Absorption Spectroscopic Analysis of ZnO Nanoparticles

Samanta, Pijus Kanti; Kamilya, Tapanendu; Bhunia, Amit Kumar; Mandal, S. C.

doi:10.1166/asem.2016.1844

Cited by 5 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average Urbach energy for ZnO nanocrystals was calculated to be 0.702 eV, 0.901 eV, and 0.993 eV for the 8 h, 12 h, and 16 h ZnO nanocrystals respectively; these reports were very close to the other reported value of 0.61 eV. [ 39,40 ] Here the Urbach energy value increased with decrease in the ZnO nanocrystal band gap. [ 41 ] The change in Urbach energy in our case may be due to changes in crystallite size, crystal disorder, strong bonding, and average photon energies of the ZnO nanocrystals compared with their bulk crystal.…”

Section: Resultssupporting

confidence: 53%

Characterization of zinc oxide nanocrystals with different morphology for application in ultraviolet‐light photocatalytic performances on rhodamine B

Bhunia

Saha

2020

Luminescence

Self Cite

View full text Add to dashboard Cite

ZnO nanostructures of different morphology (nanorods, nano‐leaf, nanotubes) were favourably grown using a chemical precipitation process. The prepared ZnO nanostructures were characterized systematically using absorption spectroscopy, emission spectroscopy, X‐ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared studies. XRD results showed the hexagonal wurtzite phase of the synthesized ZnO nanostructures. Structural properties such as average crystallite size, lattice constants, volume of the unit cell, atomic fraction, and structural bonds were also studied. The optical band gap of the synthesized ZnO nanocrystals varied from 3.52 eV to 3.69 eV with high quantum yield of the blue emission (~420 nm). Urbach energy for ZnO nanocrystals was calculated to be 0.702 eV, 0.901 eV, and 0.993 eV for nanorods, nano‐leaf, and tube like ZnO crystals, respectively. Morphology of the fabricated nanostructures was investigated using SEM. Photocatalytic degradation of rhodamine B (Rh B) in solution under UV irradiation was explored with different ZnO morphology. Photocatalytic experiments showed that ZnO nano‐leaf had a higher degradation rate of photocatalytic activity of photodegrading Rh B compared with the other tube shape and rods shape nanostructures. The Rh B dye degraded considerably by ∼79.05%, 74.41%, and 69.8% within 120 min in the presence of the as‐fabricated fern nano‐leaf, nanotubes, and nanorods of the ZnO nanocrystals at room temperature.

show abstract

Section: Resultssupporting

confidence: 53%

Characterization of zinc oxide nanocrystals with different morphology for application in ultraviolet‐light photocatalytic performances on rhodamine B

Bhunia

Saha

2020

Luminescence

Self Cite

View full text Add to dashboard Cite

show abstract

“…2c gives the value of Urbach energy (E U ). The average value of E U , calculated from the slope of the straight line is found to be 0.766 eV [34]. Physically, this E U value signifies the crystal disorderness due to the transition from the bulk to nanoregion.…”

Section: Uv-vis Spectrum and Optical Propertiesmentioning

confidence: 92%

Study of the optical properties and frequency-dependent electrical modulus spectrum to the analysis of electric relaxation and conductivity effect in zinc oxide nanoparticles

Bhunia¹,

Pradhan

Bhunia

et al. 2021

J Mater Sci: Mater Electron

Self Cite

View full text Add to dashboard Cite

In this article, the optical and dielectric properties along with electric relaxation behaviour of the zinc oxide nanoparticles (ZnO NPs) with an average size & 32.5 nm were studied. The band gap, and free carrier concentration of the ZnO NPs have been found to be 3.73 eV, and & 5.55 9 10 12 per cm 3 , respectively. Dispersion parameters and nature of dispersion have been studied from optical spectrum. X-ray diffraction investigation revealed that the crystalline phase is hexagonal with atomic fraction & 75.44%. The overall behaviour of the dielectric constants of ZnO NPs has obeyed Koops model. Relaxation behaviour and defect state response inside ZnO NPs have been observed in the dielectric studies. The relaxation time varies from 8.0585 9 10 -5 to 7.8447 9 10 -5 s with temperature (T) ranges from 323 to 573 K, respectively, calculated from the electric modulus study. The AC conductivity complies the Jonscher's universal power law and the observed hopping of electron is the correlated barrier hopping. The activation energy of the ZnO NPs is found to be & 93 meV from the temperature-dependent DC conductivity analysis. The real part of complex impedance showed a negative temperature coefficient of resistance nature with increase the temperature from 473 to 673 K in the low-frequency zone. The equivalent circuit for the complex impedance analysis at T = 673 K has been studied from Cole-Cole equation and Nyquist plot. The observed properties of ZnO NPs are very important for electric storage, sensing and optical semiconductor devices.

show abstract

“…Transition of carriers from these lower band gap energy states leads to visible emission from ZnO. Several researchers have reported blue, green, blue-green and violet photoluminescence from ZnO nanostructures due to specific type of defect states [4][5][6][7][8][9][10]. ZnO also exhibit ferromagnetism at room temperature [11].…”

Section: Introductionmentioning

confidence: 99%

Review on Wet Chemical Growth and Anti-bacterial Activity of Zinc Oxide Nanostructures

Samanta¹

2017

J Tissue Sci Eng

Self Cite

View full text Add to dashboard Cite

Metal oxide semiconductor nanostructures are of keen interest to the researchers as they exhibit multifunctional properties compared to their bulk counterpart. Amongst several metal-oxide nanostructures zinc oxide is very popular because of its unique optoelctronic properties which are of wide importance in the field of nano-optoelectronic devices. Moreover, it also exhibit antibacterial activity which is very important in the field of medical science. This article briefly summarizes the wet chemical growth and anti-bacterial activity of several ZnO nanostructures with a view to provide the reader an overall feature of ZnO nanostructures. -Oxygen atom -Zinc atom

show abstract

Absorption Spectroscopic Analysis of ZnO Nanoparticles

Cited by 5 publications

References 0 publications

Characterization of zinc oxide nanocrystals with different morphology for application in ultraviolet‐light photocatalytic performances on rhodamine B

Characterization of zinc oxide nanocrystals with different morphology for application in ultraviolet‐light photocatalytic performances on rhodamine B

Study of the optical properties and frequency-dependent electrical modulus spectrum to the analysis of electric relaxation and conductivity effect in zinc oxide nanoparticles

Review on Wet Chemical Growth and Anti-bacterial Activity of Zinc Oxide Nanostructures

Contact Info

Product

Resources

About