Abstract
Abstract A supercritical carbon dioxide (SCC) assisted process has been developed to synthesize polypyrrole/graphene oxide nanocomposites (PPY/GO) along with control release formulations (CRFs) of poly (N-isopropyl acrylamide) (PNIPAM) and their nanoferrogel (NFG) involving simazine (SZ, 30%, w/w). Working electrodes (WEs) with DC conductivity of 16.58 mS/cm bearing limits (M) of detection of 2.92 × 10−10 and quantification of 9.03 × 10−10 were fabricated from PPY/GO for electroanalysis of SZ released from CRFs in KCl (0.1 M, pH 3.5). Cyclic voltammetry@0.05 to 0.2 V/s in potential ranging −0.2 to −0.7 V reveals enhanced electrochemical response of WEs towards NFG and SZ released from CRFs. Square wave voltammetry in potential ranging from −0.8 to −0.1 V@50 Hz at 200 mV reveals 60% (1.47 × 10−8 M) SZ release from PNIPAM derived CRFs in 6 h. Presence of ferrite nanoparticles has rendered control release of SZ by 45% (1.10 × 10−8 M) in CRFs under identical electrochemical conditions. The present study delivers a SCC assisted clean and dry method of synthesis of PPY/GO derived WEs extending rapid, reproducible and accurate electroanalysis of SZ release from supercritically derived CRFs.
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