Constructing heterostructure on highly roughened caterpillar-like gold nanotubes with cuprous oxide grains for ultrasensitive and stable nonenzymatic glucose sensor

Improving Surface Adsorption via Shape Control of Hematite α-Fe2O3 Nanoparticles for Sensitive Dopamine Sensors

“…At higher scanning rates, it can be seen that the separation in the redox peak position increased obviously, as shown in Figure d, which indicates that the charge-transfer kinetics partly limits the occurrence of redox reactions, leading to a increased separation in the redox peak position. Accordingly, by measuring the change of peak potential with scanning rate, the electron-transfer rate constant (ks) and charge-transfer coefficient (α) can be calculated using Laviron eqs , 3, and 4, respectively. ,,, where Δ E is the peak separation of the S-Fe 2 O 3 –GCE redox couple. According to the above equations, the value of n is calculated to be 0.9649, implying a one-electron and one-proton transformation process at the sensor interface .…”

Participation of Lattice Oxygen in Perovskite Oxide as a Highly Sensitive Sensor for p-Phenylenediamine Detection

“…Moreover, the surface and interfacial characterization of SCP/GCE and SC/GCE can also be confirmed in our work by electrochemical impedance spectroscopy (EIS), which was tested in 0.2 M NaOH solution over a frequency range of 0.1 Hz to 1 MHz. The semicircle portion at high frequency represents the charge transfer limited process [ 38 , 39 ], as shown in Figure 3 c, and the semicircle value of SPC/GCE is smaller than that of SC/GCE, suggesting the faster electron transfer rate of SPC/GCE.…”

Porous nitrogen-doped reduced graphene oxide-supported CuO@Cu2O hybrid electrodes for highly sensitive enzyme-free glucose biosensor

“…So their electrocataltyic activities are not satisfactory, and their sensing performances are also well below expectation. 14 To avoid the spontaneous agglomeration and improve the electronic conductivity, anchoring of copper oxide NPs on a conductive support is an effective strategy, thus promoting their biosensing performance as an electrochemical sensor. Carbon nanomaterials (CNMs) (i.e., graphene, carbon nanofibers, carbon nanotubes) are outstanding substrate materials for anchoring metal oxide NPs, because they have high surface area, good chemical stability, and excellent electronic conductivity.…”