Ultrafast CO Sensor Based on Flame-annealed Porous CeO2 Nanosheets for Environmental Application

doi:10.15541/jim20210142

Abstract

Abstract:

As a highly toxic gas, CO is one of the culprits of air pollution. Long-term inhalation will also cause great harm to the human body and even death. How to achieve rapid CO monitoring is an important challenge in sensing field. CO as one of the of air pollution, long time inhalation will reduce the oxygen carrying capacity of blood and in severe cases death. Therefore, effective monitoring of CO is necessary. In this study, porous CeO₂ nanosheets (CeO₂ NSs) were obtained via flame annealing intermediate product CeCO₃OH nanosheets synthesized by simple hydrothermal method. Through controlling of the flame time, oxygen vacancies were introduced into the CeO₂ NSs. As a result, the CeO₂ NSs annealed with 2 min (CeO₂-2min NSs) exhibited outstanding reproducibility and selectivity towards CO gas. Particularly, the response/recovery time were extremely fast (2 s/2 s) towards 500 μL/L CO at 450 ℃ as well as finely functional relationship between response and concentration of CO at a wide detection range (10-10000 μL/L). The superior gas sensing performance of CeO₂-2min NSs can be ascribed to the high aspect ratios of the porous two-dimensional structure and abundant oxygen vacancies in the crystals. This work may supply a strategy for designing ultrafast gas sensors which can detect target gas at a wide range.

Key words: flame annealing, porous CeO₂ nanosheets, oxygen vacancy, gas sensors, wide range

CLC Number:

TQ174

LI Pengpeng, WANG Bing, WANG Yingde. Ultrafast CO Sensor Based on Flame-annealed Porous CeO₂ Nanosheets for Environmental Application[J]. Journal of Inorganic Materials, 2021, 36(11): 1223-1230.

Figures/Tables 14

References 31

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Material	Concentration/(μL∙L^-1)	Temperature/℃	Sensitivity	(Response/recovery time)/s	Ref.
Co₃O₄ nanostructures	5	100	2.4^a	14/36	[23]
Pd/SnO₂	100	100	3.5^a	60/150	[24]
TiO₂-CeO₂ mixed oxides	400	200	10.7^a	32/45	[25]
SnO₂/MoO₂	100	RT	9.2%^b	20/16	[1]
SnO₂-CeO₂ mixed oxides	500	430	190%^b	26/30	[11]
Pd/SnO₂ nanowires	200	400	6.8^a	5/40	[26]
ZnO nanorods	30	400	1.1^a	46/27	[27]
Porous CeO₂ nanosheets	500	450	12.0%^b	2/2	This work

Material	Concentration/(μL∙L^-1)	Temperature/℃	Sensitivity	(Response/recovery time)/s	Ref.
Co₃O₄ nanostructures	5	100	2.4^a	14/36	[23]
Pd/SnO₂	100	100	3.5^a	60/150	[24]
TiO₂-CeO₂ mixed oxides	400	200	10.7^a	32/45	[25]
SnO₂/MoO₂	100	RT	9.2%^b	20/16	[1]
SnO₂-CeO₂ mixed oxides	500	430	190%^b	26/30	[11]
Pd/SnO₂ nanowires	200	400	6.8^a	5/40	[26]
ZnO nanorods	30	400	1.1^a	46/27	[27]
Porous CeO₂ nanosheets	500	450	12.0%^b	2/2	This work

	O_S/%	O_V/%	Ce³⁺/%	Ce³⁺/Ce⁴⁺
CeO₂-0.5min NSs	19.0	40.0	26.3	0.357
CeO₂-2min NSs	14.8	43.2	28.6	0.401
CeO₂-5min NSs	15.1	42.7	23.8	0.312

	O_S/%	O_V/%	Ce³⁺/%	Ce³⁺/Ce⁴⁺
CeO₂-0.5min NSs	19.0	40.0	26.3	0.357
CeO₂-2min NSs	14.8	43.2	28.6	0.401
CeO₂-5min NSs	15.1	42.7	23.8	0.312

	Surface area/(m²∙g^-1)	Pore volume/ (cm³∙g^-1)	Average pore diameter/nm
CeO₂-0.5min NSs	73.344	0.172	10.1
CeO₂-2min NSs	46.804	0.181	15.5
CeO₂-5min NSs	40.836	0.163	15.8

Ultrafast CO Sensor Based on Flame-annealed Porous CeO₂ Nanosheets for Environmental Application

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