Details

Autor(en) / Beteiligte

• Zhao, Chengjiu
• Guo, Xuezheng
• Ding, Yanqiao
• Liang, Chengyao
• Du, Bingsheng
• Niu, Wen
• Qu, Weijie
• Shi, Yijie
• Cong, Shuren
• Meng, Gang
• He, Yong

Titel

2D/0D SnSe2/TiO2 nanocomposites for trace NO2 detection under H2S interference at room temperature

Ist Teil von

• Sensors and actuators. B, Chemical, 2023-10, Vol.393, p.134291, Article 134291

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Complex gas environments and the demand for room temperature detection will provide challenges for chemo-resistive-type gas sensors in a variety of applications. In this work, 2D/0D SnSe2/TiO2 composite is used as a sensing material, displaying good sensitivity and specificity to ppb-level NO2 at ambient temperature (25 °C). The response value and time of the SnSe2/TiO2 sensor are 207 % and 139s when exposed to 100 ppb NO2, as opposed to 62 % and 183s for the pristine SnSe2 sensor. The composite sensor also offers great long-term stability for NO2 and good gas selectivity. Notably, the SnSe2/TiO2 sensor's mixed gases (NO2+H2S) measurement is done to examine its NO2 detection capacity in the presence of interfering gas. The constructed composite sensor can accurately detect NO2 even if the concentration of the reductive interfering H2S is 66.7 times higher than that of the oxidative target NO2. The effective usage of SnSe2 modified by TiO2 for low-concentration, room-temperature NO2 detection in a complex gas environment is shown by the composite sensor's pleasing gas detection results. •2D/0D SnSe2/TiO2 hybrids are obtained by hydrothermal and ultrasonic methods.•SnSe2/TiO2 can detect low concentrations of NO2 at room temperature.•SnSe2/TiO2 exhibits higher NO2 gas response than SnSe2 (∼3.3 times).•SnSe2/TiO2 can accurately and qualitatively identify NO2 under the interference of high concentrations of H2S.