| Summary: | 碩士 === 國立中興大學 === 化學系所 === 105 === We present here a simple process to prepare copper-PolyMelamine composite modified screen printed carbon electrode (SPCE*/PolyMel/Cu) for developing as thiol sensor. The electrode involves first polymerization of melamine on an SPCE* (PolyMel-SPCE*) followed by electrodeposition of copper. The Cu-PolyMel-SPCE* was found to have good electrocatalytic activity towards the detection of thiol compounds. Compared to those of Cu-deposited SPCE* (i.e., without PolyMelamine), much better performance was observed at the Cu-PolyMel-SPCE* for the detection of cysteine, homocysteine, cysteamine and thioglycolic acid (TGA). Flow injection analysis was further applied for increasing the detection sensitivity. The detection limit (S/N = 3) was calculated as 4.29, 5.15, 41.33 and 12.55 μM for cysteine, homocysteine, TGA and cysteamine, respectively. A wide linear calibration range from 50 μM to 1.5 mM with a regression coefficient of 0.998 under optimal conditions of detection potential of 0.1 V (vs. Ag/AgCl) and flow rate of 0.8 mL/min was achieved. Also, we can control the amount of Cu deposited on SPCE*/PolyMelamine electrode to selectively detect thiols or amino acids. The same SPCE*/PolyMel was further used for the synthesis of CuI and was demonstrated for use as photo detector.
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