Study of electrical properties of nickel doped SnO2 ceramic nanoparticles

Azam, Ameer; Ahmed, Arham S.; Ansari, M. Shahnawaze; M, Muhamed Shafeeq; Naqvi, Andleeb Z.

doi:10.1016/j.jallcom.2010.06.184

Cited by 146 publications

(50 citation statements)

References 29 publications

(28 reference statements)

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“…An extrapolation of the linear region of a plot of (˛h ) 2 vs. h gives the value of the optical band gap E g [46]. The measured band gaps are displayed in Table 1, which shows a slight increase with the increase in dopant concentration.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Co substitution on the structural and optical properties of ZnO nanoparticles synthesized by sol–gel route

Arshad

Azam

Ahmed

et al. 2011

Journal of Alloys and Compounds

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185

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Section: Resultsmentioning

confidence: 99%

“…4. The absorbance is expected to depend on several factors, such as band gap, oxygen deficiency surface roughness and impurity centers [46]. Absorbance spectra exhibits an absorption edges of pure and 5 at% Co doped ZnO are 386 and 376 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Co substitution on the structural and optical properties of ZnO nanoparticles synthesized by sol–gel route

Arshad

Azam

Ahmed

et al. 2011

Journal of Alloys and Compounds

Self Cite

185

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“…In addition to the above, as the doping concentration of Co 2? ions is increased, oxygen vacancy concentration is increased, thus promoting more oxygen absorption and increase the thickness of the depletion layers on the surface [46][47][48].Thereby, resulting in decreased carrier concentration and increased resistivity. The impurity phases thus formed acts as a acceptor energy levels which in turn greatly Fig.…”

Section: Effect Of Impuritiesmentioning

confidence: 99%

Microwave assisted synthesis of Sn(1−x)CoxO2 nanoparticles: effect of impurity phase formation on structural, optical and electrochemical properties

Sephra

Baraneedharan

Chidambaram

et al. 2016

J Mater Sci: Mater Electron

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Nanocrystalline Sn (1-x) Co x O 2 (x = 0, 0.01, 0.03 and 0.05) nanoparticles have been synthesized under microwave irradiation using oxalic acid (H 2 C 2 O 4 ) as reducing agent. X-ray diffraction studies show that the prepared nanoparticles are crystalline with tetragonal crystal system and with few additional phases, which is further supported by Raman spectroscopy. The variation in molar concentration of Co 2? ions had a significant effect on size and morphological aspects which is evident from high resolution microscopic images. The emission owing to band edge position, recombination with V o ?? centers and recombination with shallow level defects were observed from the Photoluminescence spectrum. The existence of room temperature ferromagnetism has been clearly observed using magnetization hysteresis measurements and the magnetic moments are found to decrease with the increased cobalt ions concentration. The decrease in charge carriers that arises due to the formed impurity phases and its significant effect on electron transfer capability have been discussed with the assistance of cyclic voltammetry. This study possibly will bring better insight for understanding the effects of doping concentration, formation of impurity phases and explicate the consequences of them on various properties of nanostructured materials.

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“…Meanwhile, the asymmetric characteristic also indicates that the presence of temperature dependent relaxation processes in the ceramics. The relaxing species in the ceramics may be the immobile electrons at low temperatures and defects at high temperatures [12,35].…”

Section: Electric Modulus Analysismentioning

confidence: 99%

Zr-substituted SnO2-based NTC thermistors with wide application temperature range and high property stability

Ouyang

Zhang

2015

J Mater Sci: Mater Electron

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Zr-substituted SnO 2 -based ceramics (Sn 0.95-x Sb 0.05 Zr x O 2 , x B 0.1) were prepared by using a wet-chemical synthesis method. The results show that the prepared ceramics have a pure tetragonal phase as that of SnO 2 and have a typical characteristic of negative temperature coefficient (NTC) of resistivity over a wide temperature range from -50 to 300°C. The room-temperature resistivity q 25 and material constant B 25/85 of the NTC thermistors increase from 4.77 X cm to 4.89 9 10 7 X cm and from 641 to 5085 K, respectively, when the content of Zr, x, changes from 0 to 0.1. The NTC thermistors also show high cyclic stability and ageing resistance. The analysis of impedance spectra reveals that the NTC effect mainly resulted from the grain-boundary contribution, and the conduction mechanisms of the Sn 0.95-x Sb 0.05 Zr x O 2 thermistors combine with the electron-hopping conduction and band conduction.

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Study of electrical properties of nickel doped SnO2 ceramic nanoparticles

Cited by 146 publications

References 29 publications

Effect of Co substitution on the structural and optical properties of ZnO nanoparticles synthesized by sol–gel route

Effect of Co substitution on the structural and optical properties of ZnO nanoparticles synthesized by sol–gel route

Microwave assisted synthesis of Sn(1−x)CoxO2 nanoparticles: effect of impurity phase formation on structural, optical and electrochemical properties

Zr-substituted SnO2-based NTC thermistors with wide application temperature range and high property stability

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