Study on Arrayed Potassium Sensors Based on Sputtering TiO2 Thin Film.

• Main Authors: Chang-Yeh Wu, 吳昶燁
• Other Authors: Jyh-Ling Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/50507378420681173502

碩士 === 華梵大學 === 電子工程學系碩士班 === 97 === In this thesis, sputter technology was used to deposit titanium oxide (TiO2) membrane on Indium tin oxide (ITO/glass) substrate to fabricate pH sensors and Potentiometric potassium sensors. The sensitivity was between 42.51 and 52.5 mV/pH when the buffer solution was between pH2 and pH12, providing good linearity and sensitivity. The potentiometric potassium sensors on TiO2/ITO were fabricated by Poly (vinyl chloride) carboxylated (PVC-COOH), plasticizer Bis (2-ethylhexyl) sebacate (DOS), Potassium Ionophore Valinomycin and K-TpClPB. After six repeated measurements, detection limit was 1×10-6M ,the sensitivity is about 49.76mV/decade for the potassium solutions ranging from 1M to 1×10-6M. The advantage of arrayed-sensors is to enhance signal to noise ratio (S/N) and have high accuracy because of eliminating unreasonable values with read-out circuit. In this study 1×4 linear arrays was prepared to detect potassium using parallel-measurement, the corresponding sensitivity is between 50 and 51.8mV/decade. The Hysteresis and drift of arrayed-sensor were better than that of single-sensor. Otherwise the 1×4 arrayed-sensor used parallel measurement comparing with 1×4 arrayed-sensor used average measurement have more stable output voltage and promote hysteresis.