首页|Construction of mesoporous silica-implanted tungsten oxides for selective acetone gas sensing
Construction of mesoporous silica-implanted tungsten oxides for selective acetone gas sensing
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维普
As a key biomarker for noninvasive diagnosis of diabetes,the selective detection of trace acetone in ex-haled gas using a portable and low-cost device remains a great challenge.Semiconductor metal oxide(SMO)based gas sensors have drawn signification attention due to their potential in miniaturization,user-friendliness,high cost-effectiveness and selective real-time detection for noninvasive clinical diag-nosis.Herein,we propose a one-pot solvent evaporation induced tricomponent co-assembly strategy to design a novel ordered mesoporous SMO of silica-implanted WO3(SiO2/WO3)as sensing materials for trace acetone detection.The controlled co-assembly of silicon and tungsten precursors and amphiphilic diblock copolymer poly(ethylene oxide)-block-polystyrene(PEO-b-PS),and the subsequent thermal treat-ment enable the local lattice disorder of WO3 induced by the amorphous silica and the formation of ordered mesoporous SiO2/WO3 hybrid walls with a unique metastable e-phase WO3 framework.The ob-tained mesoporous SiO2/WO3 composites possess highly crystalline framework with large uniform pore size(12.0-13.3 nm),high surface area(99-113 m2/g)and pore volume(0.17-0.23 cm3/g).Typically,the as-fabricated gas sensor based on mesoporous 2.5％SiO2/WO3 exhibits rapid response/recovery rate(5/17 s),superior sensitivity(Rair/Rgas=105 for 50 ppm acetone),as well as high selectivity towards acetone.The limit of detection is as low as 0.25 ppm,which is considerably lower than the thresh value of acetone concentration(＞1.1 ppm)in the exhaled breath of diabetic patients,demonstrating its great prospect in real-time monitoring in diabetes diagnosis.Moreover,the mesoporous 2.5％SiO2/WO3 sensor is integrated into a wireless sensing module connected to a smart phone,providing a convenient real-time detection of acetone.
Department of Chemistry,Shanghai Stomatological Hospital & School of Stomatology,State Key Laboratory of Molecular Engineering of Polymers,Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,iCHEM,Fudan University,Shanghai 200433,China
State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences,Shanghai 200050,China
Frontier Institute of Chip and System,State Key Laboratory of ASIC and System,Fudan University,Shanghai 200433,China
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维普
