CNT(7:3) NEGSs were prepared. The CuO/CNT(7:3) NEGSs exhibit good glucose sensing performance, including a high sensitivity of 4.34 mA mM−1 cm−2 (about 3 times higher than that of CuO NEGSs) in a linear range of 0.5 µM-1 mM, ultra-fast response time of 0.45 s (superior to most reports on NEGSs), and favorable selectivity. The superior glucose sensing properties of CuO/CNT(7:3) NEGSs are due to the synergistic effect of MOF-derived CuO and CNT. MOF-derived CuO nanosheets with porous structures provide more active sites resulting in good sensing properties, meanwhile, CNT improves the conductivity of composites, enhances the ion diffusion in the electrode, and accelerates the electron transfer at the electrode/electrolyte interface, leading to higher sensitivity and faster response speed. Moreover, the CuO/CNT(7:3) NEGSs also show a good recovery for glucose detection in human urine and beverages. This work suggests that the CuO/CNT(7:3) composites are a prospective electrode material for high-performance NEGSs. 

MOF-derived CuO/CNT for high sensitivity and fast response glucose sensing

Recent trends in hierarchical electrode materials in supercapacitor: Synthesis, electrochemical measurements, performance and their charge-storage mechanism

Recent Advances in Pseudocapacitive Electrode Materials for High Energy Density Aqueous Supercapacitors: Combining Transition Metal Oxides with Carbon Nanomaterials

Heavy metal ions exhibit significant toxicity and pose threats to ecosystems and human health. Therefore, the development of sensitive detection methods is crucial. Nanozyme-based heavy metal sensors have garnered attention, yet existing nanozymes often suffer from low catalytic activity, limited functionality, and unclear mechanisms. To address these issues, this study successfully synthesized an organic-inorganic hybrid nanozyme (NH2-MIL-101(Fe)@Cu/CeO2) using doping and composite techniques, creating a dual-functional sensor. It's worth noting that in NH2-MIL-101(Fe)@Cu/CeO2, copper doping and heterojunction formation may increase oxygen vacancy concentration, promoting electron transfer. Compared to individual components like amino-terephthalic acid iron (III) metal-organic framework (NH2-MIL-101(Fe)) and copper-doped cerium dioxide (Cu/CeO2), this composite material exhibited enhanced peroxidase-like activity (oxidase-like, peroxidase-mimic, catalase-mimic, and superoxide dismutase-mimic). Particularly, NH2-MIL-101(Fe)@Cu/CeO2 displayed outstanding peroxidase-like activity, with Km values of 0.02 mM for TMB and 0.49 mM for H2O2, surpassing most nanozymes, along with high reaction rate (Vmax = 3.82 × 10−5 mM/s). Leveraging NH2-MIL-101(Fe)@Cu/CeO2's peroxidase-like behavior, TMB oxidation turned blue, inhibited by glutathione causing fading. Importantly, Hg2+ complexed with glutathione's thiol group forming GSH-Hg2+, restoring the blue color. Utilizing these properties, a colorimetric sensor for Hg2+ detection was developed. Furthermore, NH2-MIL-101(Fe)@Cu/CeO2 also exhibited remarkable fluorescence performance; Cu2+ binding with amino groups quenched fluorescence. Exploiting this phenomenon, a fluorescent sensor for Cu2+ detection was devised. Results demonstrated this dual-functional sensor's advantages: high sensitivity (LODHg2+ = 0.7 nM, LODCu2+ = 0.1 µM), strong selectivity, wide linear range (0.01 ∼ 4 µM and 8 ∼ 600 µM), and robust stability (90 % activity retained after three cycles). 

Dual-function sensor based on NH2-MIL-101(Fe)@Cu/CeO2 nanozyme for colorimetric and fluorescence detection of heavy metals

Redox kinetics promoted by flower-like La2CoMnO6 @NiCo2O4 heterojunctions for high-performance supercapacitors

Construction of NiCo2O4@CNPs core-shell nanocomposites with 2D leaf-like structure for high-performance supercapacitor

Uniformly embedded PtCu alloy nanoparticles on mesoporous carbon nanospheres: a high-efficiency nanozyme for glucose detection

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Construction of NiCo2O4@CNPs core-shell nanocomposites with 2D leaf-like structure for high-performance supercapacitor

Uniformly embedded PtCu alloy nanoparticles on mesoporous carbon nanospheres: a high-efficiency nanozyme for glucose detection