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Chemical Sensors: Fundamentals of Sensing Materials Volume 1: General Approaches by Ghenadii Korotcenkov

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CHAPTER 5

MODIFICATION OF SENSING MATERIALS

METAL OXIDE MATERIALS ENGINEERING

G. Korotcenkov

1. INTRODUCTION

As we have seen in other chapters, modern applications of solid-state gas sensors still face problems of high cross-sensitivity to gases (i.e., low selectivity), high sensitivity to the humidity of the ambient atmosphere, long-term drift related to oxygen bulk diffusion, and transformation of the crystal structure of polycrystalline materials (Morrison 1986; Gopel and Scherbaum 1995; Meixner and Lampe 1996). Poor selectivity toward the monitored gas or cross-sensitivity with other gases may make a sensor’s output unreliable. Also, both aging and poor stability may cause a sensor’s calibration curve to drift with time (Wang et al. 1998). ...

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