d-Glucose sensor based on ZnO·V₂O₅ NRs by an enzyme-free electrochemical approach

Abstract

A simple wet-chemical technique was used to prepare zinc oxide-doped vanadium pentaoxide nanorods (ZnO·V2O5 NRs) in an alkaline environment.

Potentiometric Performance of a Highly Flexible-Shaped Trifunctional Sensor Based on ZnO/V2O5 Microrods

“…Glucose is converted to gluconolactone and finally to gluconic acid with the release of H 2 O 2 . The H 2 O 2 decomposes into an oxygen molecule and protons by generating electrons which are responsible for the current-potential characteristic for glucose sensing [ 33 ]. The glucose-sensing phenomenon is well elaborated in the following reactions: …”

“…Interestingly, two cathodic peaks were observed with one considerably below −100 mV and the other slightly above 600 mV. However, a calibrated potential higher than the latter was selected to construct the calibration curve because detection of enzymatic reaction (oxidation of H 2 O 2 ) takes place at 600 mV at Pt electrode [ 33 ].…”

“…Though Rahman et al reported on a d-glucose sensor based on ZnO/V 2 O 5 which showed sensitivity of 1.27 × 10 −3 μAμM −1 cm −2 with 125.25 mM limit of detection. This active material has the potential to be applied to multiple sensor applications [ 33 ]. Based on our knowledge, there is no report on ZnO/V 2 O 5 based multifunctional sensors on a flexible substrate for temperature, glucose and pH combined detections.…”

An enzyme free simultaneous detection of γ-amino-butyric acid and testosterone based on copper oxide nanoparticles

“…The LOQ was found for GABA (39.0 pM) and TST (322.2 pM) from calibration curves based on eqn (x)-(xii). [19][20][21][22][23] Where, m ¼ slope of the calibration bend (1 Â 10 À5 and 9 Â 10 À5 ), A ¼ dynamic surface area of GCE (diameter ¼ 0.0316 cm 2 ), SD ¼ standard deviation (0.39 and 0.29) of GABA and TST concentration, calibrated at +0.6 V (Fig. 5b-d).…”

The synthesis and application of (E)-N′-(benzo[d]dioxol-5-ylmethylene)-4-methyl-benzenesulfonohydrazide for the detection of carcinogenic lead

“…A xed quantity ($25.0 mL) of each natural sample was examined in phosphate buffer (10.0 mL, pH ¼ 7.5, and 100.0 mM) using the modied BDMMBSH/GCE/NF sensor. [43][44][45][46][47][48][49] The concentrations were calculated at the calibrated potential (+0.7 V) for the detection of Pb 2+ in coal water, industrial effluent, Red Sea water, rice water, tap water, and well water, which absolutely demonstrated that the I-V method is proper, reliable, and appropriate for the analysis of real samples. Fig.…”