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Electrodeposition of bismuth telluride from a weakly coordinating, non-aqueous solution

Electrodeposition of bismuth telluride from a weakly coordinating, non-aqueous solution
Electrodeposition of bismuth telluride from a weakly coordinating, non-aqueous solution

We report the electrodeposition of bismuth telluride thin films on to titanium nitride (TiN) electrodes from a weakly coordinating solvent, dichloromethane (CH 2 Cl 2 ), using the halometallates, [N n Bu 4 ][BiCl 4 ] and [N n Bu 4 ] 2 [TeCl 6 ] with 0.1 M [N n Bu 4 ]Cl as the supporting electrolyte. The elemental composition of the electrodeposited films was found to be independent of the deposition potential between −0.6 and −2.0 V vs. Ag/AgCl but to be dependent on ratio of the concentrations of the Bi and Te precursors in the solution, with the amount of bismuth in the films increasing when the concentration of [N n Bu 4 ][BiCl 4 ] in solution was increased. All the electrodeposited films were found to be homogenous in composition across the electrode surface and to be reproducible in composition for replicate experiments. As the deposition potential was taken less negative, the morphology of the deposits changed from uniform films to films with a compact micro/nano particle structure as seen by scanning electron microscopy (SEM). Using this system, the electrodeposition of crystalline Bi 2 Te 3 and Bi 4 Te 3 was confirmed by energy dispersive spectroscopy (EDX) and grazing incidence X-ray diffraction.

Bismuth telluride, Dichloromethane, Electrodeposition, Halometallates, Non-aqueous
1572-6657
134-140
Meng, Lingcong
8de7a0cb-c6aa-4dfd-94f5-bcdae5105a56
Cicvarić, Katarina
ed688ac1-6d46-4481-8825-9e3978dabfd1
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
de Groot, C.H.
92cd2e02-fcc4-43da-8816-c86f966be90c
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Meng, Lingcong
8de7a0cb-c6aa-4dfd-94f5-bcdae5105a56
Cicvarić, Katarina
ed688ac1-6d46-4481-8825-9e3978dabfd1
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
de Groot, C.H.
92cd2e02-fcc4-43da-8816-c86f966be90c
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075

Meng, Lingcong, Cicvarić, Katarina, Hector, Andrew L., de Groot, C.H. and Bartlett, Philip N. (2019) Electrodeposition of bismuth telluride from a weakly coordinating, non-aqueous solution. Journal of Electroanalytical Chemistry, 839, 134-140. (doi:10.1016/j.jelechem.2019.03.021).

Record type: Article

Abstract

We report the electrodeposition of bismuth telluride thin films on to titanium nitride (TiN) electrodes from a weakly coordinating solvent, dichloromethane (CH 2 Cl 2 ), using the halometallates, [N n Bu 4 ][BiCl 4 ] and [N n Bu 4 ] 2 [TeCl 6 ] with 0.1 M [N n Bu 4 ]Cl as the supporting electrolyte. The elemental composition of the electrodeposited films was found to be independent of the deposition potential between −0.6 and −2.0 V vs. Ag/AgCl but to be dependent on ratio of the concentrations of the Bi and Te precursors in the solution, with the amount of bismuth in the films increasing when the concentration of [N n Bu 4 ][BiCl 4 ] in solution was increased. All the electrodeposited films were found to be homogenous in composition across the electrode surface and to be reproducible in composition for replicate experiments. As the deposition potential was taken less negative, the morphology of the deposits changed from uniform films to films with a compact micro/nano particle structure as seen by scanning electron microscopy (SEM). Using this system, the electrodeposition of crystalline Bi 2 Te 3 and Bi 4 Te 3 was confirmed by energy dispersive spectroscopy (EDX) and grazing incidence X-ray diffraction.

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Accepted/In Press date: 11 March 2019
e-pub ahead of print date: 12 March 2019
Published date: 15 April 2019
Keywords: Bismuth telluride, Dichloromethane, Electrodeposition, Halometallates, Non-aqueous

Identifiers

Local EPrints ID: 430214
URI: http://eprints.soton.ac.uk/id/eprint/430214
ISSN: 1572-6657
PURE UUID: 8a3134ba-879e-4056-a19f-eceb966f34bc
ORCID for Lingcong Meng: ORCID iD orcid.org/0000-0002-3995-3584
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163
ORCID for C.H. de Groot: ORCID iD orcid.org/0000-0002-3850-7101
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

Catalogue record

Date deposited: 16 Apr 2019 16:30
Last modified: 07 Oct 2020 06:35

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