Dielectrophoretic alignment and electrical characterization of CuO nanowire-based systems

Katkevics, J; Jasulaneca, Liga; Kunakova, Gunta; Sondors, Raitis; Meija, Raimonds; Erts, Donāts; Kosmača, Jeļena

doi:10.1016/j.surfin.2021.101531

Cited by 2 publications

(3 citation statements)

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“…The average diameters of the individual CuO nanowires, determined from the SEM images, were 50–100 nm, and their lengths varied between 2 and 20 µm ( Figure 1a ). To optimize the dielectrophoretic alignment of nanowires of such lengths and to maximize the number of the nanowire interconnects, the distance between the metallic microelectrodes was varied from 2 to 8 µm [ 26 ]. The arrays of microelectrode pairs with different gap distances were grouped in four rows on a chip ( Figure 1b ).…”

Section: Resultsmentioning

confidence: 99%

“…These nanowires were assembled on arrays of Cr/Au (3/60 nm) microelectrodes lithographically pre-patterned on a commercially available Si/SiO 2 wafer substrate (MTI Corporation) diced in 10 × 10 mm 2 chips. To assemble the nanowires by dielectrophoresis, the chip was submerged in a suspension of the nanowires in IPA, and an AC voltage (5 V peak to peak, 5–50 kHz) was applied between the microelectrodes for 20 min [ 26 ]. Nanowires and microelectrodes were examined by scanning electron microscopy (SEM, Hitachi S4800) and atomic force microscopy (AFM, Asylum Research MFP-3D).…”

Section: Methodsmentioning

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 ].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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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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Size Distribution, Mechanical and Electrical Properties of CuO Nanowires Grown by Modified Thermal Oxidation Methods

et al. 2020

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Size distribution, Young’s moduli and electrical resistivity are investigated for CuO nanowires synthesized by different thermal oxidation methods. Oxidation in dry and wet air were applied for synthesis both with and without an external electrical field. An increased yield of high aspect ratio nanowires with diameters below 100 nm is achieved by combining applied electric field and growth conditions with additional water vapour at the first stage of synthesis. Young’s moduli determined from resonance and bending experiments show similar diameter dependencies and increase above 200 GPa for nanowires with diameters narrower than 50 nm. The nanowires synthesized by simple thermal oxidation possess electrical resistivities about one order of magnitude lower than the nanowires synthesized by electric field assisted approach in wet air. The high aspect ratio, mechanical strength and robust electrical properties suggest CuO nanowires as promising candidates for NEMS actuators.

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Dielectrophoretic alignment and electrical characterization of CuO nanowire-based systems

Cited by 2 publications

References 30 publications

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

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

Size Distribution, Mechanical and Electrical Properties of CuO Nanowires Grown by Modified Thermal Oxidation Methods

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