Journal
ANALYST
Volume 146, Issue 12, Pages 4042-4048Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1an00424g
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Funding
- National Key R&D Program of China [2016YFA0200800, 2020YFB2008603]
- NSF of China [61804156, 61974155, 61527818, 61874130, 62071300]
- Key Research Program of Frontier Sciences of Chinese Academy of Sciences [QYZDJ-SSW-JSC001]
- Shanghai Sailing Program [18YF1427800]
- Program of Shanghai Academic Research Leader [19XD1422900]
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This study successfully achieved high-sensitivity resonant-gravimetric detection of ppb-level NO2 gas at room-temperature using two-dimensional porous TiO2 nanosheets. The TiO2-500 degrees C sample exhibited higher sensitivity and adsorption enthalpy than the TiO2-800 degrees C sample, showing great potential for practical applications.
The trace-level detection of harmful NO2 gas at room-temperature is very important for environmental protection and public health. This paper reports the resonant-gravimetric detection of ppb-level NO2 at room-temperature using two-dimensional porous TiO2 nanosheets (PTNSs) as highly active sensing materials. They are synthesized by a facile high-temperature calcination approach based on a graphene oxide self-sacrificial template. The PTNS sample prepared at 500 degrees C (TiO2-500 degrees C) show an anatase structure, while the sample prepared at 800 degrees C (TiO2-800 degrees C) contains an impurity rutile phase. By loading pure anatase PTNSs onto resonant microcantilevers, the sensors exhibit high sensitivity to NO2 gas with a limit of detection as low as 15 ppb. Compared with the TiO2-800 degrees C sample, the much higher sensitivity of the TiO2-500 degrees C sample can be attributed to the bigger adsorption enthalpy (-Delta H degrees) of pure anatase TiO2 to NO2 gas molecules (21.7 and 57.8 kJ mol(-1), respectively). Density functional theory calculations further demonstrate that the existence of the rutile impurity phase in the TiO2-800 degrees C sample results in its significantly decreased adsorption activity to NO2. This work approves the great application potential of anatase PTNSs for the highly sensitive resonant-gravimetric detection of NO2 gas at room-temperature.
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