IMIDAZOLIUM-BASED IONIC LIQUID FUNCTIONAL MATERIALS AND THEIR APPLICATION TO ELECTROANALYTICAL CHEMISTRY - Electrochemical Nanofabrication: Principles and Applications - page 158

The partition coefficient and diffusion coefficient of HQ in the PFIL
film were calculated to be 0.346 and 4.74

×

, respectively.
Electrochemistry in PFIL is similar to electrochemistry in a solution
of traditional supporting electrolytes in the solution, except that the
electrochemical reaction takes place in a thin film on the surface of
the electrode. PFIL is easy to be immobilized on solid substrates,
inexpensive and electrochemically stable. A PFIL-modified electrode
assembly is successfully used in flow analysis at HQ by amperometric
detection in solution without supporting electrolyte. Similarly,
polypyrrole could be electropolymerized on PFIL-PSS modified
electrodes without added support electrolytes [54].

10

- 6

cm

2

s

- 1

(a)

(b) (c)

Figure 4.12 Illustration of the electrochemical process of the analytes

at the PFIL-modified electrode assembly in a supporting electrolyte-free
solution (a); amperometric responses of repeated injection of a 20 M HQ

solution (b); amperometric response of HQ at different concentrations.
The signal was recorded at the 1.4 mm-thick PFIL-modified electrode
assembly at +0.3 V. Double-distilled water was used as the carrier solution.
Flow rate: 1 mL min

m

-

(c) [53]. Reproduced by permission of The Royal

1

Society of Chemistry.