Oxygen vacancies boosted vanadium doped ZnO nanostructures-based voltage-switchable binary biosensor

Abstract

The development of a reliable non-enzymatic multi-analyte biosensor is remained a great challenge for biomedical and industrial applications. In this prospective, rationally designed electrode materials having voltage switchable electrocatalytic properties are highly promising. Here, we report vanadium doped ZnO engineered nanostructures (Zn 1−x V x O where 0x0.1) which exhibit voltage switchable electrocatalytic properties for accurate measurements of glucose and hydrogen peroxide. Microstructures and chemical analysis show that the oxygen vacancies in the material can be tuned by controlling the stoichiometric ratios which play key role for voltage dependent measurements of different analytes. The developed Zn 1−x V x O nanostructures exhibit outstanding sensing ability for binary analytes with a high selectivity, low detection limit, thermal stability and long-term stability. The Zn 0.9 V 0.1 O/glassy carbon (GC) electrode shows 3-fold increase in reproducible sensitivity for both glucose (655.24 μA mM −1 cm −2 ) and H 2 O 2 (13309.37 μA mM −1 cm −2 ) as compared to the pristine ZnO/GC electrode. Moreover, the electrode also shows good response for human blood serum and commercially available samples. The results demonstrate that defect engineering is a promising route for the development of cost-effective non-enzymatic multi-analyte sensors for practical applications.

Tuning the SERS Capabilities of ZnO Nanowire Arrays Functionalized with Au Quantum Dots for Highly Sensitive Detection of Methylene Blue

“…The close observation shows that Au 4f peaks shift ∼ 0.68 eV towards negative side which ascribed to the electron transfer from Au QDs to ZnO due to their strong interaction. These results agree well with our previous observation as well as reported by Bai et al [26][27][28] O v ). The intensity ratio of O V peak to O L peak (0.49) of O 1s spectra of ZnO@Au QDs (0.6) structure displays an increased amount of oxygen defects compared to other products as shown in Figure S2(a-c).…”

“…The difference between peaks is 23.28 eV, which satisfied the standard value of 22.97 eV. [26] Figure 5(c) reveals the high resolution XPS spectrum in the binding energy range of 80-100 eV. The fitting spectrum consists of two significant binding energy peaks at 83.05 and 86.5 eV corresponding to the electronic states of Au 4f 7/2 and Au 4f 5/2 respectively.…”

Development of MoS2-ZnO heterostructures: an efficient bifunctional catalyst for the detection of glucose and degradation of toxic organic dyes

“…3(c). The binding energy difference between two peaks is slightly higher as compared to previous reports, 59 which is due to the interactions between ZnO andMoS 2 in the heterostructure. Fig.…”

Emerging Trends in Non-Enzymatic Cholesterol Biosensors: Challenges and Advancements

“…It has been reported that the mesoporous nanostructures increase the electrochemically active sites as well as surface area and play a significant role in the construction of non-enzymatic electrodes for cholesterol detection [ 104 ]. The defects in nanostructures lead to the delocalization of electron distribution and promotion of electron excitation responsible for fast charge transportation and increased conductivity [ 105 ]. The electrochemically active sites of the hybrid structures result in a high sensitivity, which makes them a potential candidate for the construction of cost-effective electrochemical biosensors [ 106 ].…”