posted on 2020-11-04, 21:14authored byKyusung Kim, Pil gyu Choi, Toshio Itoh, Yoshitake Masuda
The
development of a facile gas sensor for the ppb-level detection
of acetone is required for realizing health diagnosis systems that
utilize human breath. Controlling the crystal facet of a nanomaterial
is an effective strategy to fabricate a high-response gas sensor without
a novel metal catalyst. Herein, we successfully synthesized a SnO2 nanosheet structure, with mainly exposed (101) crystal facets,
using a SnF2 aqueous solution at 90 °C. The SnO2 nanosheets obtained after various synthesis durations (2,
6, and 24 h) were investigated. The sample synthesized for 6 h (NS-6)
exhibited a 10-fold higher response (Ra/Rg = 10.4) for 1 ppm of acetone compared
to the other samples, where Ra and Rg are the electrical resistances under air and
the target gas. Furthermore, NS-6 detected up to 200 ppb of acetone
(response = 3). In this study, we attributed the high response (of
low concentrations of acetone) to the (101) crystal facet, which is
the main reaction surface. The (101) crystal facet allows the facile
formation of a depletion layer due to the highly reactive Sn2+. Additionally, the acetone adsorption energy of the (101) crystal
facet is relatively lower than that of other crystal facets. Owing
to these factors, our pristine SnO2 nanosheet gas sensor
exhibited significantly high sensitivity to ppb levels of acetone.