Self-assembled monolayers from symmetrical di-thiols: Preparation, characterization and application for the assembly of electrochemically active films

Electrocatalytic Sensor for Hydrogen Peroxide Based on Immobilized Benzoquinone

“…The peak values of the anodic and cathodic currents are observed at + 0.19 V and + 0.17 V respectively, this is close to literature data [24]. The surface concentration of BQ calculated from integration of the anodic and cathodic peaks (Figure 2) for a twoelectron redox process is 2.2 � 0.6 × 10 À 6 mol • m À 2 , this value is close to that reported in [23] and corresponds to the modification of~60 % of SAM molecules [23].…”

“…Self-assembled monolayer of 1,3-dimercaptopropan-2-ol (left) was used as an anchor layer for immobilization of benzoquinone moieties (right). Adapted from [23].…”

“…For the oxidation of hydrogen peroxide the value z = 2 is expected. The value of Γ is equal to 1.5 × 10 18 molecules/m 2 [23]. The value of current at 3 mM is equal to 49 μA.…”

“…To achieve a high stability of thin self-assembled monolayers, compounds with multiple thiol groups are used, for example thioctic acid [20][21][22]. Recently, we have suggested another anchor site, a symmetrically substituted dithiol [23]. Notably, a monolayer from this compound decreases the electron transfer from/to ferro/ferricyanide only for 57 %.…”

“…Here we apply this compound for the development of electrocatalytic sensor for hydrogen peroxide. According to our best knowledge, this is the first report on electrocatalytic activity of BQ in oxidation of hydrogen peroxide.It was achieved by immobilization of 1,4-benzoquinone (BQ) on the electrode surface [23][24][25][26].…”