Self-assembled films of nickel hexacyanoferrate: Electrochemical properties and application in potassium ion sensing

Self-assembled films of nickel hexacyanoferrate: Electrochemical properties and application in potassium ion sensing

Pressure-area isotherms of hexametaphosphate (HMP) stabilized nickel hexacyanoferrate (NiHCF) nanocrystals were studied under the surfactants dioctadecyl dimethylammonium bromide (DODA), octadecyl amine (ODA) and tetrahexadecyl ammonium bromide. A transition from liquid-expanded to liquid-condensed...

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Bibliographic Details
Published in:Thin solid films Vol. 497; no. 1-2; pp. 259 - 266
Main Authors: Bagkar, Nitin, Betty, C.A., Hassan, P.A., Kahali, K., Bellare, J.R., Yakhmi, J.V.
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 21-02-2006
Elsevier Science
Subjects:
Analytical chemistry
Chemistry
Cross-disciplinary physics: materials science; rheology
Electrochemical methods
Exact sciences and technology
Impedance measurements
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nickel hexacyanoferrate
Physics
Potassium ion sensing
Nickel hexacyanoferrate
Impedance measurements
Potassium ion sensing
Organometallic compounds
Experimental study
Cyano complex
Cyclic voltammetry
Multilayers
Nickel complexes
Self-assembly
Langmuir-Blodgett films
Adsorption
Aqueous solutions
Crystal growth from solutions
Impedance
Nanostructured materials
Nanocrystal
Equivalent circuits
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Summary:Pressure-area isotherms of hexametaphosphate (HMP) stabilized nickel hexacyanoferrate (NiHCF) nanocrystals were studied under the surfactants dioctadecyl dimethylammonium bromide (DODA), octadecyl amine (ODA) and tetrahexadecyl ammonium bromide. A transition from liquid-expanded to liquid-condensed phase is observed for NiHCF under DODA and ODA. The higher stability is observed for the monolayer of NiHCF under DODA. Ultrathin films of NiHCF were prepared by multiple adsorption of sodium-HMP stabilized nickel hexacyanoferrate nanocrystals under a monolayer of DODA. Its electrochemical properties were analysed by cyclic voltammetry and AC impedance spectroscopy. The successive transfer of HMP-stabilized NiHCF–DODA layers was demonstrated by increase in the current measured by cyclic voltammetry as well as the decrease in the capacitance measured with increasing number of layers. The voltammetric response and capacitance response of the film with change in the potential and varying potassium ion concentration (from 0.0001 M to 1.5 M) was also demonstrated.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2005.11.002