Hydrothermal Synthesis of Nanocrystalline SnO2 for Gas Sensorsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 декабря 2013 г.
Аннотация:Abstract—Nanocrystalline SnO2 is prepared by hydrothermal synthesis (130–250
°C, 2–5 h) using three different
precursors and is characterized by x-ray diffraction, transmission electron microscopy, and nitrogen
BET measurements. The crystallite size of SnO2 powders (d = 4–5 nm) prepared from amorphous stannic
acid gels is found to vary very little with process temperature and duration. Air anneals at 500
°C for 1–20 h
demonstrate that the highest stability toward crystallite growth is offered by the samples prepared by oxidizing
SnSO4 with H2O2 (the crystallite size increases only slightly, from 4–5 to 5–7 nm), whereas the crystallite
size of the samples prepared by high-temperature hydrolysis of SnCl4 increases markedly, from 4–5 to
16
-17 nm. Nanocrystalline NiO-doped SnO2 is prepared by hydrothermal treatment, and its physicochemical
properties are investigated. Both SnO2 and SnO2
á
NiO
ñ exhibit gas sensitivity, as demonstrated by consecutively
exposing the samples to different gaseous atmospheres: O2 N2
O2
and O2 N2 +
C2H5OH O2 .