
544 Nanosensors: Physical, Chemical, and Biological
The instability of the native surface termination is the major obstruction
prohibiting pervasive applications of PS in the sensor eld. Massera et al.
(2004) found that the electrical performance of a PS NO
2
gas sensor was
greatly improved by stabilizing its surface with long-standing exposure to
high NO
2
concentrations prior to usage.
PS is sometimes used as a large surface area substrate on which NPs are
deposited. How is a PS-based hydrogen gas sensor made? Luongo et al. (2005)
developed a hydrogen sensor in which the sensing part consists of NPs of
Pd deposited on a P-type si ...