Comparison of different surface modifications of electrode with gold nanoparticles in detection of hydrogen peroxide

• Main Authors: Huang, Chi-Yen, 黃啟彥
• Other Authors: Yuan, Chiun-Jye
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/82092447472431399575

碩士 === 國立交通大學 === 生物科技系所 === 101 === In the food industry, hydrogen peroxide was often used for food bleaching、microbiological control and aseptic packaging. Long-term consumption may cause health damage. To verify the effect of gold nanoparticle modification on screen-printed carbon paste electrode (SPCE) in the detection of hydrogen peroxide (H2O2) SPCE was first functionalized by electrochemical diazotization to deposit a layer of 4-aminophenylacetic acid (CMA) on the surface of SPCE. Subsequently, the gold nanoparticles (AuNPs) or the surface modified AuNPs were coated on top of the CMA layer by either physical absorption or covalent bonding. The capability of the gold nanoparticles-modified SPCE to detect hydrogen peroxide in solution was investigated by cyclic voltammetry and current-time responses. The sensitivity of SPCE, SPCE modified with AuNPs and cysteamine-coated AuNPs to H2O2 was 7.94 x 10-6, 1.41 x 10-5, 1.44 x 10-5 A/cm2/mM. The results showed that the modification of SPCE with gold nanoparticles markedly increased the electrochemical response to H2O2.