Search

Metal organic frameworks derived hybrid microspheres consisted of Ni3N and nitrogen-doped carbon were prepared by a facile in situ nitridation process. The as prepared Ni3N@C electrocatalysts displayed superior performance for non-enzymatic glucose sensing with two linear detection ranges. The sensitivity in the lower detection range (0.001–3 mM) is 1511.59 μ AmM−1 cm−2 with detection limit of 0.3 μM. The sensitivity in higher detection range (3–7 mM) is calculated to be 783.75 μ A mM−1 cm−2. The excellent electrochemical performance of Ni3N@C for glucose sensing was mainly attributed to its fast charge transfer ability stemming from the synergistic effect of nitrogen-doped carbon and uniform dispersed Ni3N nanoparticles. Furthermore, the as constructed Ni3N@C sensor also showed good feasibility for glucose detection in serum sample and acceptable recovery in analysis. Thus, the preparation of Ni3N@C may hold a new promise for designing highly sensitive non-enzymatic glucose sensors. [ABSTRACT FROM AUTHOR]

Au nanoparticles were decorated on Ni-based metal–organic frameworks to improve their electrochemical performance for nonenzymatic glucose detection through a convenient and fast microwave-assisted process. Various techniques including scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive X-ray mapping and X-ray photoelectron spectroscopy were used to characterize the Au@Ni-BTC composites. The results revealed that Au nanoparticles were uniformly deposited on the Ni-BTC microspheres. The constructed Au@Ni-BTC sensors showed highly increased glucose detection performance with a wide linear range (5–7400 μM), high sensitivity (1447.1 μA mM−1 cm−2) and low detection limit (1.5 μM). Moreover, they also exhibited good selectivity and preferable feasibility for serum sample analysis. The improved glucose sensing performance may be due to the synergistic effects of Au nanoparticles and Ni-BTC, which facilitated faster charge transfer in the electrochemical process. The study of Au@Ni-BTC may also provide a promising material for constructing highly efficient nonenzymatic glucose sensors. [ABSTRACT FROM AUTHOR]

Polyhedral NiO/carbon porous composites with highly dispersed NiO nanoparticles were successfully obtained by controlled pyrolyzing Ni-MOF precursors. The effect of the pyrolysis temperature on morphology, crystal structure and glucose-sensing performance of the composite materials was investigated in detail. The kinetic analysis demonstrated high electrocatalytic activity (Kcat, 2.09 × 106 M−1 s−1) for glucose oxidation on the obtained electrode materials. The constructed Ni-MOF400 sensors displayed ultra-high sensitivity (2918.2 μA mM−1 cm−2) for non-enzymatic glucose sensing with a relatively wide detection linear range (5 μM–4.1 mM) and low detection limit (0.92 μM). The high glucose sensing performance may be due to the greatly reduced charge transfer resistance (0.412 kΩ for Ni-MOF400 vs 19.27 kΩ for Ni-MOF800) originating from the synergistic effect of highly dispersed NiO nanoparticles and porous carbons. Moreover, the sensors also presented good selectivity in the presence of various interferents (l-lysine, urea, l-leucine, ascorbic acid, l-valine, NaCl, l-glutamic, and l-proline). The reasonable analytical recovery ranging from 103 to 108.1% for the glucose detection in bovine serum was also obtained, suggesting the preferable feasibility of the Ni-MOF400 sensors for the real sample analysis. [ABSTRACT FROM AUTHOR]

Nickel nitride decorated nitrogen doped carbon spheres (Ni 3 N/NCS) were synthesized via an eco-friendly one pot nitridation process. The morphology and structure, chemical composition, and electrochemical properties of Ni 3 N/NCS were characterized vie different methods. The Ni 3 N nanoparticles with average diameter of 20 nm were uniformly decorated on the surface of nitrogen doped carbon spheres. The constructed Ni 3 N/NCS sensor exhibited excellent performance for non-enzymatic glucose sensing, which included two wide linear ranges of 1 μM–3000 μM and 3000 μM - 7000 μM with high sensitivity of 2024.18 μAmM−1cm−2 and 1256.98 μAmM−1cm−2. The corresponding detection limits in lower and higher concentration ranges were 0.1 μM and 0.35 μM respectively. The significantly improved electrochemical performance of Ni 3 N/NCS may be due to the rapid charge transfer and high conductivity of Ni 3 N/NCS/GCE, originating from the synergistic effect of Ni 3 N and nitrogen doped carbon spheres. Moreover, the Ni 3 N/NCS sensor also displayed satisfactory recovery results for glucose detection in serum samples. The kinetics of glucose oxidation on the Ni 3 N/NCS electrode were also studied to understand the electrochemical reaction on the surface of the materials. Moreover, the possible mechanisms about the glucose sensing and the formation of Ni 3 N/NCS were also discussed. The present study may provide a rational strategy to eco-friendly prepare highly efficient electrocatalysts for non-enzymatic glucose sensing applications. • The Ni 3 N/NCS was prepared via a facile eco-friendly one pot nitridation process. • Highly improved non-enzymatic glucose sensing performance was obtained on Ni 3 N/NCS. • Enhanced electrochemical activity may be due to the synergistic effect of Ni 3 N and NCS. • The combination of Ni 3 N with NCS accelerated the charge transfer in the electrocatalyst. • The study may provide a rational strategy to design highly efficient sensing materials. [ABSTRACT FROM AUTHOR]

The carbon nanotubes entangled Ni/NiO porous polyhedrons were obtained by in situ growing process with Ni-MOF precursor acting as both the carbon source and catalyst (Ni/NiO) source, which showed highly improved electrochemical performance. The enhanced glucose oxidation activity of Ni/NiO/CNTs may be due to the synergistic effect of metallic nickel and carbon nanotubes. [ABSTRACT FROM AUTHOR]

• The bimetallic NiAu alloy dendrites were electrodeposited with a template free method. • The deposited NiAu on carbon papers can be used as disposable glucose sensors. • The as prepared NiAu alloy dendrites showed superior glucose sensing performance. • Enhanced performance may be due to dendrite structures and synergistic effects of Ni and Au. The bimetallic NiAu alloy dendrites were directly grown on the carbon papers using template free electrodeposition approaches, which demonstrated superior non-enzymatic glucose sensing performance. The enhanced electrochemical performance may be due to the dendrite structure and the low charge transfer resistance originating from the synergistic effect of Ni and Au. [ABSTRACT FROM AUTHOR]

Abstract The Ni 3 (PO 4) 2 /CSs composite microspheres were synthesized via a simple two step hydrothermal process. The composition and morphology of the microspheres were characterized by SEM, TEM, EDS, XRD and XPS. The Ni 3 (PO 4) 2 nanoparticles with diameter less than 10 nm have been uniformly decorated on the carbon spheres. The formation mechanism of the Ni 3 (PO 4) 2 /CSs and their corresponding glucose sensing process have also been proposed. The as prepared Ni 3 (PO 4) 2 /CSs showed greatly enhanced performance for glucose sensing than that of Ni 3 (PO 4) 2 , which may be due to the synergistic effect of Ni 3 (PO 4) 2 nanoparticles and carbon spheres resulting in a high efficiency of charge transfer. The Ni 3 (PO 4) 2 /CSs modified electrodes exhibited excellent glucose sensing performance, with wide linear range of (5 μM–2.5 mM) and (2.5 mM–7.5 mM), and corresponding sensitivity of 480.153 μAmM−1cm−2 and 219.898 μAmM−1cm−2. The detection limit of the Ni 3 (PO 4) 2 /Cs/GCE is found to be 1.67 μM (S/N = 3). Moreover, satisfactory results were also obtained using the as prepared sensor to analyze glucose concentration in serum samples. These results showed that Ni 3 (PO 4) 2 /CSs can be a favorable electrochemical sensing material for constructing the non-enzymatic sensors. Highlights • Ni 3 (PO 4) 2 nanoparticles were uniformly decorated on the carbon sphere surface. • Ni 3 (PO 4) 2 /CSs composite microsphere showed highly improved glucose sensing performance. • The sensors also displayed satisfactory results in real serum samples analysis. • High charge transfer efficiency was obtained by combination of Ni 3 (PO 4) 2 and carbon spheres. • Enhanced performance is due to the synergistic effect of Ni 3 (PO 4) 2 and carbon spheres. [ABSTRACT FROM AUTHOR]

The ammonium nickel phosphate (NH 4 NiPO 4 ·H 2 O) nanorods were achieved via a facile hydrothermal method with urea acting as both NH 4 + source and molecule template. The obtained samples were characterized by XRD, SEM, TEM, and XPS, which showed typically anisotropic growth of the crystals with rod-like structures. The diameter of the NH 4 NiPO 4 ·H 2 O nanorods is less than 50 nm. The excellent glucose sensing performance was further obtained on the NH 4 NiPO 4 ·H 2 O nanorods modified electrode, which have two corresponding linear regions of 5 μM–2100 μM and 2400 μM–5700 μM with the sensitivity of 459.4 μAmM−1 cm−2 and detection limit of 0.5 μM (S/N = 3) in the lower concentration range and the sensitivity of 250.2 μAmM−1 cm−2 and detection limit of 6 μM (S/N = 3) in the higher concentration range. Moreover, the as prepared sensor was also applied to analyze glucose concentration in serum samples, showing high possibility for real sample analysis. The highly nonenzymatic glucose sensing performance of NH 4 NiPO 4 ·H 2 O nanorods may be due to its intrinsic layered crystal structure and rod-like morphology. The formation process of the NH 4 NiPO 4 ·H 2 O nanorods and the corresponding glucose sensing mechanism were also discussed based on the analysis. These results could suggest that NH 4 NiPO 4 ·H 2 O nanorods may be favorable electrochemical sensing materials for constructing non-enzymatic sensors. • NH 4 NiPO 4 ·H 2 O nanorods were achieved via a facile urea assistant hydrothermal method. • Urea acted as both molecule template and NH4+ source in this easy process. • NH 4 NiPO 4 ·H 2 O nanorods showed much higher electrocatalytic activity on glucose sensing. • Highly glucose sensing performance is mainly due to its intrinsic layered crystal structure. • The results provide newly sensing application of ammonium transition metal phosphates. [ABSTRACT FROM AUTHOR]