Electroactive Organic-Inorganic Layered Perovskite Hybrids: Steric Interaction between Aminopyridine and Trivalent Ferricyanide and Use for Electrochemical Sensing Device

摘要

Steady organic-inorganic perovskite hybrids with (H22-Ap)3/2Fe(CN)6, (H_23-Ap)_3/2Fe(CN)_6 and (H_24-AP)_3/2Fe(CN)_6 (2-AP = 2-aminopyridine, 3-AP = 3- aminopyridine, 4-AP = 4- aminopyridine) were formed from aqueous solution. Each structure was an unusual layered organic-inorganic structural type. A device was designed to construct electrochemical sensing devices using above organic-inorganic perovskite hybrids. The sequence of redox activity is (H24-Ap)3/2Fe(CN)6 > (H22-Ap)3/2Fe(CN)6 > (H_23-AP)_3/2Fe(CN)_6 and that of electrocatalytical activity is (H_22-Ap)_3/2Fe(CN)_6 > (H_23-Ap)_3/_2Fe(CN)6 > (H24-AP)_3/_2Fe(CN)_6. The variation coefficients (RSD) of successive and interval assays are less than 2.0%. Three electrochemical sensing devices display a remarkable electrochemical sensitivity and stability.