Abstract
Acetone is a tracer for monitoring air quality and a potential breath maker for diabetes.It remains a great challenge for current portable sensors to sensitively and selectively detect acetone at low-ppb(parts per billion)level.Herein,we present an ordered mesoporous nickel oxide(NiO)with both large mesopores and ultrathin crystalline frameworks for the detection of low-ppb acetone.The ordered mesoporous NiO replicas with predominant large mesopores of 11 nm,high specific surface areas of 121-128 m2/g and ultrathin crystalline frameworks of 5 nm were synthesized by the nanocasting method and the crystalline properties of NiO frameworks were adjusted by changing the annealing temperature from 300 ℃ to 750 ℃,which resulted in different contents of oxygen deficient on the surface of ultrathin frameworks.The gas-sensing properties for all the NiO samples were investigated and the ordered large-pore mesoporous NiO(NiO-600)with maximum oxygen deficient obtained at 600 ℃ exhibited the highest response(Rgas/Rair-1=2.9)toward acetone(1 ppm,ppm:parts per million),which is 3.4 and 30 times larger than those for common mesoporous NiO obtained at 300 ℃ and bulk NiO.Notably,a low detection limit(2 ppb),good selectivity and cycling stability were also observed in NiO-600.
基金项目
国家自然科学基金(52062043)
国家自然科学基金(U21A2062)
国家自然科学基金(51672138)
Natural Science Foundation of Ningxia Hui Autonomous Region,China(2020AAC03024)
Natural Science Foundation of Ningxia Hui Autonomous Region,China(2022AAC02001)
Ningxia Fostering Program for Innovative Leading Talents in Science and Technology,China(KJT2017003)
NETL
NSTL
万方数据