Enhanced electrochemical glucose sensing performance of CuO:NiO mixed oxides thin film by plasma assisted nitrogen doping

Abstract

In this study plasma-assisted nitrogen doping of a CuOeNiO mixed oxide thin film was presented. The as prepared film was also applied as a glucose sensor. The nitrogen species generated during plasma ignition resulted in a beneficial phase transformation of CuO to Cu 2 O. Characterisation techniques such as XRD, SEM, EIS and Hall Effect etc. measurements were utilized to study the morphology, structural features, doping profile and electrical properties of the sensing material. Device performance electrochemical testing showed that the as-developed sensor (labelled as NeCuO/Cu 2 O:NiO) showed an ultrafast response time of 2.5 s with high sensitivity (1131 mA/mM.cm 2 ). The linear range of the sensor was calculated to be up to 2.74 mM of glucose and excellent selectivity towards glucose at an applied potential of þ0.67 V vs Ag/AgCl in 0.1 M NaOH electrolyte solution. The limit of detection was calculated to be 20 mM for the NeCuO/Cu 2 O:NiO sensor. The NeCuO/Cu 2 O:NiO have smaller Tafel slope compared to pristine CuO and CuO:NiO mixed oxides. Enhanced electrochemical performance of the NeCuO/Cu 2 O:-NiO originates from the improved electronic properties of the thin film.

Stability of FeF3-Based Sodium-Ion Batteries in Nonflammable Ionic Liquid Electrolytes at Room and Elevated Temperatures

“…Considering that our FeF 3 is in the nanoparticle size range and the original semi-infinite Warburg (W) diffusion describes the diffusion at the macroscales, W cannot represent the ionic diffusion phenomenon within individual particles . Therefore, a bounded diffusion impedance model is utilized in the equivalent circuit (M3, Figure c) which describes the ionic diffusion in conversion-type solids/cathodes based on the electrode geometry. , In this model, M1 and M2 represent the equivalent circuits for the interfacial resistance from the cathode and anode, respectively. W 2 models the ionic diffusion in the electrolyte and R int represents the internal electrical resistance of the whole cell.…”

Mingled MnO2 and Co3O4 Binary Nanostructures on Well-Aligned Electrospun Carbon Nanofibers for Nonenzymatic Glucose Oxidation and Sensing

“…In addition, the Tafel slope of the three electrodes followed a trend as Co 3 O 4 @ECNFs > MnO 2 @ECNFs > MnO 2 /Co 3 O 4 @ECNFs, shown in Figure 4c. The lowest Tafel slope of the hybrid composite electrode indicates the highest charge transferability of the materials, 72 suggesting the synergistic effect of mingled metal oxides at ECNFs. These results indicate a better electrooxidative performance of MnO 2 /Co 3 O 4 @ECNFs than the monometallic oxide electrodes.…”

Electrospun porous La–Sr–Co–Ni–O nanofibers for highly sensitive non-enzymatic glucose detection

“…Nanostructured metal oxides are considered as the most promising low-cost alternatives to the enzymatic and noble metal sensors for the selective detection of biomarkers. Several transition metal oxides are identified as suitable candidates for glucose [3][4][5][6][7] and dopamine [8][9][10] . The characteristics of the electrode surface are the primary factor that controls the electrochemical sensing of the above analytes.…”