Ligand-modified Multi-walled Carbon Nanotubes for Potentiometric Detection of Silver

Abstract

Three novel hybrid materials have been synthesized by ligands: N- and N-furan-2-ylmethylene-benzene-1,2-dimine (OBD), covalently linking to multi-walled carbon nanotubes (MWCNTs). These MWCNT hybrid materials were used both as ionophores and as ion-to-electron transducers to construct Ag + carbon paste electrodes. The resulting electrodes show higher selectivity to Ag + than other cations tested. Among the three electrodes, the electrode based on SBD-g-MWCNTs with optimum composition shows the best performance to Ag + . It exhibits an excellent Nernstian response to Ag + in the concentration range from 8.8 × 10 -8 to 1.0 × 10 -1 M with a detection limit of 6.3 × 10 -8 M, and it can also be used over a wide pH range of 3.0 -8.0 with a quick response time of 5 s. The response mechanism of the proposed electrode was also investigated by using AC impedance and UV-vis spectroscopy techniques.

Effect of Ion Identity on Capacitance and Ion-to-Electron Transduction in Ion-Selective Electrodes with Nanographite and Carbon Nanotube Solid Contacts

“…Conducting polymers, − redox-active organometallic complexes, and redox buffers − as well as intercalation compounds have been studied extensively as transducers for solid-contact ISEs, as have redox-inactive materials with large surface areas. Among the latter, carbon materials have been studied the most, such as three-dimensionally ordered macroporous (3DOM) carbon, , colloid-imprinted mesoporous (CIM) carbon, , single-walled carbon nanotubes (SWCNTs), , multiwalled carbon nanotubes (MWCNTs), − graphene, , reduced graphene oxide, , carbon black, , fullerene, carbon nanospheres, carbon nanohorns, and carbon cloth …”

Thermodynamic study of potassium chloride in glycerol–water mixed solvents using electromotive force measurements at (298.2, 303.2 and 310.2)K

“…Potentiometric sensors detect the relationship between the activity of the species and the observed potential response with the two-electrode system comprising an indicator electrode and a reference electrode [8]. Analytical method based on potentiometric detection with ion-selective electrode (ISE) is considered as an advantageous alternative because of its easy construction and preparation, manipulation, good selectivity, fast response, simple instrumentation, wide linear dynamic range, wide range of operation, low detection limit, non-destructive analysis, sensitivity, good precision and low cost [9][10][11].…”

“…In recent years nanomaterials have been gradually introduced into potentiometric sensor preparation [8]. Since their discovery in 1991, carbon nanotubes (CNTs) have been one of the interesting materials because of their physico-chemical properties such as unique and ordered structure, high thermal and electrochemical conductivity, high surface-to-volume ratio, excellent electrocatalytic activity, high mechanical strength, ultra-light weight, chemical performance and their extra ordinary capacity to promote electron transfer between heterogeneous phases [8,9,[12][13][14][15].…”

Determination of Bisphenol A Using an Electrochemical Sensor Based on a Molecularly Imprinted Polymer-Modified Multiwalled Carbon Nanotube Paste Electrode

“…MWCNTs have been introduced as excellent materials for the construction of electrochemical sensors based on glassy carbon electrode (X. J. Zhang et al 2012), gold electrode (Hua et al 2011), and carbon paste electrodes (Mokhtari et al 2012;Yang et al 2012). Researchers have reported some papers about multiwalled carbon nanotube ELECTROCHEMICAL SENSOR FOR BISPHENOL A 997 paste electrodes without modified MIPs Keyvanfard et al 2013;Taherkhani et al 2012;K.…”