Synthesis of heavily doped nanocrystalline ZnO:Al powders using a simple soft chemical method

Saravanakumar, Kandasamy; Ravichandran, K.

doi:10.1007/s10854-011-0612-6

Cited by 30 publications

(9 citation statements)

References 51 publications

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“…Experimental Tauc plots were digitized from 73 plots collected from 63 published works, and the extracted slope values were collected into a histogram binned by order of magnitude. Additionally, the collected slopes, NEAR values, and reported and fitted E g values are shown in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Assessing Tauc Plot Slope Quantification: ZnO Thin Films as a Model System

Coulter

Birnie

2017

Physica Status Solidi (b)

213

107

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One of the most frequently used methods for characterizing thin films is UV–Vis absorption. The near‐edge region can be fitted to a simple expression where the intercept gives the band gap and the fitting exponent identifies the electronic transition as direct or indirect. [See Tauc et al., Physica Status Solidi 15, 627 (1966); naturally, these are usually called “Tauc” plots.] In earlier work, we found that direct band gaps fitted using Tauc's method can be quite accurate, to ∼1% [see Viezbicke et al., Phys. Status Solidi B 252, 1700 (2015)]. Still, slopes of these Tauc plots are less frequently quantified, even though the slopes are directly rooted in key band‐structure parameters. In this study, we examine the reproducibility of Tauc plot slopes for ZnO as a model direct‐gap material and compare these experimental values with the theoretically derived slope. In contrast to the band gap accuracy, the experimental slope values varied by several orders of magnitude. The histogram of slope values was significantly more compact for Tauc plots exhibiting less Urbach tail contribution. In these cases, the Tauc slopes can provide an order‐of‐magnitude quantification of other key band characteristics such as carrier effective mass.

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Section: Resultsmentioning

confidence: 99%

Assessing Tauc Plot Slope Quantification: ZnO Thin Films as a Model System

Coulter

Birnie

2017

Physica Status Solidi (b)

213

107

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“…1 confirm the formation of smaller sized zinc oxide nanoparticles [2,23]. The intensity of the strongest peak (101) was reduced in the samples c and d [4]. The diffraction peaks also shifted towards higher angles with the doping of aluminum in zinc oxide lattice of the samples c and d [19].…”

Section: Resultsmentioning

confidence: 60%

“…also the formation of pure and aluminum doped nanoparticles. The peaks at 450 cm −1 , 449 cm −1 in the samples a and b, and 500 cm −1 , 483 cm −1 in the samples c and d confirmed the presence of stretching modes of zinc oxide nanoparticles[4]. The C=O bands were observed around 1400 cm −1 .…”

mentioning

confidence: 51%

“…The electrical conductivity of zinc oxide nanoparticles can be enhanced by the addition of dopants [3]. Zinc oxide nanoparticle is commonly doped with elements, such as Al [4,5], Sn [6], Mn [7], Ni [8], Co [9] and Cu [10]. Zinc oxide nanomaterials are used in such applications as solar cells [11], LPG sensors [12], and antibacterial effects [13].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on room temperature photoluminescence of pure and aluminum doped zinc oxide nanoparticles

Srinivasan¹,

Kannan²

2015

Materials Science-Poland

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Pure and aluminum doped zinc oxide nanoparticles were prepared by soft chemical method. The prepared nanoparticles were characterized by XRD, SEM-EDAX, UV-Vis, PL and FT-IR studies. XRD patterns revealed that the nanoparticles were crystallized in hexagonal wurtzite structure with an average particle size of 19 nm to 26 nm. The surface morphology was explored using SEM micrographs. The incorporation of aluminum was confirmed by EDAX and FT-IR studies. The band gaps of the particles were found from 3.48 eV to 3.53 eV through UV-Vis spectral studies. The defect related mechanism was investigated using PL measurements. The chemical functional groups in FT-IR spectra proved the formation of pure and aluminum doped zinc oxide nanoparticles.

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“…The band at $ 1530 cm À 1 and $ 1360 cm À 1 are due to the carboxyl group of symmetric and asymmetric stretching vibration of CQO, respectively [33]. The absorption band at $ 3400 cm À 1 is attributed to the hydroxyl stretching mode of O-H [34] which confirms the presence of hydroxyl group in the final product that is mainly responsible for the antibacterial activity of synthesized ZnO nanopowders.…”

Section: Ftir Studiesmentioning

confidence: 63%