Studies on physical and antimicrobial characteristics of polypyrrole/hemoglobin composites
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Date
2021-10
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A series of electrodes were prepared for PPY (PPy) and it’s composites with Hb (PHC-1, PHC-2, PHC-3). Electrodes were fabricated using two different binder and solvent combination over stainless steel surface. PVB and THF combination showed best surface morphology. Conductivity for electrodes was measured at room temperature using four probe method, PHC-3 shows the best conductivity result at room temperature. For optimization of electrode different PVB concentration (8 mg, 15 mg, 35 mg, 75 mg) were used in PHC-3. 35 mg PVB in PHC-3 shows the best result for conductivity at room temperature, therefore working electrodes for PPy, PHC-1, PHC-2 and PHC-3 were prepared with 35 mg binder concentration. All prepared electrodes were further tested for physical characterization. Electrodes were kept under humid environment for 8 hrs and were found to be morphologically stable. With increase in amount of Hb in PPy, increase in conductance was observed, PHC-3 shows the best results for conductance. For different PVB concentration conductance increases up to 35 mg PVB in PHC-3 and then decreases with further increase in binder amount. A sharp rise in σDC of WEs was observed at 100 V in each case that attributes to their behaviour as intrinsic semiconductors. All PHCs show linear I/V characterization and their electrical conductivity increases with Hb concentration and applied voltage. Effect of binder on I-V also shows linear variation and conductivity increase with increase in PVB up to 35 mg and then decrease with further increase in PVB amount. However, a sharp rise in σDC of WEs was observed at 100 V that attributes to their behaviour as intrinsic semiconductor. PHCs of concentration 1 mg/mL, 1.5mg/mL and 2 mg/mL were tested against 3 fungi A. niger, P. chrysogenum and T. asperellum, composites show no inhibition capability at tested concentration.