“…The fabricated glucose sensor showed high sensitivity 3059 μA mM −1 cm −2 , low detection limit 0.22 μM, and wide linear dynamic range 0.001–20 mM. The excellent electrocatalytic behavior was attributed to the synergism due to bimetallic oxide, the significant role of Ppy in transmitting charges among electrode material due to its excellent conductivity, non-collapsing and non-agglomeration of the NiCo 2 O 4 due to Ppy coating, and absence of any adhesive or conductive agent during electrode fabrication [ 264 ]. Fig.…”
Section: Biosensor Applications Of Nano-/micro-structured Nico
2
Omentioning
Non-enzymatic biosensors based on mixed transition metal oxides are deemed as the most promising devices due to their high sensitivity, selectivity, wide concentration range, low detection limits, and excellent recyclability. Spinel NiCo2O4 mixed oxides have drawn considerable attention recently due to their outstanding advantages including large specific surface area, high permeability, short electron, and ion diffusion pathways. Because of the rapid development of non-enzyme biosensors, the current state of methods for synthesis of pure and composite/hybrid NiCo2O4 materials and their subsequent electrochemical biosensing applications are systematically and comprehensively reviewed herein. Comparative analysis reveals better electrochemical sensing of bioanalytes by one-dimensional and two-dimensional NiCo2O4 nano-/microstructures than other morphologies. Better biosensing efficiency of NiCo2O4 as compared to corresponding individual metal oxides, viz. NiO and Co3O4, is attributed to the close intrinsic-state redox couples of Ni3+/Ni2+ (0.58 V/0.49 V) and Co3+/Co2+ (0.53 V/0.51 V). Biosensing performance of NiCo2O4 is also significantly improved by making the composites of NiCo2O4 with conducting carbonaceous materials like graphene, reduced graphene oxide, carbon nanotubes (single and multi-walled), carbon nanofibers; conducting polymers like polypyrrole (PPy), polyaniline (PANI); metal oxides NiO, Co3O4, SnO2, MnO2; and metals like Au, Pd, etc. Various factors affecting the morphologies and biosensing parameters of the nano-/micro-structured NiCo2O4 are also highlighted. Finally, some drawbacks and future perspectives related to this promising field are outlined.
“…The fabricated glucose sensor showed high sensitivity 3059 μA mM −1 cm −2 , low detection limit 0.22 μM, and wide linear dynamic range 0.001–20 mM. The excellent electrocatalytic behavior was attributed to the synergism due to bimetallic oxide, the significant role of Ppy in transmitting charges among electrode material due to its excellent conductivity, non-collapsing and non-agglomeration of the NiCo 2 O 4 due to Ppy coating, and absence of any adhesive or conductive agent during electrode fabrication [ 264 ]. Fig.…”
Section: Biosensor Applications Of Nano-/micro-structured Nico
2
Omentioning
Non-enzymatic biosensors based on mixed transition metal oxides are deemed as the most promising devices due to their high sensitivity, selectivity, wide concentration range, low detection limits, and excellent recyclability. Spinel NiCo2O4 mixed oxides have drawn considerable attention recently due to their outstanding advantages including large specific surface area, high permeability, short electron, and ion diffusion pathways. Because of the rapid development of non-enzyme biosensors, the current state of methods for synthesis of pure and composite/hybrid NiCo2O4 materials and their subsequent electrochemical biosensing applications are systematically and comprehensively reviewed herein. Comparative analysis reveals better electrochemical sensing of bioanalytes by one-dimensional and two-dimensional NiCo2O4 nano-/microstructures than other morphologies. Better biosensing efficiency of NiCo2O4 as compared to corresponding individual metal oxides, viz. NiO and Co3O4, is attributed to the close intrinsic-state redox couples of Ni3+/Ni2+ (0.58 V/0.49 V) and Co3+/Co2+ (0.53 V/0.51 V). Biosensing performance of NiCo2O4 is also significantly improved by making the composites of NiCo2O4 with conducting carbonaceous materials like graphene, reduced graphene oxide, carbon nanotubes (single and multi-walled), carbon nanofibers; conducting polymers like polypyrrole (PPy), polyaniline (PANI); metal oxides NiO, Co3O4, SnO2, MnO2; and metals like Au, Pd, etc. Various factors affecting the morphologies and biosensing parameters of the nano-/micro-structured NiCo2O4 are also highlighted. Finally, some drawbacks and future perspectives related to this promising field are outlined.
“…Overall, non-enzymatic glucose sensors have many strong advantages, such as a high reproducibility, a high stability, and structural simplicity. To date, many noble metals (Pt, Au, and Pd), transition metals (Cu, Ni, and Co) and their oxides or hydroxides have been used in non-enzymatic glucose sensors [9][10][11][12][13][14][15]. Among them, Au is widely used because it produces a high glucose oxidation current in neutral or alkaline conditions [16,17].…”
A composite with gold nanoparticles (AuNPs) decorating single-walled carbon nano-horns (SWCNHs) is synthesized and used to modify a gold electrode for non-enzymatic glucose detection. The composite was synthesized by a simple covalent bonding method. The AuNPs with an average particle size of 40 nm are dispersed homogeneously on the surface of the SWCNHs. Therefore, the synergistic effect of the AuNPs and the SWCNHs leads to an excellent glucose sensing performance. The glucose sensing tests indicate that the electrode fabricated has a linear response in the 0.5-2 mM and 4-12 mM glucose concentration range, a high sensitivity (275.33 and 352.5 µA cm − 2 mM − 1 ), and a low detection limit (0.72 µM) (S/N = 3) at + 0.3 V, as well as strong resistance to the interference by ascorbic acid (AA), uric acid (UA), dopamine (DA), galactose, and lactose. When the electrode was used for the detection of glucose in blood samples, the glucose contents detected by the electrode was in right agreement with real. The performance level reached makes the electrode a potential alternative tool for the detection of glucose.
“…Compared with single metal-based electrodes, bimetallic compounds often show higher sensitivity. 37,38 For example, G. Gnana Kumar et al synthesized CuO/NiO-carbon nanocomposite materials by the pyrolysis of Cu-Ni MOFs. 39 Compared to the pure Cu-carbon based or Ni-carbon based materials, CuO/NiO-carbon nanocomposite materials had a considerable current response for 5 mM glucose (around 1.5 times higher than CuO/C and 1.2 times higher than NiO/C nanocomposite materials) with a sensitivity of 587 mA mM À1 cm À2 .…”
Section: Introductionmentioning
confidence: 99%
“…However, MOFs that have uniformly distributed metals ion of nodal positions often suffer from the fragile frameworks due to the introduction of second metal nodes. [40][41][42][43][44][45] To the best of our knowledge, even though mixed Co-Ni metal oxides are considered as one of the most active materials for glucose sensors, 37,38 preparation of the mixed Co-Ni metal oxides for glucose sensors via pyrolysis of bimetallic MOFs has been rarely reported.…”
Non-enzymatic glucose sensors based on different Co–Ni–C composite materials were developed by pyrolysis of bimetallic or single metal based metal–organic frameworks (MOFs).
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