Synthesis of carbon nanosheet from barley and its use as non-enzymatic glucose biosensor

Abstract

In this work, carbon nanosheet (CNS) based electrode was designed for electrochemical biosensing of glucose. CNS has been obtained by the pyrolysis of barley at 600–750 °C in a muffle furnace; it was then purified and functionalized. The CNS has been characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopic techniques. The electrochemical activity of CNS-based electrode was investigated by linear sweep voltammetry (LSV) and square wave voltammetry (SWV), for the oxidation of glucose in 0.001 M H2SO4 (pH 6.0). The linear range of the sensor was found to be 10−4–10−6 M (1–100 µM) within the response time of 4 s. Interestingly, its sensitivity reached as high as ~26.002±0.01 μA/μM cm2. Electrochemical experiments revealed that the proposed electrode offered an excellent electrochemical activity towards the oxidation of glucose and could be applied for the construction of non-enzymatic glucose biosensors.

Synthesis and characterization of V2O5/urease for a biosensor of urea

“…Then, the slope was 1.32 μA⋅(mmol⋅L −1 ) −1 and the sensitivity of the V 2 O 5 /urease sensor was calculated as being 1.38 μA⋅(mmol⋅L −1 ⋅cm −2 ) −1 . The sensitivity of V 2 O 5 /urease electrode is considered low when compared with the literature [22–25].…”

“…Currently, several materials such as, vanadium pentoxide (V 2 O 5 ) [4, 12, 13], tungsten trioxide (WO 3 ) [14–16], zinc oxide (ZnO) [17], and titanium dioxide (TiO 2 ) [18, 19] have beenproposed in the literature as material for biosensor, which may reduce costs, increase sensitivity, and possess conductive properties. V 2 O 5 is one of the oxides that has been shown to be quite promising due to its remarkable characteristics such as thermal and chemical stability, biocompatibility, and conductivity, which allows its application in multiple and different areas [22,23]. One of the best way to obtain V 2 O 5 films is via sol–gel.…”

Efficient Polysulfides Conversion Kinetics Enabled by Ni@CNF Interlayer for Lithium Sulfur Batteries

“…1b). The extent of the ratio shifting between the bands implied possible structure defects and shifts in the grain boundaries that could affect the agglomeration of nanoparticles [29,30]. Nitrogen porosimetry was employed to investigate the materials' pore characteristics and, according to the BJH method, demonstrated that the average diameter of pores was approximately ~ 3.817 nm for both Ni@CNF and CNF (Fig.…”

Enhancing a Novel Robust Multicomposite Materials Platform for Glucose Biosensors

“…In order to reduce and prevent the negative effects, the diabetic patient must control their blood glucose level and maintain a daily monitor of blood glucose as well [21]. Additionally, an intimate blood glucose measurement is necessary for clinical diagnosis and treatment of diabetes mellitus [22] which makes glucose the most frequently tested, clinically-relevant analyte [23]. Thus, the continuous development of simple, accessible and effective devices to determine the glucose concentration for ordinary people is very important to contribute to fast preliminary selfdiagnosis and early treatment.…”