کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11016360 | 1777900 | 2019 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
LaF3 electrolyte-insulator-semiconductor sensor for detecting fluoride ions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Electrolyte-insulator-semiconductor (EIS) sensor is commonly considered for chemical and biosensing applications due to its small size and simple fabrication method. Here, we demonstrate a fluoride-sensitive EIS sensor using thermally-deposited polycrystalline lanthanum fluoride (poly LaF3) film as sensing membrane, which is cheaper than single-crystal LaF3. The sensing characteristics are analyzed for poly LaF3 layers deposited at different temperatures, and the EIS sensors with the sensing membrane formed at 500â°C exhibit excellent sensing response to fluoride ions with a high sensitivity of 52.3âmV/pF and low limit of detection of 1.9âppb. This limit of detection is lower than previously reported values in the literatures. In addition, the poly LaF3 film deposited at 500â°C has good stability with a low hysteresis voltage of 5.1âmV and a small drift rate of 0.67âmV/h. These superior metrics come from a rather well crystallized LaF3 structure including denser surface grains, enhanced preferential crystalline (002) plane, and improved stoichiometric composition. Furthermore, the sensors show a good selectivity over other ions such as NO3â and SO42â.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 279, 15 January 2019, Pages 183-188
Journal: Sensors and Actuators B: Chemical - Volume 279, 15 January 2019, Pages 183-188
نویسندگان
Hyeonsu Cho, Kihyun Kim, M. Meyyappan, Chang-Ki Baek,