Application of Cu-modified Dendritic Gold in Nitrite Detection by Electrochemical Method

• Main Authors: CHEN, YU MEI, 陳玉美
• Other Authors: LAI, YING HUANG
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/rx4ugs

碩士 === 東海大學 === 化學系 === 106 === The deposited Au dendrites on the GC electrode shows a three-fold symmetric structure and is composed of trunks, branches and nanorod leaves. And the Au structure grows all along the <111> direction. This kind of composition contains a large number of tips and edges in nanoscale, not only provides a large electrochemical active surface (EASA) but also has excellent structure stability. Calculation of EASA though Cyclic Voltammetry (CV), then modify Cu atom on Au dendrites by under potential deposition (UPD). Use these substrates in Differential Pulse Voltammetry (DPV) for nitrite ion detection to get a linear relationship between current density and nitrite concertation in order to quantify nitrite ion. The linear range of nitrite ion to current density by Au dendrites from 9.09×106 M to1.64×103 M，R2＝0.974. Cu-modified Au dendrites have larger current density in nitrite measurement than Au dendrites and its limit of detection achieve 3.23×10-8 M, R2 = 0.995. Although Cu-modified Au dendrites has prior current density in DPV, Au dendrites can be used for serval times in DPV measurement. Both of these substrates are successful for nitrite ion detection and have different advantages. Our work consist to reported articles, even has lower detect limit.