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Development of dissolved CO_2 sensor for sea-water using ion conducting glass-based transducer

使用离子导电玻璃传感器开发海水溶解CO_2传感器

基本信息

批准号：
17550134
负责人：
MATAYOSHI Naoko
金额：
$ 2.3万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

Potentiometric dissolved CO_2 sensor was explored based on ion conducting glass which has ionic conductivity and water-resistance. Li_3Zr_2Si_2PO_<12> (Li^+ion conductor) was prepared by a sol-gel method. The gel was calcined in the range from 500℃ to 1000℃ and pressed into discs in the range from 400Kg/cm^2 to 600 Kg/cm^2. By XRD measurement, the halo patterns due to amorphous state were observed in the calcined samples below 650℃, and the peaks due to ZrO_2 or SiO were observed in the calcined samples above 650℃. FT-IR spectrum of the calcined sample at 1000℃ was different from those of the other samples. Ionic conductivity at room temperature of the calcined samples at 500℃ and 650℃ were ca. 10^<-7> S・cm^<-1> and ca.10^<-6> S・cm^<-1>, respectively. The calcined sample at 1000℃ was not ionic conductor. It was shown that the pressed disc at 550 Kg/cm^2 of the calcined sample at 650℃ has the best water-resistance of the other discs by measurement of the weight-loss of the disc after immersed in water for several weeks. Sensor elements were obtained by combining the discs with an auxiliary phase of metal carbonates. The EMF was found to follow the Nernst's equation of dissolved CO_2 in the range of 87-1308 ppm in phosphate buffer solution (pH 7.0) at 30℃. The observed Nernst slope by using of the pressed disc at 400 Kg/cm^2 of the calcined sample at 500℃ indicated n=4. On the other hand, the observed slopes by using of the pressed disc at 550Kg/cm^2 of the calcined sample at 650℃ indicated n=4-2. Further experiments, which apply to sea-water, will be made in the future.

利用离子导电玻璃的离子导电性和阻水性，研制了电位型溶解CO_2传感器。采用<12>溶胶-凝胶法制备了Li_3Zr_2Si_2PO_（Li^+）离子导体。将凝胶在500℃至1000℃范围内煅烧，并在400 Kg/cm ^2至600 Kg/cm ^2范围内压制成圆盘。XRD测试表明，在650℃以下煅烧的样品中出现了非晶态的晕峰，而在650℃以上煅烧的样品中出现了ZrO_2或SiO的衍射峰。1000℃煅烧样品的红外光谱与其它样品的红外光谱有所不同。500℃和650℃焙烧样品的室温离子电导率约为0.015。10^<-7>S·cm^<-1>和约10 ^<-6>S·cm <-1>^。1000℃焙烧的样品不是离子导体。通过测定650℃煅烧样品在水中浸泡数周后的失重，发现在550 Kg/cm ^2下压制的样品具有最好的耐水性。通过将盘与金属碳酸盐的辅助相结合来获得传感器元件。在pH 7.0的磷酸盐缓冲溶液中，30℃时，溶解CO_2在87-1308 ppm范围内，电动势符合能斯特方程。通过使用压盘以400 Kg/cm ^2在500℃下煅烧的样品观察到的能斯特斜率表明n=4。另一方面，通过使用在650℃下煅烧的样品的550 Kg/cm ^2的压盘观察到的斜率表明n=4-2。今后将进行适用于海水的进一步实验。