製成新型高靈敏的銅離子感測器利用循環伏安法(cyclic voltammetry)將calix[4]arenes帶有苯甲醯基或硝基苯偶氮基團等化合物電鍍在金電極上。利用掃描式電子顯微鏡和電化學阻抗頻譜來觀察感測膜的表面結構。利用差式脈衝伏安法(differential pulse voltammetry)來探討不同的掃描週期，緩衝溶液的pH值及calix[4]arenes上的取代基等因素對測量銅離子感度影響。在以calix[4]arenes帶有硝基苯偶氮基團所製成的銅離子感測器具有良好的感度、選擇性佳、有可接受的感應線性、低的偵測極限和長期穩定度佳等特性。
Electrical and humidity sensing properties of K+-nano-mica film
An impedance-type humidity sensor was made using K+-nano-mica film. Complex impedance spectra were obtained to analyze the humidity sensing and electrical properties of the humidity sensor. The sensor had a high sensitivity and its sensing-linearity depended on the applied frequency. The temperature dependence between 15 and 35℃ was from −0.1% RH/℃to −0.67% RH/℃ at 20–90% RH, respectively. The sensor exhibited a small hysteresis, a fast response time and good long-term stability. The different complex impedance plots obtained at low and high relative humidity indicated that the ions dominate the conductance of the K+-nano-mica film.
Determination of Copper(II) ion using Diazo-modified Au electrode
Novel sensitive electrochemical Cu(II) ion sensor were made by electrochemical coating functionalized calix[4]arenes with benzoyloxy or nitrophenylazo groups on Au electrode on quartz crystal substrate using cyclic voltammetry (CV). The Cu(II) ion-sensing film thus prepared was characterized by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The response current of the prepared electrochemical Cu(II) ion sensors was measured by differential pulse voltammetry (DPV). The effects of the substituent on calix[4]arene, sweep cycles and pH of buffer solution on the Cu(II) ion sensing properties (response) of the sensors were investigated to reveal the optimal conditions in the detection of Cu(II) ion in water. The electrochemical Cu(II) ion sensor that was made of the calix[4]arene functionalized with nitrophenylazo groups exhibited a excellent response, good selectivity, acceptable linearity, a low detection limit and favorable long-term stability.
