Study of the pH Sensitivity of a Carbon-Paste Electrode Modified with Li_0.31La_0.56TiO₃-xSrTiO₃

Abstract:

A novel sensitive pH sensor was reported based on a carbon paste electrode modified (CPEM) with perovskite-type Li_0.31La_0.56TiO₃ (LLTO) and LLTO-xSrTiO₃ (x =0.05~ 0.15) in order to investigate the influence of the doping in the sensor response. The carbon paste proves the ability of this perovskite to detect the variation of pH 2 -13. The LLTO-xSrTiO₃ (x =010)-CPEM indicated that the best linear relationships. A variation of potential in different pH-buffers was obtained with a response maximum of 32.08 mV/pH unit at 25 ^◦C and 55.39 mV/pH unit at 70 ^◦C for the better responding electrode.

• Periodical: Advanced Materials Research (Volumes 554-556)
• Pages: 430-435
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.554-556.430
• Online since: July 2012
• Authors: Yue Hua Li, Jing Zhu, Lei Dai, Ling Wang
• Keywords: Carbon-Paste Electrode, Lithium Solid Electrolyte, LLTO, Perovskite, pH Sensor

References

[1] J.G. Webster, The Measurement Instrumentation and Sensors Handbook, CRC Press and IEEE Press, Florida, 1999, p.71.

[2] O.S. Wolfbeis: Analytical Chem. 76 (2004), p.3269

[3] A. Safavi, M. Bagheri: Sens. Actuators B. 90 (2003), p.143

[4] G. Gerlach, M. Guenther, J. Sorber, G. Suchaneck, K.F. Arndt and A. Richter: Sens. Actuators B. 111 (2005), p.555

DOI: 10.1016/j.snb.2005.03.040

[5] P. Shuk, K.V. Ramanujachary and M. GreenBlatt: Solid State Ion. 86/88 (1996), p.1115

[6] K. Pasztor, A. Sekiguchi, N. Shimo, N. Kitamure and H. Masuhara: Sens. Actuators B. 14 (1–3) (1993), p.561.

[7] J. Hendrikse, W. Olthuis and P. Bergveld: Sens. Actuators B. 53 (1–2) (1998), p.97

[8] W. D. Huang, H. Cao, S. Deb, M. Chiao and J.C. Chiao: Sens. Actuators A. 169 (2011) , p.1

[9] L. Bousse, S. Mostarshed and N.F. de Rooij: Sens. Actuators B. 17 (2) (1994), p.157

[10] L. Zeroual, L. Telli: Sens. Actuators B. 25 (1–3) (1995), p.741

[11] Cl. Bohnkea, B. Regrag, F. Le Berre: Solid State Ion. 176 (2005), p.73

[12] M. Roffat, O. Noël, O. Soppera, O. Bohnke: Sens. Actuators B. 138 (2009), p.19

[13] Y. Inaguma, L. Chen, M. Itoh, T. Nakamura: Solid State Ion. 70/71 (1994), p.196

[14] N. Imanaka, G. Adachi: J. Alloy. Comp. 250 (1997), p.492

[15] Q.N. Pham, C. Bohnke, O. Bohnke: Surf. Sci. 572 (2004), p.375–384.

[16] I. Ŝvancara, K. Vytřas, K. Kalcher: Electroanalysis. 21(2009), p.7

[17] B.H. Freitas, F. A. Amaral, N. Bocchi, M. F.S. Teixeira: Electrochim. Acta. 55 (2010), p.5659

[18] H. X. Geng, J. Lan, A. Mei, Y. H. Lin, C.W. Nan : Electrochim. Acta 56 (2011), p.3406

[19] J.L. Fourquet, H. Duroy, M.P. CrosnierLopez: J. Solid State Chem. 127 (1996), p.283

[20] S. Kitaoka, N. Inoue: Solid State Ion. 180 (2009), p.598

[21] J. Xu, A. P. Mills, D. O. Henderson and S. Ishibashi: Phys. Rev. Lett. 83 (1999), p.4586