High dielectric constant PrY(x)O(y) sensing films electrolyte-insulator-semiconductor pH-sensor for the detection of urea.
In this paper, we describe the structural and sensing properties of high-k PrY(x)O(y) sensing films deposited on Si substrates through reactive co-sputtering. Secondary ion mass spectrometry and atomic force microscopy were employed to analyze the compositional and morphological features of these films after annealing at various temperatures. The electrolyte-insulator-semiconductor (EIS) device incorporating a PrY(x)O(y) sensing membrane that had been annealed at 800 degrees C exhibited good sensing characteristics, including a high sensitivity (59.07 mV pH(-1) in solutions from pH 2 to 12), a low hysteresis voltage (2.4 mV in the pH loop 7-->4-->7-->10-->7), and a small drift rate (0.62 mV h(-1) in the buffer solution at pH 7). The PrY(x)O(y) EIS device also showed a high selective response towards H(+). This improvement can be attributed to the small number of crystal defects and the large surface roughness. In addition, the enzymatic EIS-based urea biosensor incorporating a high-k PrY(x)O(y) sensing film annealed at 800 degrees C allowed the potentiometric analysis of urea, at concentrations ranging from 1 to 16 mM, with a sensitivity of 9.59 mV mM(-1).
Wu
Min-Hsien
MH
Graduate Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan 333, Taiwan, ROC.
Lee
Cheng-Da
CD
Pan
Tung-Ming
TM
D015374:Biosensing Techniques / Q000379:methods*; D004573:Electrolytes / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D011199:Potentiometry; D011221:Praseodymium / Q000737:chemistry*; D012666:Semiconductors / Q000295:instrumentation*; D014508:Urea / Q000032:analysis*; D015018:Ytterbium / Q000737:chemistry*
D004573:Electrolytes; D014508:Urea; D015018:Ytterbium; D011221:Praseodymium