Single-step hydrothermal synthesis of nitrogen-doped ZnO nanostructures and an insight into its electrochemical properties

Manoj, Alisha Mary; Viannie, Leema Rose; Subramaniam, C. K.; Raj, N. Arunai Nambi; Manivasagam, Geetha

doi:10.1557/s43578-020-00008-1

Cited by 6 publications

(4 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The (αhγ) 2 versus hγ plot is shown in figure 3(b), and the optical band gap of the ZnO nanodots was estimated by the Kubelka-Munk model [59] to be ∼3.34 eV. This value is smaller than the band gap of a pure undoped ZnO (3.37 eV) reported [48]. This band narrowing is due to the incorporation of the nitrogen atoms inside the ZnO lattices.…”

Section: Resultsmentioning

confidence: 91%

“…All the peaks can be indexed to the crystal planes of the hexagonal wurtzite ZnO [47]. Furthermore, the peaks exhibited a redshift, which demonstrated that the incorporation of nitrogen caused a slight distortion of the lattice [48]. The average crystallite size of the ZnO was calculated to be 10 nm by using the Scherrer formula for the (101) facet diffraction peak.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanohybrids that consisit of p-type, nitrogen-doped ZnO and graphene nanostructures: synthesis, photophysical properties, and biosensing application

Chen¹,

Zheng²,

Zheng³

et al. 2022

Nanotechnology

View full text Add to dashboard Cite

ZnO, a promising material for optoelectronic applications, has attracted considerable attention due to its wide and direct band gap and large exciton binding energy. To understand the applications of this material, fabrication of high quality p-type ZnO is a key step. However, a reliable p-type doping of this material remains a major challenge. In this study, we report p-type nitrogen-doped ZnO nanoparticle, grown in a nitrogen doped graphene layer matrix by a plasma heating process using a natural protein and zinc nitrate as the precursors. The structural characterizations are developed by several microscopic techniques including the field emission electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and micro-Raman analysis. In addition, the ultraviolet (UV)-visible absorption characteristics and photoluminescence properties of the samples are studied. Its p-type conduction behaviour is confirmed by the Hall effect measurement, which was ascribed to the high nitrogen dopant concentration in the Zn-poor ZnO, and the related mechanism for the p-type behaviour is also discussed. Moreover, the results of the glucose detection based on the strong green luminescence of glucose indicate that the nitrogen-doped ZnO nanodots/nitrogen-doped graphene layer nanohybrid is also a competitive candidate in the biosensing field.

show abstract

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Nanohybrids that consisit of p-type, nitrogen-doped ZnO and graphene nanostructures: synthesis, photophysical properties, and biosensing application

Chen¹,

Zheng²,

Zheng³

et al. 2022

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…The synthesis of nitrogen-doped zinc oxide nanostructures has been achieved by a single-step hydrothermal procedure, as discussed in our previous literature [35], and the sample showing maximum nitrogen incorporation was determined by optimising the amount of nitrogen precursor in the hydrothermal process. In the typical procedure, 10 mL of 0.1 M of Zn (Ac) 2 • 2H 2 O (in DI water) and 10 mL of 0.5 M of NaOH (in DI water) were added to 30 mL of ethanol at room temperature with constant stirring at 600 rpm for 30 min.…”

Section: Synthesis Of Zno Nanostructuresmentioning

confidence: 99%

Electrochemical pH sensing characteristics of nitrogen‐doped zinc oxide nanostructures using a screen‐printed platform**

Mary Manoj,

Rose Viannie

2023

Electroanalysis

View full text Add to dashboard Cite

Monitoring pH variations is of vital importance in the field of medical diagnostics and healthcare devices. Employing zinc oxide (ZnO) nanomaterials as active sensing elements allows sensitivity enhancement by increasing the surface area of the nanomaterials used and improving the charge transfer mechanism in the sensor. In this study, an electrochemical pH sensor based on nitrogen‐doped zinc oxide nanosheets was developed using a single step hydrothermal technique. The results obtained show the successful incorporation of nitrogen into the crystal structure of ZnO nanosheets. The sensing platform was fabricated using a simple mask‐printing technique using carbon electrodes on a polyimide substrate. The sensing characteristics of nitrogen‐doped ZnO (N−ZnO) nanosheets as pH sensors are evaluated for the first time. The results show that the response time and performance improved with nitrogen doping, for a lower analyte volume of just 5 mL. Furthermore, the detailed mechanism of pH sensing was formulated using electrochemical impedance spectroscopy (EIS). The resistance obtained was directly proportional to the charge‐transfer resistance at the electrode‐electrolyte interface for N−ZnO. The sensitivity as determined by charge‐transfer resistance is 0.512 MΩ/pH. Further, the chronoamperometric studies show a sensitivity of 0.156 μA/pH. The response characteristics also reveal a linearity of 0.965 over a pH range of 3 to 9. Hence, the study shows the exceptional response of N−ZnO nanostructures in pH sensing applications. The advantages of the N−ZnO nanosheets include higher sensitivity, flexibility, and a smaller volume of testing fluid that promotes their easy integration into various analytical applications.

show abstract

“…In the present work, we optimize the amount of nitrogen doping into the crystal lattice of ZnO synthesized by a single‐step hydrothermal method as discussed in our previous work. [ 18 ] Different weight percentages of urea were used for doping nitrogen into the crystal lattice of ZnO. The as‐prepared samples were treated under different annealing environment and their effect on the nitrogen incorporation properties was studied.…”

Section: Introductionmentioning

confidence: 99%

Insights into Effects of Annealing Environment on the Changes in Structural Properties and Electrochemical Performance of Nitrogen‐Doped Zinc Oxide Nanosheets

Manoj

Viannie

2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

Herein, the effect of the postannealing process on the structural properties of nitrogen‐doped Zinc oxide nanostructures (N‐ZnO) synthesized by a single‐step hydrothermal method is reported. Detailed structural and compositional characterizations are performed using X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and energy‐dispersive spectroscopy (EDS). Also, the amount of nitrogen doping has been optimized using different concentrations of the precursor solutions and they are subjected to different postannealing environments. The postannealing process is found to alter the defect structure in ZnO significantly. The samples showing the highest nitrogen doping are further evaluated in detail to know their structural variations. The incorporation of nitrogen into the ZnO structure and the effects of the postannealing process substantially alter the electrochemical characteristics by changing the surface properties of ZnO nanosheets. The effect of these structural variations on the electrochemical performance of ZnO is also explored. Under optimized conditions, the highest conductivity of N‐ZnO nanostructures obtained suggests the material as an outstanding candidate for electrochemical applications.

show abstract

Single-step hydrothermal synthesis of nitrogen-doped ZnO nanostructures and an insight into its electrochemical properties

Cited by 6 publications

References 52 publications

Nanohybrids that consisit of p-type, nitrogen-doped ZnO and graphene nanostructures: synthesis, photophysical properties, and biosensing application

Nanohybrids that consisit of p-type, nitrogen-doped ZnO and graphene nanostructures: synthesis, photophysical properties, and biosensing application

Electrochemical pH sensing characteristics of nitrogen‐doped zinc oxide nanostructures using a screen‐printed platform**

Insights into Effects of Annealing Environment on the Changes in Structural Properties and Electrochemical Performance of Nitrogen‐Doped Zinc Oxide Nanosheets

Contact Info

Product

Resources

About