Emerging Nanotechnologies for Manufacturing, 2nd Edition

40 CHAPTER 2 Gas phase nanofication

As can be seen from Figure 2.23, surface modication by the proposed scheme

has certainly brought about marked changes in the behaviour of a WO

3

-based CO

sensor. The sensor could be operated in a cyclic fashion without compromising the

signal, with a concomitant enhancement in sensitivity and signicant shortening of

the response time. In order to examine if such exotic microstructural features could

be developed in bulk oxides, WO

3

thick lms formed by heating the slurry at 600°C

for 1 h in air were subjected to reduction in a H

2

/N

2

mixture at 600°C for 30 min,

cooled to room temperature and again heated in ...