A New Detector for Gaseous Components Using Semiconductive Thin Films.

Gas sensing properties of defect-controlled ZnO-nanowire gas sensor

“…Gas sensitivity was found to be linearly proportional to the photoluminescence intensity of oxygen-vacancy-related defects in both as-fabricated and defect-controlled gas sensors by postannealing in Ar and H 2 atmosphere. This result agrees well with previous theoretical prediction that oxygen vacancies play a role of preferential adsorption sites for NO 2 Ever since Seiyama et al 1 discovered that the electrical conductivity of ZnO could be dramatically changed by the presence of reactive gases in the air, there have been tremendous reports on the applications of metal-oxide semiconductors as gas sensors. In the early stage, metal-oxidesemiconductor gas sensors have been usually fabricated in the form of thin films, in which nanosized powders are screen printed on prepatterned electrodes, followed by firing at high temperature.…”

DNA-decorated graphene chemical sensors

“…After functionalization with ssDNA, the hole, and electron mobilities decreased to 1600 cm 2 / V s and 750 cm 2 / V s, respectively, indicating slightly increased carrier scattering due to ssDNA on the graphene surface. 13 The doped charge carrier density with the ssDNA layer was 1.4ϫ 10 12 / cm 2 .…”

SnOx Nanocrystallites Supported by Silica Nanostructures

“…If this approach can be extended to other metal oxides such as TiO 2 , it may be possible to considerably improve metal oxide photocatalysts. 20,21 Further, we note that this synthesis mode is, within itself, environmentally benign.…”