本篇論文為染料分子感測鈷離子的研究，我們選用三種不同表面積的二氧化鈦當作固態基材，讓染料分子吸附其上，再利用二甲酚橙鈉鹽染料分子和鈷離子的作用所導致的可見光吸收光譜改變來偵測鈷離子濃度。因二甲酚橙鈉鹽/TiO2薄膜的可見光吸收強度在不同pH值下具有很強的顏色緩衝能力，所以二甲酚橙鈉鹽/TiO2薄膜感測器在感測離子時，不需使用到酸鹼緩衝溶液，這項特點增加感測離子時的方便性。我們的結果顯示具中孔洞結構的TiO2，由於表面積較大，吸附較多的二甲酚橙鈉鹽染料分子，對鈷離子的偵測靈敏度最佳，以肉眼觀察顏色變化，鈷離子濃度的偵測極限值約為2x10-4M(12ppm)。利用可見光吸收光譜的改變，則偵測極限可降低至10-5M(0.6ppm)。我們利用傅氏轉換紅外光光譜分析二甲酚橙鈉鹽/二氧化鈦和鈷離子的鍵結情形。研究結果顯示鈷離子對二甲酚橙鈉鹽振動的影響主要發生在N(CH2)3、OH和苯環上，這也反映鈷離子可能和二甲酚橙鈉鹽分子鍵結的位置。

This thesis is related to the detection of cobalt ions using solid state sensors. Three different TiO2 substrates with chemically-adsorbed xylenol orange tetrasodium salt (XO) are used as sensors. The detection of cobalt ions is based on the change in visible absorptions. The visible absorption of XO/TiO2 is not sensitive to pH change, so there is no need to use buffer solutions in the cobalt ions detection. Mesoporous TiO2 is found to have the best sensitivity to cobalt ions among the three different TiO2 samples, owing to its higher surface area. Using the XO/mesoporous TiO2 as a sensor, the cobalt ions detection limit are 2X10-4M(12ppm) based on the color change observed by naked eyes. It is decreased down to 10-5M(0.6ppm) with spectrophotometric change. Fourier transform infrared spectroscopy is employed to investigate the bonding of cobalt ions on XO/TiO2 . It is found that the vibrational motions of N(CH2)3 , OH, and benzene rings of XO molecules are largely perturbed . This result may alike reflect the bonding sites of the XO molecules interacting with cobalt ions.

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