Electrolyte Effect on Nanotubes Properties

Davis, Daniel Cochece; Pinisetty, Dinesh; Prabhakar, Aparna; Moldovan, M.; Young, David P.; Devireddy, Ram V.; Murphy, Michael W.; Podlaha, E. J.

doi:10.1149/1.2794471

Cited by 10 publications

(8 citation statements)

References 10 publications

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“…30 Recently, Davis' group reported on the electrodeposition and thermoelectric characterization of bismuth telluride nanotubes in an alumina template. 31 Zhou's group electrodeposited bismuth telluride nanowires in an anodic aluminum oxide ͑AAO͒ membrane and measured the thermoelectric characteristics of individual nanowires. 14 However, studies on the thermoelectric properties of n-and p-type nanowires are still scattered, and a more complete analysis is needed.…”

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confidence: 99%

Electrodeposition and Thermoelectric Characterization of Bismuth Telluride Nanowires

Mannam

Agarwal

Roy

et al. 2009

J. Electrochem. Soc.

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Bismuth telluride (BixTey) nanowires were electrodeposited from aqueous acidic solutions containing different Bi3+/HTeO2+ (20/20 and 20/10 mM) concentration ratios. The polarization plots predicted that combined solutions exhibit more noble reduction potentials than individual solutions. Optimized deposition potentials were obtained from the combined electrolyte polarization plots. An anomalous codeposition behavior caused an increase in Te concentration for depositions in the kinetic region of bismuth telluride; otherwise, decreasing Te concentrations with increased deposition potentials was observed from a composition analysis. X-ray diffraction showed a dominant (110) orientation for nanowires at low deposition potentials. n-Type nanowires were obtained from both electrolytes, while p-type nanowires were only obtained from the 20/10 electrolyte for low Te (<30%) concentrations. An intrinsic to extrinsic transition was observed for nanowires deposited from the 20/10 electrolyte. The highest measured Seebeck coefficient was −318.7 and 117μV/K for n- and p-type nanowires, respectively. The Seebeck coefficient dependence on the resistivity and composition of the nanowires is discussed.

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confidence: 99%

Electrodeposition and Thermoelectric Characterization of Bismuth Telluride Nanowires

Mannam

Agarwal

Roy

et al. 2009

J. Electrochem. Soc.

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“…Template based electrodeposition [48][49][50][51] of Sb 2 Te 3 nanowires/ nanotubes was carried out at room temperature in a typical three-electrode cell setup. A schematic of nanowires and nanotubes fabrication using template-based electrodeposition technique is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…A bottom-up fill inside the pores is achieved, as the only conductive surface is the gold base at the bottom of the pores. The Sb 2 Te 3 nanowires/nanotubes were galvanostatically deposited by using the template-based synthesis technique [48][49][50][51] in which an appropriate current/potential is applied to the solution causing Sb and Te to deposit within the pores of the gold-sputtered PC membrane. At short times, double layer charging causes a large current response, which decays very quickly to a steady Faradaic current.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and characterization of electrodeposited antimony telluride crystalline nanowires and nanotubes

et al. 2011

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Arrays of nanowires and nanotubes of antimony-telluride (Sb 2 Te 3 ) have been fabricated by an electrodeposition technique. Scanning electron microscopy was employed to characterize the morphology and size of the fabricated Sb 2 Te 3 nanowires and nanotubes. Wavelength dispersive spectroscopy analysis confirmed the composition of the fabricated nanowires and nanotubes. The composition of the nanowires fabricated at a cathodic current density of 10 mA cm À2 and nanotubes fabricated at a cathodic current density of 5.5 mA cm À2 was found to be $39% Sb and $61% Te (2 : 3 ratio between Sb and Te). The fabricated Sb 2 Te 3 nanowire and nanotube arrays were found to be polycrystalline with no preferred orientation. The average lamellar thickness of the nanowires and nanotube crystallites was determined using the Scherrer equation and found to be $36 nm and $43 nm, respectively. The measured room temperature Seebeck coefficients for the Sb 2 Te 3 nanowires and nanotubes were +359 mV K À1 and +332 mV K À1 , respectively, confirming that the Sb 2 Te 3 nanowires and nanotubes were p-type. The electrical resistance measurements indicated that the resistance of the Sb 2 Te 3 nanowires and nanotubes decreased with increasing temperature, consistent with semiconducting behavior.

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“…purchased from Sol-1 and sol-2 are 2.5M HNO 3 electrolytes containing 20mM Bi 3+ -20mM HTeO 2 + and 20mM Bi 3+ -10mM HTeO 2 + , respectively. GMR layers were obtained from an aqueous solution containing 25mM NiSO 4 , 50mM CoSO 4 , and 1mM CuSO 4 using a pulsed potential technique (12). The reference and counter electrodes were Saturated Calomel Electrode (SCE) and a platinum (99.99%) mesh, respectively.…”

Section: Methodsmentioning

confidence: 99%

Novel Thermoelectric Cooling of Magnetic Sensors

et al. 2009

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In situ thermoelectric cooling of GMR nanowires is a novel method to obtain reliable and more sensitive GMR devices. Bismuth telluride (BixTey) caps were used to provide localized thermoelectric cooling of GMR nanowires. BixTey nanowires were electrodeposited from aqueous acidic solutions containing different Bi3+ and HTeO2+ concentrations. GMR layered structures were electrodeposited from a Co-rich electrolyte using a pulsed potential technique. The highest Seebeck coefficients of -318.7 µV/K and 117 µV/K were measured for n-type and p-type nanowires, respectively. P-type nanowires were obtained for low Te concentrations (<30%). Initial experiments were conducted to study the effect of thermoelectric cooling on sensitivity of GMR nanowires. Results showed that using BixTey caps can improve magnetic sensitivity of GMR nanowires.

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Electrolyte Effect on Nanotubes Properties

Cited by 10 publications

References 10 publications

Electrodeposition and Thermoelectric Characterization of Bismuth Telluride Nanowires

Electrodeposition and Thermoelectric Characterization of Bismuth Telluride Nanowires

Fabrication and characterization of electrodeposited antimony telluride crystalline nanowires and nanotubes

Novel Thermoelectric Cooling of Magnetic Sensors

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