Studies of Modified Titanium oxide Electrodes

• Main Authors: Chi-Chum Yang, 楊啟全
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/nq86x6

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 94 === The paper relates to a process for producing a metal probe tip having a sharp point. A computer controlled instrument and reversed dip etching process characterizes the tip while in formation and reliably produces tips having a radius of curvature of approximately 10μm. In the paper, the position of the metal wire during the reversed-dip-etching operation is mechanically controlled while the etching solution is monitored. A new pH sensor based on a novel oxidized titanium electrode is prepared and its characteristics discussed as well. Titanium electrodes were anodized in DMSO organic solution by applying DC voltages (6V~160V) to form various titanium oxide thin films. The dry (stored in dry air) anodized titanium electrode has a super-Nernstian response with a slope of 66.0 mV/pH unit, and the wet (stored in 4M KCl solution) anodized titanium electrode has a near Nernstian response with a slope of 59.0 mV/pH unit. Responses over a pH range 2 ~ 12 are linear. A self-assembled Prussian blue (PB) on titanium microelectrode with modified Nafion is described. The modified electrode showed high sensitivity when used in the determination of potassium ion concentration. It can effectively eliminate the interference of H+ ion after coated PB with modified Nafion. This electrode can be used in the determination of the time since death (postmortem interval, PMI).