Structural, electrical and optical properties of K-doped NiO films prepared by rapid pyrolysis sol-gel technique

Wang, N.; Liu, C.Q.; Wen, Chenyu; Wang, H.L.; Liu, S.M.; Jiang, Weiwei; Ding, Wanyu; Chai, Weiping

doi:10.1016/j.tsf.2016.08.051

Cited by 24 publications

(16 citation statements)

References 17 publications

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“…The surface morphologies of the Ni 1–2 x Cu x K x O ( x = 0.04, 0.05) films should be mainly related to the K doping concentration and can be explained according to a previous study . In the process of rapid pyrolysis, for the films with a higher K doping concentration, the pyrolysis gas would be more difficult to release from the coating layer and then would induce swelling of the coating layer.…”

Section: Resultsmentioning

confidence: 92%

“…In the study of Cu‐doped NiO films, there did not appear circular bulges or broken and cracked bulges, although the Cu doping concentration reached 10 atm% or even higher. However, there were some maze‐like bulges, and the bulges were even broken or cracked in the films with a higher K doping concentration . Therefore, the surface morphologies of the films with x = 0.04 and 0.05 should be mainly caused by the high doping concentration of K.…”

Section: Resultsmentioning

confidence: 99%

“…The results of the analyzed molar ratios of [Cu] to [Ni] + [Cu] + [K] and [Cu] to [Ni] + [Cu] + [K] (labeled as [Cu]/([Ni] + [Cu] + [K]) and [K]/([Ni] + [Cu] + [K]), respectively) are shown in Figure . As the same as a previous study the EDS measurement was carried out at three different regions for every sample to measure as accurately as possible the composition, and the results of every sample shown in Figure are an arithmetic average of the three measured results. Clearly, the measured results shown in Figure reveal that the actual doping concentration of Cu and K is well consistent with the theoretical doping concentration.…”

Section: Resultsmentioning

confidence: 99%

“…It is observed that the transmission values of the Cu–K co‐doped films were relatively lower than those of the undoped film on the whole in the visible region except x = 0.02. In order to eliminate the effect of thickness on the optical properties of the films, the absorption coefficient of the Ni 1–2 x Cu x K x O films is calculated by Lambert's formula

α = boldln \frac{1}{T} / d

where T is the transmittance and d is the thickness of film. The calculated absorption coefficients of the films are shown in Figure b.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that the electrical properties can be adjusted by doping appropriate dopants into the NiO crystal lattice. Most of the researches focused on single‐element doping for NiO films, such as K, Cu, Na, and Li, but there are limited studies on the effect of several elements co‐doping on the electrical properties of NiO thin films. The single‐element doping usually optimized only the electrical properties of NiO but deteriorated its optical properties.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cu–K Co‐Doping on the Morphological, Optical, and Electrical Properties of NiO Films Deposited by Spin‐Coating Sol–Gel Method

Song

Liu

Wang

et al. 2020

Physica Status Solidi (a)

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Cu–K co‐doped NiO films (Ni1–2xCuxKxO and x = 0–0.05) are deposited on common glass substrates by the spin‐coating sol–gel method. The phase and the morphological, optical, and electrical properties of NiO films as a function of the Cu–K co‐doping concentration are explored by X‐ray diffraction, scanning electron microscopy, and ultraviolet–visible spectrophotometer and Hall effect measurement systems, respectively. All the films are pure phases of the cubic rock‐salt structure. As the doping concentration increases, the preferred orientation of the Ni1–2xCuxKxO films changes from (200) to (111). Moreover, the surface morphologies of the films are obviously affected by the Cu–K co‐doping concentration. The absorption coefficients of the Cu–K co‐doped NiO films are relatively higher than that of the undoped film on the whole in the visible region except x = 0.02. With the increase in doping concentration, the resistivity of the films decreases on the whole. Finally, the figures of merit (FOM) of the films are considered, and the maximum FOM of the films is achieved at x = 0.02.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

α = boldln \frac{1}{T} / d

where T is the transmittance and d is the thickness of film. The calculated absorption coefficients of the films are shown in Figure b.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Cu–K Co‐Doping on the Morphological, Optical, and Electrical Properties of NiO Films Deposited by Spin‐Coating Sol–Gel Method

Song

Liu

Wang

et al. 2020

Physica Status Solidi (a)

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Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

Bhankhar,

Saini,

Sehrawat

et al. 2024

J of Applied Polymer Sci

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Polyaniline‐potassium doped nickel oxide nanocomposites (PANI/KNO) were efficiently synthesized via an in situ chemical oxidation method, meticulously confirmed by comprehensive x‐ray diffraction, Fourier transformation infrared spectroscopy, energy dispersive x‐ray spectroscopy, selected area electron diffraction, and x‐ray photoelectron spectroscopy analyses. The crystallite size and strain exhibited distinct behaviors, while field emission scanning electron microscopy revealed a blend of irregular spherical shapes and nanofibers, further confirmed by high resolution transmission electron microscopy. These composites exhibited significantly enhanced thermal stability, surpassing PANI by 1.39 times, and showcased a band gap exceeding 3 eV, along with multiple photoluminescence peaks at room temperature (RT). Moreover, their RT AC conductivity experienced a remarkable surge by 4.91 times compared to pure polyaniline. Jonscher's Power Law model and the Havriliak–Negami relaxation model are employed to elucidate the electrical properties of composite materials. The composites displayed nonDebye relaxation behavior with increased conductivity, as observed through impedance analysis, electrical modulus evaluation, and dielectric constant assessment. Additionally, evident superparamagnetic properties and multiple magnetic domains further contributed to their effectiveness. The PANI/KNO composite demonstrated photocatalytic efficiency, achieving over 90% degradation of methylene blue dye across four cycles, thus highlighting its superior photostability. Furthermore, investigations into its response to pH variations and scavenger activity underscored its immense potential for highly effective photocatalytic applications.

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Comparative Analysis of Structural, Optical, and Electronic Properties of Nickel Oxide and Potassium‐Doped Nickel Oxide Nanocrystals

Karishma,

Tripathi,

Pandey

et al. 2024

Energy Storage

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Metal oxide semiconductors, known for their exceptional optical transparency, high carrier mobility, and stability, have found extensive use in emerging technologies such as optoelectronics and energy storage devices. Among all metal oxide semiconductors, nickel oxide (NiO) stands out as a highly favorable candidate due to its p‐type conductivity along with its substantial band gap (3.5–4 eV) for the broad range of applications, including gas sensors, high‐rate Lithium‐ion batteries, high‐performance supercapacitors, and photovoltaic devices. In light of these versatile applications, our current study presents a comprehensive comparative analysis of the structural and optoelectronic properties of NiO and potassium (K)‐doped NiO nanocrystals. The nanocrystals were synthesized using the co‐precipitation route and subsequently annealed at 500°C under ambient conditions. The effect of K doping on the structural and optoelectronic characteristics was systematically examined using various techniques, including x‐ray diffraction, UV–visible spectroscopy, Raman spectroscopy, and Hall effect measurements. To explore the structural characteristics, XRD measurements were performed, which confirm the FCC structure of nanocrystals. The optical property analysis suggested that the formation of the energy level can contribute to reduction of the band gap. A sharp peak at 397 cm−1 is associated with NiO bond in FTIR spectra which verifies the formation of nanocrystals. Moreover, the incorporation of K increases the intensity of the Raman peaks, which provides evidence for the higher degree of crystallinity in doped samples. These results of Raman scattering are in good agreement with XRD outcomes. In addition, the resistivity of NiO nanocrystals decreases monotonically with the increasing K concentration. The results of temperature‐dependent resistivity further demonstrate that electrons required more energy to jump from one polaron state to another in the case of x = 0.01 M and 0.03 M doped Ni0.5‐xKxO samples. The combination of a diminished band gap and enhanced conductivity makes these materials exceptionally promising for applications in optoelectronics and energy storage.

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Structural, electrical and optical properties of K-doped NiO films prepared by rapid pyrolysis sol-gel technique

Cited by 24 publications

References 17 publications

Effects of Cu–K Co‐Doping on the Morphological, Optical, and Electrical Properties of NiO Films Deposited by Spin‐Coating Sol–Gel Method

Effects of Cu–K Co‐Doping on the Morphological, Optical, and Electrical Properties of NiO Films Deposited by Spin‐Coating Sol–Gel Method

Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

Comparative Analysis of Structural, Optical, and Electronic Properties of Nickel Oxide and Potassium‐Doped Nickel Oxide Nanocrystals

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