Novel sensor for simultaneous determination of K+ and Na+ using Prussian blue pencil graphite electrode

Ang, Jin Qiang; Li, Sam Fong Yau

doi:10.1016/j.snb.2012.07.119

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…In addition, it is known that sodium ions can cause electrochemical response of PB . As shown in Figure S3A in the Supporting Information, the cyclic voltammetric response of the unmodified PB in 0.1 M blank Tris buffer solution (pH 7.4) was small, whereas after adding 5 mM sodium ions, the cyclic voltammetric response of the unmodified PB was increased.…”

Section: Resultsmentioning

confidence: 99%

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Ion Permeability of Polydopamine Films Revealed Using a Prussian Blue-Based Electrochemical Method

Gao

Tong

et al. 2014

J. Phys. Chem. B

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Polydopamine (PDA) is fast becoming a popular surface modification technique. Detailed understanding of the ion permeability properties of PDA films will improve their applications. Herein, we report for the first time the thickness-independent ion permeability of PDA films using a Prussian blue (PB)-based electrochemical method. In this method, PDA films are deposited via ammonium persulfate-induced dopamine polymerization onto a PB electrode. The ion permeability of the PDA films can thus be detected by observing the changes in electrochemical behaviors of the PB coated by PDA films. On the basis of this method, it was unexpectedly found that the PDA films with thickness greater than 45 nm (e.g., ~60 and ~113 nm) can exhibit pH-switchable but thickness-insensitive permeability to monovalent cations such as potassium and sodium ions. These observations clearly indicate the presence of a continuous network of interconnected intermolecular voids within PDA films, regardless of film thickness.

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Section: Resultsmentioning

confidence: 99%

“…On the other hand, the ionic size of a K + ion (ca. 2.5 Å in hydrated ion diameter) 29 is significantly smaller than that of Fe(CN) 6 3− (ca. 6.0 Å in hydrated ion diameter) and of Ru(NH 3 ) 6 3+ (ca.…”

Section: ■ Experimental Sectionmentioning

confidence: 85%

Ion Permeability of Polydopamine Films Revealed Using a Prussian Blue-Based Electrochemical Method

Gao

Tong

et al. 2014

J. Phys. Chem. B

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“…In order to maintain a constant electroactive surface area the pencil holder is kept in upright position and always a constant length of the pencil rod is introduced in the solution to be analysed [ 10 , 11 , 21 , 24 , 25 , 43 – 45 , 49 – 61 ]. Other authors reported the direct connection of the PGE to the potentiostat cable [ 62 ] or the mounting of the PGE on an improvised electrode clip [ 63 ]. One paper describes the sealing with epoxy of the graphite lead into a syringe acting as holder.…”

Section: Discussionmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) provided information on impedance changes at the electrode surface and therefore on the appearance of surface modifications enabling thus the differentiation between unmodified and modified electrodes [ 3 , 54 , 60 , 61 , 104 , 119 , 127 , 140 , 149 , 161 , 170 , 173 , 182 , 198 , 205 , 210 , 216 ], while CV is useful to characterize an electrode from electrochemical point of view or to investigate the electroactivity of conducting polymers, providing information about the formation, the potential, and the anodic/cathodic peak potentials of the polymer [ 3 , 15 , 24 , 28 , 32 , 43 , 54 , 60 – 63 , 66 , 67 , 72 , 104 , 111 , 114 , 117 , 118 , 120 – 122 , 125 , 127 , 135 , 140 , 144 , 145 , 149 , 152 , 158 , 161 , 168 , 170 , 175 , 177 , 181 , 183 , 192 , 193 , 203 – 205 , 208 , 210 ].…”

Section: Discussionmentioning

confidence: 99%

Pencil Graphite Electrodes: A Versatile Tool in Electroanalysis

David

Popa

Buleandră

2017

Journal of Analytical Methods in Chemistry

203

106

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Due to their electrochemical and economical characteristics, pencil graphite electrodes (PGEs) gained in recent years a large applicability to the analysis of various types of inorganic and organic compounds from very different matrices. The electrode material of this type of working electrodes is constituted by the well-known and easy commercially available graphite pencil leads. Thus, PGEs are cheap and user-friendly and can be employed as disposable electrodes avoiding the time-consuming step of solid electrodes surface cleaning between measurements. When compared to other working electrodes PGEs present lower background currents, higher sensitivity, good reproducibility, and an adjustable electroactive surface area, permitting the analysis of low concentrations and small sample volumes without any deposition/preconcentration step. Therefore, this paper presents a detailed overview of the PGEs characteristics, designs and applications of bare, and electrochemically pretreated and chemically modified PGEs along with the corresponding performance characteristics like linear range and detection limit. Techniques used for bare or modified PGEs surface characterization are also reviewed.

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Prussian Blue Analogues: A Versatile Framework for Solid‐Contact Ion‐Selective Electrodes with Tunable Potentials

2017

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The development of solid‐contact ion‐selective electrodes (SC‐ISEs) (e. g. for point‐of‐care sensors) requires simple inner reference electrodes (iREs) with predictable and reproducible potentials. Intercalation compounds fulfill these requirements, as they respond to target ions present in the ion‐selective membrane. Their applicability, however, is limited by the availability of intercalation frameworks capable to intercalate the target ion of interest. We report that Prussian Blue analogues (PBAs) can serve as versatile iREs for a range of target ions of clinical interest, such as Na+, K+, or Ca2+. Combining target‐ion intercalated PBAs with ion‐selective membranes results in a family of all‐solid SC‐ISEs, which are capable as ISEs with an inner filling, yet cheap and suitable for mass‐production. The SC‐ISEs′ standard potential is predictable and can be tuned by altering the PBAs′ redox‐active transition metal or by changing its state of charge.

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Novel sensor for simultaneous determination of K+ and Na+ using Prussian blue pencil graphite electrode

Cited by 8 publications

References 18 publications

Ion Permeability of Polydopamine Films Revealed Using a Prussian Blue-Based Electrochemical Method

Ion Permeability of Polydopamine Films Revealed Using a Prussian Blue-Based Electrochemical Method

Pencil Graphite Electrodes: A Versatile Tool in Electroanalysis

Prussian Blue Analogues: A Versatile Framework for Solid‐Contact Ion‐Selective Electrodes with Tunable Potentials

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