Application of Electrochemical Impedance for Characterising Arrays of Bi2S3 Nanowires

Kunakova, Gunta; Katkevics, J; Vīksna, Artūrs; Gertnere, Zanda; Varghese, Justin Manjaly; Holmes, Justin D.; Erts, Donāts

doi:10.1016/j.electacta.2015.04.021

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Previously, the AAO membranes have proven to be ideal substrates for the production of nanowire arrays using electrochemical, supercritical fluid and CVD-based techniques 19–23 , as well as for sorting and ordering of nanoparticles on the surface of AAO membranes 24,25 , and enhancement of plasmonic scattering in structured Al-AAO-Au layers 26 . In this work, porous anodized aluminium oxide (AAO) substrates are used for catalyst-free PVD synthesis of Bi 2 Se 3 nanoribbons.…”

Section: Introductionmentioning

confidence: 99%

Surface structure promoted high-yield growth and magnetotransport properties of Bi2Se3 nanoribbons

Kunakova

Meija

Andzane

et al. 2019

Sci Rep

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In the present work, a catalyst-free physical vapour deposition method is used to synthesize high yield of Bi 2 Se 3 nanoribbons. By replacing standard glass or quartz substrates with aluminium covered with ultrathin porous anodized aluminium oxide (AAO), the number of synthesized nanoribbons per unit area can be increased by 20–100 times. The mechanisms of formation and yield of the nanoribbons synthesized on AAO substrates having different arrangement and size of pores are analysed and discussed. It is shown that the yield and average length of the nanoribbons can base tuned by adjustment of the synthesis parameters. Analysis of magnetotransport measurements for the individual Bi 2 Se 3 nanoribbons transferred on a Si/SiO 2 substrate show the presence of three different populations of charge carriers, originating from the Dirac surface states, bulk carriers and carriers from a trivial 2DEG from an accumulation layer at the Bi 2 Se 3 nanoribbon interface with the substrate.

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Section: Introductionmentioning

confidence: 99%

Surface structure promoted high-yield growth and magnetotransport properties of Bi2Se3 nanoribbons

Kunakova

Meija

Andzane

et al. 2019

Sci Rep

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“…At all RH, the resistance of a metallic electrode ( R 1 ) is much smaller than the load resistance R 2 from the CuO nanowire interconnects ( Figure 4a ). An increase of Y 0 , which is a frequency-independent component of C or Q , with RH above 50–60% ( Figure 4b ) can mean that the polarization of water molecules on the surface of the nanowires becomes stronger when the thickness of the physisorbed water layer grows [ 27 , 32 ]. At RH above 60% ( Figure 4b ) the Warburg element appears and it grows with increasing the humidity, which suggests increased contribution of the diffusion processes to the total impedance with increased thickness of the water layer adsorbed at the nanowire interconnects ( Figure 3e ) and condensation of liquid water in pores.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, CuO nanowires are synthesized by thermal oxidation [ 9 ] and aligned between metallic microelectrodes by DEP [ 26 ]. Electrical properties of the nanowire-based system at various RH values are assessed by EIS [ 27 – 28 ]. To attempt a systematic study on the suitability of the CuO nanowire networks for different applications, the measurements are performed in a RH range from 5% up to 97% and in a T range of 25–55 °C, which covers wider RH and T ranges than previous studies.…”

Section: Introductionmentioning

confidence: 99%

Humidity-dependent electrical performance of CuO nanowire networks studied by electrochemical impedance spectroscopy

Kosmača¹,

Katkevics²,

Andzane³

et al. 2023

Beilstein J. Nanotechnol.

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Electrochemical impedance spectroscopy was applied for studying copper oxide (CuO) nanowire networks assembled between metallic microelectrodes by dielectrophoresis. The influence of relative humidity (RH) on electrical characteristics of the CuO nanowire-based system was assessed by measurements of the impedance Z. A slight increase of Z with increasing RH at low humidity was followed by a three orders of magnitude decrease of Z at RH above 50–60%. The two opposite trends observed across the range of the examined RH of 5–97% can be caused by water chemisorption and physisorption at the nanowire interface, which suppress electronic transport inside the p-type semiconductor nanowire but enhance ionic transport in the water layers adsorbed on the nanowire surface. Possible physicochemical processes at the nanowire surface are discussed in line with equivalent circuit parameters obtained by fitting impedance spectra. The new investigation data can be useful to predict the behavior of nanostructured CuO in humid environments, which is favorable for advancing technology of nanowire-based systems suitable for sensor applications.

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Morphology control and photocatalytic properties of ZnO sheets grown on an AAO template

Yang

Wang

Liu

et al. 2021

Ceramics International

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Application of Electrochemical Impedance for Characterising Arrays of Bi2S3 Nanowires

Cited by 6 publications

References 25 publications

Surface structure promoted high-yield growth and magnetotransport properties of Bi2Se3 nanoribbons

Surface structure promoted high-yield growth and magnetotransport properties of Bi2Se3 nanoribbons

Humidity-dependent electrical performance of CuO nanowire networks studied by electrochemical impedance spectroscopy

Morphology control and photocatalytic properties of ZnO sheets grown on an AAO template

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